JP5293256B2 - Rotating electric machine and electric power steering apparatus using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dynamo-electric machine preventing coming off of a plurality of signal lines while maintaining assemblability. <P>SOLUTION: An output shaft 19 and a holder 33 holding a cylindrical rotational-angle detector detecting the angle of rotation of a rotor are arranged into a nearly cylindrical housing 15. One ends of a plurality of connecting lines 34a to 34f are connected electrically on the outer periphery of the holder 33 at regular intervals in the peripheral direction. The connecting lines are extended outward in the radial direction orthogonal to the axial direction of the output shaft, and inserted and held to a grommet 37 mounted between a flange 16 and the housing, and the other end side is led out to the outside of the housing. A plurality of the connecting lines are extended outward in the radial direction while being obliquely bent in the axial direction M by an engagement with signal-line guides 35 and 36. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a rotating electric machine in which a rotor, a stator, and a rotation angle detector are arranged in a housing, and an electric power steering apparatus using the rotating electric machine.

In general, an electric power steering apparatus is connected to a steering assist mechanism that transmits a steering assist force to an output shaft of a steering shaft. The steering assist mechanism is connected to a reduction gear connected to the output shaft and to the reduction gear. And an electric motor (rotary electric machine) that generates a steering assist force and a control device that drives and controls the electric motor.
An electric motor includes a cylindrical stator in which a coil is wound in a cylindrical motor case, a rotor having a magnetic pole and an output shaft facing the stator, and a rotation angle detector that detects the rotation angle of the rotor. The stator coil is connected to a plurality of power harnesses, and the angle detector is connected to the control device via a plurality of signal lines.

A signal wire with a smaller wire diameter than a power harness has a low tensile strength, and if the signal wire extends radially outward from the angle detector and is drawn out of the motor case, the angle detector A tensile force is applied directly to the electrical joint.
Therefore, the conventional electric motor is compressed by inserting a part of the signal wire extending radially outward from the angle detector in the motor case into the grommet, and compressing this grommet and attaching it to the motor case. The signal line was clamped by the grommet to prevent the signal line from coming off.

However, in a conventional apparatus, for example, during production, when a tensile force that is larger than the holding force by the grommet is applied to the signal line, the base end portion of the signal line extending radially outward from the angle detector ( Tensile stress concentrates on the electrical joint), and the base end may be damaged.
Therefore, a structure is known in which a plurality of signal wires are bundled to form a multi-core wire, and the multi-core wire is drawn in the circumferential direction in the motor case and then pulled out to the outside of the motor case to prevent the signal wire from coming off. (For example, Patent Document 1 and Patent Document 2).

JP 2006-211182 A JP 2004-323019 A

However, the signal line disconnection prevention structure of Patent Documents 1 and 2 has a problem in terms of assembly of the electric motor because the signal line must be routed in the circumferential direction in the motor case.
In addition, the multiple signal lines routed in the circumferential direction in the motor case must be connected to the control device unless the inner and outer signal lines are set to different lengths. There is a risk that excessive or insufficient line lengths or excessive slack (sag) may occur, and the tolerance management of the lengths of a plurality of signal lines is difficult.

  Therefore, the present invention has been made paying attention to the unsolved problems of the above-described conventional example, and uses a rotating electrical machine capable of enhancing the resistance against the disconnection of a plurality of signal lines while maintaining the assemblability. An object of the present invention is to provide an electric power steering apparatus.

In order to achieve the above object, a rotating electric machine according to the present invention includes an output shaft, a rotor fixed to the output shaft, and a rotor in a substantially cylindrical housing having one end opened and the other end closed. A stator facing the outer periphery of the rotor, a cylindrical rotation angle detector for detecting the rotation angle of the rotor, and one end of the rotation angle detector in the circumferential direction of the outer circumferential surface of the stator is electrically connected at a predetermined interval, A plurality of connecting wires extending radially outward perpendicular to the axial direction of the output shaft, and the plurality of connecting wires include a flange closing the opening of the housing and an opening edge of the flange In a rotating electrical machine that is inserted and sandwiched in a grommet that is mounted while being compressed between, and the other end is drawn out of the housing, the plurality of connection lines are empty spaces surrounded by the housing and the flange. It extends in the radial outward while bent so as to be inclined in the axial direction of the output shaft by engaging the signal line guide portion disposed in the signal line guide portion, one end of the plurality of connection lines On the side, a slack portion bulging in the axial direction is formed, and at a position close to the outer peripheral surface of the rotation angle detector, a flat plate-like shape that faces the outer peripheral surface and extends in one of the axial directions A first signal line guide is provided, and the free end surface of the first signal line guide is formed as an arc guide surface that protrudes most at the center in the plate width direction and gradually decreases toward both ends in the plate width direction. A plurality of signal lines extending from the outer peripheral surface of the rotation angle detector at a predetermined interval in the circumferential direction, and a signal line at a central portion in the circumferential direction is connected to a central portion of the arc guide surface. The signal lines at both ends in the circumferential direction are connected to both ends of the arc guide surface. By coupling, substantially match the loosening amount of the slack portion of the plurality of signal lines.

According to the present invention, even if an excessive tensile force is applied to a plurality of signal lines than the clamping force of the grommet, the signal line engaged with the signal line guide portion has a frictional force that resists the excessive tensile force. Therefore, the tensile stress is not concentrated on one end of the signal line electrically connected to the rotation angle detector, and the resistance against the signal line can be increased.
In addition, since the signal line of the present invention only extends outward in the radial direction while engaging with the signal line guide portion, it rotates as compared with the conventional device in which the signal line extends in the circumferential direction. Easy assembly of electric machine.

Further, according to the present invention, when the rotation angle detector is rotated and arranged in the housing, a tensile force does not act on the plurality of signal lines provided with the slack portions. Can be taken widely.

In addition, according to the present invention, the amount of looseness of the slack portions of the plurality of signal lines engaged with the first signal line guide substantially coincides, so that the rotation adjustment range of the rotation angle detector can be widened.
Further, in the rotating electrical machine according to the present invention, the signal line guide portion is located radially outward with respect to the first signal line guide, is parallel to the first signal line guide, and the shaft A second signal line guide extending in the other direction, the second signal line guide and the first signal line guide extend so that their free end faces overlap, and the plurality of signal lines are It is preferable to extend outward in the radial direction while being bent so as to be inclined in the axial direction by engaging with the free end surfaces of the first signal line guide and the second signal line guide.

According to this invention, by providing the first signal line guide and the second signal line guide, the plurality of signal lines extend radially outward while being bent so as to be inclined in the axial direction, thereby forming a slack portion. Therefore, it is not necessary to manage the tolerance of the signal line length.
In the rotating electrical machine according to the present invention, it is preferable that the signal line guide portion is provided integrally with a holder that holds the rotation angle detector in the housing.

In the rotating electrical machine according to the present invention, the signal line guide portion has a bus bar arranged so as to cover the stator and the rotor on the opening side in the housing, and a facing surface of the flange facing the bus bar. Are preferably provided integrally with each other.
Furthermore, the electric power steering apparatus according to the present invention preferably uses the above-described rotating electrical machine as a motor that generates a steering assist force in the steering mechanism.

  According to the present invention, the assembling property of the rotating electrical machine can be improved, so that the manufacturing cost of the electric power steering device can be reduced.

  According to the rotating electrical machine of the present invention, the signal line guide portion is engaged even if a tensile force larger than the grommet clamping force is applied to the plurality of signal lines, rather than the signal lines being routed in the circumferential direction. Since a frictional force against the excessive tensile force is generated in the signal line, the tensile stress is not concentrated on one end of the signal line that is electrically connected to the rotation angle detector. Can be increased. In addition, since the signal line of the present invention only extends outward in the radial direction while engaging with the signal line guide portion, it rotates as compared with the conventional device in which the signal line extends in the circumferential direction. The assembly of the electric machine is improved.

  In addition, according to the electric power steering apparatus according to the present invention, it is possible to improve the assembling property of the rotating electric machine, rather than routing the signal line in the circumferential direction, thereby reducing the manufacturing cost of the electric power steering apparatus. be able to.

It is a schematic block diagram which shows the electric power steering apparatus which uses the rotary electric machine which concerns on this invention. It is a figure which shows the rotary electric machine of 1st Embodiment which concerns on this invention. It is an AA arrow directional view of FIG. It is a figure which shows the structure which prevents the omission of the signal wire pulled out from the rotation angle detector of 1st Embodiment which concerns on this invention. It is a BB line arrow directional view of FIG. It is a figure which shows the structure which prevents the omission of the signal wire pulled out from the rotation angle detector of 2nd Embodiment which concerns on this invention. It is a figure which shows the principal part of the structure which prevents the omission of a signal wire | line in 2nd Embodiment. It is CC line arrow line view of FIG.

DESCRIPTION OF EMBODIMENTS Hereinafter, modes for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the drawings.
FIG. 1 is an overall configuration diagram showing an embodiment in which the present invention is applied to an electric power steering apparatus. In the figure, reference numeral 1 denotes an electric power steering apparatus. The electric power steering apparatus 1 is a driver. Is provided with a steering mechanism 2 for steering.
The steering mechanism 2 includes a steering shaft 4 having an input shaft 4a and an output shaft 4b through which a steering force applied from a driver is transmitted to the steering wheel 3, and the steering shaft 4 is one end of the input shaft 4a. Is connected to the steering wheel 3, and the other end is connected to one end of the output shaft 4b via a torque sensor 5 as steering torque detecting means.

  The steering force transmitted to the output shaft 4 b is transmitted to the lower shaft 7 via the universal joint 6 and further transmitted to the pinion shaft 9 via the universal joint 8. The steering force transmitted to the pinion shaft 9 is transmitted to the tie rod 11 via the steering gear 10 to steer a steered wheel (not shown). Here, the steering gear 10 is configured in a rack and pinion type having a pinion 10a connected to the pinion shaft 9 and a rack 10b meshing with the pinion 10a, and the rotational motion transmitted to the pinion 10a is linearly moved by the rack 10b. It has been converted to movement.

A steering assist mechanism 12 that transmits a steering assist force to the output shaft 4b is connected to the output shaft 4b of the steering shaft 4. The steering assist mechanism 12 includes a reduction gear 13 connected to the output shaft 4 b and a brushless motor 14 that generates a steering assist force connected to the reduction gear 13.
The brushless motor 14 is driven and controlled by the control device 42.

  That is, the steering torque applied to the steering wheel 3 and transmitted to the input shaft 4a is input to the control device 42 from the torque sensor 5, the vehicle speed detection value is input from the vehicle speed sensor 41, and the control device 42 detects the vehicle speed. The steering assist command value is calculated with reference to a control map storing the relationship between the steering torque and the steering assist command value using the value as a parameter, and based on the calculated steering assist command value and the motor current flowing through the brushless motor 14. Feedback control is performed to calculate a motor current command value, and the calculated motor current command value is supplied to a motor drive circuit 43 constituted by an inverter circuit. Based on the angle detection signal from the resolver 20 that detects the rotor rotation angle of the motor 14, a motor drive current is formed. Supplying over motor drive current to the brushless motor 14. Thereby, the brushless motor 14 generates a steering assist force corresponding to the steering assist command value input from the control device 42.

(Brushless motor of the first embodiment)
Next, FIGS. 2 to 5 show the brushless motor of the first embodiment. 2 is a cross-sectional view taken along the motor shaft of the brushless motor, FIG. 3 is a view taken along the line AA in FIG. 2, and FIG. 4 shows a structure for preventing the signal line drawn from the resolver holder 33 holding the resolver from coming off. FIG. 5 and FIG. 5 are BB line arrow views of FIG.

  As shown in FIGS. 2 and 3, the brushless motor 14 of this embodiment includes a motor case 15 formed in a substantially cylindrical shape with one end opened and the other end closed, and a motor on the opening side of the motor case 15. A flange 16 that closes and connects the opening of the case 15, a substantially annular stator 17 attached to the inner wall of the motor case 15, a rotor 18 disposed on the inner peripheral side of the stator 17, and rotation of the rotor 18 A resolver 20 that detects an angle, and a substantially disc-shaped bus bar 22 that is engaged with the inner wall of the motor case 15 and that faces the opening side of the motor case 15 of the stator 17 are provided.

At the other end of the motor case 15, a fitting portion 15b for fitting the rear bearing 21b is formed. The rear bearing 21b rotatably supports one end side of the shaft 19 of the rotor 18 in the motor axis M direction.
The flange 16 is provided with a bearing fitting hole 23 into which the front bearing 21a is fitted on the inner diameter side, and the front bearing 21a rotatably supports the other end side of the shaft 19 in the motor axis M direction.

The stator 17 has a stator core 27 in which metal core plates are laminated, and a three-phase coil 29 is wound on the inner peripheral side of the stator core 27 via an insulator 28.
The rotor 18 has a shaft 19 rotatably supported at both ends by a front bearing 21a and a rear bearing 21b, a rotor core 31a press-fitted into the outer periphery of the shaft 19, or integrally formed with the shaft 19, and an outer periphery of the rotor core 31a. A magnet 31b fixed by bonding or the like, an annular rotor cover 32 that is attached to the outer peripheral surface of the magnet 31b and covers the magnet 31b, and a resolver rotor 20r that constitutes the resolver 20 fixed to one end side outer periphery of the shaft 19 I have. The magnet 31b has a plurality of magnetic poles arranged in the circumferential direction of the shaft 19, and the resolver rotor 20r is composed of an annular laminated electromagnetic steel sheet in which the plurality of magnetic poles extend in the circumferential direction.

The terminal ends of the coils 29 of each phase of the stator 17 are electrically connected to a terminal block (not shown) provided on the bus bar 22. A power harness (not shown) electrically connected to the motor drive circuit 43 and drawn into the motor case 15 is electrically connected to the terminal block of the bus bar 22.
The resolver 20 includes the resolver rotor 20r described above, an annular resolver stator 20s surrounding the outer periphery of the resolver rotor 20r, and a resolver provided on the inner peripheral surface of the resolver stator 20s at predetermined intervals in the circumferential direction. A stator coil 20c and a resolver holder 33 that engages with the outer periphery of the resolver stator 20s to cover the outer periphery of the resolver stator 20s and is detachably fixed to a surface of the bus bar 22 facing the opening side of the motor case 15 are provided. Yes.

  As shown in FIG. 3, the resolver holder 33 includes a cylindrical holder main body 33a and a pair of mounting flanges 33b extending radially outward from the opening end of the holder main body 33a in axial symmetry. The mounting flange 33b is formed with an arc-shaped screw insertion hole 33c with the axis of the holder body 33a as the center of the arc. The resolver holder 33 is fixed by abutting the pair of mounting flanges 33b against the bus bar 22 and screwing the fixing screws 47 inserted through the screw insertion holes 33c into the surface.

  One end (hereinafter referred to as a base end portion) of a plurality of signal lines 34a to 34f is electrically connected to the outer peripheral surface of the resolver stator 20s of the resolver 20 with a predetermined distance in the circumferential direction. These signal lines 34 a to 34 f pass through the holder body 33 a of the resolver holder 33 outward in the radial direction orthogonal to the motor axis M, and are drawn out of the motor case 15, and the other ends are electrically connected to the motor drive circuit 43. It is connected.

  As shown in FIGS. 3 and 4, the signal wires 34 a to 34 f protrude in the motor shaft M direction from the inner wall of the flange 16 toward the bus bar 22 in the motor case 15 in which the signal wires 34 a to 34 f extend radially outward. The first signal line guide 35 in the form of a flat plate, the tip of which is engaged with the signal line, and the surface of the bus bar 22 facing the inner wall of the flange 16 project toward the flange 16 toward the motor axis M. And a flat second signal line guide 36 having a tip portion engaged with the signal line, and a grommet 37 made of an elastic member disposed between the flange 16 and the motor case 15. .

The first signal line guide 35 is located on the resolver holder 22 (resolver 20) side radially inward from the second signal line guide 36, and the motor shaft M of the first signal line guide 35 and the second signal line guide 36. The projecting dimension in the direction is set so that the tip portions of the directions overlap in the direction of the motor shaft M.
The protruding dimension of the first signal line guide 35 in the motor axis M direction is set to a dimension that protrudes toward the bus bar 22 beyond the position of the base end portion of the signal lines 34 a to 34 f drawn from the resolver holder 33.

As shown in FIG. 5, the front end portion of the first signal line guide 35 with which the signal lines 34 a to 34 f are engaged protrudes most at the center portion in the plate width direction, and gradually increases from the center portion toward both end portions in the plate width direction. It is formed as a circular arc front end surface 35a in which the protruding amount decreases.
The grommet 37 is a member that is formed with a through-hole 37a through which each signal line 34a to 34f passes, and is mounted while being elastically compressed in a grommet mounting hole 38 formed between the flange 16 and the motor case 15.

The signal lines 34a to 34f drawn out from the holder main body 33a of the resolver holder 33 in the radial direction are engaged with the arc tip surface 35a of the first signal line guide 35 and the tip of the second signal line guide 36, and the grommet. After passing through the through hole 37 a of 37, it is drawn out of the motor case 15.
By the way, the base end sides of the signal lines 34a to 34f are engaged with the first signal line guide 35 and the second signal line guide 36 whose front ends overlap with each other in the motor axis M direction, so that the diameter is the same as that of the conventional device. Instead of linearly extending outward in the direction, the bent portions 39a and 39b are provided so as to incline in the direction of the motor shaft M and extend outward in the radial direction (see FIG. 4).

  Moreover, since the arc front end surface 35a of the first signal line guide 35 protrudes toward the bus bar 22 beyond the position of the base end of the signal lines 34a to 34f, each signal line 34a to 34f is connected to the base end. A slack portion 40 is formed in the direction of the motor shaft M between the second signal line guide 36 (see FIG. 4).

  Here, as shown in FIG. 3, the base ends of the signal wires 34a to 34f that are electrically connected at a predetermined interval in the circumferential direction of the holder main body 33a of the resolver holder 33 (the outer peripheral surface of the resolver stator 20s). The radial line length from the first signal line guide 35 to the first signal line guide 35 is short in the radial direction of the signal lines 34c and 34d located at the center in the circumferential direction, and the signal lines 34a and 34f located at both ends in the circumferential direction. The radial line length is long. On the other hand, the arc tip surface 35a of the first signal line guide 35 is formed so that the amount of protrusion gradually decreases from the center toward both ends in the plate width direction. The signal lines 34c and 34d located at the center of the direction have a long line length along the motor axis M, and the signal lines 34a and 34f located at both ends in the circumferential direction have a short line length along the motor axis M. .

As described above, each of the signal lines 34a to 34f has a long line length in the direction along the motor axis M when the radial line length is short, and a direction along the motor axis M when the radial line length is long. Therefore, the signal line length of the slack portion 40 formed on each of the signal lines 34a to 34f is set to be substantially constant.
Next, the operation of the electric power steering apparatus 1 according to this embodiment will be described.

  Assuming that the vehicle is now stopped, in this state, when the steering wheel 3 is turned to the right (or left), the steering torque applied to the steering wheel 3 is a torque sensor. 5, and the detected steering torque is input to the control device 42, and a zero vehicle speed detection value detected by the vehicle speed sensor 41 is input to the control device 42.

  The control device 42 refers to the control map based on the steering torque and the vehicle speed detection value, calculates a relatively large steering assist command value, and performs feedback control based on the deviation between the steering assist command value and the motor current detection value. The motor current command value is calculated by performing this operation, and the motor current command value is output to the motor drive circuit 43, whereby the motor drive current based on the angle detection signal detected by the resolver 20 is obtained by the motor drive circuit 43. Electric power is supplied to the multiple-phase coils 29 of the stator 17 of the brushless motor 14 through the power harness drawn from the motor drive circuit 43.

  When a motor drive current is supplied to the multiple-phase coils 29 of the stator 17, the rotor 18 is rotationally driven by the generation of the rotating magnetic field of the stator 17 to generate a steering assist force. This steering assist force is transmitted via the shaft 19. When transmitted to the reduction gear 13, the reduction gear 13 can apply a large steering assist torque to the output shaft 4 b of the steering shaft 4 in the same direction as the rotation direction of the steering wheel 3, so that the steering wheel 3 can be lightly steered. it can.

  When the vehicle is driven from this state, the calculated steering assist command value becomes a small value even if the steering torque is the same as the vehicle speed detection value increases, and the brushless motor 14 is driven to rotate accordingly. The steering assist force generated by the brushless motor 14 is smaller than that at the time of stationary, and the optimum steering assist force corresponding to the vehicle speed is generated.

Next, the effects of the brushless motor 14 of the first embodiment and the electric power steering apparatus 1 including the brushless motor 14 will be described.
The signal lines 34a to 34f projecting from the peripheral surface of the resolver 20 according to the present embodiment have bent bases 39a and 39b at their base end sides to form the first signal line guide 35 and the second signal line guide. 36 is engaged with the tip of 36, and is pulled out of the motor case 15 in a state of being sandwiched by a grommet 37 that is elastically compressed and disposed in a grommet mounting hole 38 between the flange 16 and the motor case 15. .

  As a result, even if a tensile force larger than the clamping force of the grommet 37 is applied to the signal lines 34 a to 34 f, the signal line 34 a that engages with the distal ends of the first signal line guide 35 and the second signal line guide 36. Since a frictional force against an excessive tensile force is generated in the bent portions 39a and 39b of .about.34f, the tensile stress is concentrated on the base end portions (electrical connection portions with the resolver stator 20s) of the signal lines 34a to 34f. Without being able to increase the resistance against the loss of the signal lines 34a to 34f.

  Further, the signal lines 34 a to 34 f of the present embodiment are not arranged so as to be routed in the circumferential direction in the motor case 15 as in the conventional device, and the leading ends of the first signal line guide 35 and the second signal line guide 36. The brushless motor 14 can be assembled more easily than the conventional apparatus that circulates the signal line in the circumferential direction because it extends only outward in the radial direction orthogonal to the motor shaft M while engaging the portion.

  Further, when the resolver 20 is mounted on the bus bar 22, the engagement position of the screw insertion hole 33 c formed in the mounting flange 33 b of the resolver holder 33 that holds the resolver 20 and the fixing screw 47 is changed and fixed while rotating. . When the resolver 20 is rotationally adjusted in this manner, in this embodiment, the slack portion 40 is provided on the base end side of the signal lines 34a to 34f drawn from the resolver 20, and therefore the rotational adjustment of the resolver 20 is performed. Can be wide.

  Further, the signal lines 34a to 34f extending from the outer periphery of the resolver at a predetermined interval in the circumferential direction are signal lines having a short radial line length (a length in a direction perpendicular to the motor axis M). The signal length of the signal line 34a to 34f is set to be short by setting the line length in the direction along the axis to be long and setting the signal line having a long radial direction length to be short in the direction along the motor axis M. Is set to be substantially constant, and when adjusting the rotation of the resolver 20, there is no signal line on which the amount of slack and tensile force acts, so that the rotation adjustment range of the resolver 20 can be further widened.

  In addition, the motor case 15 includes a first signal line guide 35 projecting from the inner wall of the flange 16 toward the bus bar 22 and a second signal line guide 36 projecting from the bus bar 22 toward the flange 16. , The bent portions 39a and 39b bent at the designed angle and the slack portion 40 having the optimum length can be formed on the signal lines 34a to 34f, so that the length of the signal lines 34a to 34f can be increased. Tolerance management can be eliminated, and breakage due to vibration can be prevented.

  Furthermore, since the electric power steering apparatus 1 including the brushless motor 14 according to the present embodiment can improve the assemblability of the brushless motor 14 as compared with the conventional apparatus that routes the signal line in the circumferential direction, The manufacturing cost of the steering device 1 can also be reduced.

(Brushless motor of the second embodiment)
Next, FIGS. 6 to 8 show the main part of the brushless motor of the second embodiment. FIG. 6 is a diagram showing a structure for preventing the signal line from coming off from the motor axial direction, and FIG. FIG. 8 is a cross-sectional view showing the main part of the structure for preventing line disconnection from the direction orthogonal to the motor shaft, and FIG. 8 is a view taken along the line CC in FIG.

In addition, the same code | symbol is attached | subjected to the same component as the structure shown in FIGS. 1-5, and the description is abbreviate | omitted.
In the present embodiment, the resolver holder 33 is provided with a flat plate-like first signal line guide 24 and a second signal line guide 25 integrally.
That is, a pair of guide support rods 45a and 45b that are spaced in parallel from each other in a radially outward direction (a direction orthogonal to the motor shaft M) from a portion close to the flange 16 of the holder body 33a are fixed. A flat plate-like first signal line guide 24 protruding in the direction of the motor shaft M is fixed between the front ends of the support rods 45a and 45b.

Further, a guide support plate 46 is provided radially outward from a portion of the holder main body 33a close to the bus bar 22, and a flat second signal line guide that protrudes in the direction of the motor shaft M is provided on the guide support plate 46. 25 is fixed.
In the present embodiment, the first signal line guide 24 is positioned on the resolver holder 22 (resolver 20) side radially inward from the second signal line guide 25, and the first signal line guide 24 and the second signal line guide are provided. The 25 projecting dimensions in the direction of the motor shaft M are set so that the tip portions thereof overlap in the direction of the motor shaft M.

The protruding dimension of the first signal line guide 35 in the motor axis M direction is set to a dimension that protrudes toward the bus bar 22 beyond the position of the base end portion of the signal lines 34 a to 34 f drawn from the resolver holder 33.
The distal end portion of the second signal line guide 25 is formed as an arc distal end surface 25a in which the central portion in the plate width direction protrudes most and the protruding amount gradually decreases from the central portion toward both ends in the plate width direction. Yes.

Further, the base end sides of the signal lines 34a to 34f are engaged with the first signal line guide 24 and the second signal line guide 25 whose front end portions overlap in the motor axis M direction, so that the bent portions 26a and 26b are engaged. It is formed and extends radially outward while being inclined in the direction of the motor axis M (see FIG. 7).
Further, a slack portion 48 is formed in the direction of the motor shaft M in the signal lines 34a to 34f between the second signal line guide 25 and the grommet 37 (see FIG. 7).

Next, the effect of the brushless motor 14 of this embodiment and the electric power steering apparatus 1 provided with the brushless motor 14 will be described.
Even in the present embodiment, even if a tensile force that is larger than the clamping force of the grommet 37 is applied to the signal lines 34 a to 34 f, the signals that engage with the distal ends of the first signal line guide 24 and the second signal line guide 25. A frictional force against an excessive tensile force is generated in the bent portions 26a and 26b of the wires 34a to 34f, so that the tensile stress is not concentrated on the base ends of the signal wires 34a to 34f, and the signal wires 34a to 34f It is possible to increase resistance to disconnection.

In addition, the signal lines 34a to 34f of the present embodiment extend outward in the radial direction perpendicular to the motor shaft M while engaging the tip portions of the first signal line guide 24 and the second signal line guide 25. Therefore, the assembling property of the brushless motor 14 can be improved as compared with the conventional device that routes the signal line in the circumferential direction.
Further, when the resolver 20 is rotationally adjusted, the first signal line guide 24 and the second signal line guide 25 are also rotated in the same direction simultaneously with the rotation of the resolver holder 33, and the base end portions (resolver of the signal lines 34a to 34f). Since a tensile force does not act on the electrical connection portion with the stator 20s), it is possible to increase the resistance against the disconnection of the signal lines 34a to 34f.

  Each of the signal lines 34a to 34f is provided with a circular arc front end surface 25a in which the central portion in the plate width direction protrudes most and the protruding amount gradually decreases from the central portion toward both ends in the plate width direction. A slack portion 48 is formed between the signal line guide 25 and the grommet 37, and the length of the slack portion 48 of each of the signal lines 34a to 34f is set to be substantially constant. Therefore, the resolver holder 33 is used when adjusting the resolver. The resolver adjustment range when rotating the can be widened, and breakage due to vibration can be prevented.

In the above embodiment, the case where the resolver 20 is applied as a rotation angle detector for detecting the rotation angle of the rotor has been described. However, the present invention is not limited to this, and a magnetic detection element such as a Hall element or a rotary encoder Any rotation angle detector such as can be applied.
In the above embodiment, the structure in which the first signal line guides 35 and 24 and the second signal line guides 36 and 25 are arranged between the resolver 22 and the grommet 37 is shown. However, the present invention is not limited to this, and a structure in which three or more signal line guides are provided may be used as long as the signal lines have three or more bends.

  Moreover, in each embodiment, although the case where the brushless motor 14 was applied to the electric power steering apparatus was demonstrated, it is not limited to this, Rotation drive of arbitrary apparatuses, such as an electric brake device and other vehicle equipment, Can be applied as a source.

  DESCRIPTION OF SYMBOLS 1 ... Electric power steering device, 2 ... Steering mechanism, 3 ... Steering wheel, 4 ... Steering shaft, 4a ... Input shaft, 4b ... Output shaft, 5 ... Torque sensor, 6 ... Universal joint, 7 ... Lower shaft, 8 ... Universal Joint, 9 ... Pinion shaft, 10 ... Steering gear, 10a ... Pinion, 10b ... Rack, 11 ... Tie rod, 12 ... Steering assist mechanism, 13 ... Reduction gear, 14 ... Brushless motor (motor), 15 ... Motor case (housing) , 15b ... fitting portion, 16 ... flange, 17 ... stator, 18 ... rotor, 19 ... shaft (output shaft), 20 ... resolver (rotation angle detector), 20s ... resolver stator, 20c ... resolver stator coil, 20r ... Resolver rotor, 20s ... Resolver stator, 21a ... Lont bearing, 21b ... rear bearing, 22 ... bus bar, 23 ... bearing fitting hole, 24 ... first signal line guide, 25 ... second signal line guide, 26a, 26b ... bent portion, 27 ... stator core, 28 ... insulator, DESCRIPTION OF SYMBOLS 29 ... Coil, 31a ... Rotor core, 31b ... Magnet, 32 ... Rotor cover, 33 ... Resolver holder (holder), 33a ... Holder body, 33b ... Flange, 33c ... Screw insertion hole, 34a-34f ... Signal wire, 35 ... First 1 signal line guide (signal line guide), 35a ... arc tip surface (arc guide surface), 36 ... second signal line guide (signal line guide), 37 ... grommet, 37a ... through hole, 38 ... grommet mounting hole, 39a , 39b ... bent portion, 40 ... slack portion, 41 ... vehicle speed sensor, 42 ... control device, 43 ... motor drive circuit, 45a, 4 b ... guide supporting rod, 46 ... guide supporting plate, 47 ... fixing screw, 48 ... slack portion, (the axial direction of the output shaft) M ... motor shaft

Claims (5)

An output shaft, a rotor fixed to the output shaft, a stator facing the outer periphery of the rotor, and a rotation angle of the rotor are detected in a substantially cylindrical housing having one end opened and the other end closed. A cylindrical rotation angle detector and one end of the rotation angle detector in the circumferential direction of the outer circumferential surface of the rotation angle detector are electrically connected at a predetermined interval, and extend radially outward perpendicular to the axial direction of the output shaft. A plurality of connecting wires, and the plurality of connecting wires are inserted and sandwiched between a flange that closes the opening of the housing and an opening edge of the flange while being compressed. In the rotating electrical machine in which the other end is drawn out of the housing,
The plurality of connecting wires extend outward in the radial direction while being bent so as to be inclined in the axial direction of the output shaft by engaging with a signal line guide portion disposed in a space surrounded by the housing and the flange. standing by,
The signal line guide portion forms a slack portion that bulges in the axial direction on one end side of the plurality of connection lines, and faces the outer peripheral surface at a position close to the outer peripheral surface of the rotation angle detector. And a flat first signal line guide extending in one of the axial directions,
The free end surface of the first signal line guide is formed as an arc guide surface in which the central portion in the plate width direction protrudes most and the protrusion amount gradually decreases toward both ends in the plate width direction,
A plurality of signal lines extending at a predetermined interval in the circumferential direction from the outer peripheral surface of the rotation angle detector are engaged with a signal line at a central portion in the circumferential direction and a central portion of the arc guide surface. The rotating electrical machine is characterized in that the signal lines at both ends in the circumferential direction are engaged with both ends of the arc guide surface so that the slackness of the slack portions of the plurality of signal lines is substantially equal . The signal line guide portion is located radially outward with respect to the first signal line guide, is parallel to the first signal line guide, and extends to the other in the axial direction. With line guides,
The second signal line guide and the first signal line guide extend so that their free end faces overlap each other, and the plurality of signal lines are free end faces of the first signal line guide and the second signal line guide. The rotating electrical machine according to claim 1, wherein the electric rotating machine extends outward in the radial direction while being bent so as to be inclined in the axial direction by engaging with the rotating electric machine. 3. The rotating electrical machine according to claim 1, wherein the signal line guide portion is provided integrally with a holder that holds the rotation angle detector in the housing . The signal line guide part is provided integrally with a bus bar arranged so as to cover the stator and the rotor on the opening side in the housing, and a facing surface of the flange facing the bus bar. The rotating electrical machine according to any one of claims 1 to 3, wherein the rotating electrical machine is characterized in that: An electric power steering apparatus using the rotating electrical machine according to any one of claims 1 to 4 as a motor that generates a steering assist force in a steering mechanism.

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