U.S. patent application number 16/906415 was filed with the patent office on 2020-10-08 for reactor, motor driver, power conditioner and machine.
This patent application is currently assigned to Fanuc Corporation. The applicant listed for this patent is Fanuc Corporation. Invention is credited to Masatomo Shirouzu, Kenichi Tsukada.
Application Number | 20200321154 16/906415 |
Document ID | / |
Family ID | 1000004905925 |
Filed Date | 2020-10-08 |
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United States Patent
Application |
20200321154 |
Kind Code |
A1 |
Tsukada; Kenichi ; et
al. |
October 8, 2020 |
REACTOR, MOTOR DRIVER, POWER CONDITIONER AND MACHINE
Abstract
A reactor includes an outer peripheral iron core and at least
three iron-core coils that contact or are connected to an inner
surface of the outer peripheral iron core. Each of the iron-core
coils includes iron cores and coils wound onto the iron cores. The
reactor further includes an external cooling unit disposed outside
the outer peripheral iron core, to cool the outer peripheral iron
core.
Inventors: |
Tsukada; Kenichi;
(Yamanashi, JP) ; Shirouzu; Masatomo; (Yamanashi,
JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Fanuc Corporation |
Yamanashi |
|
JP |
|
|
Assignee: |
Fanuc Corporation
Yamanashi
JP
|
Family ID: |
1000004905925 |
Appl. No.: |
16/906415 |
Filed: |
June 19, 2020 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
15890502 |
Feb 7, 2018 |
|
|
|
16906415 |
|
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H01F 27/266 20130101;
H01F 27/263 20130101; H01F 27/2852 20130101; H01F 30/12 20130101;
H01F 27/10 20130101; H01F 37/00 20130101; H01F 3/14 20130101; H01F
30/16 20130101; H01F 2027/328 20130101; H01F 27/105 20130101; H02K
11/33 20160101; H01F 27/306 20130101 |
International
Class: |
H01F 27/10 20060101
H01F027/10; H01F 37/00 20060101 H01F037/00; H02K 11/33 20060101
H02K011/33; H01F 3/14 20060101 H01F003/14; H01F 27/26 20060101
H01F027/26; H01F 27/28 20060101 H01F027/28; H01F 27/30 20060101
H01F027/30; H01F 30/12 20060101 H01F030/12; H01F 30/16 20060101
H01F030/16 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 16, 2017 |
JP |
2017-027150 |
Claims
1. A reactor comprising: an outer peripheral iron core; at least
three iron-core coils contacting or connected to an inner surface
of the outer peripheral iron core, each of the iron-core coils
including iron cores and coils wound onto the iron cores; and an
external cooling unit disposed outside the outer peripheral iron
core, for cooling the outer peripheral iron core; wherein the
external cooling unit includes at least one fin formed on an outer
peripheral surface of the outer peripheral iron core; and wherein
the external cooling unit further includes a jacket for enclosing
the at least one fin.
2. A reactor comprising: an outer peripheral iron core; at least
three iron-core coils contacting or connected to an inner surface
of the outer peripheral iron core, each of the iron-core coils
including iron cores and coils wound onto the iron cores; and an
external cooling unit disposed outside the outer peripheral iron
core, for cooling the outer peripheral iron core; wherein the
external cooling unit includes a fin housing for containing the
outer peripheral iron core, and at least one fin is formed on an
outer peripheral surface of the fin housing; and wherein the
external cooling unit further includes a jacket for enclosing the
at least one fin.
3. A reactor comprising: an outer peripheral iron core; at least
three iron-core coils contacting or connected to an inner surface
of the outer peripheral iron core, each of the iron-core coils
including iron cores and coils wound onto the iron cores; and an
external cooling unit disposed outside the outer peripheral iron
core, for cooling the outer peripheral iron core; wherein the
external cooling unit includes a cylinder made from a wound tube
disposed around the outer peripheral iron core.
4. A reactor comprising: an outer peripheral iron core; at least
three iron-core coils contacting or connected to an inner surface
of the outer peripheral iron core, each of the iron-core coils
including iron cores and coils wound onto the iron cores; and an
external cooling unit disposed outside the outer peripheral iron
core, for cooling the outer peripheral iron core; wherein the
external cooling unit further includes a jacket for enclosing the
outer peripheral iron core; and wherein a plurality of additional
fins or a conduit are formed on an inner peripheral surface of the
jacket.
5. The reactor according to claim 3, wherein the external cooling
unit includes at least one fin formed on an outer peripheral
surface of the outer peripheral iron core.
6. The reactor according to claim 3, wherein the external cooling
unit includes a fin housing for containing the outer peripheral
iron core, and at least one fin is formed on an outer peripheral
surface of the fin housing.
7. The reactor according to claim 5, wherein the external cooling
unit further includes a jacket for enclosing the at least one
fin.
8. The reactor according to claim 7, wherein a conduit is formed on
an inner peripheral surface of the jacket.
9. The reactor according to claim 1, wherein the external cooling
unit includes a cylinder made from a wound tube disposed around the
outer peripheral iron core.
10. The reactor according to claim 7, wherein the external cooling
unit further includes a cooling fan disposed on at least one of an
end face of the jacket and an outer peripheral surface of the
jacket.
11. The reactor according to claim 1, wherein the external cooling
unit includes a housing for sealing the outer peripheral iron core,
and a coolant is injected into the housing.
12. The reactor according to claim 11, wherein an inlet and an
outlet are formed in the housing, and the coolant flows from the
inlet inside the housing to the outlet.
13. The reactor according to claim 1, wherein the number of the
iron-core coils is an integer multiple of 3.
14. The reactor according to claim 1, wherein the number of the
iron-core coils is an even number of 4 or more.
15. A motor driver comprising the reactor according to claim 1.
16. A machine comprising the motor driver according to claim
15.
17. A power conditioner comprising the reactor according to claim
1.
18. A machine comprising the power conditioner according to claim
17.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
[0001] The present invention relates to a reactor, a motor driver,
a power conditioner and a machine.
2. Description of Related Art
[0002] In general, reactors have a plurality of iron cores and a
plurality of coils wound onto the iron cores. In the reactors,
magnetic fluxes leak and pass through the adjoining coils, and thus
generate eddy currents in the coils. As a result, the temperature
of the coils increases.
[0003] Therefore, Japanese Unexamined Patent Publication (Kokai)
No. 2009-49082 discloses that "a reactor circulation path 64 is
connected to the inside of a reactor case 32 for a reactor 30. The
reactor case 32 contains a core 34 and coils 36, which constitute
the reactor 30, and a coolant 66 circulates in the remaining space
inside the container."
SUMMARY OF THE INVENTION
[0004] However, the reactor disclosed in Japanese Unexamined Patent
Publication (Kokai) No. 2009-49082 is contained in the reactor case
in which the coolant circulates, thus causing an increase in
structure size.
[0005] Therefore, it is desired to provide a reactor that can be
efficiently cooled with a simple structure, and a motor driver, a
power conditioner and a machine having such a reactor.
[0006] A first aspect of this disclosure provides a reactor that
includes an outer peripheral iron core; at least three iron-core
coils contacting or connected to an inner surface of the outer
peripheral iron core, each of the iron-core coils including iron
cores and coils wound onto the iron cores; and an external cooling
unit disposed outside the outer peripheral iron core, for cooling
the outer peripheral iron core.
[0007] According to the first aspect, since the external cooling
unit is disposed outside the outer peripheral iron core, the
reactor can be efficiently cooled with a simple structure without
increasing the size of the reactor.
[0008] The above-described and other objects, features and
advantages of the present invention will become more apparent from
the following description of preferred embodiments of the present
invention along with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] FIG. 1 is an end face view of a reactor according to a first
embodiment;
[0010] FIG. 2 is an end face view of a reactor according to a
second embodiment;
[0011] FIG. 3 is a perspective view of a reactor according to a
third embodiment;
[0012] FIG. 4A is a perspective view of a reactor according to a
fourth embodiment;
[0013] FIG. 4B is an exploded perspective view of the reactor shown
in FIG. 4A;
[0014] FIG. 5A is a perspective view of a reactor according to a
fifth embodiment;
[0015] FIG. 5B is a perspective view of another reactor according
to the fifth embodiment;
[0016] FIG. 6A is a perspective view of a reactor according to a
sixth embodiment;
[0017] FIG. 6B is an exploded perspective view of the reactor shown
in FIG. 6A;
[0018] FIG. 7A is a perspective view of a reactor according to a
seventh embodiment;
[0019] FIG. 7B is an exploded perspective view of the reactor shown
in FIG. 7A;
[0020] FIG. 8A is a perspective view of a reactor according to an
eighth embodiment;
[0021] FIG. 8B is another perspective view of the reactor shown in
FIG. 8A;
[0022] FIG. 9A is a perspective view of a reactor according to a
ninth embodiment;
[0023] FIG. 9B is another perspective view of the reactor shown in
FIG. 9A;
[0024] FIG. 10 is a perspective view of a reactor according to a
tenth embodiment;
[0025] FIG. 11 is a perspective view of a reactor according to an
eleventh embodiment; and
[0026] FIG. 12 is a block diagram of a machine having a
reactor.
DETAILED DESCRIPTION
[0027] Embodiments of the present invention will be described below
with reference to the drawings. In the drawings, the same reference
numerals refer to similar components. For ease of understanding,
the drawings are scaled appropriately.
[0028] FIG. 1 is an end face view of a reactor according to a first
embodiment. As shown in FIG. 1, the reactor 5 includes an outer
peripheral iron core 20 having a round cross-section and at least
three iron-core coils 31 to 33 that contact or are connected to an
inner surface of the outer peripheral iron core 20. The number of
the iron-core coils is preferably an integral multiple of 3, and
the reactor 5 can be thereby used as a three-phase reactor. Note
that, the outer peripheral iron core 20 may be polygonal in
shape.
[0029] The iron-core coils 31 to 33 include iron cores 41 to 43 and
coils 51 to 53 wound onto the iron cores 41 to 43, respectively.
Note that, the outer peripheral iron core 20 and the iron cores 41
to 43 are each made by stacking a plurality of iron sheets, carbon
steel sheets or electromagnetic steel sheets or made of a pressed
powder core.
[0030] As is apparent from FIG. 1, the iron cores 41 to 43 have
approximately the same dimensions as each other, and are arranged
at approximately equal intervals in the circumferential direction
of the outer peripheral iron core 20. In FIG. 1, each of the iron
cores 41 to 43 contacts or is connected to the outer peripheral
iron core 20 at its radial outer end portion.
[0031] Furthermore, the iron cores 41 to 43 converge toward the
center of the outer peripheral iron core 20 at their radial inner
end portions each having an edge angle of approximately
120.degree.. The radial inner end portions of the iron cores 41 to
43 are separated from each other by gaps 101 to 103, which can be
magnetically coupled.
[0032] In other words, in the first embodiment, the radial inner
end portion of the iron core 41 is separated from the radial inner
end portions of the adjacent two iron cores 42 and 43 by the gaps
101 and 103, respectively. The same goes for the other iron cores
42 and 43. Note that, the gaps 101 to 103 ideally have the same
dimensions, but may not have the same dimensions. In embodiments
described later, a description regarding the gaps 101 to 103, the
iron-core coils 31 to 33 and the like may be omitted.
[0033] As described above, in the first embodiment, the iron-core
coils 31 to 33 are disposed inside the outer peripheral iron core
20. In other words, the iron-core coils 31 to 33 are enclosed with
the outer peripheral iron core 20. The outer peripheral iron core
20 can reduce leakage of magnetic fluxes generated by the coils 51
to 53 to the outside.
[0034] FIG. 2 is an end face view of a reactor according to a
second embodiment. A reactor 5 shown in FIG. 2 includes an
approximately octagonal outer peripheral iron core 20 and four
iron-core coils 31 to 34 that are magnetically connected to the
outer peripheral iron core 20. The iron-core coils 31 to 34 are
arranged at approximately equal intervals in the circumferential
direction of the reactor 5. The number of the iron-core coils is
preferably an even number of 4 or more, and the reactor 5 can be
thereby used as a single-phase reactor.
[0035] As is apparent from the drawing, the iron-core coils 31 to
34 include iron cores 41 to 44 extending in a radial direction and
coils 51 to 54 wound onto the iron cores 41 to 44, respectively.
Each of the iron cores 41 to 44 contacts the outer peripheral iron
core 20 or is formed integrally with the outer peripheral iron core
20 at its radial outer end portion.
[0036] Furthermore, a radial inner end portion of each of the iron
cores 41 to 44 is disposed in the vicinity of the center of the
outer peripheral iron core 20. In FIG. 2, the iron cores 41 to 44
converge at the center of the outer peripheral iron core 20 at
their radial inner end portions each having an edge angle of
approximately 90.degree.. The radial inner end portions of the iron
cores 41 to 44 are separated from each other by gaps 101 to 104,
which can be magnetically coupled.
[0037] In other words, in the second embodiment, the radial inner
end portion of the iron core 41 is separated from the radial inner
end portions of the adjacent two iron cores 42 and 44 by the gaps
101 and 104, respectively. The same goes for the other iron cores
42 to 44. Note that, the gaps 101 to 104 have approximately the
same dimensions as each other.
[0038] Therefore, a single approximately X-shaped gap, which is
constituted of the gaps 101 to 104, is formed at the center of the
reactor 5. The gaps 101 to 104 are arranged at equal intervals in
the circumferential direction of the reactor 5. According to the
second embodiment, since the outer peripheral iron core 20 encloses
the four iron-core coils 31 to 34, the outer peripheral iron core
20 prevents the leakage of magnetic fields generated by the coils
51 to 54 to the outside.
[0039] Furthermore, in the first embodiment shown in FIG. 1 and the
second embodiment shown in FIG. 2, an external cooling unit 80 is
disposed outside the outer peripheral iron core 20. The external
cooling unit 80 cools the inside of the outer peripheral iron core
20, more specifically, cools the coils 51 to 54. Since the external
cooling unit 80 is disposed around the outer peripheral iron core
20, the reactor 5 can be efficiently cooled with the simple
structure without upsizing, when driving the reactor 5.
[0040] The external cooling unit 80 of the reactor 5 having the
three iron-core coils 31 to 33 will be described below in detail.
FIG. 3 is a perspective view of a reactor according to a third
embodiment. In FIG. 3, the external cooling unit 80 is constituted
of a plurality of fins 81 formed on an outer peripheral surface of
an outer peripheral iron core 20. The fins 81 are formed in a
circumferential direction on the outer peripheral surface of the
outer peripheral iron core 20. However, the fins 81 may be formed
in an axial direction on the outer peripheral surface of the outer
peripheral iron core 20. Other fins may be formed in the axial
direction, as described later. A single helical structure may be
formed as the fins. The same is true in other embodiments described
later.
[0041] In this case, the external cooling unit 80 has an extremely
simple structure. Furthermore, since the fins 81, which constitute
the external cooling unit 80, are integrated into the outer
peripheral iron core 20, another separate member is not required as
the external cooling unit 80, thus preventing an increase in the
size of the reactor 5.
[0042] FIG. 4A is a perspective view of a reactor according to a
fourth embodiment. In FIG. 4A, an outer peripheral iron core 20 is
contained in an approximately cylindrical fin housing 82. The fin
housing 82 is preferably formed of the same material as the outer
peripheral iron core 20. A plurality of fins 83 extending in a
circumferential direction are formed on an outer peripheral surface
of the fin housing 82. In the fourth embodiment, the fin housing 82
and the fins 83 constitute an external cooling unit 80. Note that,
a space may be or may not be formed between the outer peripheral
iron core 20 and the fin housing 82.
[0043] FIG. 4B is an exploded perspective view of the reactor shown
in FIG. 4A. For ease of understanding, FIG. 4B and other drawings
described later omit coils 51 to 53. As shown in FIG. 4B, in the
fourth embodiment, the fin housing 82 having the fins 83 formed
thereon is prepared. The outer peripheral iron core 20 having the
coils 51 to 53 (not illustrated) is inserted into the fin housing
82. In the fourth embodiment, the external cooling unit 80 can be
easily provided for the reactor 5 only by inserting the outer
peripheral iron core 20 into the fin housing 82. Note that, a
plurality of fins 81 may be formed on an outer peripheral surface
of the outer peripheral iron core 20.
[0044] FIG. 5A is a perspective view of a reactor according to a
fifth embodiment. In FIG. 5A, a fin housing 82, on which a
plurality of fins 83 are formed, is disposed around an outer
peripheral iron core 20. The outer peripheral iron core 20 is
inserted into a cylindrical jacket 85, which corresponds to an
external cooling unit 80. The jacket 85 is preferably made of the
same material as the outer peripheral iron core 20. A space is
formed between the jacket 85 and the fin housing 82.
[0045] In general, end plates are fitted on both end portions of
the reactor 5. In the fifth embodiment, the end plates have a
sufficient size to close both end portions of the jacket 85. Thus,
coolant flows through the space between the jacket 85 and the fin
housing 82. This facilitates cooling the reactor 5 more
efficiently. Alternatively, the jacket 85 may have a bottom face or
both of a bottom face and a top face.
[0046] FIG. 5B is a perspective view of another reactor according
to the fifth embodiment. In FIG. 5B, an outer peripheral iron core
20 having a plurality of fins 81 formed on its outer peripheral
surface is inserted into a jacket 85. A space is formed between the
jacket 85 and the outer peripheral iron core 20. In this case,
coolant flows through the space between the jacket 85 and the outer
peripheral iron core 20, in the same manner as described above,
thus cooling the reactor 5 more efficiently.
[0047] FIG. 6A is a perspective view of a reactor according to a
sixth embodiment, and FIG. 6B is an exploded perspective view of
the reactor shown in FIG. 6A. In FIG. 6A, an outer peripheral iron
core 20 is inserted into a jacket 85, as described above. As shown
in FIG. 6B, a plurality of additional fins 84 are formed on an
inner peripheral surface of the jacket 85. Thus, the reactor 5 can
be cooled more efficiently. Alternatively, a conduit 84 may be
formed on the inner peripheral surface of the jacket 85. In this
case, coolant flowing through the conduit 84 inside the jacket 85
enhances the cooling effect.
[0048] FIG. 7A is a perspective view of a reactor according to a
seventh embodiment, and FIG. 7B is an exploded perspective view of
the reactor shown in FIG. 7A. As shown in the drawings, an outer
peripheral iron core 20 is inserted into a cylinder 86, as
described above. The cylinder 86 is made of a wound tube, and has
dimensions so as to contain the outer peripheral iron core 20
therein. The tube is preferably made of a material having a higher
thermal conductivity than a material for the outer peripheral iron
core 20 or is made of a resin. In this case, coolant flowing inside
the cylinder 86 cools the reactor 5 more efficiently.
[0049] FIG. 8A is a perspective view of a reactor according to an
eighth embodiment, and FIG. 8B is another perspective view of the
reactor shown in FIG. 8A. In FIG. 8A, the reactor 5 is disposed
such that its axial direction coincides with the horizontal
direction. In FIG. 8B, the reactor 5 is disposed such that its
axial direction coincides with the vertical direction. In the
drawings, a cooling fan 6 is attached to a bottom face of a jacket
85. The cooling fan 6 is driven by a non-illustrated motor.
[0050] FIG. 9A is a perspective view of a reactor according to a
ninth embodiment, and FIG. 9B is another perspective view of the
reactor shown in FIG. 9A. In the drawings, a cooling fan 6, which
is similar to above, is attached to an outer peripheral surface of
a jacket 85.
[0051] In the eighth and ninth embodiments, when the cooling fan 6
is driven, air flows from the cooling fan 6 through a space between
the outer peripheral iron core 20 and the jacket 85 in the axial
direction or a circumferential direction of the reactor 5.
Therefore, the cooling effect on the reactor 5 is further
enhanced.
[0052] FIG. 10 is a perspective view of a reactor according to a
tenth embodiment. In FIG. 10, an external cooling unit 80 includes
a housing 87 and a lid 88 for closing the top of the housing 87.
The housing 87 contains an outer peripheral iron core 20 having
coils 51 to 53. After or before the outer peripheral iron core 20
is contained, a predetermined amount of coolant is injected into
the housing 87. After the housing 87 is closed with the lid 88, the
reactor 5 is driven. Therefore, the coolant injected into the
housing 87 cools the reactor 5 more efficiently.
[0053] FIG. 11 is a perspective view of a reactor according to an
eleventh embodiment. In FIG. 11, through holes are formed in two
opposite faces of a housing 87, and an inlet 89a and an outlet 89b
are installed on the through holes. An outer peripheral iron core
20 having coils 51 to 53 is disposed in the housing 87, and the
housing 87 is closed with a lid 88. When coolant is supplied from a
non-illustrated cooling device into the inlet 89a, the coolant
flows inside the housing 87 and is ejected from the outlet 89b. In
this case, since the coolant is always supplied in a cooled state,
it is possible to prevent an increase in the temperature of the
coolant owing to the reactor 5, thus cooling the reactor 5 with
extremely high efficiency.
[0054] FIG. 12 is a block diagram of a machine having a reactor. In
FIG. 12, a reactor 5 is used in a motor driver or a power
conditioner. The motor driver or the power conditioner is installed
in the machine. In this case, the motor driver, the power
conditioner, the machine and the like having the reactor can be
easily provided. The scope of the present invention includes
combinations of some of the embodiments described above in an
appropriate manner.
[0055] Aspects of Disclosure
[0056] A first aspect provides a reactor (5) that includes an outer
peripheral iron core (20); at least three iron-core coils (31-34)
contacting or connected to an inner surface of the outer peripheral
iron core, each of the iron-core coils including iron cores (41-44)
and coils (51-54) wound onto the iron cores; and an external
cooling unit (80) disposed outside the outer peripheral iron core,
for cooling the outer peripheral iron core.
[0057] According to a second aspect, in the first aspect, the
external cooling unit includes at least one fin (81) formed on an
outer peripheral surface of the outer peripheral iron core.
[0058] According to a third aspect, in the first or second aspect,
the external cooling unit includes a fin housing for containing the
outer peripheral iron core, and at least one fin is formed on an
outer peripheral surface of the fin housing.
[0059] According to a fourth aspect, in the second or third aspect,
the external cooling unit further includes a jacket (85) for
enclosing the at least one fin.
[0060] According to a fifth aspect, in the fourth aspect, a conduit
(84) is formed on an inner peripheral surface of the jacket.
[0061] According to a sixth aspect, in any of the first to fifth
aspects, the external cooling unit includes a cylinder (86) made
from a wound tube disposed around the outer peripheral iron
core.
[0062] According to a seventh aspect, in the fourth or fifth
aspect, the external cooling unit further includes a cooling fan
(6) disposed on at least one of an end face of the jacket and an
outer peripheral surface of the jacket.
[0063] According to an eighth aspect, in any of the first to
seventh aspects, the external cooling unit includes a housing (87)
for sealing the outer peripheral iron core, and a coolant is
injected into the housing.
[0064] According to a ninth aspect, in the eighth aspect, an inlet
(89a) and an outlet (89b) are formed in the housing, and the
coolant flows from the inlet inside the housing to the outlet.
[0065] According to a tenth aspect, in any of the first to ninth
aspects, the number of the iron-core coils is an integer multiple
of 3.
[0066] According to an eleventh aspect, in any of the first to
ninth aspects, the number of the iron-core coils is an even number
of 4 or more.
[0067] A twelfth aspect provides a motor driver including the
reactor according to any of the first to eleventh aspects.
[0068] A thirteenth aspect provides a machine including the motor
driver according to the twelfth aspect.
[0069] A fourteenth aspect provides a power conditioner including
the reactor according to any of the first to eleventh aspects.
[0070] A fifteenth aspect provides a machine including the power
conditioner according to the fourteenth aspect.
[0071] Effects of Aspects
[0072] According to the first aspect, since the external cooling
unit is disposed outside the outer peripheral iron core, the
reactor can be efficiently cooled with a simple structure.
[0073] The second aspect extremely simplifies the structure of the
external cooling unit, and prevents an increase in the size of the
reactor.
[0074] According to the third aspect, the external cooling unit can
be easily provided for existing reactors, only by inserting the
outer peripheral iron core into the fin housing.
[0075] According to the fourth aspect, the coolant flowing between
the jacket and the fin cools the reactor more efficiently.
[0076] According to the fifth aspect, since the at least one fin is
formed on the inner peripheral surface of the jacket, the reactor
can be cooled more efficiently.
[0077] According to the sixth aspect, the external cooling unit can
be easily provided for the reactor, only by winding the hollow tube
around the outer peripheral iron core.
[0078] According to the seventh aspect, air flowing from the
cooling fan through the inside or outside of the reactor further
enhances the cooling effect.
[0079] According to the eighth aspect, the coolant cools the
reactor more efficiently.
[0080] According to the ninth aspect, the coolant cools the reactor
more efficiently.
[0081] According to the tenth aspect, the reactor can be used as a
three-phase reactor.
[0082] According to the eleventh aspect, the reactor can be used as
a single-phase reactor.
[0083] The twelfth to fifteenth aspects easily provide a motor
driver, a power conditioner and a machine having the reactor.
[0084] The present invention is described above using the preferred
embodiments, but it is apparent for those skilled in the art that
the above-described modifications and other various modifications,
omissions and additions can be made without departing from the
scope of the present invention.
* * * * *