U.S. patent application number 10/849226 was filed with the patent office on 2005-08-18 for motor for electric power steering apparatus.
This patent application is currently assigned to MITSUBISHI DENKI KABUSHIKI KAISHA. Invention is credited to Akutsu, Satoru, Hemmi, Shinsuke, Okazaki, Masafumi.
Application Number | 20050179329 10/849226 |
Document ID | / |
Family ID | 34805944 |
Filed Date | 2005-08-18 |
United States Patent
Application |
20050179329 |
Kind Code |
A1 |
Okazaki, Masafumi ; et
al. |
August 18, 2005 |
MOTOR FOR ELECTRIC POWER STEERING APPARATUS
Abstract
A motor for an electric power steering apparatus can improve
working efficiency, and can be reassembled without requiring any
new or additional members. A bracket is disposed at an opening of a
cylindrical bottomed frame. A stator with a stator winding is fixed
to the frame around a rotor. Stator-side terminals each having a
connection portion extending toward the bracket are disposed
between the stator and the bracket, and are connected with the
stator winding. A connector base includes connection terminals
connected with tip ends of the connection portions, a base portion
with the connection terminals disposed on a surface thereof, and
nuts mounted on the base portion. Leads have, at their one end,
lead-side terminals in contact with the connection terminals.
Screws are threaded on the nuts, respectively, for coupling the
connection terminals and the lead-side terminals.
Inventors: |
Okazaki, Masafumi; (Tokyo,
JP) ; Akutsu, Satoru; (Tokyo, JP) ; Hemmi,
Shinsuke; (Tokyo, JP) |
Correspondence
Address: |
SUGHRUE MION, PLLC
2100 PENNSYLVANIA AVENUE, N.W.
SUITE 800
WASHINGTON
DC
20037
US
|
Assignee: |
MITSUBISHI DENKI KABUSHIKI
KAISHA
|
Family ID: |
34805944 |
Appl. No.: |
10/849226 |
Filed: |
May 20, 2004 |
Current U.S.
Class: |
310/71 |
Current CPC
Class: |
B62D 5/0403 20130101;
H02K 5/1732 20130101; H02K 29/06 20130101; H02K 3/522 20130101;
H01R 11/11 20130101; H02K 5/225 20130101; H02K 11/33 20160101 |
Class at
Publication: |
310/071 |
International
Class: |
H02K 011/00 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 12, 2004 |
JP |
2004-035689 |
Claims
What is claimed is:
1. A motor for an electric power steering apparatus comprising: a
bottomed cylindrical frame; a bracket disposed at an opening
portion of said frame; a rotor having a shaft rotatably disposed on
a central axis of said frame; a stator fixedly attached to said
frame around an outer periphery of said rotor and having a stator
winding wound thereon; stator-side terminals disposed between said
stator and said bracket and each having a connection portion
extending toward said bracket, said stator-side terminals being
connected with said stator winding; a connector base including
connection terminals connected with tip ends of said connection
portions, a base portion with said connection terminals being
disposed on a surface thereof, and female threaded portions mounted
on said base portion; leads having, at their one end, lead-side
terminals, respectively, which are placed in contact with said
connection terminals for introducing electric current from outside
to said stator winding; and male threaded members threaded on said
female threaded portions, respectively, for coupling said
connection terminals and said lead-side terminals with each
other.
2. The motor for an electric power steering apparatus as set forth
in claim 1, wherein said connector base, said connection terminals
and said female threaded portions are integrally formed with said
base portion by means of insert molding.
3. The motor for an electric power steering apparatus as set forth
in claim 1, wherein said base portion is formed with receiving
portions for receiving therein said female threaded portions,
respectively.
4. The motor for an electric power steering apparatus as set forth
in claim 3, wherein each of said receiving portions has an inner
diameter greater than an outer diameter of a corresponding one of
said female threaded portions with a clearance being formed between
an inner wall of each of said receiving portions and an outer wall
of the corresponding one of said female threaded portions.
5. The motor for an electric power steering apparatus as set forth
in claim 1, wherein said connector base is constructed such that
each of said connection terminals has a burred surface which is
subjected to a female threading process whereby each connection
terminal and a corresponding female threaded portion are formed by
a single member.
6. The motor for an electric power steering apparatus as set forth
in claim 1, wherein a rib is provided between adjacent ones of said
connection terminals for guiding said lead-side terminals onto said
connection terminals.
7. The motor for an electric power steering apparatus as set forth
in claim 1, wherein said bracket has a work hole formed at a
location opposing said male threaded members for enabling the
turning, operation of said male threaded members from the outside
of said bracket.
8. A motor for an electric power steering apparatus comprising: a
bottomed cylindrical frame; a bracket disposed at an opening
portion of said frame; a rotor having a shaft rotatably disposed on
a central axis of said frame; a stator fixedly attached to said
frame around an outer periphery of said rotor and having a stator
winding wound thereon; stator-side terminals disposed between said
stator and said bracket and each having a connection portion
extending toward said bracket, said stator-side terminals being
connected with said stator winding; male threaded members each
having a head with which a tip end of a corresponding one of said
connection portions is connected; leads having, at their one end,
lead-side terminals, respectively, which are electrically connected
with said male threaded members for introducing electric current
from outside to said stator winding; and female threaded members
threaded on said male threaded members, respectively, to cooperate
with their heads to clamp said lead-side terminals
therebetween.
9. The motor for an electric power steering apparatus as set forth
in claim 8, wherein each of said heads of said male threaded
members has a polygonal shape in plan, with a detent member being
disposed around said heads for inhibiting the rotation of said male
threaded members.
10. The motor for an electric power steering apparatus as set forth
in claim 8, wherein said bracket has a work hole formed at a
location opposing said female threaded members for enabling the
turning operation of said female threaded members from the outside
of said bracket.
11. A motor for an electric power steering apparatus comprising: a
bottomed cylindrical frame; a bracket disposed at an opening
portion of said frame; a rotor having a shaft rotatably disposed on
a central axis of said frame; a stator fixedly attached to said
frame around an outer periphery of said rotor and having a stator
winding wound thereon; stator-side terminals disposed between said
stator and said bracket and each having a connection portion
extending toward said bracket, said stator-side terminals being
connected with said stator winding; leads having, at their one end,
lead-side terminals, respectively, extending toward an outer side
of said bracket while being overlapped with said connection
portions from their intermediate portion to their tip end for
introducing electric current from outside to said stator winding;
male threaded members extending through said lead-side terminals
and said connection portions, respectively; and female threaded
members threaded on said male threaded members, respectively, to
cooperate therewith to couple said lead-side terminals and said
connection portions with each other.
12. The motor for an electric power steering apparatus as set forth
in claim 11, wherein each of said connection portions and said
lead-side terminals has its one end extending up to the outer side
of said bracket, and said connection portions and said lead-side
terminals are coupled with each other at a location outside of the
bracket.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a motor for an electric
power steering apparatus (hereinafter simply referred to as
"motor") adapted to assist a steering force or effort of a driver
applied to the steering wheel of a vehicle.
[0003] 2. Description of the Related Art
[0004] In the past, there has been known a motor for an electric
power steering apparatus which includes a bottomed cylindrical
frame, a bracket disposed at an opening portion of the frame, a
rotor having a shaft rotatably disposed on the central axis of the
frame, a stator fixedly attached to the frame around the outer
periphery of the rotor and having a stator winding wound thereon,
and stator-side terminals which are arranged between the stator and
the bracket, have connection portions, respectively, extending
toward the bracket and are connected with the stator winding, and
leads having, at their one end, lead-side terminals extending
toward an outer side of the bracket while being overlapped with the
connection portions of the stator-side terminal from their
intermediate portion to their tip end for introducing electric
current from the outside to the stator winding, wherein the
lead-side terminals and the connection portions are connected with
each other through welding (for example, see a first patent
document 1: Japanese patent application laid-open No. 2002-354755
(FIG. 1)).
[0005] In such a known motor for an electric power steering
apparatus, the lead-side terminals are connected through welding
with the connection portion of the stator-side terminal, and hence
there arises a problem that connection work is troublesome and
assemblability is poor.
[0006] In addition, for example, in cases where some defect is
found upon inspection after assembly of the motor and there arises
a need for disassembling the motor, there occurs another problem.
That is, troublesome work is required, such as separating, by
cutting, the lead-side terminals and the connection portions of the
stator-side terminals from each other, and the lead-side terminals
and the connection portions can not be reused as they are.
SUMMARY OF THE INVENTION
[0007] Accordingly, the present invention is intended to obviate
the above-mentioned various problems, and has for its object to
provide a motor for an electric power steering apparatus in which
working efficiency such as assemblability and disassemblability can
be improved, and which, upon reassembling after having been
disassembled, can be assembled again without requiring any new or
additional members.
[0008] Bearing the above object in mind, according to the present
invention, there is provided a motor for an electric power steering
apparatus including: a bottomed cylindrical frame; a bracket
disposed at an opening portion of the frame; a rotor having a shaft
rotatably disposed on a central axis of the frame; and a stator
fixedly attached to the frame around an outer periphery of the
rotor and having a stator winding wound thereon. Stator-side
terminals are disposed between the stator and the bracket and each
has a connection portion extending toward the bracket, the
stator-side terminals being connected with the stator winding. A
connector base includes connection terminals connected with tip
ends of the connection portions, a base portion with the connection
terminals being disposed on a surface thereof, and female threaded
portions mounted on the base portion. Leads have, at their one end,
lead-side terminals, respectively, which are placed in contact with
the connection terminals for introducing electric current from
outside to the stator winding. Male threaded members are threaded
on the female threaded portions, respectively, for coupling the
connection terminals and the lead-side terminals with each
other.
[0009] The motor for an electric power steering apparatus as
constructed above according to the present invention can be
improved in its assembling and disassembling efficiency, and it is
possible to reassemble the motor without requiring any new or
additional members after it has been once disassembled.
[0010] The above and other objects, features and advantages of the
present invention will become more readily apparent to those
skilled in the art from the following detailed description of
preferred embodiments of the present invention taken in conjunction
with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] FIG. 1 is a cross sectional side view of a motor for an
electric power steering apparatus according to a first embodiment
of the present invention.
[0012] FIG. 2 is a front elevational view of the motor of FIG.
1.
[0013] FIG. 3 is a partial perspective front elevational view of
the motor of FIG. 2.
[0014] FIG. 4 is a disassembled cross sectional view of the motor
of FIG. 1.
[0015] FIG. 5 is a side elevational view of the motor of FIG.
1.
[0016] FIG. 6 is a plan view of a connector base of FIG. 1.
[0017] FIG. 7 is a cross sectional view of essential portions of
the connector base of FIG. 6.
[0018] FIG. 8 is a plan view showing another example of the
connector base.
[0019] FIG. 9 is a cross sectional view of essential portions of
the connector base of FIG. 8.
[0020] FIG. 10 is a disassembled cross sectional side view of the
connector base of FIG. 8.
[0021] FIG. 11 is a plan view showing a further example of the
connector base.
[0022] FIG. 12 is a plan view showing a still further example of
the connector base.
[0023] FIG. 13 is a cross sectional view of essential portions of
the connector base of FIG. 12.
[0024] FIG. 14 is a plan view showing a still further example of
the connector base.
[0025] FIG. 15 is a cross sectional view of essential portions of
the connector base of FIG. 14.
[0026] FIG. 16 is a cross sectional side view of a motor for an
electric power steering apparatus according to a second embodiment
of the present invention.
[0027] FIG. 17 is a front elevational view of the motor of FIG.
16.
[0028] FIG. 18 is a partial perspective front elevational view of
the motor of FIG. 17.
[0029] FIG. 19 is a plan view of bolts and a detent member of FIG.
16.
[0030] FIG. 20 is a cross sectional view of essential portions of
FIG. 19.
[0031] FIG. 21 is a cross sectional side view showing a state that
a bolt and a detent member of FIG. 16 are separated from each
other.
[0032] FIG. 22 is a cross sectional side view of a motor for an
electric power steering apparatus according to a third embodiment
of the present invention.
[0033] FIG. 23 is a front elevational view of the motor of FIG.
22.
[0034] FIG. 24 is a partial perspective front elevational view of
the motor of FIG. 23.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0035] Hereinafter, preferred embodiments of the present invention
will be described in detail while referring to the accompanying
drawings. Throughout the following embodiments of the present
invention, the same or corresponding members or parts are
identified by the same reference numerals and characters.
Embodiment 1
[0036] FIG. 1 is a cross sectional side view of a motor 1 for an
electric power steering apparatus (hereinafter simply referred to
as "motor"). FIG. 2 is a front elevational view of the motor 1 of
FIG. 1. FIG. 3 is a partial perspective front elevational view of
FIG. 2. FIG. 4 is a disassembled view of the motor 1 of FIG. 1.
FIG. 5 is a side elevational view of the motor 1.
[0037] The motor 1 includes a bottomed cylindrical frame 2, a
stator 3 fixedly attached to the frame 2, a rotor 6 composed of a
shaft 4 and a cylindrical magnet 5 which is fixedly secured to the
outer peripheral surface of the shaft 4 and which comprises N
magnetic poles and S magnetic poles, a bracket 8 fixedly attached
to the peripheral portion of the frame 2 by bolts 7 and having a
work hole 34, a resolver-type rotation sensor fitted into the
bracket 8, a bracket-side bearing 10 fitted into the bracket 8 for
rotatably supporting one end of the shaft 4, a frame-side bearing
11 fixedly fitted into a concave portion of the bottom of the frame
2 for rotatably supporting the other end of the shaft 4, a
plurality of leads 14 of respective phases penetrating through a
grommet 13, a sensor signal cable 15 having a plurality of bundled
sensor signal wires and penetrating through the grommet 13, and a
connector base 16 connecting the leads 14 of the respective phases
and a connection board 12. Here, note that the magnet 5 may
comprise a plurality of arc magnets.
[0038] The stator 3 is provided with a stator core 17 having a
plurality of axial slots (not shown) formed at intervals in a
circumferential direction thereof, a stator winding 18 arranged in
the slots of the stator core 17 and wound therearound, and a bobbin
19 arranged between the stator core 17 and stator winding 18.
[0039] The rotation sensor 9 is provided with an elliptical rotor
20 fixedly mounted on the shaft 4, and a stator 21 arranged around
the outer periphery of the rotor 20.
[0040] The connection board 12 is provided with a holder 22 having
a plurality of grooves, stator-side terminals 23 of U phase, V
phase and W phase received in the grooves, respectively, and a
plurality of connection portions 27 each extending from a tip end
of a corresponding stator-side terminal 23 of each phase toward the
connector base 16. The stator-side terminals 23 of the respective
phases are connected with the stator winding 18, and each has a
belt shape when expanded in a planar configuration, but a circular
shape when received in a corresponding groove.
[0041] The connector base 16 includes a base portion 25 with
tapered insertion openings 24 each diverging toward an opening
portion, and female threaded portion in the form of nuts 26
embedded in the base portion 25, as shown in FIG. 6 and FIG. 7. The
connection terminals 28 of the respective phases are connected with
the corresponding stator-side terminals 23 of the respective phases
through the connection portions 27 protruding in an axial direction
from the insertion openings 24. The connection terminals 28 are
integrally formed with the base portion 25 together with the nuts
26 by means of insert molding. The base portion 25 is formed at its
one end with a protrusion 32 that protrudes toward the bracket 8,
with its tip end being engaged into an engagement hole 37 in the
bracket 8.
[0042] The leads 14 of the U phase, V phase and W phase are formed
at their one end with lead-side terminals 29 of the respective
phases. These lead-side terminals 29 are overlapped on the
corresponding connection terminals 28, and male threaded members in
the form of screws 30 are passed through the through holes 31 in
the connection terminals 28 and the through holes (not shown) in
the lead-side terminals 29 to be threaded into the base portion 25,
whereby the lead-side terminals 29 of the respective phases are
joined to the connection terminals 28 of the corresponding
phases.
[0043] Here, note that the connector base may comprises a connector
base 116 which can be constructed in the following manner, as shown
in FIGS. 8 through 10. That is, this connector base 116 has a base
portion 125 which is formed with nut receiving portions in the form
of nut insertion holes 125a. Nuts 26 are inserted into the
corresponding nut insertion holes 125a, and then protrusions 128a
of connection terminals 128 are press-fitted into the base portion
125.
[0044] At this time, a clearance 6 may be formed between each nut
insertion hole 125a and a corresponding nut 26, as shown in FIG.
11. By so doing, after insertion of the nuts 26 into the nut
insertion holes 125a, the nuts 26 are permitted to move in a
diametral direction only within the clearance, so that the mounting
positions of the connection terminals 128 can be adjusted in a
diametral direction from the central axis of the connector base
116.
[0045] Moreover, as shown in FIG. 12 and FIG. 13, a connector base
226 may be constructed as follows. That is, connection terminals
228 are burred and formed on the surfaces thereof with female
threads by means of a threading process. Then, the connection
terminals 228 thus formed with the femal threads are press-fitted
into a base portion 225 to provide the connector base 226. In this
case, each connection terminal 228 and a corresponding female
threaded portion are formed into a single member or unit, thus
making it possible to reduce the number of component parts.
[0046] Further, as shown in FIG. 14 and FIG. 15, the base portion
25 has axially extending ribs 36 formed between the connection
terminals 28 of the respective phases.
[0047] By the provision of the ribs 36, the electrical insulation
between the adjacent connection terminals 28 is ensured and at the
same time, the ribs 36 serve as guides for overlapping the
lead-side terminals 29 of the respective phases with the
corresponding connection terminals 28.
[0048] Next, reference will be made to the procedure of assembling
the motor of the above construction.
[0049] First of all, the rotor 6 with the frame-side bearing 11
fixedly attached thereto is mounted on the bracket 8 having the
bracket-side bearing 10 fixedly attached thereto. At this time, at
the rotor 6 side, the connection portions 27 extending from the tip
ends of the stator-side terminals 23 are inserted into the
insertion openings 24 in the connector base 16, and the tip ends of
the connection portions 27 of the respective phases are joined with
the corresponding connection terminals 28 of the respective phases
by means of welding. Then, a grommet 13, through which the leads 14
of the respective phases extend, is mounted on the bracket 8. After
this, the frame 2 having the stator 3 fixedly mounted thereon is
fixedly secured to the bracket 8 by the use of the bolts 7. An O
ring 33 is arranged between the bracket 8 and the frame 2 for
ensuring the waterproofness of the motor 1.
[0050] Finally, the lead-side terminals 29 of the respective phases
at the one end portions of the leads 14 of the respective phases
are overlapped on the connection terminals 28 of the connector base
16 so as to be placed in surface-to-surface contact therewith. The
male threaded members in the form of the screws 30 are threaded
into the female threaded portions in the form of the nuts 26 of the
connector base 16 while passing through the through holes (not
shown) in the lead-side terminals 29 of the respective phases and
the through holes 31 in the connection terminals 28, and by
coupling the lead-side terminals 29 of the respective phases and
the connection terminals 28 with each other, the leads 14 of the
respective phases and the stator winding 18 are electrically
connected with one another.
[0051] In the motor 1 of the above construction, electric current
flows from the leads 14 of the respective phases into the stator
winding 18, whereby a rotating field generated by the stator
winding 18 is applied to the rotor 6 to cause it to rotate. The
rotational force of the shaft 4 of the rotor 6 is transmitted to a
steering mechanism of a vehicle, on which the motor 6 is installed,
through a boss 35 formed on an end portion of the shaft 4, so that
it is supplied to the steering wheel of the vehicle to assist the
steering force or effort of the driver.
[0052] Furthermore, the magnetic field of the stator 21 is varied
in accordance with the rotation of the elliptical rotor 20, and the
value of the varying magnetic field is output through the sensor
signal cable 15 as a corresponding voltage, so that the rotational
angle of the rotor 6 is thereby detected.
[0053] As described in the foregoing, according to the motor 1 of
this first embodiment, the lead-side terminals 29 of the respective
phases and the connection terminals 28 of the respective phases are
coupled with each other through the male threaded members in the
form of the screws 30 by turning them by means of a screw driver
inserted from the work hole 34 in the bracket 8. Thus, the leads 14
of the respective phases and the stator winding 18 can be
electrically connected with one another in a reliable and simple
manner, and at the same time, screw fastening work can be performed
from outside of the bracket 8, resulting in improvements in the
assembling operation. In addition, a housing (not shown) receiving
therein the steering mechanism of the vehicle is fitted into a
flange 8a of the bracket 8. As a result, the work hole 34 in the
bracket 8 is not exposed to the outside of the housing and hence
there is no need to specially provide a waterproof member for the
work hole 34 so as to close it for the purpose of waterproof.
[0054] Moreover, the lead-side terminals 29 of the respective
phases and the connection terminals 28 of the respective phases are
coupled with each other by the male threaded members in the form of
the screws 30. Accordingly, the coupling operation is easy so that
the disassembling operation of the motor 1 can be carried out
easily without damaging its component members.
[0055] Further, at the time of coupling the lead-side terminals 29
and the connection terminals 28 with each other by means of the
screws 30, the protrusion 32 on the connector base 16 is engaged
with the engagement hole 37 in the bracket 8, whereby it is
possible to prevent relative sliding movement between the lead-side
terminals 29 of the respective phases and the connection terminals
28 of the respective phases due to a torque force generated in the
coupling operation by the screws 30. Consequently, wear and damage
of the lead-side terminals 29 of the respective phases and the
connection terminals 28 of the respective phases can be
avoided.
[0056] Here, note that even in cases where a protrusion is formed
on the bracket and an engagement hole engaged by the protrusion is
formed in the connector base, a similar effect as stated above can
be achieved.
[0057] Furthermore, the rotation sensor 9 is arranged outside of
the bracket-side bearing 10, so that the stator 21 can be adjusted
in its position even after the frame 2 has been fixedly attached to
the bracket 8 by the bolts 7.
Embodiment 2
[0058] FIG. 16 is a cross sectional side view of a motor 40 for an
electric power steering apparatus according to a second embodiment
of the present invention. FIG. 17 is a front elevational view of
the motor 40 of FIG. 16. FIG. 18 is a partial perspective front
elevational view of the motor 40 of FIG. 17. FIG. 19 is a plan view
of a bolt and a detent member of FIG. 16.
[0059] In the motor 40 of this second embodiment, as shown in FIG.
19 through FIG. 21, each connection portion 41 of an L-shaped cross
section has one leg portion that protrudes from a corresponding
stator-side terminal 23 toward a bracket 8 and is welded to a
hexagonal head 42a of a corresponding bolt 42 which constitutes a
male threaded member. The peripheral sides of each bolt head 42a
are covered with a detent member 43 made of resin so as to inhibit
the rotation of the bolts 42. Each of the bolts 42 penetrates
through a through hole in a corresponding one of lead-side
terminals 29 of respective phases, and at the same time is threaded
at its one end by a nut 44 which constitutes a female threaded
member. In addition, the detent member 43 is formed with a
protrusion 32, which is engaged into an engagement hole 37 formed
in the bracket 8.
[0060] The construction of this second embodiment other than the
above is similar to that of the first embodiment.
[0061] In this second embodiment, after a frame 2 with a stator 3
fixedly attached thereto is fixedly secured to the bracket 8 by
means of bolts 7, female threaded members in the form of the nuts
44 are threaded on the bolts 42, so that the nuts 44 and the bolt
heads 42a cooperate with each other to clamp the lead-side
terminals 29 of the respective phases therebetween thereby to
electrically connect leads 14 of respective phases and a stator
winding 18 with one another. At this time, the protrusion 32 is
engaged into the engagement hole 37 in the bracket 8, whereby the
connection portions 41 and the like can be prevented from being
damaged due to a torque force generated in the coupling operation
by the nuts 44.
[0062] Here, note that an engagement hole may be formed in the
detent member, and a protrusion being engaged into the engagement
hole may be formed on the bracket.
[0063] In the motor 40 of the second embodiment as described above,
though the connector base 16 employed by the motor 1 of the first
embodiment is not provided, the same effect as in the first
embodiment can be achieved.
Embodiment 3
[0064] FIG. 22 is a cross sectional side view of a motor 50 for an
electric power steering apparatus according to a third embodiment
of the present invention. FIG. 23 is a front elevational view of
the motor 50 of FIG. 22. FIG. 24 is a partial perspective front
elevational view of the motor 50 of FIG. 23.
[0065] In the motor 50 of this third embodiment, a tip end of each
connection portion 51 extends through a corresponding through hole
55 in a bracket 8 up to an outer side thereof, and each of
lead-side terminals 52 of respective phases each having an L-shaped
cross section also extends through a corresponding through hole 55
to the outer side of the bracket 8. The connection portions 51 and
the lead-side terminals 52 are formed at their one ends with
through holes through which male threaded members in the form of
bolts 53 extend, respectively. Female threaded members in the form
of nuts 54 are threaded on one ends of the bolts 53,
respectively.
[0066] The construction of this third embodiment other than the
above is similar to that of the first embodiment.
[0067] In this third embodiment, after a frame 2 having a stator 3
fixedly mounted thereon is fixedly secured to a bracket 8 by the
use of bolts 7, the lead-side terminals 52 of the respective phases
and the corresponding connection portions 51 of the respective
phases are coupled with each other by using the bolts 53 and the
nuts 54 thereby to electrically connect leads 14 of respective
phases and a stator winding 18 with each other.
[0068] In the motor 50 of this third embodiment, the connector base
employed by the motor 1 of the first embodiment is omitted and the
detent member employed by the motor 40 of the second embodiment is
also omitted. Thus, in this third embodiment, the number of
component parts of the motor 50 is reduced and the structure
thereof is simple in comparison with the first and second
embodiments, but the same effect as in the first embodiment can be
achieved.
[0069] Although in the above-mentioned respective embodiments, the
nuts are used as the female threaded portions or the female
threaded members, and the bolts are used as the male threaded
members, the present invention is not limited to the use of these
nuts and bolts, but any detachable coupling or fastening devices or
mechanisms may of course be used.
[0070] While the invention has been described in terms of preferred
embodiments, those skilled in the art will recognize that the
invention can be practiced with modifications within the spirit and
scope of the appended claims.
* * * * *