JP2006295996A - Brush-less motor and electric power steering device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brush-less motor with simple structure capable of easily setting the circumferential position of a sensor stator to an optimum position. <P>SOLUTION: In the brush-less motor, the sensor stator 22 is assembled with respect to an endless plate 12 so that a sensor connector 27 is disposed in a position facing (corresponding to) the wiring insertion hole 28, to be pressed and fixed thereon with a clamp plate 34 fastened to the end plate 12. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a brushless motor in which a resolver as a rotation angle sensor is previously incorporated in a motor case, and an electric power steering apparatus including the brushless motor.

  When driving a brushless motor, in order to obtain smooth rotation and smooth output characteristics, so-called sine wave drive in which sine wave AC voltages having different phases are applied to the motor coils of each phase is indispensable. A rotation angle sensor used for control is also required to have higher accuracy.

  Therefore, in such applications, it is common to use a resolver capable of analog detection of the rotation angle as the rotation angle sensor. Conventionally, a resolver as such a rotation angle sensor is previously installed in a motor case in a brassless motor. (For example, refer to Patent Document 1).

  By the way, the resolver detects the rotation angle of the rotor (rotating shaft) in an analog manner based on the relative rotation between the sensor rotor and the sensor stator. Therefore, when assembling the sensor rotor, it is necessary to accurately set the circumferential positional relationship between the sensor rotor and the sensor stator.

  In view of this point, in the above-described conventional brushless motor, the sensor stator is loosely fitted in a circular housing recess formed on the inner side of the motor end plate. Protruding protrusions are provided. Further, the motor end plate is provided with a pair of adjustment bolts for clamping the protrusion from both sides in the circumferential direction in the assembled state. The sensor stator is slidable in the circumferential direction in the temporarily assembled state (temporary state) by being sandwiched between the motor end plate and a fixing member fastened to the motor end plate. It is pressed and fixed to.

With such a configuration, it is possible to finely adjust the circumferential position of the sensor stator by changing the tightening balance of the two adjusting bolts, and when the fastening of the fixing member is loosened due to vibration of the motor or the like. However, the circumferential position does not shift. Therefore, the circumferential position of the sensor stator can be set with high accuracy and high reliability can be ensured.
JP 2003-32989 A

  However, since the conventional brushless motor has a configuration in which the sensor stator is directly sandwiched between the two adjusting bolts, the function of the resolver as the rotation angle sensor may be deteriorated. In addition, the configuration becomes complicated by providing these adjustment bolts, and it is necessary to take measures against water exposure by forming through holes for supporting each adjustment bolt in the motor radial direction, resulting in an increase in manufacturing cost. There is a problem of inviting.

  The present invention has been made in order to solve the above-mentioned problems, and has an object of simple construction and a brassless motor capable of easily setting the circumferential position of the sensor stator to an optimum position and reliability. An object of the present invention is to provide an electric power steering device with high power.

  In order to solve the above problems, the invention according to claim 1 is a resolver comprising a sensor rotor that rotates integrally with a motor rotating shaft, and an annular sensor stator that is fixed to the motor case and disposed outside the sensor rotor. The sensor stator is loosely fitted in a housing recess formed inside the end plate that closes the opening of the motor case body, and is sandwiched between a fixing member fastened to the end plate. Accordingly, the brushless motor is pressed and fixed to the end plate, and the end plate is formed with a wiring insertion hole for inserting a wiring, and the sensor stator has a circumferential position of the sensor stator. The gist of the invention is that a position adjusting means operable via the wiring insertion hole is provided to be changed.

The gist of the invention described in claim 2 is that the position adjusting means is a protrusion or a recess provided in the sensor stator.
The invention according to claim 3 is characterized in that the position adjusting means is a connector portion that protrudes radially outward from the outer periphery of the sensor stator and in which the connection terminal of the sensor stator is embedded. And

  According to a fourth aspect of the present invention, the fixing member is fastened by a fastening screw that is screwed into a screw hole formed in the end plate, and a distal end portion of the fastening screw is interposed through the screw hole. The gist is that a concavity for fastening that can be fastened is formed.

  According to a fifth aspect of the present invention, the fixing member has a long hole extending along the circumferential direction and is fastened by a fastening screw inserted through the long hole, and the fixing member, the sensor stator, The gist of the present invention is to include a locking means that locks the ring in a circumferential direction so as not to be relatively movable.

  According to a sixth aspect of the present invention, the locking means is engaged with an engagement protrusion that is engaged with an engagement recess formed in the sensor stator or an engagement protrusion formed on the sensor stator. The gist of the present invention is that the engaging recess is made.

The gist of the invention described in claim 7 is that the bearing that pivotally supports the rotating shaft is provided on the outer side in the axial direction than the housing recess.
According to an eighth aspect of the present invention, there is provided a resolver including a sensor rotor that rotates integrally with a motor rotating shaft and an annular sensor stator that is fixed to the motor case and disposed outside the sensor rotor. It is loosely fitted in a housing recess formed inside the end plate that closes the opening of the case body, and is fixed to the end plate by being sandwiched between a fixing member fastened to the end plate. The fixed member has a long hole extending in the circumferential direction and is fastened by a fastening screw inserted through the long hole, and in the circumferential direction with respect to the sensor stator. The end plate is locked so as not to be relatively movable, and the end plate is formed with a wiring insertion hole for inserting a wiring, and the fixing member Is that said fixing member and the sensor stator circumferential position operable position adjusting means via the wiring insertion hole so as to change the is provided, and the gist.

  The invention according to claim 9 includes a resolver including a sensor rotor that rotates integrally with the motor rotation shaft and an annular sensor stator that is fixed to the motor case and disposed outside the sensor rotor. The motor case is press-fixed to the motor case by being loosely fitted in an accommodation recess formed inside the axial end surface of the motor case and sandwiched between a fixing member fastened to the axial end surface of the motor case. The motor case is formed with a wiring insertion hole for inserting a wiring, and the sensor stator is provided with the wiring insertion hole to change the circumferential position of the sensor stator. The gist of the present invention is that a position adjusting means that can be operated is provided.

The gist of the invention described in claim 10 is an electric power steering device including the brushless motor according to any one of claims 1 to 9.
(Function)
According to the first to third aspects of the invention, in a state where the fastening force of the fixing member is weak, that is, in the temporarily assembled state, the sensor stator is slid (rotated) in the circumferential direction, that is, the circumferential position is adjusted. The adjustment can be performed from the outside of the end plate by operating the position adjusting means via the wiring insertion hole. Therefore, the circumferential position of the sensor stator can be easily set to the optimum position with a simple configuration. In particular, in the configuration of the third aspect, the connector portion of the sensor stator is provided with a function as a position adjusting means, so that further simplification can be achieved. Further, normally, the wiring insertion hole is liquid-tightly sealed by a grommet fitted into the wiring insertion hole, so that it is not necessary to take in foreign matters or take special measures against moisture. Further, unlike the conventional example, since a direct load is not applied to the sensor stator, the function of the resolver as the rotation angle sensor is not deteriorated.

  According to the fourth aspect of the present invention, the fastening screw can be tightened or retightened from the outside of the end plate through the screw hole, that is, the fastening operation can be performed. Therefore, even after the brushless motor is assembled, the circumferential position of the sensor stator can be set from the outside of the motor case to the optimum position including the components constituting the brushless motor and assembly errors.

  According to the fifth and sixth aspects of the invention, the sensor stator (and the fixing member) can be moved relative to the end plate in the circumferential direction in the temporarily assembled state, while the fixing member is relatively moved in the circumferential direction. It can be locked immovably. Therefore, it is possible to stably detect the rotation angle with high accuracy while preventing the idling of the sensor stator due to vibration or the like while ensuring the ease of positioning. Also, forming the screw holes for fastening on the end plate side facilitates the processing, and the screw holes are sealed with the fastening screws, so that it is necessary to take in foreign matter or take special measures against water immersion. There is an advantage that there is no.

  According to the seventh aspect of the present invention, since the vibration of the rotating shaft caused by the output load is difficult to be transmitted to the sensor rotor, it is possible to stably detect the rotation angle with high accuracy while preventing the detection accuracy from being lowered due to the vibration. Can do.

  According to the eighth aspect of the present invention, the circumferential position of the sensor stator can be adjusted without applying excessive stress to the sensor stator, its connector portion, and the connection terminal embedded in the connector portion.

  According to the ninth aspect of the present invention, it is possible to slide (rotate) the sensor stator in the circumferential direction, that is, to adjust the circumferential position in a state where the fastening force of the fixing member is weak, that is, in the temporarily assembled state. The adjustment can be performed from the outside of the motor case by operating the position adjusting means through the wiring insertion hole. Therefore, the circumferential position of the sensor stator can be easily set to the optimum position with a simple configuration. Further, normally, the wiring insertion hole is liquid-tightly sealed by a grommet fitted into the wiring insertion hole, so that it is not necessary to take in foreign matters or take special measures against moisture. Further, unlike the conventional example, since a direct load is not applied to the sensor stator, the function of the resolver as the rotation angle sensor is not deteriorated.

  According to the invention described in claim 10, by adopting a brushless motor equipped with a resolver capable of detecting a rotation angle with high accuracy, low vibration and low noise can be realized, and motor performance is deteriorated due to entry of foreign matter or water immersion. Therefore, it is possible to ensure high reliability.

  According to the present invention, it is possible to provide a brassless motor and a highly reliable electric power steering device that are simple in configuration and can easily set the circumferential position of the sensor stator to the optimum position.

Hereinafter, an embodiment in which the present invention is embodied in a brushless motor for an electric power steering apparatus will be described with reference to the drawings.
1 is a plan view of the brushless motor of the present embodiment, FIG. 2 is a cross-sectional view of the brushless motor along the A-O-B cross section, and FIG. 3 is a bottom view of the end plate in which the sensor stator and the compression plate are assembled. It is.

  As shown in FIG. 2, the brushless motor 1 of the present embodiment includes an annular stator 4 having a plurality of teeth 3 around which a motor coil 2 is wound, and a rotating shaft 5 that is disposed inside the stator 4 and integrated with the rotating shaft 5. A rotating rotor 6 and a resolver 7 as a rotation angle sensor for detecting the rotation angle of the rotation shaft 5 are provided.

  The motor case 10 of this embodiment includes a motor case main body 11 formed in a bottomed cylindrical shape and an end plate 12 that closes an opening 11 a of the motor case main body 11, and the stator 4 is a motor case main body 11. The rotating shaft 5 is rotatably supported by bearings 13 and 14 provided on the bottom 11b of the motor case main body 11 and the end plate 12. The rotor 6 is disposed inside the stator 4 by being fixed to the rotating shaft 5.

  The brushless motor 1 of the present embodiment is a surface magnet type synchronous motor (SPM) in which a magnet (not shown) is arranged on the outer peripheral surface of a rotor 6, and the rotor 6 is a motor of each phase (U, V, W). When the three-phase drive power is supplied to the coil 2, the coil 2 rotates together with the rotary shaft 5. In the present embodiment, the end plate 12 is provided with a power supply unit 16 (see FIG. 1), and three-phase drive power generated by a PWM inverter (not shown) is passed through the power supply unit 16. Are supplied to the motor coil 2 of each phase.

  On the other hand, the resolver 7 includes a sensor rotor 21 that is fixed to the rotating shaft 5 and rotates integrally with the rotating shaft 5, and an annular sensor stator 22 that is fixed to the motor case 10 and disposed outside the sensor rotor 21. ing.

  As shown in FIGS. 4A and 4B, in this embodiment, the sensor rotor 21 is formed by laminating magnetic steel plates, and includes an annular portion 23 and a plurality of teeth 24 provided on the annular portion 23. And a sensor coil 25 wound around the tooth 24. In this embodiment, the tooth 24 (and the sensor rotor 21) of the sensor stator 22 has a one-phase excitation coil to which an excitation voltage is applied as the sensor coil 25, and an output signal corresponding to the rotation of the sensor rotor 21. The two-phase (sin phase, cos phase) output coils that respectively output are wound around predetermined positions (not shown).

  In the present embodiment, the sensor stator 22 has a sensor connector 27 in which the connection terminal 26 of the sensor coil 25 is embedded, and the sensor connector 27 extends radially outward from the outer periphery of the annular portion 23 of the sensor stator 22. It protrudes toward you. As shown in FIG. 2, the end plate 12 has a wiring insertion hole 28, and the sensor stator 22 is disposed at a position where the sensor connector 27 faces (corresponds to) the wiring insertion hole 28. Thus, it is fixed to the end plate 12 (see FIG. 3). Then, the signal wiring 29 inserted into the wiring insertion hole 28 and the sensor connector 27 are connected, whereby the sensor coil 25 of the sensor stator 22 is connected to a control device (not shown). Thus, the rotation angle of the rotating shaft 5 that rotates integrally with the sensor rotor 21 can be detected based on the change in the output signal of each phase accompanying the rotation of the sensor rotor 21. In this embodiment, the signal wiring 29 is formed by integrally covering the output signal line corresponding to the output coil and the exciting current supply line corresponding to the exciting coil, and the connection plug 29a provided at the tip is connected to the sensor connector. 27 is connected to the sensor connector 27. The wiring insertion hole 28 is liquid-tightly sealed with a grommet 30 fitted into the wiring insertion hole 28.

Next, the resolver fixing structure in the brushless motor of this embodiment will be described.
As shown in FIG. 2, in this embodiment, the inner surface 12 a of the end plate 12 is formed with a circular accommodation recess 32 concentrically with the insertion hole 31 through which the rotary shaft 5 is inserted and the bearing 14. The stator 22 is loosely fitted in the receiving recess 32 so as to be rotatable. Specifically, a step portion 33 is formed on the outer peripheral edge of the housing recess 32, and the sensor stator 22 is configured such that the annular portion 23 (see FIGS. 4A and 4B) contacts the step portion 33. Are accommodated in the accommodating recess 32. In the present embodiment, the bearing 14 on the end plate 12 side is provided on the outer side in the axial direction than the housing recess 32. The rotating shaft 5 has an output end on the end plate 12 side.

  Further, an elastic plate 34 as a fixing member for fixing the sensor stator 22 to the end plate 12 is fastened to the inner surface 12 a of the end plate 12. The sensor stator 22 is pressed and fixed to the end plate 12 by the annular portion 23 being sandwiched between the pressure plate 34 and the accommodating recess 32 (the step portion 33 thereof). .

  More specifically, as shown in FIGS. 5A and 5B, the elastic plate 34 is formed in a bottomed cylindrical shape, and an insertion hole through which the rotary shaft 5 is inserted into the bottom 34 b of the elastic plate 34. 35 is formed. Further, a flange portion 37 extending outward in the radial direction is formed at the opening end of the cylindrical portion 36 of the compression plate 34, and a plurality of protrusions projecting radially outward are provided on the outer peripheral edge of the flange portion 37. (Two) fastening portions 38 are provided. In the present embodiment, each fastening portion 38 is formed with a long hole 39 extending along the circumferential direction. As shown in FIG. 6, the bolt 40 as a fastening screw is extended from the motor case main body 11 side. By being inserted into the hole 39, it is screwed into a screw hole 41 formed on the end plate 12 side. The elastic plate 34 is fastened to the inner surface 12 a of the end plate 12 so that the flange portion 37 abuts on the annular portion 23 of the sensor stator 22, and between the flange portion 37 and the step portion 33 of the housing recess 32. The sensor stator 22 is pressed and fixed to the end plate 12 by sandwiching the annular portion 23 of the sensor stator 22.

  In this embodiment, a hexagonal hole 42 as a fastening recess is formed at the tip 40a of the bolt 40, and the bolt 40 is tightened or tightened from the outside of the end plate 12 via the screw hole 41. That is, the fastening operation is possible. 4A and 4B, a plurality of engagement grooves 43 extending along the axial direction are formed on the outer peripheral edge of the annular portion 23 of the sensor stator 22, and FIG. ) (B), the flange portion 37 of the elastic plate 34 is provided with a plurality of engaging claws 44 that are engaged with the engaging grooves 43 at positions corresponding to the engaging grooves 43. Yes. Then, as shown in FIG. 7, in the assembled state to the end plate 12, each of the engagement grooves 43 and each of the engagement claws 44 are engaged, so that the sensor stator 22 is in contact with the compression plate 34. It is locked so as not to be relatively movable in the circumferential direction.

As described above, according to the present embodiment, the following features can be obtained.
(1) The sensor stator 22 is assembled to the end plate 12 so that the sensor connector 27 faces (corresponds to) the wiring insertion hole 28, and the elastic plate is fastened to the end plate 12. 34 is pressed and fixed.

  With such a configuration, the sensor stator 22 is slid (rotated) in the circumferential direction in a state where the fastening force of each bolt 40 for fastening the compression plate 34 is weak, that is, in a temporarily assembled state, that is, at the circumferential position. The adjustment can be performed, and the adjustment can be performed from the outside of the end plate 12 by operating the sensor connector 27 via the wiring insertion hole 28. Accordingly, the circumferential position of the sensor stator 22 can be easily set to the optimum position with a simple configuration. It goes without saying that the sensor stator 22 is fixed relative to the end plate 12 so as not to rotate relative to the end plate 12 by tightening the bolt 40 and increasing its fastening force. Moreover, since the wiring insertion hole 28 is liquid-tightly sealed by the grommet 30 fitted in the wiring insertion hole 28, it is not necessary to take special measures against water. Further, unlike the conventional example, since a direct load is not applied to the sensor stator, the function of the resolver as the rotation angle sensor is not deteriorated.

  (2) The elastic plate 34 is fastened to the end plate 12 by a bolt 40 that is screwed into a fastening hole 45 formed in the end plate 12. And the hexagonal hole 42 as a recessed part for fastening is formed in the front-end | tip part 40a of the volt | bolt 40. As shown in FIG.

  With such a configuration, the bolt 40 can be tightened or retightened from the outside of the end plate 12 via the screw hole 41, that is, a fastening operation can be performed. Accordingly, even after the brushless motor 1 is assembled, the circumferential position of the sensor stator 22 can be set from the outside of the motor case 10 to the optimum position including the components constituting the brushless motor 1 and assembly errors. it can.

  (3) Each fastening portion 38 of the elastic plate 34 is formed with a long hole 39 extending in the circumferential direction, and each bolt 40 is inserted into the long hole 39, whereby each screw on the end plate 12 side. It is screwed into the hole 41. Then, the engagement plate 43 and the sensor stator 22 cannot be relatively moved in the circumferential direction by engaging the engagement grooves 43 formed in the sensor stator 22 and the engagement claws 44 formed in the compression plate 34. Lock to.

  With such a configuration, the sensor stator 22 (and the compression plate 34) can be moved relative to the end plate 12 in the circumferential direction in a temporarily assembled state, while relative movement in the circumferential direction is performed with respect to the compression plate 34. It can be locked impossible. Therefore, it is possible to stably detect the rotation angle with high accuracy while preventing the idling of the sensor stator 22 due to vibration or the like while ensuring the ease of positioning.

  (4) The bearing 14 on the end plate 12 side is provided on the outer side in the axial direction than the housing recess 32. With such a configuration, the vibration of the rotating shaft 5 due to the output load is difficult to be transmitted to the sensor rotor 21, so that it is possible to prevent the detection accuracy from being lowered due to the vibration and stably detect the rotation angle.

In addition, you may change each said embodiment as follows.
In this embodiment, the compression plate 34 is fastened to the end plate 12 with the two bolts 40. However, the present invention is not limited to this, and there is at least one bolt 40 for fastening the compression plate 34 and the end plate 12. Good.

  In this embodiment, the engaging means is formed by forming the engaging groove 43 as the engaging recess in the sensor stator 22 and the engaging claw 44 as the engaging protrusion in the elastic plate 34. An engagement claw may be formed on 22 and an engagement groove may be formed on the elastic plate 34. Further, the shapes of the engaging recess and the engaging protrusion are not limited to the groove shape and the claw shape.

  In this embodiment, by providing the end plate 12 with the long hole 39 through which the bolt 40 is inserted, the sensor stator 22 is locked to the end plate 12 while being relatively immovable relative to the elastic plate 34 in the circumferential direction. On the other hand, relative movement is possible in the circumferential direction in the temporarily assembled state. However, the present invention is not limited to this, and no locking means is provided between the elastic plate 34 and the sensor stator 22, and the elastic plate 34 can move relative to the end plate 12 and the sensor stator 22 in the circumferential direction in the temporarily assembled state. It is good also as a structure. In this case, the end plate 12 may be formed with a simple insertion hole or screw hole.

  In this embodiment, the hexagonal hole 42 as the fastening recess is formed in the tip 40a of the bolt 40. However, the shape of the fastening recess is not limited to the hexagonal hole but is a square hole or other shapes. May be.

  In the present embodiment, the present invention is embodied in a surface magnet type synchronous motor (SPM), but any other brushless motor having a built-in resolver as a rotation angle sensor such as a permanent magnet embedded synchronous motor (IPM). , It may be embodied in anything.

  In the present embodiment, the sensor connector 27 as the connector portion provided in the sensor stator 22 has a function as a position adjusting unit. However, the present invention is not limited to this, and the sensor stator 22 is connected to the sensor stator 22 via the wiring insertion hole 28. An operable protrusion or recess may be formed and used as position adjusting means. Further, such a position adjusting means may be provided on the side of the elastic plate 34 as long as the sensor stator 22 is locked to the elastic plate 34 so as not to move relative to the circumferential direction. With such a configuration, the circumferential position of the sensor stator 22 can be adjusted without applying excessive stress to the connection terminal embedded in the sensor connector 27.

  The position adjusting means includes not only the wiring insertion hole 28 through which the signal wiring 29 is inserted, but also other wiring insertion holes (for example, a power feeding unit) through which a power wiring for supplying driving power to the motor coil is inserted. 16 may be provided at a position where it can be operated via a power supply wiring insertion hole 45 (see FIG. 3).

  In the present embodiment, the sensor stator 22 is housed in the housing recess 32 of the end plate 12. However, the present invention is not limited to this, and a housing portion is provided on the inner side of the bottom portion 11b that is the axial end surface of the motor case body 11 formed in a bottomed cylindrical shape. A wire insertion hole for inserting a wire may be formed in the sensor, and the circumferential position of the sensor stator 22 may be changed via the wire insertion hole. The screw hole 41 to be screwed with the bolt 40 can be formed at a portion where the bottom portion is subjected to burring.

The top view of a brushless motor. Sectional drawing of the brushless motor along an AOB cross section. The bottom view of the end plate in which the sensor stator and the elastic plate are assembled. (A) Top view of sensor stator, (b) A-C sectional view of the sensor stator. (A) Top view of compression plate, (b) A-C sectional view of compression plate. The expanded sectional view of the brushless motor along an AOB cross section. FIG. 5 is a cross-sectional view of the end plate taken along the line AOC in the assembled state of the sensor stator and the elastic plate.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Brushless motor, 2 ... Motor coil, 4 ... Stator, 5 ... Rotating shaft, 6 ... Rotor, 7 ... Resolver, 10 ... Motor case, 11 ... Case main body, 11a ... Opening part, 12 ... End plate, 12a ... Inner surface , 13, 14 ... bearings, 21 ... sensor rotor, 22 ... sensor stator, 26 ... connection terminal, 27 ... sensor connector, 28 ... wiring insertion hole, 29 ... signal wiring, 30 ... grommet, 32 ... housing recess, 34 ... elastic pressure Plate, 39 ... long hole, 40 ... bolt, 40a ... tip, 41 ... screw hole, 42 ... hexagonal hole, 43 ... engagement groove, 44 ... engagement claw.

Claims (10)

A resolver comprising a sensor rotor that rotates integrally with a motor rotating shaft and an annular sensor stator that is fixed to the motor case and disposed outside the sensor rotor, the sensor stator having an end that closes the opening of the motor case body A brushless motor that is loosely fitted in a housing recess formed inside the plate and is clamped between a fixing member fastened to the end plate, and pressed and fixed to the end plate,
The end plate is formed with a wiring insertion hole for inserting a wiring, and the sensor stator has a position adjusting means operable through the wiring insertion hole to change a circumferential position of the sensor stator. A brushless motor characterized by being provided. The brushless motor according to claim 1,
The position adjusting means is a protrusion or a recess provided in the sensor stator;
Brushless motor characterized by The brushless motor according to claim 1,
The position adjusting means is a connector portion that protrudes radially outward from the outer circumference of the sensor stator and in which the connection terminal of the sensor stator is embedded,
Brushless motor characterized by In the brushless motor according to any one of claims 1 to 3,
The fixing member is fastened by a fastening screw that is screwed into a screw hole formed in the end plate, and a fastening recess that can be fastened through the screw hole is provided at a distal end portion of the fastening screw. A brushless motor characterized by being formed. In the brushless motor according to any one of claims 1 to 4,
The fixing member has a long hole extending in the circumferential direction and is fastened by a fastening screw inserted through the long hole, and the fixing member and the sensor stator are engaged with each other so as not to be relatively movable in the circumferential direction. A brushless motor comprising a locking means for stopping. The brushless motor according to claim 5,
The locking means is an engagement protrusion engaged with an engagement recess formed in the sensor stator or an engagement recess engaged with an engagement protrusion formed in the sensor stator;
Brushless motor characterized by In the brushless motor according to any one of claims 1 to 6,
The bearing that pivotally supports the rotating shaft is provided on the outer side in the axial direction than the housing recess;
Brushless motor characterized by A resolver comprising a sensor rotor that rotates integrally with a motor rotating shaft and an annular sensor stator that is fixed to the motor case and disposed outside the sensor rotor, the sensor stator having an end that closes the opening of the motor case body A brushless motor that is loosely fitted in a housing recess formed inside the plate and is clamped between a fixing member fastened to the end plate, and pressed and fixed to the end plate,
The fixing member has a long hole extending along the circumferential direction and is fastened by a fastening screw inserted through the long hole, and locked to the sensor stator so as not to be relatively movable in the circumferential direction. And
The end plate is formed with a wiring insertion hole for inserting a wiring, and the fixing member can be operated via the wiring insertion hole so as to change a circumferential position of the fixing member and the sensor stator. A brushless motor, characterized in that an adjusting means is provided. A resolver comprising a sensor rotor that rotates integrally with the motor rotation shaft and an annular sensor stator that is fixed to the motor case and disposed outside the sensor rotor; and the sensor stator is disposed inside the axial end surface of the motor case. A brushless motor that is press-fixed to the motor case by being loosely fitted in the formed housing recess and being sandwiched between a fixing member fastened to an axial end surface of the motor case,
The motor case is formed with a wiring insertion hole for inserting a wiring, and the sensor stator has position adjusting means operable through the wiring insertion hole to change a circumferential position of the sensor stator. A brushless motor characterized by being provided.   An electric power steering apparatus comprising the brushless motor according to any one of claims 1 to 9.

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