JP5299706B2 - Rotating electric machine and electric power steering device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotating electric machine in which a signal line of a resolver sensor can be shortened. <P>SOLUTION: The rotating electric machine 12 has a bottomed cylindrical case 50 for housing a rotor 61 and a stator 62, a lid portion 51 for closing an opening portion of the case 50 and allowing an output shaft of the rotor 61 to penetrate, a flange member 52 having a case inserting hole 52a capable of inserting the case 50 and an external attaching portion 52b attachable to the outer circumference of the case 50 and available to attach the rotating electric machine 12 to an attaching object, a control unit 14 attached to the flange member 52 and controlling the drive of the rotating electric machine 12, and a resolver sensor 101 provided on the front end side of the lid portion 51 and detecting the rotation position of the output shaft of the rotor 61. On the front surface of the control unit 14, a sensor connector 111 to which a sensor harness 104 of the resolver sensor 101 is connected is provided. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a rotating electrical machine and an electric power steering device.

2. Description of the Related Art Conventionally, a rotating electrical machine has been used as a drive source for an electric power steering device (EPS) used in, for example, an automobile steering system.

A conventional rotating electrical machine has a bottomed cylindrical case that accommodates a rotor and a stator, and a bracket portion that is disposed in an opening of the case and through which an output shaft of the rotor passes. With this bracket portion, the rotating electric machine is attached to a reduction gear or the like of a peripheral device via a screw. A control unit that controls driving of the rotating electrical machine is attached to the outer periphery of the case.

For example, a resolver sensor that performs alignment in the rotational direction of the rotor is provided inside the bracket portion. Further, a harness for supplying power to the stator and a harness for the resolver sensor are connected to each terminal of the control unit (see Patent Documents 1 to 5).

Japanese Patent No. 3593102 JP 2004-23841 A JP 2008-109837 A JP 2007-237790 A International Publication No. 2007/026894

However, in the above-described rotating electrical machine, the sensor harness of the resolver sensor is connected to a sensor terminal provided on the side surface of the control unit. For this reason, the sensor harness of the resolver sensor is much longer than the linear distance between the resolver sensor and the control unit. The longer the harness of the resolver sensor, the easier it is for noise to enter, and a shorter one is desirable to ensure the accuracy of the resolver sensor.

This invention is made | formed in view of this point, and it aims at providing the rotary electric machine which can shorten the signal wire | line of a resolver sensor, and the electric power steering apparatus which has the rotary electric machine.

  To achieve the above object, the present invention provides a bottomed cylindrical case that accommodates a rotor and a stator, a lid that closes an opening of the case and passes an output shaft of the rotor, and outputs the case to the output. A flange member that has a case insertion hole that can be inserted in the axial direction, can be attached to the outer periphery of the case, and has an external attachment portion for attaching the rotating electrical machine to the attachment object; and provided in the flange member, A control unit that controls the driving of the rotating electrical machine, and a resolver sensor that is provided on the front side or the rear side of the lid in the output shaft direction and detects the rotational position of the output shaft of the rotor, The rotating electric machine is provided with a sensor terminal to which a signal line of the resolver sensor is connected on the front surface of the unit in the output shaft direction.

  According to the present invention, since the signal line of the resolver sensor can be connected to the sensor terminal on the front surface of the control unit, the signal line of the resolver sensor can be shortened compared to the conventional case. As a result, noise is suppressed from entering the signal line of the resolver sensor, and the accuracy of the resolver sensor can be improved. Therefore, the rotation accuracy of the rotating electrical machine can be improved.

  The sensor terminal may be provided adjacent to the case insertion hole. In such a case, the sensor terminal becomes closer to the resolver sensor, and the signal line can be made shorter.

  A power supply terminal to which a power supply line for supplying power to the stator is connected may be provided on the front surface of the control unit in the output shaft direction. In such a case, since the power supply terminal of the power supply line and the sensor terminal of the signal line of the resolver sensor are provided on the front surface of the same control unit, it is possible to easily and quickly connect the power supply line and the signal line to each terminal. it can.

  The lid portion, the flange member, and the case can be attached to each other by a screw inserted from the front side in the output axis direction, and the feeder line is attached by a screw inserted from the front side in the output axis direction. It may be attachable to the power supply terminal. In such a case, the attachment of the lid, the flange member, and the case and the attachment of the power supply line to the power supply terminal can be realized by turning the screw from the same direction, so that the rotating electrical machine can be assembled easily and quickly.

  The power supply line may have an elastic force and be pressed against and connected to the power supply terminal by the elastic force. In such a case, since the power supply line can be connected to the power supply terminal without using a screw, it is possible to reduce the work at the time of assembling the rotating electrical machine and speed up the assembly. Further, since the number of parts is reduced, the cost can be reduced.

  An attachment portion for attaching the flange member may be formed on an outer peripheral portion of the case, and the flange member may be attached to the attachment portion by inserting the case from the bottom side of the case. In this case, since the case can be inserted from the bottom side with less wiring and the flange member can be attached to the case, the flange member can be easily attached.

  The present invention according to another aspect is an electric power steering apparatus having the rotating electric machine described above. According to the present invention, since the signal line of the resolver sensor can be shortened to increase the accuracy of the resolver sensor, an electric power steering apparatus with high rotation accuracy of the rotating electrical machine can be realized.

According to the present invention, since the signal line of the resolver sensor can be shortened to improve the accuracy of the resolver sensor, the rotation accuracy of the rotating electrical machine can be increased.

It is explanatory drawing which shows the outline of a structure of an electric power steering apparatus. It is explanatory drawing which shows the outline of a structure of a worm reduction mechanism. It is the front view which looked at the rotary electric machine from the front side. It is sectional drawing of the rotary electric machine which shows the connection part of an electric power feeding terminal and a bus bar. It is sectional drawing of the rotary electric machine which shows a mutual attachment part of a case, a flange member, and a cover part. It is sectional drawing of the rotary electric machine which shows the attaching part of a flange member. (A) is explanatory drawing which shows the state before fitting a flange member in a case, (B) is explanatory drawing which shows the state which fitted the flange member in the case. It is the front view which looked at the rotary electric machine which shows the position of the electric power feeding terminal in the case of using the bus bar which has elasticity from the front side. It is sectional drawing of the rotary electric machine which shows the connection part of the bus bar which has elasticity, and an electric power feeding terminal. It is the front view which looked at the rotary electric machine from which a sensor harness passes the outer side of a cover part from the front side.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram showing an outline of the configuration of an electric power steering apparatus 1 having a rotating electrical machine according to the present embodiment. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  The electric power steering apparatus 1 is, for example, of a column type, and corresponds to a steering shaft 10 to which a vehicle steering wheel H is fixed, a rack and pinion motion conversion mechanism 11, and a steering torque applied to the steering wheel H. A rotating electrical machine 12 that generates auxiliary steering torque, a worm reduction mechanism 13 that is interposed between the rotating electrical machine 12 and the steering shaft 10 and decelerates the rotation of the rotating electrical machine 12, and a control unit 14 that controls driving of the rotating electrical machine 12. Etc.

  The steering shaft 10 has a steering input shaft 10 a and a steering output shaft 10 b and is covered with a housing 20. A steering wheel H is fixed to the upper end of the steering input shaft 10a. The steering input shaft 10a and the steering output shaft 10b are connected via a torsion bar of the torque sensor 21. The steering torque generated by the operation of the steering wheel H is detected by the torque sensor 21 through the steering input shaft 10a and output to the control unit 14, and the output of the rotating electrical machine 12 is output by the control unit 14 based on the detected steering torque. Be controlled.

  For example, as shown in FIG. 2, the worm reduction mechanism 13 includes a worm wheel 30 attached to the steering output shaft 10 b and a worm 31 that meshes with the outer peripheral gear of the worm wheel 30. The worm 31 is supported by two bearings 33 and 34 fixed to the housing 32. One end of the worm 31 is coaxially coupled to the shaft 60 of the rotating electrical machine 12 by a spline structure. Thus, for example, the axial reaction force received by the worm 31 by driving the steering output shaft 10 b and the worm wheel 30 can be absorbed by the worm reduction mechanism 13.

  As shown in FIG. 1, the steering output shaft 10 b and the rack and pinion motion conversion mechanism 11 are connected by two universal joints 40 and 41 and a connecting member 42. The rack and pinion motion conversion mechanism 11 connects the steering output shaft 10b and the tie rod of the operation wheel by a rack and pinion gear.

  The rotational force output from the rotating electrical machine 12 is transmitted to the steering output shaft 10b as auxiliary steering torque via the worm reduction mechanism 13, and the auxiliary steering torque is transmitted from the steering output shaft 10b to the rack and pinion motion conversion mechanism 11. To the tie rod of the operation wheel.

  Next, the configuration of the rotating electrical machine 12 will be described. FIG. 3 is a front view of the rotating electrical machine 12 as seen from the front side. 4 is a cross-sectional view of the rotating electrical machine 12 taken along line II shown in FIG. 3, FIG. 5 is a cross-sectional view of the rotating electrical machine 12 taken along line II-II shown in FIG. 3, and FIG. It is sectional drawing of the rotary electric machine 12 along the I-III line shown in FIG. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  For example, as shown in FIGS. 3 and 4, the rotating electrical machine 12 includes a bottomed cylindrical case 50, a lid 51 that closes the opening of the case 50, a flange member 52 that can be attached to the outer periphery of the case 50, and the like. Have.

  The case 50 has, for example, a bottomed cylindrical shape in which the front side in the axial direction (left side in FIG. 4) is open and the rear side (right side in FIG. 4) is closed. The lid 51 closes the opening on the front side of the case 50.

As shown in FIGS. 3 and 5, a mounting portion 50 a protruding outward is formed at the front end of the case 50 for mounting the lid portion 51 and the flange member 52. A through hole 50b is formed in the attachment portion 50a. The attachment portions 50a are formed at a plurality of locations, for example, at two locations facing each other on the diameter of the case 50 as shown in FIG.

 As shown in FIG. 5, a rotor 61 that rotates the shaft 60 and a stator 62 that is fixed to the case 50 are provided in the case 50.

The stator 62 is fixed to the inner wall surface of the case 50. The stator 62 is fixed to the case 50 by press fitting, bonding, shrink fitting or the like. The stator 62 has a cylindrical stator core 70. An insulator 71 is inserted into the stator core 70, and a coil 72 is wound around in this state. In the case of a three-phase motor, 3n (n is an integer) stator cores may be integrated by press fitting, welding, or the like for each yoke part (back yoke). The stator core that is not integrated may be press-fitted into the case 50.

  The rotor 61 is installed inside the stator 62. The rotor 61 has a rotor core inside, and the shaft 60 penetrates the shaft center thereof. Further, 2n segment magnets (n is an integer) or a ring magnet is provided on the outer peripheral surface of the rotor core. The outer periphery of the rotor core may be provided with irregularities on the surface in contact with the segment magnet. An embedded magnet type in which magnets are arranged may be used inside the rotor core. The rotor cover is made of a thin non-magnetic material (for example, stainless steel, aluminum, heat-shrinkable tube, etc.), and can be installed by press fitting, shrink fitting, welding, or the like from the rotor axial direction.

A recess 50c is formed at the bottom center of the rear surface side of the case 50, and a bearing 80 that supports the rear surface side of the shaft 60 is provided in the recess 50c.

  A terminal block 90 that is electrically connected to the coil 72 of the stator 62 is installed on the front surface side of the stator 62. The terminal block 90 is electrically connected to a bus bar 91 as a power supply line for supplying power to the stator 62. The bus bar 91 is connected to a power supply terminal 112 (described later) of the control unit 14 through a through hole 50 d provided in the case 50. A grommet 92 is provided in the through hole 50 d, and the bus bar 91 communicates with the outside of the case 50 through the inside of the grommet 92.

The lid 51 is formed in a thin circular shape, for example. The lid 51 has a through hole 51a through which the front side of the shaft 60 passes in the center, a rear recess 51b provided in the center on the rear surface side of the lid 51, and a front recess 51c provided in the center of the surface on the front side. Is provided. The rear recess 51b is provided with a bearing 100 that supports the front side of the shaft 60, and the front recess 51c is provided with a resolver sensor 101 that detects the rotational position of the shaft 60 by the rotor 61.

The resolver sensor 101 includes a cylindrical resolver rotor 102 that is press-fitted into a shaft 60, and a resolver stator 103 that surrounds the outer periphery of the resolver rotor 102. The resolver stator 103 is fixed to the front recess 51c by press fitting, caulking, welding or the like. A sensor harness 104 as a signal line for sending a detection signal to the control unit 14 is electrically connected to the resolver stator 103. The sensor harness 104 passes through the case 50 and is pulled out through a through hole 51d provided in the outer peripheral edge of the lid 51 shown in FIG. 3, and the connector 104a provided at the distal end is connected to the control unit 14. It is connected to a sensor connector 111 as a sensor terminal to be described later.

As shown in FIGS. 3 and 5, the lid portion 51 is formed with an attachment portion 51 e protruding outward for attaching the case 50 and the flange member 52. The attachment portion 51e is formed with a long hole through-hole 51f in an arc shape. With the long through hole 51f, the attachment position in the circumferential direction of the lid 51 can be adjusted, and the initial position of the resolver sensor 101 can be adjusted. The attachment portions 51e are formed at a plurality of locations, for example, two locations facing each other on the diameter of the lid portion 51.

For example, as shown in FIG. 6, the flange member 52 has a circular case insertion hole 52a into which the case 50 can be inserted, for example. The case insertion hole 52a has a diameter slightly larger than the diameter on the front surface side of the case 50 so that the flange member 52 can be installed on the outer peripheral surface on the front surface side of the case 50 by inserting the case 50 from the bottom side of the case 50, for example. have. On the outer peripheral portion of the flange member 52, an external attachment portion 52b for attachment to the worm reduction mechanism 13 which is an attachment object of the rotating electrical machine 12 is formed. The external mounting portions 52b are formed at a plurality of locations, for example, at two locations facing each other on the diameter of the case insertion hole 52a as shown in FIG. For example, a screw hole 52c is formed in the external attachment portion 52b, and the rotating electrical machine 12 can be attached to the worm reduction mechanism 13 by fitting a screw into the screw hole 52c.

  Further, as shown in FIG. 5, screw holes 52 d for attaching to the lid portion 51 and the case 50 are formed in the outer peripheral portion of the flange member 52. As shown in FIG. 3, the screw holes 12d are formed at a plurality of locations, for example, two locations facing each other on the diameter of the case insertion hole 52a. By fixing the bolt member 105 through the screw hole 52d of the flange member 52, the through hole 51f of the lid portion 51, and the through hole 50b of the case 50, the flange member 52, the lid portion 51, and the case 50 can be fixed to each other.

  As shown in FIGS. 3 and 4, the control unit 14 is provided integrally with the flange member 52 of the rotating electrical machine 12. The control unit 14 is covered with the housing 110. A sensor connector 111 that electrically connects the sensor harness 104 is provided on the front side (the front side in the axial direction) of the housing 110. The sensor connector 111 is provided adjacent to the case insertion hole 52a. A recess 110a is formed on the front side of the housing 110, and a plurality of, for example, three power supply terminals 112 that electrically connect the bus bar 91 are provided in the recess 110a. The bus bar 91 can be attached to the power supply terminal 112 by turning the screw 113 inserted from the front side. The recess 110a is formed adjacent to the case insertion opening 52a, for example, next to the sensor connector 111. The control unit 14 can obtain information on the steering torque detected by the torque sensor 21 and rotational position information detected by the resolver sensor 101. The control unit 14 can control the driving of the rotating electrical machine 12 by supplying power to the stator 62 through the bus bar 91 based on the steering torque information and the like.

When assembling the rotating electrical machine 12 configured as described above, for example, as shown in FIG. 7A, the flange member 52 is fitted into the outer peripheral surface of the case 50 from the bottom side of the case 50, and FIG. As shown in FIG. Thereafter, the bus bar 91 is connected to the power supply terminal 112 on the front surface side of the control unit 14 by screws 113. Further, the connector 104 a of the sensor harness 104 is connected to the sensor connector 111 on the front side of the control unit 14.

Next, the bolt 105 is fitted from the front side into the through hole 51f of the lid portion 51, the through hole 50b of the case 50, and the screw hole 52d of the flange member 52, and the flange member 52, the case 50, and the lid portion 51 are temporarily fixed. The

Thereafter, the rotor 61 is rotated, and the position of the resolver sensor 101 is adjusted by rotating the lid 51 so that the induced voltage generated at that time matches the rotational position signal detected by the resolver sensor 101. After the adjustment, the lid 51 is fixed to the flange member 52 and the case 50 with the bolt 105. Thereafter, a screw is fitted into the screw hole 52 c of the external attachment portion 52 b of the flange member 52, and the rotating electrical machine 12 is attached to the worm reduction mechanism 13.

  According to the above embodiment, since the sensor harness 104 of the resolver sensor 101 can be connected to the sensor connector 111 on the front surface of the control unit 14, the sensor compared to the conventional case where the sensor harness 104 is connected to the side surface of the control unit 14. The harness 104 can be shortened. As a result, noise is suppressed from entering the sensor harness 104, and the accuracy of the resolver sensor 101 can be improved. Therefore, the accuracy of rotation of the rotating electrical machine 12 can be improved.

  Moreover, since the flange member 52 can be attached to the outer periphery of the case 50, the flange member 52 overlaps with the outer periphery of the case 50, and the length of the rotating electrical machine 12 in the axial direction can be shortened accordingly. Therefore, the mountability of the rotating electrical machine 12 can be improved.

  Since the sensor connector 111 is provided adjacent to the case insertion hole 52a, the sensor connector 111 becomes closer to the resolver sensor 101 and the sensor harness 104 can be shortened.

  Since the power supply terminal 112 of the bus bar 91 is provided on the front surface of the same control unit 14 as the sensor connector 111, the connection work to the terminals 111 and 112 of the bus bar 91 and the sensor harness 104 can be performed easily and quickly. .

  Further, the lid portion 51, the flange member 52, and the case 50 can be attached to each other by a screw 105 inserted from the front side, and the bus bar 91 can be attached to the power supply terminal 112 by a screw 113 inserted from the front side. . For this reason, the attachment between the lid 51, the flange member 52 and the case 50 and the attachment of the bus bar 91 to the power supply terminal 112 can be realized by turning the screws from the same direction. Can be done. Moreover, since it can be performed from the front side including the connection of the sensor harness 104 to the sensor connector 111, the assembly of the rotating electrical machine 12 can also be performed quickly.

  Since the flange member 52 can be attached to the attachment portion 50a by inserting the case 50 from the bottom side of the case 50, the flange member 52 is attached to the case 50 by inserting the case 50 from the bottom side with less wiring. be able to. Therefore, the flange member 52 can be easily attached.

  According to the above-described embodiment, the sensor harness 104 of the resolver sensor 101 can be shortened to increase the accuracy of the resolver sensor 101. Therefore, the electric power steering device 1 with high rotation accuracy of the rotating electrical machine 12 can be realized.

In the above embodiment, the bus bar 91 is connected to the power supply terminal 112 by the screw 113. However, an elastic force is applied to the bus bar 91, and the bus bar 91 is pressed against the power supply terminal 112 by the elastic force to electrically You may make it connect. In such a case, for example, as shown in FIG. 8, a plurality of plate-shaped power supply terminals 112 are formed on the front surface of the control unit 14. The power supply terminals 112 are arranged side by side along the outer periphery of the case insertion hole 52a. As shown in FIG. 9, the bus bar 91 extends from the terminal block 90 through the grommet 92 toward the outer side in the radial direction of the case 50, and the front end portion 91 a is elastically deformed and folded back. The distal end portion 91a is urged toward the rear side by the elastic force and is pressed and connected to the power supply terminal 112. The state where the front end portion 91 a of the bus bar 91 is pressed against the power supply terminal 112 is maintained by fastening the case 50 and the flange member 52 with the bolt 105.

 According to such an example, the bus bar 91 can be attached to the power supply terminal 112 without using screws, so that the work for assembling the rotating electrical machine 12 can be reduced and the assembly can be speeded up. Further, since the number of parts is reduced, the cost can be reduced.

Further, in the above embodiment, the sensor harness 104 passes through the inside of the lid 51 and out of the through hole 51d, but passes from the resolver sensor 101 to the outside of the lid 51 as shown in FIG. May be connected to the sensor connector 111.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the idea described in the claims, and these naturally belong to the technical scope of the present invention. It is understood.

  For example, the configuration in the case 10 described in the above embodiment may be another configuration. For example, the bearing 100 is placed in the front recess 51c outside the lid 51 at a position where the resolver sensor 101 and the bearing 100 are reversed. And the resolver sensor 101 may be provided in the rear recess 51b inside the lid 51. Moreover, in the said embodiment, although the rotary electric machine 12 was shown as the example applied to the electric power steering apparatus 1, this invention is applicable also to the rotary electric machine of the apparatus of another use.

The present invention is useful when realizing a rotating electric machine with a short signal line of a resolver sensor.

DESCRIPTION OF SYMBOLS 1 Electric power steering apparatus 12 Rotating electrical machine 14 Control unit 50 Case 51 Lid part 52 Flange member 52a Case insertion hole 52b Attachment part 60 Shaft 61 Rotor 62 Stator 90 Electric power steering apparatus 91 Bus bar 101 Resolver sensor 104 Sensor harness 111 Sensor connector 112 Electric power feeding Terminal

Claims (7)

A bottomed cylindrical case for housing the rotor and stator;
A lid that closes the opening of the case and passes the output shaft of the rotor;
A flange member having a case insertion hole into which the case can be inserted in the direction of the output shaft, and capable of being attached to the outer periphery of the case, and having an external attachment part for attaching the rotating electrical machine to the attachment object;
A control unit provided on the flange member for controlling the driving of the rotating electrical machine;
A resolver sensor that is provided on the front surface side or the rear surface side of the lid in the output shaft direction and detects the rotational position of the output shaft of the rotor;
A rotating electrical machine, wherein a sensor terminal to which a signal line of the resolver sensor is connected is provided on a front surface of the control unit in the output shaft direction.   The rotating electrical machine according to claim 1, wherein the sensor terminal is provided adjacent to the case insertion hole.   The rotating electrical machine according to claim 1 or 2, wherein a power supply terminal to which a power supply line for supplying power to the stator is connected is provided on a front surface of the control unit in the output shaft direction. The lid, the flange member, and the case can be attached to each other by screws inserted from the front side in the output shaft direction,
The rotating electrical machine according to claim 3, wherein the power supply line can be attached to the power supply terminal by a screw inserted from the front side in the output shaft direction.   The rotating electrical machine according to claim 3, wherein the power supply line has an elastic force and is pressed and connected to the power supply terminal by the elastic force. An attachment portion for attaching the flange member is formed on the outer peripheral portion of the case,
The rotating electrical machine according to claim 1, wherein the flange member can be attached to the attachment portion by inserting the case from a bottom side of the case.   An electric power steering apparatus comprising the rotating electrical machine according to claim 1.

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