JP2008104321A - Brushless motor, and motor for electrically operated power steering device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brushless motor which attains downsizing of an axial direction, and suppresses deterioration in detection accuracy of a rotary detection sensor. <P>SOLUTION: The motor 2 includes a housing case 11 of a cylindrical shape with a bottom, a stator 12, a rotor 13 having a rotating shaft 31, a pair of bearings 15a, 15b which pivotally support the rotating shaft 31, and a resolver 53. One bearing 15a is arranged at a bottom portion 11a of the housing case 11. Moreover, a holder plate 41 is fixed to an opening 11c of the housing case 11, wherein on the holder plate, a sensor stator holding portion 42 and a bearing holding portion 43 which line up in an axial direction, and form a coaxial shape are formed on a sheet material consisting of a steel material. Furthermore, the other bearing 15b is made of the steel material, and held in and retained by the bearing holding portion 43. A sensor stator 51 constituting the resolver 53 is held in and retained by the sensor stator holding portion 42, and the bearing 15b and the sensor stator 51 adjoin in the axial direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a brushless motor and a motor for an electric power steering device used in an in-vehicle electric power steering device.

  Conventionally, a brushless motor has been provided with a rotation detection sensor in order to detect the rotation state of the rotor (rotation position, rotation speed, etc. with respect to the stator). The rotation detection sensor includes an annular sensor rotor that is fixed to the rotation shaft of the rotor and rotates integrally with the rotation shaft, and an annular sensor stator that is disposed so as to face the sensor rotor in the radial direction. There is something.

  For example, in the brushless motor described in Patent Document 1, the rotation shaft of the rotor is disposed on the bottom of the bottomed cylindrical housing case and on the flange member attached to the opening of the housing case. It is supported by a pair of bearings. The sensor stator is fixed to the inner peripheral surface of the substantially cylindrical sensor holder, and the sensor holder is fixed to the flange member so that the sensor stator is opposed to the sensor rotor fixed to the rotation shaft in the radial direction. The

Moreover, in the brushless motor described in Patent Document 2, the rotation shaft of the rotor is a pair of bottom frames of a bottomed cylindrical housing case and a pair of end frames that are disposed on an end frame that closes the opening of the housing case. It is supported by a bearing. The sensor stator is fixed to the other end surface (inner surface) opposite to the one end surface (outer surface) to which the bearing is fixed in the end frame, and the bearing and the sensor stator are separated from each other in the axial direction. It has become. Incidentally, such an end frame is generally made of aluminum, and the housing recess for housing the bearing and the housing recess for housing the sensor stator are formed by cutting.
JP 2003-88081 A JP 2006-87277 A

  However, in the brushless motor described in Patent Document 1, since the sensor stator is fixed to the flange member to which the bearing is fixed via the sensor holder, the sensor stator is fixed to the rotating shaft pivotally supported by the bearing. The center axis of the sensor rotor and the center axis of the sensor stator are likely to be displaced.

  In the brushless motor described in Patent Document 2, the housing recesses in which the bearing and the sensor stator are respectively housed in the end frame are formed by cutting. Therefore, in order to form the receiving recesses on the two end surfaces of the end frame, the plate material to be the end frame is fixed with a chuck of a machine tool for cutting, and one receiving recess is formed on one end surface of the plate material. After the formation, the direction of the plate material is changed and the plate material is fixed again by the chuck, and the other receiving recess is formed on the other end surface of the plate material. Therefore, it becomes difficult to make the central axes of the two housing recesses coincide with each other. As a result, the center axis of the sensor rotor fixed to the rotating shaft pivotally supported by the bearing housed in one housing recess and the center axis of the sensor stator housed in the other housing recess are likely to deviate.

  From these, in the brushless motors described in Patent Document 1 and Patent Document 2, the rotational state of the rotor detected using the rotation detection sensor due to the relative displacement between the sensor rotor and the sensor stator, There is a risk of deviation from the actual rotational state of the rotor. In other words, the detection accuracy of the rotation detection sensor may be reduced.

  Furthermore, in the brushless motor described in Patent Document 2, since the end frame is made of aluminum, the end frame is formed thick in the axial direction in order to ensure its strength. Therefore, it has been difficult to reduce the axial size of the brushless motor having the end frame. Furthermore, in the brushless motor described in Patent Document 2, when the bearing disposed on the end frame is formed of a steel material, the wire between the aluminum end frame and the bearing when the brushless motor is at a high temperature. There may be a gap between the end frame and the outer peripheral surface of the bearing due to the expansion difference. Therefore, when the brushless motor is used in Patent Document 1 as a motor for an electric power steering device that is particularly likely to become high temperature, when the motor is driven, the end frame and the outer peripheral surface of the bearing disposed on the end frame are There was a problem that gaps were likely to occur between them.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a brushless motor and an electric power steering apparatus capable of reducing the detection accuracy of the rotation detection sensor while reducing the axial size. It is to provide a motor.

  In order to solve the above-mentioned problem, the invention described in claim 1 has a bottomed cylindrical housing case, a stator fixed to the inside of the housing case, and a rotating shaft disposed inside the stator. A rotor, a pair of annular bearings that support the rotation shaft, a sensor rotor that is fixed to the rotation shaft and rotates integrally with the rotation shaft, and an annular shape that is disposed to face the sensor rotor in a radial direction A rotation detection sensor for detecting the rotation state of the rotor, wherein one of the pair of bearings is disposed at the bottom of the housing case In the opening of the housing case, a holder plate is formed by forming, on a plate made of a steel material, a first housing portion and a second housing portion that are aligned in the axial direction and are coaxial. The other bearing of the pair of bearings is made of a steel material and is housed and held in the first housing portion, the sensor stator is housed and held in the second housing portion, and the other of the pair of bearings The gist is that the bearing and the sensor stator are adjacent in the axial direction.

  According to this configuration, the holder plate that holds the other bearing and the sensor stator is formed of a plate material made of a steel material. Therefore, since the holder plate (end frame) is not formed using an aluminum material as in the prior art, it is not necessary to form the holder plate thick in the axial direction to ensure strength. As a result, it is possible to reduce the axial size of the brushless motor by reducing the thickness of the holder plate in the axial direction. The sensor stator is directly fixed to the holder plate holding the other bearing. Accordingly, since the center axis of the other bearing and the center axis of the sensor stator are likely to coincide with each other, the center axis of the sensor rotor fixed to the rotary shaft supported by the bearing and the center axis of the sensor stator It becomes easier to match. From these things, the fall of the detection accuracy of a rotation detection sensor can be controlled. Furthermore, since the holder plate is made of a steel material like the other bearing, the holder plate and the bearing have substantially the same linear expansion coefficient. As a result, when a brushless motor becomes high temperature, it is suppressed that a clearance gap arises between a holder plate and the outer peripheral surface of the other bearing.

In the present invention, the term “coaxial” means a state in which the central axes of each member coincide with each other in two or more members.
According to a second aspect of the present invention, there is provided a bottomed cylindrical housing case, a stator fixed inside the housing case, a rotor disposed inside the stator and having a rotation shaft, and the rotation shaft. A pair of annular bearings, a sensor rotor fixed to the rotating shaft and rotating integrally with the rotating shaft, and an annular sensor stator arranged to face the sensor rotor in a radial direction, A rotation detection sensor for detecting a rotation state of the rotor, wherein one of the pair of bearings is disposed at a bottom portion of the housing case, and the opening of the housing case The plate is made of steel material by pressing from one direction along the axial direction to form a first receiving portion and a second receiving portion that are aligned in the axial direction and are coaxial. And the other of the pair of bearings is housed and held in the first housing portion, the sensor stator is housed and held in the second housing portion, and the other bearing and The gist of the sensor stator is that it is adjacent in the axial direction.

  According to this configuration, the holder plate that holds the other bearing and the sensor stator is formed of a plate material made of a steel material. Therefore, since the holder plate (end frame) is not formed using an aluminum material as in the prior art, it is not necessary to form the holder plate thick in the axial direction to ensure strength. As a result, it is possible to reduce the axial size of the brushless motor by reducing the thickness of the holder plate in the axial direction. The sensor stator is directly fixed to the holder plate holding the other bearing. Accordingly, since the center axis of the other bearing and the center axis of the sensor stator are likely to coincide with each other, the center axis of the sensor rotor fixed to the rotary shaft supported by the bearing and the center axis of the sensor stator It becomes easier to match. Further, the first housing portion for housing and holding the bearing and the second housing portion for housing and holding the sensor stator are pressed from one direction along the axial direction with respect to the plate material to be the holder plate ( (Including deep drawing). Therefore, in order to form the first and second accommodating portions, the first and second accommodating portions are formed by fixing the plate material serving as the holder plate once to the machine tool that performs the press working. Can do. Therefore, it is suppressed that the center axis of the 1st accommodating part and the center axis of the 2nd accommodating part shift, and the center axis of the other bearing accommodated in the 1st accommodating part, and the 2nd accommodating part Deviation from the center axis of the accommodated sensor stator is suppressed. From these things, the fall of the detection accuracy of a rotation detection sensor can be controlled.

In the present invention, the term “coaxial” means a state in which the central axes of each member coincide with each other in two or more members.
According to a third aspect of the present invention, in the brushless motor according to the first or second aspect, the stator has a plurality of armature coils, and an end of the housing case on the opening side of the stator. A plurality of conductive plates having a conductive and curved belt shape and electrically connecting the end portions of the predetermined armature coils to each other so that the plate thickness direction coincides with the radial direction. The first housing portion and the second housing portion protrude from the opening side of the housing case toward the bottom side, and at least of the first and second housing portions. The gist is that a part of the conductive plate is disposed on the radially inner side of the conductive plate.

  According to the same configuration, among the plurality of armature coils provided in the stator, the plurality of conductive plates that electrically connect the end portions of the predetermined armature coils respectively coincide with the radial direction of the plate thickness direction. Are arranged in a ring shape. Thus, when the conductive plate is arranged in an annular shape so that the plate thickness direction coincides with the radial direction, the space required for the arrangement of the conductive plate is reduced in the radial direction, and a plurality of conductive plates arranged in the annular shape are arranged. A space is created on the inside in the radial direction. Then, at least a part of the first housing portion and the second housing portion formed so as to protrude from the opening side of the housing case toward the bottom side is disposed in the space on the radially inner side of the conductive plate. As a result, the brushless motor can be further downsized in the axial direction.

  According to a fourth aspect of the present invention, in the brushless motor according to any one of the first to third aspects, the one of the bearings is disposed at the center of the bottom portion of the housing case, and the first housing is provided. And the second accommodating portion are formed such that a central axis thereof coincides with a central axis of the holder plate, and the holder plate extends toward the housing case along the axial direction and extends from the axial direction. The gist of the invention is that the holder plate has an inlay portion whose outer peripheral surface is located on a circle having a diameter equal to the inner diameter of the opening of the housing case with the center of the holder plate as the center.

  According to the same configuration, the inlay portion is formed so that the outer peripheral surface thereof is located on a circle having the diameter equal to the inner diameter of the opening of the housing case with the center of the holder plate as the center when viewed from the axial direction. Yes. Accordingly, the holder plate is fixed to the housing case so that the outer peripheral surface of the spigot part is in contact with the inner peripheral surface of the opening of the housing case, so that the holder plate and the housing case are coaxially aligned with higher accuracy. It can be. Therefore, the bearing disposed in the center of the bottom portion of the housing case and the bearing accommodated in the first accommodating portion of the holder plate are coaxial with higher accuracy. As a result, the center axis of the sensor rotor fixed to the rotating shaft supported by the two bearings and the center axis of the sensor stator housed in the second housing portion formed on the holder plate more closely match. It becomes easy. Accordingly, it is possible to further suppress a decrease in detection accuracy of the rotation detection sensor.

  According to a fifth aspect of the present invention, in the brushless motor according to any one of the first to fourth aspects, the rotation detection signal output from the rotation detection sensor and corresponding to the rotation position of the rotor is provided. The gist of the invention is that it includes a circuit housing portion that houses a drive circuit that controls energization of the stator, and the circuit housing portion is disposed at a position adjacent to the holder plate in the axial direction.

  According to this configuration, the holder plate for holding the other bearing and the sensor stator is made thinner in the axial direction than in the prior art, so the circuit accommodating portion is arranged so as to be aligned with the holder plate in the axial direction. Thus, it is possible to prevent the brushless motor from being enlarged in the axial direction and downsize in the radial direction.

  According to a sixth aspect of the present invention, in the brushless motor according to the fifth aspect, the housing case has a housing side flange portion extending radially outward at an opening thereof, and the housing side flange portion has a circumferential direction. A plurality of locations are fixed to the circuit housing portion by screwing with a first fixing screw, and a plurality of locations in the circumferential direction of the counterpart housing for fixing the brushless motor are screwed together from the counterpart housing side. The gist of the invention is that it is screwed to the circuit housing portion with a second fixing screw.

  According to this configuration, the housing case in which the stator and the rotor are accommodated is fixed to the mating housing via the circuit accommodating portion. In general, when the housing case is directly fixed to the mating housing, the portion of the mating housing where the housing case is fixed becomes larger in accordance with the outer diameter of the housing flange portion. Therefore, by adopting a configuration in which the housing case is fixed to the mating housing via the circuit housing portion as in this configuration, the size of the portion of the mating housing where the brushless motor is fixed is set outside the housing flange portion. It becomes possible to make it smaller than the diameter. That is, it is possible to reduce the size of the part where the brushless motor is fixed in the counterpart housing.

  According to a seventh aspect of the present invention, in the brushless motor according to the sixth aspect, when viewed from the axial direction, the diameter of the first circle passing through the centers of the plurality of second fixing screws is the plurality of the first The gist is that the size is equal to or smaller than the diameter of the second circle passing through the center of the fixing screw.

  According to the same configuration, by setting the diameter of the first circle passing through the centers of the plurality of second fixing screws to be smaller than the diameter of the second circle passing through the centers of the plurality of first fixing screws, The size in the radial direction of the portion where the brushless motor is fixed in the counterpart housing can be made smaller than the outer diameter of the housing side flange portion.

  According to an eighth aspect of the present invention, in the brushless motor according to the sixth or seventh aspect, the circuit housing portion is a square range in which the outer peripheral circle of the housing side flange portion is inscribed when viewed in the axial direction. The gist is that it is within.

  According to this configuration, since the circuit housing portion has a size that fits within a square range in which the outer peripheral circle of the housing side flange portion is inscribed, enlargement in the radial direction of the brushless motor is suppressed.

  The gist of the ninth aspect of the invention is that the brushless motor according to any one of the first to eighth aspects is a motor for an electric power steering apparatus provided in an in-vehicle electric power steering apparatus. Yes.

  According to this configuration, the motor for the electric power steering device provided in the electric power steering device can be reduced in size in the axial direction, and a decrease in detection accuracy of the rotation detection sensor can be suppressed.

  According to the present invention, it is possible to provide a brushless motor and a motor for an electric power steering apparatus that can be downsized in the axial direction and can suppress a decrease in detection accuracy of the rotation detection sensor.

Hereinafter, an embodiment in which the present invention is embodied in a column type electric power steering apparatus motor will be described with reference to the drawings.
As shown in FIG. 1, a column type electric power steering apparatus 1 includes a motor 2 for an electric power steering apparatus (hereinafter referred to as a motor 2) in a steering column (not shown) in a vehicle compartment, and a steering operation by a driver. In response to the steering torque and vehicle speed, power assist is performed.

  More specifically, the column type electric power steering apparatus 1 includes a steering shaft 4 to which a steering wheel 3 is connected, and the motor 2 connected to the steering shaft via a speed reduction mechanism 5. The motor 2 is controlled by a drive circuit (not shown) of the motor 2 in accordance with a steering torque detected by a torque sensor (not shown) provided in the speed reduction mechanism 5. Perform power assist for operations.

  As shown in FIG. 3, the motor 2 includes a bottomed cylindrical housing case 11, a stator 12 fixed to the inner peripheral surface of the housing case 11, and a rotor disposed inside the stator 12. 13.

  In the center of the bottom portion 11a of the housing case 11, a bearing housing portion 11b opening inward is formed, and a bearing 15a is housed in the bearing housing portion 11b. The bearing 15a is an annular ball bearing.

  As shown in FIG. 4, a housing side flange portion 11d extending radially outward is formed in the opening 11c of the housing case 11, and the housing side flange portion 11d is axially arranged at a plurality of locations in the circumferential direction. A caulking pin 11e extending to the opposite side of the bottom 11a of the housing case 11 is provided. These caulking pins 11e have notches 11f formed at the tips thereof, so that the tips have a bifurcated shape (see FIG. 2). Furthermore, the housing side flange portion 11d is formed with insertion portions 11g protruding radially outward at a plurality of locations in the circumferential direction (four locations in the present embodiment), and these insertion portions 11g have screw insertion holes, respectively. 11h is formed.

  As shown in FIG. 3, the stator core 21 constituting the stator 12 has a plurality of (for example, twelve) teeth 21a (only two are shown in FIG. 3) radially extending along the radial direction. The end portions are connected in the circumferential direction to form an annular shape. The stator core 21 is provided with an insulating insulator 22 that covers portions other than the tip end surface of each tooth 21a and the inner peripheral surface of the stator core 21 from both sides in the axial direction. A conducting wire (not shown) is wound from above the insulator 22 a plurality of times. The conducting wire is wound by, for example, concentrated winding, and a plurality of armature coils 23 (for example, twelve as many as the teeth 21a) are formed by the conducting wire wound around each tooth 21a.

  A terminal holder 25 made of an insulating resin material is disposed at the end of the housing case 11 on the side of the opening 11c of the stator core 21. The terminal holder 25 has an inner diameter and an outer diameter that are the same as those of the stator core 21. It has an approximately circular shape. The terminal holder 25 is formed with engaging portions 25a extending toward the stator core 21 at a plurality of locations on the peripheral edge thereof, and by engaging the engaging portions 25a with the insulator 22, the terminal holder 25 is fixed to the stator core 21 via an insulator 22.

  As shown in FIG. 5, the terminal holder 25 is formed with a plurality of (24 in this embodiment) coil insertion holes 25b penetrating in the axial direction at positions closer to the outer periphery, and these coil insertion holes. A plurality of receiving grooves 25c that are open to the opposite side of the stator core 21 are formed inside 25b. The diameter of each coil insertion hole 25b is formed to be equal to or slightly larger than the diameter of the conductive wire constituting each armature coil 23 (see FIG. 3). Further, the plurality of receiving grooves 25 c have a circular arc shape when viewed from the axial direction, and are concentric with the central axis L <b> 1 of the stator core 21 as the center. Furthermore, the circumferential length of each housing groove 25c is set so that the end in the circumferential direction faces a predetermined coil insertion hole 25b among the plurality of coil insertion holes 25b in the radial direction. Each accommodation groove 25c accommodates a conductive plate 27 for short-circuiting the end portions 23a of predetermined armature coils 23 (see FIG. 3).

  Each of the conductive plates 27 is made of a conductive plate material and has a shape corresponding to the storage groove 25c stored therein. More specifically, as shown in FIGS. 6A and 6B, each conductive plate 27 is formed by curving a strip-shaped plate material in an arc shape. The circumferential length of each conductive plate 27 is formed to be equal to or slightly shorter than the circumferential length of the accommodating groove 25c in which each conductive plate 27 is accommodated (see FIG. 5). The width is formed slightly shorter than the depth of the receiving groove 25c (see FIG. 3). Further, at both ends in the circumferential direction of each conductive plate 27, connection pieces 27a extending from the one end in the width direction of the conductive plate 27 (the end on the opening side of the housing groove 25c) toward the outside in the radial direction are formed. Has been. As shown in FIG. 5, each connection piece 27a extends in the radial direction to the coil insertion hole 25b, and a connection hole 27b is formed at the tip thereof. The connection hole 27b is formed at a position overlapping the coil insertion hole 25b in the axial direction. In a state where each conductive plate 27 is accommodated in the corresponding accommodation groove 25c, the conductive plate 27 adjacent in the radial direction is provided by the insulating wall 25d existing between the accommodation groove 25c and the accommodation groove 25c adjacent in the radial direction. Short circuit between each other is prevented.

  As shown in FIGS. 3 and 5, both end portions 23a of each armature coil 23 are respectively inserted into two coil insertion holes 25b adjacent in the circumferential direction, and in the axial direction with the two coil insertion holes 25b. It is inserted through the overlapping connection hole 27b. In this state, both end portions 23a of each armature coil 23 are connected to the connecting piece 27a by caulking or the like, and thereby, the predetermined armature coils 23 are short-circuited.

  As shown in FIG. 3, the rotary shaft 31 constituting the rotor 13 is supported by the end portion of the housing case 11 on the bottom 11 a side by the bearing 15 a, and the rotary shaft 31 has a substantially cylindrical shape. A rotor yoke 32 is fixed. A plurality of permanent magnets 33 are arranged on the outer periphery of the rotor yoke 32, and these permanent magnets 33 abut on the outer peripheral surface of the rotor yoke 32 by a cylindrical cover 34 attached to the outer periphery of the permanent magnet 33. It is kept in the state. The cover 34 is fixed to the rotor yoke 32 by bending both ends thereof inward in the radial direction. Such a rotor 13 is disposed in the housing case 11 at a position where the permanent magnet 33 and the stator core 21 are opposed to each other in the radial direction.

  A substantially disc-shaped holder plate 41 is fixed to the opening 11 c of the housing case 11. As shown in FIG. 4, a side wall 41b protruding toward the housing case 11 along the axial direction is provided integrally with the holder body 41a at the peripheral edge of the flat holder body 41a constituting the holder plate 41. A plate-side flange portion 41c extending outward in the radial direction is integrally formed at the distal end portion of the side wall 41b. The plate-side flange portion 41c has the same outer diameter as the housing-side flange portion 11d of the housing case 11, and the plate-side flange portion 41c has a circumferential direction corresponding to the caulking pin 11e of the housing-side flange portion 11d. At a plurality of locations (four locations in the present embodiment), fixed notches 41d that are notched toward the inner periphery are formed. The fixed notches 41d are formed at equal angular intervals in the circumferential direction. The plate-side flange portion 41c has insertion portions 41e protruding outward in the radial direction at a plurality of circumferential locations (four locations in the present embodiment) corresponding to the insertion portions 11g formed in the housing-side flange portion 11d. In addition to being provided, screw insertion holes 41f are formed in these insertion portions 41e.

  Furthermore, a plurality of inlay portions 41g extending along the axial direction are formed at the tip of the side wall 41b. These inlay portions 41g are formed at equal angular intervals in the circumferential direction, and have a diameter equal to the inner diameter of the opening 11c of the housing case 11 with the center O1 of the holder plate 41 as the center when viewed from the axial direction. The outer peripheral surface 41h is located on the circle.

  As shown in FIG. 3, a sensor stator holding portion 42 that houses and holds an annular sensor stator 51 described later is provided at the center of the holder main body 41a, and at the center of the bottom 42a of the sensor stator holding portion 42, as shown in FIG. A bearing holding portion 43 is provided that accommodates and holds the other bearing 15b made of a steel material that is paired with one bearing 15a provided on the bottom 11a of the housing case 11.

  The sensor stator holding portion 42 is formed so as to protrude toward the bottom portion 11 a side of the housing case 11 along the axial direction, has a substantially cylindrical shape, and has a bottom portion 42 a as compared to the opening side according to the outer shape of the sensor stator 51. The side diameter is slightly smaller. In addition, the axial length is slightly shorter than the sensor stator 51.

  The bearing holding portion 43 is formed so as to protrude toward the bottom portion 11 a along the axial direction, and has a diameter smaller than that of the sensor stator holding portion 42 according to the bearing 15 b having a smaller outer diameter than the sensor stator 51. It has a small bottomed cylindrical shape. The bearing holding portion 43 has an inner diameter that is substantially equal to the outer shape of the bearing 15b, and an axial length that is substantially equal to that of the bearing 15b. A through hole 43 b is formed at the center of the bottom 43 a of the bearing holding portion 43, and the diameter of the through hole 43 b is slightly larger than the outer diameter of the rotating shaft 31. The bearing holding portion 43 and the sensor stator holding portion 42 have center axes L2 and L3 that coincide with each other, and the center axes L2 and L3 coincide with the center axis L5 of the holder plate 41 ( (See FIG. 4).

  The holder plate 41 configured as described above has the insertion portion 11g and the insertion portion 41e so that the caulking pin 11e of the housing side flange portion 11d is inserted into the fixed notch portion 41d of the plate side flange portion 41c. It arrange | positions with respect to the housing case 11 so that it may overlap with an axial direction. Furthermore, the holder plate 41 is disposed with respect to the housing case 11 so that the plate side flange portion 41c contacts the housing side flange portion 11d. The holder plate 41 is caulked and fixed to the housing case 11 by pushing the tip end portion (bifurcated portion) of the caulking pin 11e so that the notch portion 11f is widened (see FIG. 2). In FIG. 2, the state before the notch portion 11f is expanded is shown by a two-dot chain line, and the crimped state is shown by a solid line.

  When the holder plate 41 is fixed to the housing case 11, the center axis L <b> 2 of the sensor stator holding portion 42 and the center axis L <b> 3 of the bearing holding portion 43 are the rotation shaft 31 disposed in the housing case 11. Coincides with the rotation axis L4. Further, in this state, a part of the sensor stator holding portion 42 and the bearing holding portion 43 formed so as to protrude toward the bottom portion 11a side of the housing case 11 are arranged on the radially inner side of the conductive plate 27 (terminal) It is located inside the holder 25). Furthermore, in the same state, the outer peripheral surface 41 h of each spigot part 41 g is in contact with the inner peripheral surface 11 k in the opening 11 c of the housing case 11.

  The holder plate 41 is formed by pressing a plate material made of a steel material to be the holder plate 41 to form the sensor stator holding portion 42 and the bearing holding portion 43. And the through-hole 43b formed in the bottom part 43a of the bearing holding part 43 is formed by press work, after forming the sensor stator holding part 42 and the bearing holding part 43 by drawing.

  The bearing 15b accommodated in the bearing holding portion 43 is made of a steel material and is an annular ball bearing similar to the bearing 15a. The bearing 15 b is held by the bearing holding portion 43 by having one end surface in the axial direction abutting on the bottom surface of the bearing holding portion 43 and the outer circumferential surface abutting on the inner circumferential surface of the bearing holding portion 43. Yes. The bearing 15b supports the rotary shaft 31 together with the bearing 15a. Specifically, the end of the rotating shaft 31 on the housing case 11 side protrudes outside the space formed by the housing case 11 and the holder plate 41 through the through hole 43b of the holder plate 41, and the bearing 15b The part which protruded outside in the rotating shaft 31 is supported rotatably.

  The sensor stator 51 accommodated in the sensor stator holding part 42 constitutes a resolver 53 as a rotation detection sensor together with a sensor rotor 52 fixed to the rotating shaft 31.

The sensor rotor 52 is formed in an annular shape by laminating a plurality of magnetic steel plates, and is fixed at a position facing the sensor stator 51 in the radial direction on the rotary shaft 31.
The sensor stator 51 includes an annular sensor core 51a and a plurality of resolver windings 51b wound around the sensor core 51a. The sensor core 51a is formed by laminating a plurality of magnetic steel plates, and a plurality of teeth (not shown) arranged in the circumferential direction are formed on the outer periphery thereof. The sensor core 51a is formed so that its outer diameter is equal to the inner diameter of the sensor stator holding portion 42 on the opening side, and its axial length is equal to the outer diameter of the sensor stator holding portion 42 on the opening side. It is formed approximately equal to the axial length of the larger part. The sensor core 51a is provided with an insulating insulator 51c that covers portions other than the inner and outer peripheral surfaces of the sensor core 51a, and the resolver winding 51b from above the insulator 22. Is wound. The resolver winding 51b is a two-phase output that outputs a one-phase excitation winding to which an excitation voltage is applied and a rotation detection signal having different phases according to the rotation of the sensor rotor 52 based on the excitation of the excitation winding. The sensor core 51a is wound around teeth at predetermined positions.

  Such a sensor stator 51 is accommodated in the sensor stator holding portion 42 in a state where the outer peripheral surface of the sensor core 51 a is in contact with the inner peripheral surface of the sensor stator holding portion 42, and the sensor stator holding portion 42. Is held immovable in the circumferential direction and the axial direction. Further, since the sensor stator holding portion 42 and the bearing holding portion 43 are formed so that the central axes L2 and L3 thereof coincide with each other, an annular sensor stator 51 accommodated in the sensor stator holding portion 42, The center axis of the annular bearing 15b accommodated in the bearing holding portion 43 coincides with that of the annular bearing 15b. The sensor stator 51 and the bearing 15b are accommodated and held in the sensor stator holding portion 42 and the bearing holding portion 43, respectively, so that they are aligned in the axial direction. In the present embodiment, a slight gap is formed between the sensor stator 51 and the bearing 15b and is not in contact with each other.

  A cover plate 61 that substantially closes the opening of the sensor stator holding portion 42 is fixed to the holder plate 41. An insertion hole 61a through which the end of the rotating shaft 31 on the housing case 11 side is inserted is formed at the center of the cover plate 61, and the end of the rotating shaft 31 on the housing case 11 side is formed through the insertion hole. It protrudes out of the sensor stator holding part 42 from 61a.

  As shown in FIG. 7, the motor 2 configured as described above includes a gear housing that houses the speed reduction mechanism 5 via a circuit housing portion 72 that houses a drive circuit 71 that controls energization of the stator 12. 81 is fixed.

  The circuit accommodating portion 72 has a hollow, substantially rectangular parallelepiped shape, and the drive circuit 71 is accommodated therein. A predetermined conductive plate 27 among the plurality of conductive plates 27 is electrically connected to the drive circuit 71, and the resolver 53 is electrically connected. The housing case 11 is fixed to the circuit housing portion 72 with the holder plate 41 interposed between the housing case 11 and the circuit housing portion 72. More specifically, the housing case 11 is disposed with respect to the circuit housing portion 72 such that the holder plate 41 fixed to the housing case 11 is brought into contact with a predetermined position of the circuit housing portion 72. That is, the circuit accommodating portion 72 and the holder plate 41 are arranged so as to be adjacent in the axial direction. In this state, the motor fixing screw 91 is inserted from the housing case 11 side into the four screw insertion holes 11h formed in the housing side flange portion 11d and the four screw insertion holes 41f formed in the plate side flange portion 41c. The housing case 11 is fixed to the circuit housing portion 72 by screwing the motor fixing screws 91 to the circuit housing portion 72. That is, the holder plate 41 is fastened and fixed to the circuit housing portion 72 by a motor fixing screw 91 for fixing the housing case 11 to the circuit housing portion 72. As shown in FIG. 8A, in a state where the housing case 11 is fixed to the circuit housing portion 72, the circuit housing portion 72 has an outer circumferential circle of the housing side flange portion 11 d when viewed from the axial direction of the motor 2. Is in the square-shaped range A inscribed.

  As shown in FIG. 7, the gear housing 81 includes a fixing portion 82 for fixing the gear housing 81 to the circuit housing portion 72, and a worm shaft housing portion 84 formed integrally with the fixing portion 82. The worm shaft housing portion 84 and the wheel housing portion 86 for housing the worm wheel 85 formed integrally with the worm shaft housing portion 84.

  The fixing portion 82 has an annular plate shape whose outer diameter is substantially equal to the outer diameter of the housing-side flange portion 11d. As shown in FIG. 8B, insertion portions 82a projecting radially outward are formed at a plurality of locations (four locations in the present embodiment) in the circumferential direction of the fixing portion 82. Each has a screw insertion hole 82b. When the gear housing 81 is viewed from the axial direction, a circle C1 passing through the centers of the four screw insertion holes 82b is a circle C2 passing through the centers of the four screw insertion holes 11h formed in the housing side flange portion 11d (see FIG. 8 (a)), the diameter thereof is smaller than that of the first embodiment.

  As shown in FIG. 7, the worm shaft housing portion 84 has a substantially bottomed cylindrical shape extending along the axial direction of the motor 2, and the speed reduction mechanism 5 is configured inside the worm shaft housing portion 84. A worm shaft 83 is accommodated. One end of the worm shaft 83 on the motor 2 side is connected to the rotary shaft 31 by a joint 87 and can rotate integrally with the rotary shaft 31.

  The wheel housing portion 86 is formed on the side of the worm shaft housing portion 84 and has a circular shape when viewed from the radial direction of the motor 2. A worm wheel 85 that constitutes the speed reduction mechanism 5 together with the worm shaft 83 is rotatably accommodated in the wheel accommodating portion 86. The internal space of the wheel housing portion 86 and the internal space of the worm shaft housing portion 84 are connected at the central portion in the axial direction of the worm shaft housing portion 84, and the worm wheel 85 in the wheel housing portion 86 and the worm shaft The worm shaft 83 in the accommodating portion 84 meshes with a portion where two internal spaces are connected. The worm wheel 85 is connected to the steering shaft 4.

  The gear housing 81 configured as described above has the fixed portion 82 in contact with a predetermined portion of the circuit housing portion 72 opposite to the side on which the housing case 11 is fixed. The housing fixing screws 92 are respectively inserted into the four screw insertion holes 82 b, and the housing fixing screws 92 are fixed to the circuit housing portion 72 by being screwed to the circuit housing portion 72. At this time, as shown in FIGS. 8A and 8B, a circle C1 passing through the centers of the four screw insertion holes 82b when viewed from the axial direction (axial direction of the housing case 11) is Since the diameter is smaller than the circle C2 passing through the center of the four screw insertion holes 11h formed in the flange portion 11d, the center (axial direction) of the housing fixing screw 92 inserted in the screw insertion hole 82b. The circle passing through the center of the motor fixing screw 91 inserted through the screw insertion hole 11h (ie, the center viewed from the axial direction) (ie, the circle C2) passes through the circle passing through the screw insertion hole 11h. Has a small diameter.

  In the motor 2 configured as described above, when the rotor 13 is rotated by energizing a predetermined armature coil 23, the sensor rotor 52 rotates together with the rotating shaft 31. The resolver 53 outputs a rotation detection signal corresponding to the rotation state of the sensor rotor 52, that is, the rotation state of the rotor 13, to the drive circuit 71. The drive circuit 71 controls energization to the armature coil 23 based on the rotation detection signal input from the resolver 53. The rotation of the rotary shaft 31 is transmitted to the worm shaft 83 and decelerated by the worm shaft 83 and the worm wheel 85.

As described above, according to the present embodiment, the following operational effects are obtained.
(1) Since the holder plate 41 is made of a steel material like the other bearing 15b, the linear expansion coefficient of the holder plate and the bearing 15b is substantially the same. As a result, when the motor 2 becomes high temperature, it is possible to prevent a gap from being generated between the holder plate 41 and the outer peripheral surface of the other bearing 15b. As a result, it is possible to suppress the occurrence of vibration and abnormal noise in the motor 2.

  (2) The holder plate 41 that holds the bearing 15b and the sensor stator 51 is formed of a plate material made of a steel material. Therefore, since the holder plate (end frame) is not formed using an aluminum material as in the prior art, the holder plate 41 does not have to be formed thick in the axial direction to ensure strength. As a result, the axial size of the motor 2 can be reduced by reducing the thickness of the holder plate 41 in the axial direction. The sensor stator 51 is directly fixed to the holder plate 41 that holds the bearing 15b. Therefore, since the center axis of the bearing 15b and the center axis of the sensor stator 51 are likely to coincide with each other, the center axis of the sensor rotor 52 fixed to the rotary shaft 31 supported by the bearing 15b and the sensor stator It becomes easy to match the central axis line of. Furthermore, the bearing holding portion 43 for accommodating and holding the bearing 15b and the sensor stator holding portion 42 for accommodating and holding the sensor stator are pressed from one direction along the axial direction with respect to the plate material to be the holder plate 41. It is formed by applying. Therefore, in order to form the bearing holding portion 43 and the sensor stator holding portion 42, once the plate material to be the holder plate 41 is fixed to a machine tool that performs press working, the bearing holding portion 43 and the sensor stator holding portion are formed. 42 can be formed. Accordingly, the center axis L3 of the bearing holding portion 43 and the center axis L2 of the sensor stator holding portion 42 are suppressed from shifting, and the center axis of the bearing 15b accommodated in the bearing holding portion 43 and the sensor stator holding portion 42 are accommodated. Deviation from the center axis of the sensor stator 51 is suppressed. From these things, the fall of the detection accuracy of the resolver 53 can be suppressed.

  (3) Among the plurality of armature coils 23 provided in the stator 12, the plurality of conductive plates 27 that respectively electrically connect the end portions 23a of the predetermined armature coils 23 are radially in the plate thickness direction. Are arranged in a ring so as to coincide with. As described above, when the conductive plate 27 is arranged in an annular shape so that the thickness direction thereof coincides with the radial direction, a space required for the arrangement of the conductive plate 27 is reduced in the radial direction, and a plurality of conductive plates arranged in the annular shape are arranged. A space is created on the radially inner side of the plate 27. A bearing holding portion 43 and a part of the sensor stator holding portion 42 formed so as to protrude from the opening portion 11c side of the housing case 11 toward the bottom portion 11a side are arranged in a space inside the conductive plate 27 in the radial direction. Therefore, the motor 2 can be further reduced in the axial direction.

  (4) The inlay portion 41g has an outer peripheral surface 41h positioned on a circle having the center O1 of the holder plate 41 as the center and a diameter equal to the inner diameter of the opening 11c of the housing case 11 when viewed from the axial direction. Is formed. Accordingly, the holder plate 41 is fixed to the housing case 11 so that the outer peripheral surface 41h of the spigot portion 41g contacts the inner peripheral surface 11k of the opening 11c of the housing case 11, whereby the holder plate 41 and the housing plate 41 are fixed. The case 11 can be in a coaxial state with higher accuracy. Therefore, the bearing 15a disposed at the center of the bottom 11a of the housing case 11 and the bearing 15b accommodated in the bearing holding portion 43 of the holder plate 41 are coaxial with higher accuracy. As a result, the center axis of the sensor rotor 52 fixed to the rotating shaft 31 supported by the two bearings 15 a and 15 b and the sensor stator 51 accommodated in the sensor stator holding portion 42 formed on the holder plate 41. It becomes easier to match the central axis of the. Therefore, it is possible to further suppress a decrease in detection accuracy of the resolver 53.

  (5) Since the holder plate 41 that holds the bearing 15b and the sensor stator 51 is thinned in the axial direction as compared with the conventional case, the circuit accommodating portion 72 is arranged so as to be aligned with the holder plate 41 in the axial direction. As a result, the motor 2 can be prevented from being enlarged in the axial direction and can be reduced in the radial direction.

  (6) The housing case 11 in which the stator 12 and the rotor 13 are accommodated is fixed to the gear housing 81 via the circuit accommodating portion 72. In general, when the housing case 11 is directly fixed to the gear housing 81, a portion of the gear housing 81 where the housing case 11 is fixed (for example, the fixing portion 82) is matched to the outer diameter of the housing side flange portion 11d. It gets bigger. Therefore, as in the present embodiment, the housing case 11 is fixed to the gear housing 81 via the circuit accommodating portion 72, whereby the motor 2 (the stator 12 and the rotor 13 are accommodated in the gear housing 81). It is possible to make the size of the portion to which the housing case 11 and the circuit accommodating portion 72 in which the drive circuit 71 is accommodated fixed is smaller than the outer diameter of the housing side flange portion 11d. That is, it is possible to reduce the size of the portion of the gear housing 81 where the motor 2 is fixed.

  Furthermore, in this embodiment, since the diameter of the circle C1 passing through the centers of the four housing fixing screws 92 is smaller than the diameter of the circle C2 passing through the centers of the four motor fixing screws 91, the motor 2 is fixed in the gear housing 81. The size of the fixed portion 82 in the radial direction can be set to a size equal to or smaller than the outer diameter of the housing side flange portion 11d.

  (7) Since the circuit accommodating portion 72 has a size that fits within the square range A in which the outer peripheral circle of the housing side flange portion 11d is inscribed as viewed from the axial direction of the motor 2, Increase in size is suppressed.

(8) Since the bearing 15b and the sensor stator 51 are directly fixed to the holder plate 41, an increase in the number of parts can be suppressed.
(9) The holder plate 41 is fixed to the housing case 11 by caulking the caulking pins 11e. Therefore, the holder plate 41 can be easily fixed to the housing case 11.

  (10) The holder plate 41 is fastened and fixed to the circuit housing portion 72 by a motor fixing screw 91 for fixing the housing case 11 to the circuit housing portion 72. Therefore, the strength of the plate-shaped holder plate 41 is ensured.

  (11) The holder plate 41 is formed by pressing a plate made of a steel material to be the holder plate 41 to form the sensor stator holding portion 42 and the bearing holding portion 43. Therefore, by forming the press die for forming the sensor stator holding portion 42 and the bearing holding portion 43 with high accuracy, the sensor stator holding portion 42 and the bearing holding portion 43 formed using the press die can be easily formed. It can be coaxial.

  (12) Since the holder plate 41 is formed with the sensor stator holding portion 42, the bearing holding portion 43, and the spigot portion 41g in one member, the sensor stator holding portion 42, the bearing holding portion 43, and the spigot portion 41g are coaxial. Easy to form. Therefore, by using the holder plate 41, the coaxiality between the rotor 13 and the sensor stator 51 is improved, and as a result, the coaxiality between the sensor rotor 52 and the sensor stator 51 is improved. The holder plate 41 is formed by integrally forming a sensor stator holding portion 42, a bearing holding portion 43, and an inlay portion 41 g by pressing a plate material made of a steel material that becomes the holder plate 41. Therefore, by forming the press mold for forming the sensor stator holding portion 42, the bearing holding portion 43, and the spigot portion 41g with high precision, the sensor stator holding portion 42, the bearing holding formed using the press die. The portion 43 and the spigot portion 41g can be more easily made coaxial.

In addition, you may change embodiment of this invention as follows.
In the above embodiment, the circuit housing portion 72 is formed so as to be within the square range A in which the outer peripheral circle of the housing side flange portion 11d is inscribed as viewed from the axial direction of the motor 2. However, the circuit housing portion 72 may be formed so as to have a size larger than the range A when viewed from the axial direction of the motor 2.

  In the above embodiment, the fixing portion 82 is formed such that the diameter of the circle C1 passing through the centers of the four housing fixing screws 92 is smaller than the diameter of the circle C2 passing through the centers of the four motor fixing screws 91. Yes. However, the fixing portion 82 may be formed so that the diameter of the circle C1 is the same as the diameter of the circle C2. Even if it does in this way, the effect similar to (5) of the said embodiment can be acquired. Further, the fixing portion 82 may be formed such that the diameter of the circle C1 is larger than the diameter of the circle C2.

  In the above embodiment, the circuit housing part 72 is arranged at a position aligned with the holder plate 41 in the axial direction, but the arrangement position of the circuit housing part 72 is not limited to this. For example, the circuit housing portion 72 may be disposed at a position aligned with the housing case 11 in the radial direction. In this case, the housing case 11 to which the holder plate 41 is fixed is directly fixed to the gear housing 81.

-Although the holder plate 41 of the said embodiment is provided with the spigot part 41g, the structure which is not provided with the spigot part 41g may be sufficient.
In the above embodiment, the bearing holding portion 43 and a part of the sensor stator holding portion 42 are arranged in the space inside the conductive plate 27 in the radial direction. However, at least a part of the bearing holding portion 43 and the sensor stator holding portion 42 may be arranged in the space inside the conductive plate 27 in the radial direction. For example, in the space on the radially inner side of the conductive plate 27, only at least part of the bearing holding part 43 may be arranged, or only at least part of the sensor stator holding part 42 may be arranged. If it does in this way, the effect similar to (2) of the said embodiment can be acquired. Further, the bearing holding portion 43 and the sensor stator holding portion 42 do not have to be arranged in the space on the radially inner side of the conductive plate 27. In this case, the shape and arrangement of the conductive plate 27 are not limited to those of the above embodiment.

  In the above embodiment, the sensor stator holding portion 42 and the bearing holding portion 43 are formed so as to protrude toward the bottom portion 11 a side of the housing case 11, but protrude to the opposite side to the bottom portion 11 a of the housing case 11. It may be formed as follows.

  In the above embodiment, the holder plate 41 is fixed to the housing case 11 by caulking the caulking pin 11e. However, the holder plate 41 may be fixed to the housing case 11 by welding or screwing other than caulking.

  In the above embodiment, the holder plate 41 is fastened and fixed to the circuit housing portion 72 by the motor fixing screw 91. However, if the holder plate 41 is fixed to the housing case 11, the holder plate 41 may not be fixed together with the circuit housing portion 72.

  In the embodiment described above, the holder plate 41 is formed by pressing the plate material made of a steel material to be the holder plate 41 to form the sensor stator holding portion 42 and the bearing holding portion 43. However, if the holder plate 41 is processed by pressing a plate material made of a steel material to be the holder plate 41 in one direction of the plate thickness direction (corresponding to the axial direction) of the plate material, the holder plate 41 is subjected to deep drawing processing. The sensor stator holding part 42 and the bearing holding part 43 may be formed. Further, the holder plate 41 may be formed by a method other than press working.

  In the above embodiment, since the outer diameters of the bearing 15b held by the holder plate 41 and the sensor stator 51 are different, the inner diameters of the sensor stator holding part 42 and the bearing holding part 43 are different from each other. However, the size of the sensor stator holding portion 42 and the bearing holding portion 43 may be set according to the outer diameter of the bearing and sensor stator used in the motor 2. For example, when the outer diameters of the bearing used for the motor 2 and the sensor stator are equal, the sensor stator holding part 42 and the bearing holding part 43 are formed to have the same inner diameter.

  In the above embodiment, the housing case 11 has a bottomed cylindrical shape in which the bottom portion 11a is integrally formed. However, the housing case 11 has a bottomed cylindrical shape by forming a bottom part 11a and a cylindrical part (referred to as a cylindrical part) separately and fixing the bottom part 11a to one end of the cylindrical part. There may be.

  In the above-described embodiment, the present invention has been described as being embodied in the electric power steering apparatus motor 2 provided in the column type electric power steering apparatus 1. However, the present invention may be applied to a brushless motor other than the motor 2 provided in the column type electric power steering apparatus 1.

The schematic block diagram of an electric power steering apparatus. The elements on larger scale which show the fixed part of the holder plate with respect to a housing case. Sectional drawing of the motor for electric power steering devices. The perspective view of a housing case and a holder plate. Sectional drawing of the motor for electric power steering devices. (A) is a front view of a conductive plate, (b) is a side view of the conductive plate. The front view of the motor for electric power steering apparatuses fixed to the gear housing and this gear housing. (A) And (b) The side view of the motor for electric power steering devices fixed to the gear housing.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Electric power steering apparatus, 2 ... Motor for electric power steering apparatuses as a brushless motor, 11 ... Housing case, 11a ... Bottom part of housing case, 11c ... Opening part of housing case, 11d ... Housing side flange part, 12 ... Fixed Child, 13 ... rotor, 15a ... bearing as one bearing, 15b ... bearing as the other bearing, 23 ... armature coil, 23a ... end of armature coil, 27 ... conductive plate, 31 ... rotating shaft, DESCRIPTION OF SYMBOLS 41 ... Holder plate, 41g ... Inner part, 41h ... Outer peripheral surface, 42 ... Sensor stator holding part as 2nd accommodating part, 43 ... Bearing holding part as 1st accommodating part, 51 ... Sensor stator, 52 ... Sensor Rotor, 53 ... Resolver as rotation detection sensor, 71 ... Drive circuit, 72 ... Circuit housing part, 81 ... Counterpart housing , A motor fixing screw as a first fixing screw, 92 a housing side fixing screw as a second fixing screw, A, a range, C1, a circle as a first circle, C2,. 2 as a circle, L2... Center axis of sensor stator holding portion as second housing portion, L3... Center axis of bearing holding portion as first housing portion, L5... Center axis of holder plate, O1. The center of the holder plate as seen from the axial direction.

Claims (9)

A bottomed cylindrical housing case;
A stator fixed inside the housing case;
A rotor disposed on the inner side of the stator and having a rotation axis;
A pair of annular bearings supporting the rotating shaft;
A rotation for detecting a rotation state of the rotor, comprising a sensor rotor fixed to the rotation shaft and rotating integrally with the rotation shaft, and an annular sensor stator arranged to face the sensor rotor in a radial direction. A detection sensor;
A brushless motor with
One of the pair of bearings is disposed at the bottom of the housing case,
To the opening of the housing case, a plate made of a steel material is fixed with a holder plate that forms a first housing portion and a second housing portion that are aligned in the axial direction and are coaxial.
The other bearing of the pair of bearings is made of a steel material and is housed and held in the first housing portion, the sensor stator is housed and held in the second housing portion, and the other bearing and the sensor stator Is a brushless motor characterized by being adjacent in the axial direction. A bottomed cylindrical housing case;
A stator fixed inside the housing case;
A rotor disposed on the inner side of the stator and having a rotation axis;
A pair of annular bearings supporting the rotating shaft;
A rotation for detecting a rotation state of the rotor, comprising a sensor rotor fixed to the rotation shaft and rotating integrally with the rotation shaft, and an annular sensor stator arranged to face the sensor rotor in a radial direction. A detection sensor;
A brushless motor with
One of the pair of bearings is disposed at the bottom of the housing case,
In the opening of the housing case, a plate material made of a steel material is pressed from one direction along the axial direction, and a first accommodating portion and a second accommodating portion that are aligned in the axial direction and have a coaxial shape are provided. The formed holder plate is fixed,
Of the pair of bearings, the other bearing is housed and held in the first housing portion, the sensor stator is housed and held in the second housing portion, and the other bearing and the sensor stator are adjacent in the axial direction. Brushless motor characterized by fit. The brushless motor according to claim 1 or 2,
The stator has a plurality of armature coils, and an end of the stator on the opening side of the housing case has a conductive and curved band shape, and the end of the predetermined armature coil A plurality of conductive plates that electrically connect the parts to each other are arranged in an annular shape so that the plate thickness direction coincides with the radial direction,
The first accommodating portion and the second accommodating portion protrude from the opening side of the housing case toward the bottom side, and at least a part of the first and second accommodating portions is the conductive plate. A brushless motor, which is arranged on the inner side in the radial direction. The brushless motor according to any one of claims 1 to 3,
One of the bearings is disposed at the center of the bottom of the housing case,
The first housing portion and the second housing portion are formed such that the center axis thereof coincides with the center axis of the holder plate,
The holder plate extends toward the housing case along the axial direction, and has an outer periphery on a circle having a diameter equal to the inner diameter of the opening of the housing case with the center of the holder plate as the center when viewed from the axial direction. A brushless motor having an inlay portion on which a surface is located. The brushless motor according to any one of claims 1 to 4,
A circuit housing portion that houses a drive circuit that controls energization of the stator based on a rotation detection signal corresponding to a rotation position of the rotor output by the rotation detection sensor;
The brushless motor, wherein the circuit housing portion is disposed at a position adjacent to the holder plate in the axial direction. The brushless motor according to claim 5,
The housing case has a housing-side flange portion extending radially outward at an opening of the housing case, and the plurality of locations in the circumferential direction of the housing-side flange portion are screwed with a first fixing screw to thereby form the circuit housing portion. Fixed to
A brushless motor characterized in that a plurality of circumferential positions in a mating housing for fixing the brushless motor are screwed to the circuit housing portion by a second fixing screw that is screwed from the mating housing side. . The brushless motor according to claim 6,
As viewed from the axial direction, the diameter of the first circle passing through the centers of the plurality of second fixing screws is smaller than the diameter of the second circle passing through the centers of the plurality of first fixing screws. A brushless motor characterized by that. The brushless motor according to claim 6 or 7,
The brushless motor, wherein the circuit housing portion is within a square range in which an outer peripheral circle of the housing side flange portion is inscribed as viewed in the axial direction. The brushless motor according to any one of claims 1 to 8,
A brushless motor, which is a motor for an electric power steering device provided in an in-vehicle electric power steering device.

Images