U.S. patent application number 14/083330 was filed with the patent office on 2014-03-20 for vehicle.
This patent application is currently assigned to KABUSHIKI KAISHA YASKAWA DENKI. The applicant listed for this patent is KABUSHIKI KAISHA YASKAWA DENKI. Invention is credited to Yuuto FUKUMA, Takeshi INOUE, Tetsuya ITOU, Toshio NAGAO.
Application Number | 20140077633 14/083330 |
Document ID | / |
Family ID | 43570850 |
Filed Date | 2014-03-20 |
United States Patent
Application |
20140077633 |
Kind Code |
A1 |
NAGAO; Toshio ; et
al. |
March 20, 2014 |
VEHICLE
Abstract
A vehicle includes a motor, a driving device, and a cooling
device. The motor includes a motor main body and a winding
switching unit. The motor main body includes windings and a first
coolant channel to cool said windings. The winding switching unit
is disposed on an outer surface of said motor main body and
includes heat-generating components and a second coolant channel.
The heat-generating components are used to switch said windings.
The second coolant channel is to cool said heat-generating
components. The driving device is configured to control switching
of said winding switching unit and configured to apply driving
voltage to said windings, the drive device including a third
coolant channel. The cooling device is to cool coolant that flows
through said first coolant channel, said second coolant channel and
said third coolant channel.
Inventors: |
NAGAO; Toshio; (Fukuoka,
JP) ; FUKUMA; Yuuto; (Fukuoka, JP) ; INOUE;
Takeshi; (Fukuoka, JP) ; ITOU; Tetsuya;
(Fukuoka, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
KABUSHIKI KAISHA YASKAWA DENKI |
Kitakyushu-shi |
|
JP |
|
|
Assignee: |
KABUSHIKI KAISHA YASKAWA
DENKI
Kitakyushu-shi
JP
|
Family ID: |
43570850 |
Appl. No.: |
14/083330 |
Filed: |
November 18, 2013 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
12986390 |
Jan 7, 2011 |
8614527 |
|
|
14083330 |
|
|
|
|
Current U.S.
Class: |
310/54 |
Current CPC
Class: |
H02K 9/19 20130101; H02K
11/33 20160101; H02K 9/197 20130101; H02K 5/20 20130101 |
Class at
Publication: |
310/54 |
International
Class: |
H02K 9/197 20060101
H02K009/197 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 14, 2010 |
JP |
2010-005413 |
Claims
1. A vehicle comprising: a motor comprising: a motor main body
including windings and a first coolant channel to cool said
windings; and a winding switching unit disposed on an outer surface
of said motor main body and comprising: heat-generating components
used to switch said windings; and a second coolant channel to cool
said heat-generating components; a driving device configured to
control switching of said winding switching unit and configured to
apply driving voltage to said windings, the drive device including
a third coolant channel; and a cooling device to cool coolant that
flows through said first coolant channel, said second coolant
channel and said third coolant channel
2. The vehicle according to claim 1, wherein the coolant cooled by
said cooling device flows through said first coolant channel and
said second coolant channel via said third coolant channel and then
flows into said cooling device again.
3. The vehicle according to claim 1, wherein a part of the coolant
cooled by said cooling device flows into said cooling device again
after flowing through said first coolant channel and said second
coolant channel, and another part of the coolant cooled by said
cooling device flows into said cooling device again after flowing
through said third coolant channel.
4. The vehicle according to claim 1, wherein said motor main body
includes a motor housing inside which said first coolant channel is
formed, and a stator having said windings and fixed to an inner
surface of said motor housing, said winding switching unit includes
a winding switching housing inside which said second coolant
channel is formed and which is disposed on an outer surface of said
motor housing, and said heat-generating components disposed at an
outer surface of said winding switching housing.
5. The vehicle according to claim 4, wherein one end of said first
coolant channel is disposed on the outer surface of said motor
housing, the outer surface of said motor housing facing an exterior
of said motor, one end of said second coolant channel is disposed
on the outer surface of said winding switching housing, the outer
surface of said winding switching housing facing an exterior of
said motor, and another end of said first coolant channel and
another end of said second coolant channel are connected to each
other.
6. The vehicle according to claim 4, wherein said second coolant
channel branches off in an interior of said winding switching
housing, a first end and a second end of said second coolant
channel are disposed on the outer surface of said winding switching
housing, the outer surface of said winding switching housing facing
an exterior of said motor, a third end of said second coolant
channel is disposed on a contact part of said winding switching
housing, the contact part being in contact with said motor housing,
one end of said first coolant channel is disposed on a contact part
of said motor housing, the contact part of said motor housing being
in contact with said winding switching housing and coupled with
said third end of said second coolant channel, and another end of
said first coolant channel is disposed on the outer surface of said
motor housing, the outer surface of said motor housing facing an
exterior of said motor.
7. The vehicle according to claim 4, wherein said first coolant
channel branches off in an interior of said motor housing, a first
end and a second end of said first coolant channel are disposed on
the outer surface of said motor housing, the outer surface of said
motor housing facing an exterior of said motor, a third end of said
first coolant channel is disposed on a contact part of said motor
housing, the contact part of said motor housing being in contact
with said winding switching housing, one end of said second coolant
channel is disposed on the outer surface of said winding switching
housing, the outer surface of said winding switching housing facing
an exterior of said motor, and another end of said second coolant
channel is disposed on a contact part of said winding switching
housing, the contact part of said winding switching housing being
in contact with said motor housing and coupled with said third end
of said first coolant channel
8. The vehicle according to claim 4, wherein one end and another
end of said first coolant channel are disposed on the outer surface
of said motor housing, the outer surface of said motor housing
facing an exterior of said motor, and one end and another end of
said second coolant channel are disposed on the outer surface of
said winding switching housing, the outer surface of said winding
switching housing facing an exterior of said motor.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] The present application a divisional application of the U.S.
patent application Ser. No. 12/986,390 filed Jan. 7, 2011, which
claims priority from Japanese Patent Application No. 2010-005413,
which was filed on Jan. 14, 2010. The disclosures of these
applications are incorporated herein by reference in its
entirety.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to a vehicle.
[0004] 2. Description of the Related Art
[0005] A prior art that has a structure for a motor comprising a
motor main body and a winding switching unit configured to switch
windings of the motor main body, is known. In the prior art, the
winding switching unit is disposed on an outer peripheral surface
of the motor main body (refer to, for example, JP, U,
64-37364).
SUMMARY OF THE INVENTION
[0006] According to one aspect of the present invention, a vehicle
includes a motor, a driving device, and a cooling device. The motor
includes a motor main body and a winding switching unit. The motor
main body includes windings and a first coolant channel to cool
said windings. The winding switching unit is disposed on an outer
surface of said motor main body and includes heat-generating
components and a second coolant channel. The heat-generating
components are used to switch said windings. The second coolant
channel is to cool said heat-generating components. The driving
device is configured to control switching of said winding switching
unit and configured to apply driving voltage to said windings, the
drive device including a third coolant channel. The cooling device
is to cool coolant that flows through said first coolant channel,
said second coolant channel and said third coolant channel
BRIEF DESCRIPTION OF THE DRAWINGS
[0007] FIG. 1 is a diagram illustrating an example of a cooling
system according to embodiment 1 of the present invention.
[0008] FIG. 2 is a perspective view of the motor according to
embodiment 1 of the present invention.
[0009] FIG. 3 is an exploded perspective view of the winding
switching unit 5 of the motor according to embodiment 1 of the
present invention.
[0010] FIG. 4 is a front view of the motor according to embodiment
1 of the present invention.
[0011] FIG. 5 is a cross-sectional view of the motor according to
embodiment 1 of the present invention.
[0012] FIG. 6 is a cross-sectional view of the motor according to
embodiment 2 of the present invention.
[0013] FIG. 7 is a diagram illustrating an example of a cooling
system according to embodiment 3 of the present invention.
[0014] FIG. 8 is a cross-sectional view of the motor according to
embodiment 3 of the present invention.
[0015] FIG. 9 is a cross-sectional view of the motor according to
embodiment 4 of the present invention.
[0016] FIG. 10 is a cross-sectional view of the motor according to
embodiment 5 of the present invention.
[0017] FIG. 11 is a diagram illustrating an example of a cooling
system according to embodiment 6 of the present invention.
[0018] FIG. 12 is a diagram illustrating another example of a
cooling system according to embodiment 6 of the present
invention.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0019] The following describes embodiments of the present invention
with reference to accompanying drawings.
Embodiment 1
[0020] First, an example of a cooling system according to
embodiment 1 of the present invention will be described with
reference to FIG. 1. FIG. 1 is a diagram illustrating an example of
a cooling system according to embodiment 1 of the present
invention.
[0021] In FIG. 1, a cooling system is mounted in a vehicle, and
comprises a radiator 1, a pump 2, an inverter 3, and a motor 4. The
motor 4 comprises a winding switching unit 5 and a motor main body
6. The motor main body 6 comprises windings and a first coolant
channel for cooling the windings. The winding switching unit 5
comprises heat-generating components, including a semiconductor
switching element used to switch the windings of the motor main
body 6, such as a bipolar transistor or IGBT, and a second coolant
channel for cooling the heat-generating components. The winding
switching unit 5 is disposed on an outer surface of the motor main
body 6 and the outer surface located at a side opposite to a load
side (here-in-after, described as "anti-load side") of the motor
main body 6. The inverter 3 is a driving device that comprises a
third coolant channel. The inverter 3 controls the switching of the
winding switching unit 5 in accordance with the driven state of the
motor 4, and applies a driving voltage to the windings of the motor
main body 6. The employed circuit configuration of the windings of
the motor main body 6, the employed circuit configuration of the
winding switching unit 5, and the employed control method of the
inverter 3 are, for example, those disclosed in JP, A, 2003-111492,
and detailed descriptions thereof will be omitted. The radiator 1
is a cooling device that cools a coolant C, such as water. The pump
2 is a device that applies pressure to the coolant C and circulates
the coolant C within the cooling system.
[0022] In FIG. 1, the coolant C cooled in the radiator 1 flows
through the third coolant channel of the inverter 3 via the pump 2,
cooling heat-generating components of the inverter 3. After flowing
through the third coolant channel, the coolant C flows through the
second coolant channel of the winding switching unit 5 and cools
heat-generating components. After flowing through the second
coolant channel, the coolant C flows through the first coolant
channel of the motor main body 6 and cools the windings. After
flowing through the first coolant channel, the coolant C flows into
the radiator 1 once again, and then is cooled by the radiator 1.
The coolant C cooled by the radiator 1 flows through the third
coolant channel of the inverter 3 via the pump 2 once again. The
coolant C is thus circulated within the cooling system via such a
route, cooling the heat-generating components and the windings.
[0023] Next, the specific configuration of the motor 4 according to
this embodiment will be described with reference to FIG. 2 to FIG.
5. FIG. 2 is a perspective view of the motor 4 according to this
embodiment. Reference number O in FIG. 2 denotes the axis of
rotation of a shaft 619. FIG. 3 is an exploded perspective view of
the winding switching unit 5 of the motor 4 according to this
embodiment. FIG. 4 is a front view of the motor 4 according to this
embodiment. FIG. 5 is a cross-sectional view of the motor 4
according to this embodiment, cut along line AOB and viewed from
the direction of the arrow in FIG. 4.
[0024] In FIG. 2 to FIG. 5, the motor 4 comprises the motor main
body 6 and the winding switching unit 5. The motor main body 6
comprises a frame 611, piping members 613 and 614, a stator 615, a
rotor 616, bearings 617 and 618, the shaft 619, a resolver 620, a
bracket 621, and a motor cable 622.
[0025] The frame 611 is substantially cylindrical in shape, with
the open end on the load side closed. The bracket 621 is disposed
on the anti-load side of the frame 611. The frame 611 and the
bracket 621 constitute a motor housing. A first coolant channel 612
is formed in the interior of the frame 611. As illustrated in FIG.
2, the first coolant channel 612 is formed in a zigzag shape across
the outer periphery of the frame 611. As illustrated in FIG. 2 and
FIG. 5, one end and the other end of the first coolant channel 612
are disposed on the outer surface of the frame 611 and the outer
surface faces an exterior of the motor 4. The piping member 613 is
provided on one end of the first coolant channel 612 and the piping
member 614 is provided on the other end of the first coolant
channel 612. A hose 72 connected with the radiator 1 shown in FIG.
1 is provided on the piping member 613. A hose 73 connected with a
second coolant channel 57 of the winding switching unit 5 described
later is provided on the piping member 614.
[0026] The stator 615 comprises windings 615a having the circuit
configuration disclosed in JP, A, 2003-111492, for example. The
windings 615a is provided on a stator core of the stator 615. The
stator 615 is fixed to the inner surface of the frame 611. The
stator 616 is substantially cylindrical in shape. The outer
periphery of the rotor 616 is surrounded by the stator 615, and the
inner periphery of the stator 616 is provided on the outer
periphery of the shaft 619. The rotor 616 rotates by a magnetic
field produced by the windings 615a. The shaft 619 is rotatably
supported by the bearings 617 and 618 with respect to the frame 611
and the bracket 621. The resolver 620 is disposed on the anti-load
side of the shaft 619. The motor cable 622 is provided in a
quantity of three as illustrated in FIG. 2 and FIG. 4, each with
one end connected with the windings 615a and the other end
connected with the inverter 3 shown in FIG. 1.
[0027] In FIG. 2 to FIG. 5, the winding switching unit 5 is
disposed on an outer surface of the motor main body 6 and the outer
surface is located on the anti-load side of the motor main body 6.
The winding switching unit 5 comprises a first housing member 51 as
the second outer surface, a second housing member 52 as the first
outer surface, piping members 53 and 54, a heat-generating
components 55, a cover 56, and a signal wire terminal 58.
[0028] The second housing member 52 is provided on the anti-load
side of the bracket 621. The first housing member 51 is provided on
the anti-load side of the second housing member 52. The first
housing member 51 and the second housing member 52 constitute the
winding switching housing. As illustrated in FIG. 3, a first inner
surface concave portion 51a is formed on a surface 51c on the load
side of the first housing member 51. Holes 51d that extend to the
piping members 53 and 54 are formed on an inner wall of the first
inner surface concave portion 51a. Although not shown in FIG. 3, a
second inner surface concave portion 52a having the same shape as
the first inner surface concave portion 51a is formed on a surface
52c on the anti-load side of the second housing member 52 as well.
The first inner surface concave portion 51a, the holes 51d, and the
second inner surface concave portion 52a form the second coolant
channel 57 in the interior of the winding switching housing wherein
the first housing member 51 and the second housing member 52 come
together, as shown in FIG. 5. Note that, in FIG. 5, the
cross-section of a wall 51e shown in FIG. 3 and a cross-section of
a wall on the side of the second housing member 52 corresponding to
the wall 51e are omitted for ease of explanation. As illustrated in
FIG. 3 and FIG. 5, one end and the other end of the second coolant
channel 57 are disposed on the outer surface of the first housing
member 51 and the outer surface faces an exterior of the motor 4.
The piping member 53 is provided on one end of the second coolant
channel 57 and the piping member 54 is provided on the other end of
the second coolant channel 57. A hose 71 that connects with the
third coolant channel of the inverter 3 shown in FIG. 1 is provided
on the piping member 53. The hose 73 connected with the other end
of the first coolant channel 612 of the motor main body 6 is
provided on the piping member 54.
[0029] As illustrated in FIG. 3 and FIG. 5, a first outer surface
concave portion 51b is formed on a surface on the anti-load side of
the first housing member 51, and a second outer surface concave
portion 52b is formed on a surface on the load side of the second
housing member 52. The heat-generating components 55, which is a
semiconductor switch element used for switching the windings 615a,
such as a bipolar transistor, IGBT, etc., is in close contact with
the first outer surface concave portion 51b and the second outer
surface concave portion 52b. The cover 56 that covers the first
outer surface concave portion 51b is provided on a surface on the
anti-load side of the first housing member 51. The signal wire
terminal 58 for inputting a control signal from the inverter 3 is
provided on the first housing member 51.
[0030] Next, the flow of the coolant C within the motor 4
configured as described above will be described with reference to
FIG. 5. After flowing through the third coolant channel of the
inverter 3, the coolant C flows through the second coolant channel
57 of the winding switching unit 5 via the hose 71 and the piping
member 53. With this arrangement, the heat-generating components 55
are cooled, further suppressing the ambient temperature within the
winding switching unit 5. After flowing through the second coolant
channel 57, the coolant C flows through the first coolant channel
612 of the motor main body 6 via the piping member 54, the hose 73,
and the piping member 614. With this arrangement, the windings 615a
are cooled via the frame 611. After flowing through the first
coolant channel 612, the coolant C flows out to the radiator 1 via
the piping member 613 and the hose 72.
[0031] In general, in a motor comprising the motor main body and
the winding switching unit as described above, the motor main body
and the winding switching unit both generate heat. Therefore, the
motor main body and the winding switching unit are preferably
cooled in a highly efficient manner. Nevertheless, in the prior
art, the motor main body and the winding switching unit are merely
naturally cooled by natural air cooling, and not cooled with high
efficiency.
[0032] As described above, in this embodiment, the motor main body
6 and the winding switching unit 5 are cooled by the coolant C. As
a result, it is possible to cool the motor main body 6 and the
winding switching unit 5 more efficiently than prior art.
[0033] Additionally, in this embodiment, the winding switching unit
5 is disposed on the outer face located on the anti-load side of
the motor main body 6. The load side of the motor main body 6 is
often installed to the chassis, etc., of a vehicle. Thus, by
providing the winding switching unit 5 on the outer face located on
the anti-load side of the motor main body 6, the cover 56 can be
easily opened to maintain and inspect the winding switching unit
5.
[0034] Additionally, according to this embodiment, the coolant C
flows through the second coolant channel 57 of the winding
switching unit 5 and then through the first coolant channel 612 of
the motor main body 6. Generally, the maximum temperature of the
windings 615a of the motor main body 6 is higher than the maximum
temperature of the heat-generating components 55 of the winding
switching unit 5. Thus, with the coolant C flowing first through
the second coolant channel 57, the temperature rise of the coolant
C is further suppressed than a case where the coolant C flows first
through the first coolant channel 612. As a result, it is possible
to cool the heat-generating components 55 of the winding switching
unit 5 more efficiently.
[0035] Note that while the winding switching unit 5 is disposed at
the outer surface on the anti-load side of the motor main body 6 in
the above, the present invention is not limited thereto. That is,
the winding switching unit 5 may be disposed at the outer surface
on the load side of the motor main body 6 or at the outer
peripheral surface of the motor main body 6.
[0036] Additionally, while the motor housing comprises the frame
611 and the bracket 621 in the above, the present invention is not
limited thereto. For example, the motor housing may be a housing
wherein the frame 611 and the bracket 621 are integrated.
Additionally, the frame 611 may be substantially cylindrical in
shape, with the load side open, and a load side bracket may be
further provided on the load side of the frame 611. Then, the motor
housing may comprise this load side bracket, the frame 611, and the
bracket 621.
[0037] Additionally, while the coolant C flows through the second
coolant channel 57 of the winding switching unit 5 and then through
the first coolant channel 612 of the motor main body 6 in the
above, the present invention is not limited thereto. In a case
where the motor main body 6 is used within a range in which the
temperature of the windings 615a does not increase beyond the
temperature of the heat-generating components of the winding
switching unit 5, the coolant C may first flow through the first
coolant channel 612. With this arrangement, it is possible to cool
the windings 615a of the motor main body 6 more efficiently.
Embodiment 2
[0038] The configuration of the motor according to embodiment 2 of
the present invention will now be described with reference to FIG.
6. FIG. 6 is a cross-sectional view of the motor according to
embodiment 2 of the present invention. Reference number O in FIG. 6
denotes the axis of rotation of the shaft 619. In FIG. 6, the
components identical to those in embodiment 1 shown in FIG. 5 are
denoted using the same reference numerals as those in FIG. 5. The
cooling system according to this embodiment is the same as the
cooling system according to embodiment 1 shown in FIG. 1, and
descriptions thereof will be omitted. The motor according to this
embodiment differs from the motor 4 according to embodiment 1 in
that the heat-generating components 55 and all other components of
the winding switching unit 5 are provided only on the side opposite
the motor main body 6 from the second coolant channel 57, and the
other end of the second coolant channel 57 of the winding switching
unit 5 is directly joined to the other end of the first coolant
channel 612 of the motor main body 6. The description that follows
will focus on these differences.
[0039] In FIG. 6, a motor 4a according to this embodiment comprises
a winding switching unit 5a and a motor main body 6a. The motor
main body 6a comprises the frame 611, the piping member 613, the
stator 615, the rotor 616, the bearings 617 and 618, the shaft 619,
the resolver 620, the bracket 621, and the motor cable 622.
[0040] A hole 621a is formed on the bracket 621. The hole 621a
constitutes a part of the first coolant channel 612 formed in the
interior of the frame 611. One end of the first coolant channel 612
is disposed on the outer surface of the frame 611 and the outer
surface faces the exterior of the motor 4a. The piping member 613
is provided on one end of the first coolant channel 612, and the
hose 72 connected with the radiator 1 shown in FIG. 1 is provided
on the piping member 613. The other end of the first coolant
channel 612 is disposed on a contact part of the bracket 621 and
the contact part is in contact with the winding switching unit 5a.
The other end of the first coolant channel 612 is directly coupled
with the other end of the second coolant channel 57 of the winding
switching unit 5a described later.
[0041] In FIG. 6, the winding switching unit 5a is provided on the
outer surface of the motor main body 6a and the outer surface is
located on the anti-load side of the motor main body 6a. The
winding switching unit 5a comprises the first housing member 51, a
second housing member 521, the piping member 53, the
heat-generating components 55, the cover 56, and the signal wire
terminal 58.
[0042] The second housing member 521 is a sheet-shaped member
having a hole 521a, and is provided on the anti-load side of the
bracket 621. The first housing member 51 is provided on the
anti-load side of the second housing member 521. The first housing
member 51 and the second housing member 521 constitute the winding
switching housing. The first inner surface concave portion 51a is
formed on a side located at the load side of the first housing
member 51. The hole 51d that extends to the piping member 53 and a
hole 51f that extends to the hole 521a of second housing member 521
are formed on the inner wall of the first inner surface concave
portion 51a. The first inner surface concave portion 51a, the hole
51d, the hole 51f, and the hole 521a form the second coolant
channel 57 in the interior of the winding switching housing that is
formed by combining the first housing member 51 and the second
housing member 521. One end of the second coolant channel 57 is
disposed on the outer surface of the first housing member 51 and
the outer surface faces the exterior of the motor 4a. The piping
member 53 is provided on one end of the second coolant channel 57,
and the hose 71 connected with the third coolant channel of the
inverter 3 shown in FIG. 1 is provided on the piping member 53. The
other end of the second coolant channel 57 is disposed on a contact
part of the second housing member 521 and the contact part is in
contact with the bracket 621 of the motor main body 6. The other
end of the second coolant channel 57 is directly coupled with the
other end of the first coolant channel 612 of the motor main body
6a. The heat-generating components 55 and all other components of
the winding switching unit 5a are in close contact with the first
outer surface concave portion 51b of the first housing member
51.
[0043] Next, the flow of the coolant C within the motor 4a
configured as described above will be described with reference to
FIG. 6. After flowing through the third coolant channel of the
inverter 3, the coolant C flows through the second coolant channel
57 of the winding switching unit 5a via the hose 71 and the piping
member 53. With this arrangement, the heat-generating components 55
is cooled, further suppressing the ambient temperature within the
winding switching unit 5a. After flowing through the second coolant
channel 57, the coolant C flows through the first coolant channel
612 of the motor main body 6 without passing through a hose or
piping member. With this arrangement, the windings 615a are cooled
via the frame 611. After flowing through the first coolant channel
612, the coolant C flows out to the radiator 1 via the piping
member 613 and the hose 72.
[0044] As described above, in this embodiment, the heat-generating
components 55 and all other components of the winding switching
unit 5a are provided on the side opposite the motor main body 6a
from the second coolant channel 57. As a result, the heat
transmitted from the motor main body 6a to the components of the
winding switching unit 5a is blocked by the second coolant channel
57, making it possible to alleviate the effect of the heat from the
motor main body 6a. The effect is received by the components of the
winding switching unit 5a. Furthermore, such a design further
simplifies the structure of the second housing member 521 than the
structure of the second housing member 52 of embodiment 1, making
it possible to reduce the size of the winding switching unit
5a.
[0045] Further, in this embodiment, the other end of the second
coolant channel 57 of the winding switching unit 5a is directly
coupled with the other end of the first coolant channel 612 of the
motor main body 6. As a result, the piping members 614 and 54 and
the hose 73 shown in embodiment 1 can be eliminated, making it
possible achieve reductions in price and weight.
[0046] Note that while in the above both a structure wherein the
heat-generating components 55 and all other components of the
winding switching unit 5a are provided on the side opposite the
motor main body 6a from the second coolant channel 57, and a
structure wherein the other end of the second coolant channel 57 of
the winding switching unit 5a is directly coupled with the other
end of the first coolant channel 612 of the motor main body 6a are
applied, either one of these structures may be applied alone.
Embodiment 3
[0047] An example of a cooling system according to embodiment 3 of
the present invention will now be described with reference to FIG.
7. FIG. 7 is a diagram illustrating an example of a cooling system
according to embodiment 3 of the present invention. In FIG. 7, the
components identical to those in embodiment 1 shown in FIG. 1 are
denoted using the same reference numerals as those in FIG. 1. The
cooling system according to this embodiment differs from the
cooling system according to embodiment 1 in that the coolant C
flows in parallel to the winding switching unit 5 and the motor
main body 6. The description that follows will focus on this
difference.
[0048] In FIG. 7, the cooling system is mounted in a vehicle, and
comprises the radiator 1, the pump 2, the inventor 3, and a motor
4b. The motor 4b comprises a winding switching unit 5b and a motor
main body 6b. The motor main body 6b comprises windings and a first
coolant channel for cooling the windings. The winding switching
unit 5b comprises heat-generating components used for switching the
windings of the motor main body 6b, and a second coolant channel
for cooling the heat-generating components. The winding switching
unit 5b is disposed at the outer surface of the motor main body 6b
and the outer surface is located on the anti-load side surface of
the motor main body 6b. The employed circuit configuration of the
windings of the motor main body 6b, the employed circuit
configuration of the winding switching unit 5b, and the employed
control method of the inverter 3 are, for example, those disclosed
in JP, A, 2003-111492, and detailed descriptions thereof will be
omitted.
[0049] In FIG. 7, the coolant C cooled in the radiator 1 flows
through the third coolant channel of the inverter 3 via the pump 2,
cooling the heat-generating components of the inverter 3. After
flowing through the third coolant channel, the coolant C flows in
parallel through the second coolant channel of the winding
switching unit 5b and the first coolant channel of the motor main
body 6b, respectively cooling the heat-generating components of the
winding switching unit 5b and the windings of the motor main body
6b. After flowing through the first coolant channel and the second
coolant channel, the coolant C flows into the radiator 1 once
again, where it is cooled by the radiator 1. The coolant C cooled
by the radiator 1 flows through the third coolant channel of the
inverter 3 via the pump 2 once again. The coolant C is thus
circulated within the cooling system via such a route, cooling the
heat-generating components and the windings.
[0050] Next, the specific configuration of the motor 4b according
to this embodiment will be described with reference to FIG. 8. FIG.
8 is a cross-sectional view of the motor 4b according to this
embodiment. Reference number O in FIG. 8 denotes the axis of
rotation of the shaft 619. In FIG. 8, the components identical to
those in embodiment 1 shown in FIG. 5 are denoted using the same
reference numerals as those in FIG. 5. The motor 4b according to
this embodiment differs from the motor 4 according to embodiment 1
in that the second coolant channel 57 branches off inside the
winding switching unit 5, and the branched second coolant channel
57 is coupled with the first coolant channel 612 of the motor main
body 6. The description that follows will focus on these
differences.
[0051] In FIG. 8, the motor main body 6b comprises the frame 611,
the piping member 614, the stator 615, the rotor 616, the bearings
617 and 618, the shaft 619, the resolver 620, the bracket 621, and
the motor cable 622.
[0052] A hole 621b is formed on the bracket 621. The hole 621b
makes up a part of the first coolant channel 612 formed in the
interior of the frame 611. One end of the first coolant channel 612
is disposed on a contact part of the bracket 621 and the contact
part is in contact with the winding switching unit 5b. The one end
of the first coolant channel 612 is directly coupled with the
branched end of the second coolant channel 57 of the winding
switching unit 5b described later. The other end of the first
coolant channel 612 is disposed on the outer surface of the frame
611 and the outer surface faces the exterior of the motor 4b. The
piping member 614 is provided on the other end of the first coolant
channel 612, and a hose 75 connected with the radiator 1 shown in
FIG. 7 is provided on the piping member 614.
[0053] In FIG. 8, the winding switching unit 5b is disposed on the
outer surface of the motor main body 6b and the outer surface is
located on the anti-load side of the motor main body 6b. The
winding switching unit 5b comprises the first housing member 51,
the second housing member 52, the piping members 53 and 54, the
heat-generating components 55, the cover 56, and the signal wire
terminal 58.
[0054] A hole 52g that joins one end of the first coolant channel
612 of the motor main body 6b is formed on the second housing
member 52. Holes 51d that extend to the piping members 53 and 54
are formed on an inner wall of the first inner surface concave
portion 51a. Furthermore, a branch portion 51g is formed at the
hole 51d that extends to the piping member 53. The branched end
that branches from the hole 51d by the branch portion 51g is
coupled with the hole 52g of the second housing member 52. The
first inner surface concave portion 51a, the hole 51d, the hole
52g, and the second inner surface concave portion 52a form the
second coolant channel 57 that is branched by the branch portion
51g in the interior of the winding switching housing that is formed
by combining the first housing member 51 and the second housing
member 52. A first end as one end of the second coolant channel 57
and a second end as the other end of the second coolant channel 57
are disposed on the outer surface of the first housing member 51
and the outer surface faces the exterior of the motor 4b. The
piping member 53 is provided on the first end of the second coolant
channel 57, and the piping member 54 is provided on the second end
of the second coolant channel 57. The hose 71 that connects with
the third coolant channel of the inverter 3 shown in FIG. 7 is
provided on the piping member 53. A hose 74 connected with the
radiator 1 shown in FIG. 7 is provided on the piping member 54. A
third end of the second coolant channel 57 as a branched end that
is branched by the branch portion 51g, is disposed at a contact
part of the second housing member 52 and the contact part is in
contact with the bracket 621. The third end of the second coolant
channel 57 is connected with one end of the first coolant channel
612.
[0055] Next, the flow of the coolant C within the motor 4b
configured as described above will be described with reference to
FIG. 8. After flowing through the third coolant channel of the
inverter 3, the coolant C simultaneously flows through the second
coolant channel 57 of the winding switching unit 5b via the hose 71
and the piping member 53, and flows through the first coolant
channel 612 of the motor main body 6b. With this arrangement, the
heat-generating components 55 of the winding switching unit 5b and
the windings 615a of the motor main body 6b are cooled. After
flowing through the second coolant channel 57, the coolant C flows
out to the radiator 1 via the piping member 54 and the hose 74.
After flowing through the first coolant channel 612, the coolant C
flows out to the radiator 1 via the piping member 614 and the hose
75.
[0056] As described above, in this embodiment, the coolant C flows
in parallel to the winding switching unit 5b and the motor main
body 6b. As a result, the rise in temperature of the coolant C
caused by the winding switching unit 5b does not affect the motor
main body 6b, nor does the rise in temperature of the coolant C
caused by the motor main body 6b affect the winding switching unit
5b, as was the case in embodiment 1. As a result, it is possible to
cool the motor main body 6b and the winding switching unit 5b more
efficiently.
[0057] Further, according to this embodiment, the second coolant
channel 57 is branched off in the interior of the winding switching
unit 5b, and the branched second coolant channel 57 and the first
coolant channel 612 of the motor main body 6b are joined together.
As a result, the piping member 613 shown in embodiment 1 can be
eliminated, making it possible achieve reductions in price and
weight.
[0058] Note that while in the above the coolant C flows into the
hose 71 and flows out from the hoses 74 and 75, the present
invention is not limited thereto. The coolant C may flow into the
hoses 74 and 75 and flows out from the hose 71. In such a case, the
hoses 74 and 75 are connected with the third coolant channel of the
inverter 3 shown in FIG. 7, and the hose 71 is connected with the
radiator 1.
[0059] Further, while in the above the heat-generating components
55 of the winding switching unit 5b is provided on the first outer
surface concave portion 51b and the second outer surface concave
portion 52b in the same manner as embodiment 1, the present
invention is not limited thereto. As in embodiment 2, a structure
wherein the heat-generating components 55 and all other components
of the winding switching unit 5b are provided on only the side
opposite the motor main body 6b from the second coolant channel 57
(on only the first outer surface concave portion 51b) may be
applied to the motor 4b of this embodiment.
Embodiment 4
[0060] The configuration of the motor according to embodiment 4 of
the present invention will now be described with reference to FIG.
9. FIG. 9 is a cross-sectional view of the motor according to
embodiment 4. Reference number O in FIG. 9 denotes the axis of
rotation of the shaft 619. In FIG. 9, the components identical to
those in embodiment 1 shown in FIG. 1 are denoted using the same
reference numerals as those in FIG. 1. In the cooling system
according to this embodiment, the coolant C flows in parallel to
the winding switching unit and the motor main body similar to the
cooling system according to embodiment 3 shown in FIG. 7, and
descriptions thereof will be omitted. The motor according to this
embodiment differs from the motor 4 according to embodiment 1 in
that the first coolant channel 612 branches off in the interior of
the motor main body 6, and the branched first coolant channel 612
and the second coolant channel 57 of the winding switching unit 5
are joined together. The description that follows will focus on
these differences.
[0061] In FIG. 9, a motor 4c comprises a winding switching unit 5c
and a motor main body 6c. The motor main body 6c comprises the
frame 611, the piping members 613 and 614, the stator 615, the
rotor 616, the bearings 617 and 618, the shaft 619, the resolver
620, the bracket 621, and the motor cable 622.
[0062] A first end as one end of the first coolant channel 612 and
a second end as the other end of the first coolant channel 612 are
provided on the outer surface of the frame 611 and the outer
surface faces the exterior of the motor 4c. The piping member 613
is provided on the first end of the first coolant channel 612, and
the hose 72 connected with the third coolant channel of the
inverter 3 shown in FIG. 7 is provided on the piping member 613.
The piping member 614 is provided on the second end of the first
coolant channel 612, and the hose 75 connected with the radiator 1
shown in FIG. 7 is provided on the piping member 614. A branch
portion 611a is formed in the interior of the frame 611 in the
first coolant channel 612. The branched end that is branched by the
branch portion 611a is coupled with a hole 621c formed on the
bracket 621. The hole 621c is a part of the first coolant channel
612, and a third end as branched end of the first coolant channel
612 branched by the branch portion 611a is disposed on at a contact
part of the bracket 621 and the contact part is in contact with the
second housing member 52.
[0063] In FIG. 9, the winding switching unit 5c is disposed on the
outer surface of the motor main body 6c and the outer surface is
located on the anti-load side of the motor main body 6c. and
comprises the first housing member 51, the second housing member
52, the piping member 53, the heat-generating components 55, the
cover 56, and the signal wire terminal 58.
[0064] A hole 52h that is coupled with the third end of the first
coolant channel 612 of the motor main body 6c is formed on the
second housing member 52. The hole 51d that extends to the piping
member 53 and a hole 51h that extends to the hole 52h of the second
housing member 52 are formed on the inner wall of the first inner
surface concave portion 51a. The first inner surface concave
portion 51a, the hole 51d, the hole 51h, the hole 52h, and the
second inner surface concave portion 52a form the second coolant
channel 57 in the interior of the winding switching housing that is
formed by combining the first housing member 51 and the second
housing member 52. One end of the second coolant channel 57 is
disposed on the outer surface of the first housing member 51 and
the outer surface faces the exterior of the motor 4c. The piping
member 53 is provided on one end of the second coolant channel 57,
and the hose 71 connected with the third coolant channel of the
inverter 3 shown in FIG. 7 is provided on the piping member 53. The
other end of the second coolant channel 57 is disposed at a
contacting part of the second housing member 52 and the contacting
part is in contact with the bracket 621. The other end of the
second coolant channel 57 is coupled with the third end of the
first coolant channel 612.
[0065] Next, the flow of the coolant C within the motor 4c
configured as described above will be described with reference to
FIG. 9. After flowing through the third coolant channel of the
inverter 3, the coolant C simultaneously flows through the second
coolant channel 57 of the winding switching unit 5c via the hose 71
and the piping member 53, and flows through the first coolant
channel 612 of the motor main body 6c via the hose 72 and the
piping member 613. With this arrangement, the heat-generating
components 55 of the winding switching unit 5c and the windings
615a of the motor main body 6c are cooled. The coolant C flowed
through the second coolant channel 57 and the coolant C flowed
through the first coolant channel 612 flow out to the radiator 1
via the piping member 614 and the hose 75.
[0066] As described above, in this embodiment, the coolant C flows
in parallel to the winding switching unit 5c and the motor main
body 6c. As a result, the rise in temperature of the coolant C
caused by the winding switching unit 5c does not affect the motor
main body 6c, nor does the rise in temperature of the coolant C
caused by the motor main body 6c affect the winding switching unit
5c, as was the case in embodiment 1. As a result, it is possible to
cool the motor main body 6c and the winding switching unit 5c more
efficiently.
[0067] Further, in this embodiment, the first coolant channel 612
is branched in the interior of the motor main body 6c, and the
branched first coolant channel 612 and the second coolant channel
57 of the winding switching unit 5c are joined together. As a
result, the piping member 54 shown in embodiment 1 can be
eliminated, making it possible achieve reductions in price and
weight.
[0068] Note that while in the above the coolant C flows into the
hose 71 and the hose 72 and flows out from the hose 75, the present
invention is not limited thereto. The coolant C may flow into the
hose 75 and flows out from the hose 71 and the hose 72. In such a
case, the hose 75 is connected with the third coolant channel of
the inverter 3 shown in FIG. 7, and the hoses 71 and 72 are
connected with the radiator 1.
[0069] Further, while in the above the heat-generating components
55 of the winding switching unit 5c is provided on the first outer
surface concave portion 51b and the second outer surface concave
portion 52b similar to embodiment 1, the present invention is not
limited thereto. As in embodiment 2, a structure wherein the
heat-generating components 55 and all other components of the
winding switching unit 5c are provided on only the side opposite
the motor main body 6c from the second coolant channel 57 (on only
the first outer surface concave portion 51b) may be applied to the
motor 4c of this embodiment.
Embodiment 5
[0070] The configuration of the motor according to embodiment 5 of
the present invention will now be described with reference to FIG.
10. FIG. 10 is a cross-sectional view of the motor according to
embodiment 5. Reference number O in FIG. 10 denotes the axis of
rotation of the shaft 619. In FIG. 10, the components identical to
those in embodiment 1 shown in FIG. 1 are denoted using the same
reference numerals as those in FIG. 1. In the cooling system
according to this embodiment, the coolant C flows in parallel to
the winding switching unit and the motor main body similar to the
cooling system according to embodiment 3 shown in FIG. 7, and
descriptions thereof will be omitted. The motor according to this
embodiment differs from the motor 4 according to embodiment 1 in
that the other end of the first coolant channel 612 of the motor
main body 6 and the other end of the second coolant channel 57 of
the winding switching unit 5 are not joined together. The
description that follows will focus on this difference.
[0071] In FIG. 10, a motor 4d comprises a winding switching unit 5d
and a motor main body 6d. The motor main body 6d comprises the
frame 611, the piping members 613 and 614, the stator 615, the
rotor 616, the bearings 617 and 618, the shaft 619, the resolver
620, the bracket 621, and the motor cable 622.
[0072] One end and the other end of the first coolant channel 612
are disposed on the outer surface of the frame 611 and the outer
surface faces the exterior of the motor 4d. The piping member 613
is provided on one end and the piping member 614 is provided on the
other end of the first coolant channel 612. The hose 72 connected
with the third coolant channel of the inverter 3 shown in FIG. 7 is
provided on the piping member 613, and the hose 75 connected with
the radiator 1 shown in FIG. 7 is provided on the piping member
614.
[0073] In FIG. 10, the winding switching unit 5d is disposed on the
outer surface of the motor main body 6d and the outer surface is
located at the anti-load side of the motor main body 6d. The
winding switching unit 5d comprises the first housing member 51,
the second housing member 52, the piping members 53 and 54, the
heat-generating components 55, the cover 56, and the signal wire
terminal 58.
[0074] The one end and the other end of the second coolant channel
57 are disposed on the outer surface of the first housing member 51
and the outer surface faces exterior of the motor 4d. The piping
member 53 is provided on one end of the second coolant channel 57
and the piping member 54 is provided on the other end of the second
coolant channel 57. The hose 71 connected with the third coolant
channel of the inverter 3 shown in FIG. 7 is provided on the piping
member 53, and the hose 74 connected with the radiator 1 shown in
FIG. 7 is provided on the piping member 54.
[0075] Next, the flow of the coolant C in the motor 4d configured
as described above will be described with reference to FIG. 10.
After flowing through the third coolant channel of the inverter 3,
the coolant C simultaneously flows through the second coolant
channel 57 of the winding switching unit 5d via the hose 71 and the
piping member 53, and flows through the first coolant channel 612
of the motor main body 6d via the hose 72 and the piping member
613. With this arrangement, the heat-generating components 55 of
the winding switching unit 5d and the windings 615a of the motor
main body 6d are cooled. After flowing through the second coolant
channel 57, the coolant C flows out to the radiator 1 via the
piping member 54 and the hose 74. After flowing through the first
coolant channel 612, the coolant C flows out to the radiator 1 via
the piping member 614 and the hose 75.
[0076] As described above, in this embodiment, the coolant C flows
in parallel to the winding switching unit 5d and the motor main
body 6d. As a result, the rise in temperature of the coolant C
caused by the winding switching unit 5d does not affect the motor
main body 6d, nor does the rise in temperature of the coolant C
caused by the motor main body 6d affect the winding switching unit
5d, as was the case in embodiment 1. As a result, it is possible to
cool the motor main body 6d and the winding switching unit 5d more
efficiently.
[0077] Note that while in the above the coolant C flows into the
hose 71 and the hose 72 and flows out from the hoses 74 and 75, the
present invention is not limited thereto. The coolant C may flow
into the hoses 74 and 75 and flows out from the hose 71 and the
hose 72. In such a case, the hoses 74 and 75 are connected with the
third coolant channel of the inverter 3 shown in FIG. 7, and the
hoses 71 and 72 are connected with the radiator 1.
[0078] Further, while in the above the heat-generating components
55 of the winding switching unit 5d is provided on the first outer
surface concave portion 51b and the second outer surface concave
portion 52b similar to embodiment 1, the present invention is not
limited thereto. As in embodiment 2, a structure wherein the
heat-generating components 55 and all other components of the
winding switching unit 5d are provided on only the side opposite
the motor main body 6d from the second coolant channel 57 (on only
the first outer surface concave portion 51b) may be applied to the
motor 4d of this embodiment.
Embodiment 6
[0079] An example of a cooling system according to embodiment 6 of
the present invention will now be described with reference to FIG.
11. FIG. 11 is a diagram illustrating an example of a cooling
system according to embodiment 6 of the present invention. In FIG.
11, the components identical to those in embodiment 1 shown in FIG.
1 are denoted using the same reference numerals as those in FIG. 1.
The cooling system according to the embodiment differs from the
cooling system according to embodiment 1 in that the coolant C that
flows to the inverter 3 and the coolant C that flows to the motor 4
are separately cooled by the radiator 1. The description that
follows will focus on this difference.
[0080] In FIG. 11, a cooling system is mounted in a vehicle, and
comprises the radiator 1, the pumps 2 and 8, the inventor 3, and
the motor 4. The motor 4 is a motor according to embodiment 1, for
example, and comprises the winding switching unit 5 and the motor
main body 6.
[0081] In FIG. 11, a portion of the coolant C cooled by the
radiator 1 flows through the second coolant channel of the winding
switching unit 5 and through the first coolant channel of the motor
main body 6 via the pump 2, cooling the heat-generating components
of the winding switching unit 5 and the windings of the motor main
body 6, respectively. After flowing through the first coolant
channel and the second coolant channel, the coolant C flows into
the radiator 1 once again, where it is cooled by the radiator 1. A
part of the coolant C cooled by the radiator 1 flows through the
second coolant channel of the winding switching unit 5 and the
first coolant channel of the motor main body 6 via the pump 2 once
again. The other part of the coolant C cooled by the radiator 1
flows through the third coolant channel of the inverter 3 via a
pump 8, cooling the heat-generating components of the inverter 3.
After flowing through the third coolant channel, the coolant C
flows into the radiator 1 once again, where it is cooled by the
radiator 1. The other portion of the coolant C cooled by the
radiator 1 flows through the third coolant channel of the inverter
3 via the pump 8 once again. The coolant C is thus circulated
within the cooling system via such a route, cooling the
heat-generating components and the windings.
[0082] As described above, in this embodiment, the coolant C that
flows to the inverter 3 and the coolant C that flows to the motor 4
are separately cooled by the radiator 1. As a result, the cooling
process is completed without the rise in temperature of the coolant
C caused by the inverter 3 affecting the coolant C that flows to
the winding switching unit 5 and the motor main body 6. As a
result, it is possible to cool the winding switching unit 5 and the
motor main body 6 more efficiently.
[0083] Note that while the above has described an illustrative
scenario in which the motor 4 according to embodiment 1 is employed
as the motor, i.e., the first coolant channel 612 and the second
coolant channel 57 are serially connected, the present invention is
not limited thereto. As shown in FIG. 12, a case where the first
coolant channel 612 and the second coolant channel 57 are connected
in parallel, such as with the motor 4b according to embodiment 3,
is acceptable. FIG. 12 is a diagram illustrating another example of
a cooling system according to embodiment 6.
[0084] In the foregoing specification, the invention has been
described with reference to specific embodiments. However, one of
ordinary skill in the art appreciates that various modifications
and changes can be made without departing from the scope of the
invention as set forth in the claims Accordingly, all such
modifications are intended to be included within the scope of the
invention.
* * * * *