JP2022058306A - Electric actuator - Google Patents

Abstract

To provide an electric actuator which can suppress performance deterioration of a motor.SOLUTION: One embodiment of an electric actuator comprises: a motor part 20; a magnet 40; a bus bar 150; a bus bar holder 140 which holds the bus bar 150; a magnetic sensor 63 which is fixed to the bus bar holder 140, and can detect a magnetic field of the magnet 40; a conductive wire 64 electrically connected with the magnetic sensor 63; and a circuit board 70 electrically connected with the motor part 20. The magnetic sensor 63 is arranged opposite to one side in an axial direction of the magnet 40 via a gap, the conductive wire 64 penetrates the bus bar holder 140 from the inside of the bus bar holder 140, and is electrically connected with the circuit board 70.SELECTED DRAWING: Figure 3

Description

The present invention relates to an electric actuator.

It is known that in the rotation control of a motor in an electric actuator, a change in a magnetic field is detected by a magnetic sensor. For example, Patent Document 1 discloses a configuration in which a magnet is attached to a motor shaft so as to have the same phase as the magnetic poles of a rotor by a magnetic sensor arranged on a circuit board. A method of directly detecting the magnetic pole of the rotor with a magnetic sensor without attaching a magnet to the motor shaft is also generally used.

Japanese Unexamined Patent Publication No. 2019-198191

In the method of directly detecting the magnetic poles of the rotor with a magnetic sensor, the magnets installed so as to be in phase with the magnetic poles of the rotor and the rotor are out of phase, resulting in a delay in the energization timing caused by the deviation of the detection timing by the sensor. There is a risk that the performance of the motor will deteriorate.

The present invention has been made in consideration of the above points, and an object of the present invention is to provide an electric actuator capable of suppressing deterioration of motor performance.

One aspect of the electric actuator of the present invention is a motor portion having a rotor rotatable about a central axis extending in the axial direction, a stator facing the rotor in the radial direction through a gap, and the rotor fixed to the rotor. A magnet, a bus bar electrically connected to the motor unit, a bus bar holder arranged on one side in the axial direction of the rotor and holding the bus bar, and fixed to the bus bar holder so that the magnetic field of the magnet can be detected. A magnetic sensor, a conductive wire electrically connected to the magnetic sensor, and a circuit board arranged on one side of the bus bar holder in the axial direction and electrically connected to the motor unit. The sensors are arranged so as to face each other on one side in the axial direction of the magnet via a gap, and the conductive wire penetrates the bus bar holder from the inside of the bus bar holder and is electrically connected to the circuit board. There is.

According to one aspect of the present invention, in an electric actuator, deterioration of motor performance can be suppressed.

FIG. 1 is a cross-sectional view showing the electric actuator of the first embodiment. FIG. 2 is a cross-sectional view showing the electric actuator of the first embodiment, and is a cross-sectional view taken along the line II-II in FIG. FIG. 3 is a schematic cross-sectional view showing a part of the electric actuator of the first embodiment. FIG. 4 is a cross-sectional view showing the bus bar holder of the second embodiment. FIG. 5 is a cross-sectional view showing the bus bar holder of the second embodiment, and is a cross-sectional view taken along the line VV in FIG. FIG. 6 is a cross-sectional view showing a part of the procedure for fixing the bus bar holder and the magnetic sensor of the second embodiment.

Hereinafter, the electric actuator according to the embodiment of the present invention will be described with reference to the drawings. The scope of the present invention is not limited to the following embodiments, and can be arbitrarily changed within the scope of the technical idea of the present invention. Further, in the following drawings, in order to make each configuration easy to understand, the scale and number of each structure may be different from the actual structure.

In each figure, the Z-axis direction is a vertical direction with the positive side as the upper side and the negative side as the lower side. The axial direction of the central axis J1 shown in each figure is parallel to the Z-axis direction, that is, the vertical direction. In the following description, unless otherwise specified, the direction parallel to the axial direction of the central axis J1 is simply referred to as "axial direction". Unless otherwise specified, the radial direction centered on the central axis J1 is simply referred to as "diametrical direction", and the circumferential direction centered on the central axis J1 is simply referred to as "circumferential direction".

In the following embodiments, the upper side corresponds to one side in the axial direction, and the lower side corresponds to the other side in the axial direction. It should be noted that the upper side and the lower side are simply names for explaining the relative positional relationship of each part, and the actual arrangement relationship or the like may be an arrangement relationship or the like other than the arrangement relationship or the like indicated by these names. ..

<First Embodiment>
The electric actuator 10 of the present embodiment shown in FIGS. 1 to 3 is, for example, an electric actuator mounted on a vehicle. As shown in FIGS. 1 and 3, the electric actuator 10 includes a case 11, a partition member 15, a motor portion 20 having a motor shaft 21 that rotates about a central axis J1, a first bearing 53, and a second bearing. It includes a bearing 51, a third bearing 52, a reduction mechanism 30, an output shaft 41, a magnetic sensor 63, a circuit board 70, and a bus bar holder 140.

As shown in FIG. 1, the case 11 houses a partition member 15, a motor unit 20, a motor shaft 21, a reduction mechanism 30, an output shaft 41, a magnetic sensor 63, a circuit board 70, and a bus bar holder 140. The case 11 has a lower case 11A that opens upward and an upper case 11B that is fixed to the opening of the lower case 11A.

The lower case 11A has a cylindrical shape extending in the axial direction about the central axis J1. The lower case 11A has a substrate accommodating portion 13a, a case cylinder portion 13b, an output portion accommodating portion 13c, and a bearing holding portion 13d. The board accommodating portion 13a is a portion accommodating the circuit board 70 and the bus bar holder 140. The substrate accommodating portion 13a opens upward. The substrate accommodating portion 13a is configured inside the upper portion of the lower case 11A in the radial direction. The bottom surface of the board accommodating portion 13a is a support surface 12 that supports and fixes the circuit board 70 and the bus bar holder 140. The support surface 12 faces upward.

The case cylinder portion 13b surrounds the radial outside of the motor portion 20. The output unit accommodating unit 13c is a portion accommodating the output unit 46 described later. The bearing holding portion 13d holds the third bearing 52. The bearing holding portion 13d extends upward from the lower end portion of the case 11 with the central axis J1 as the center.

The upper case 11B is a container-shaped member having a recess 16a that opens downward. The upper case 11B and the lower case 11A are fastened by a plurality of bolts that penetrate the upper case 11B in the axial direction. In the present embodiment, the upper case 11B corresponds to a lid portion that covers the opening of the lower case 11A from above. The upper case 11B has a bearing holding portion 16b. The bearing holding portion 16b holds the first bearing 53. The bearing holding portion 16b extends downward with the central axis J1 as the center.

The central axis of the motor unit 20 is the central axis J1. As shown in FIG. 1, the motor unit 20 includes a rotor 22 and a stator 23. The rotor 22 includes a motor shaft 21, a rotor core 22a, and a magnet 40.

The motor shaft 21 includes a first shaft portion 21a, a second shaft portion 21b, and a through hole 25. The first shaft portion 21a extends in the axial direction and is located above the motor shaft 21. The second shaft portion 21b extends in the axial direction and is located below the motor shaft 21. The diameter of the second shaft portion 21b is larger than the diameter of the first shaft portion 21a. More specifically, the outer diameter of the second shaft portion 21b is larger than the outer diameter of the first shaft portion 21a. The second shaft portion 21b is an eccentric shaft portion centered on the eccentric shaft J2 that is eccentric with respect to the central shaft J1. The eccentric axis J2 is parallel to the central axis J1. The through hole 25 extends about the central axis J1. Therefore, the first shaft portion 21a has a cylindrical shape extending about the central shaft J1. The second shaft portion 21b has an axially recessed portion 26 on the lower side. The recessed portion 26 extends about the eccentric axis J2. Therefore, the second shaft portion 21b has a cylindrical shape extending about the eccentric shaft J2. The upper side of the recess 26 is connected to the lower side of the through hole 25. In the motor shaft 21, the second shaft portion 21b is rotatably supported around the eccentric shaft J2 by the third bearing 52.

The output shaft 41 transmits the rotation of the motor shaft 21 via the reduction mechanism 30.
The output shaft 41 has a shaft portion 41a and a connecting portion 42. The shaft portion 41a is located on the upper side, and the connecting portion 42 is located on the lower side. The shaft portion 41a is a columnar shape extending around the central shaft J1. The upper side of the shaft portion 41a is passed through the through hole 25 of the motor shaft 21. The upper end of the shaft portion 41a projects upward from the motor shaft 21. The upper end of the shaft portion 41a protruding upward from the motor shaft 21 is rotatably supported around the central shaft J1 by the first bearing 53. The upper end of the motor shaft 21 is supported by the case 11 via the first bearing 53.

The lower end of the connecting portion 42 projects below the motor shaft 21. The lower end of the connecting portion 42 projecting to the lower side of the motor shaft 21 is rotatably supported around the central axis J1 by the second bearing 51. The lower end of the motor shaft 21 is supported by the case 11 via a second bearing 51. The end of the output shaft 41 in the axial direction is rotatably supported around the central axis J1 by the first bearing 53 and the second bearing 51. Therefore, the motor shaft 21 through which the shaft portion 41a of the output shaft 41 is passed through the through hole 25 is rotatably supported around the central shaft J1 by the shaft portion 41a.

The first bearing 53, the second bearing 51, and the third bearing 52 are rolling bearings having an inner ring and an outer ring located radially outside the inner ring, respectively. In the present embodiment, the first bearing 53, the second bearing 51, and the third bearing 52 are ball bearings in which, for example, an inner ring and an outer ring are connected via a plurality of balls.

The upper side of the connecting portion 42 is inserted into the recessed portion 26 of the motor shaft 21. Since the upper side of the connecting portion 42 is inserted into the recessed portion 26 of the motor shaft 21, the axial length of the output shaft 41 can be shortened. Therefore, the axial length of the electric actuator 10 can be shortened to reduce the size.

The connecting portion 42 has a cylindrical tubular portion 44 extending about the central axis J1. A connecting recess 45 is provided in the inner diameter of the tubular portion 44. The connecting recess 45 is recessed upward from the lower end of the output shaft 41. The connecting recess 45 has a substantially circular shape centered on the central axis J1 when viewed along the axial direction. A plurality of spline grooves are provided on the inner peripheral surface of the connecting recess 45 along the circumferential direction. Another member that outputs the driving force of the electric actuator 10 is inserted into the connecting recess 45 and connected. Other members are, for example, manual shafts in vehicles. The electric actuator 10 drives the manual shaft based on the shift operation of the driver, and switches the gear of the vehicle.

Since the connecting portion 42 has the connecting recess 45 recessed upward, the axial length of the output shaft 41 can be shortened as compared with the case where the connecting portion 42 has a shaft shape protruding downward. Therefore, the axial length of the electric actuator 10 can be shortened to reduce the size. The first bearing 53 is held by the bearing holding portion 16b provided in the case 11, and the second bearing 51 is held by the bearing holding portion 13d provided in the case 11, so that the output shaft 41 is coaxial with the central axis J1. The degree can be improved. The first bearing 53 is held by the bearing holding portion 16b provided in the case 11, and the second bearing 51 is held by the bearing holding portion 13d provided in the case 11, so that the first bearing 53 and the second bearing 51 are held. It is not necessary to separately provide the bearing, which can contribute to cost reduction and miniaturization of the electric actuator 10.

The rotor core 22a is fixed to the outer peripheral surface of the motor shaft 21. More specifically, the rotor core 22a is fixed to the outer peripheral surface of the first shaft portion 21a. The peripheral edge of the rotor core 22a is supported from below by a partition member 15 described later, which is supported from below by the lower case 11A. The partition member 15 is a support member that supports the rotor core 22a from below. The magnet 40 is fixed to the outside of the rotor core 22a in the radial direction. A plurality of magnets 40 are arranged at intervals in the circumferential direction.

The stator 23 is located radially outside the rotor 22. The stator 23 has a stator core 23a and a plurality of coils 23b. The stator core 23a is an annular shape that surrounds the radial outer side of the rotor 22. The outer peripheral surface 24a of the stator core 23a is fixed to the inner peripheral surface of the case cylinder portion 13b. The plurality of coils 23b are mounted on the teeth of the stator core 23a, for example, via an insulator (not shown).

As shown in FIG. 2, the stator 23 has an outer peripheral surface 24b on the inner side in the radial direction with respect to the outer peripheral surface 24a. The outer peripheral surface 24b is arranged for each magnetic pole. The outer peripheral surface 24b when viewed in the axial direction is orthogonal to the center of the magnetic pole in the circumferential direction. The outer peripheral surface 24b of the stator 23 is provided with a groove portion 27 that is recessed inward in the radial direction. The groove portion 27 extends in the axial direction. The groove portions 27 are arranged on the upper side and the lower side of the outer peripheral surface 24a of the stator core 23a, respectively. A plurality of groove portions 27 are arranged at intervals in the circumferential direction.

The bus bar holder 140 is arranged above the rotor 22. The bus bar holder 140 has a ring plate shape. As shown in FIG. 1, the bus bar holder 140 has a spacer 143. The spacer 143 has a cylindrical shape extending in the axial direction. The spacer 143 projects upward from the bus bar holder 140. The upper end of the spacer 143 is in contact with the lower side of the circuit board 70. The bus bar holder 140 and the circuit board 70 are screwed to the support surface 12 of the lower case 11A by bolts 144 penetrating the circuit board 70 and the spacer 143 from above. For example, three bolts 144 are provided. The bus bar holder 140 and the circuit board 70 are screwed from above with bolts 144 at positions where they overlap the spacer 143 when viewed in the axial direction. The screwed circuit board 70 is arranged on the upper side of the bus bar holder 140 with a gap. The dimension of the gap between the circuit board 70 and the bus bar holder 140 is the dimension in which the spacer 143 projects upward from the bus bar holder 140.

The bus bar holder 140 has a peripheral wall portion 141 extending downward. The peripheral wall portion 141 is located radially outside the outer peripheral surface 24b of the stator 23. The peripheral wall portion 141 is located radially inside the outer peripheral surface 24a of the stator 23. The lower end of the peripheral wall portion 141 comes into contact with the upper side of the stator 23 when the bus bar holder 140 is screwed to the support surface 12.

When the bus bar holder 140 is screwed to the support surface 12 of the lower case 11A, the lower end of the peripheral wall portion 141 comes into contact with the upper side of the stator 23, so that the stator 23 is supported from the lower side by the partition member 15. Is axially positioned and fixed to the lower case 11A.

As shown in FIG. 2, the peripheral wall portion 141 of the bus bar holder 140 has a protrusion 142 protruding inward in the radial direction. The protrusion 142 extends in the axial direction. The position of the protrusion 142 in the circumferential direction of the protrusion 142 is the same as the position of the groove 27 of the stator 23 in the circumferential direction. The protrusion 142 faces the groove 27 in the radial direction. The protrusion 142 protruding inward in the radial direction of the peripheral wall portion 141 is inserted into the groove portion 27. The bus bar holder 140 in which the protrusion 142 is inserted into the groove 27 is positioned in the circumferential direction with the stator 23. When the bus bar holder 140 is accommodated in the substrate accommodating portion 13a while inserting the protrusion 142 from the upper side with respect to the groove portion 27 opening on the upper side, the bus bar holder 140 is positioned in the circumferential direction with respect to the stator 23 and the lower case 11A. can. Therefore, when the bus bar holder 140 is screwed to the support surface 12 of the lower case 11A, the bus bar holder 140, the stator 23, and the lower case 11A can be positioned with each other in the circumferential direction and the axial direction.

The bus bar holder 140 holds a magnetic sensor 63, a conductive wire 64, and a plurality of bus bars 150. In the present embodiment, the bus bar holder 140, the magnetic sensor 63, the conductive wire 64, the spacer 143, and the plurality of bus bars 150 are resin-molded and integrated bodies. More specifically, the bus bar holder 140 is made by insert molding using a magnetic sensor 63, a conductive wire 64, a spacer 143, and a bus bar 150 as insert members.

The magnetic sensor 63 can detect the magnetic field of the magnet 40. The magnetic sensor 63 is, for example, a Hall element. The magnetic sensor 63 is fixed to the lower side of the bus bar holder 140. The magnetic sensor 63 is arranged on the upper side of the magnet so as to face each other with a gap. As shown in FIG. 2, three magnetic sensors 63 are arranged at intervals in the circumferential direction. The circumferential spacing between the magnetic sensors 63 is the same as the circumferential spacing of the magnetic poles. The magnetic sensor 63 detects the rotation position of the magnet 40 by detecting the magnetic field of the magnet 40, and detects the rotation of the motor shaft 21.

According to the electric actuator 10 of the present embodiment, the magnetic sensor 63 arranged so as to face the magnet 40 under the bus bar holder 140 directly detects the magnetic field of the magnet 40, so that the detection timing by the magnetic sensor 63 is deviated. Hard to occur. Therefore, according to the electric actuator 10 of the present embodiment, the phase shift between the magnet 40 and the rotor 22 can be suppressed. By suppressing the phase shift between the magnet 40 and the rotor 22, the delay in the energization timing due to the shift in the detection timing by the magnetic sensor 63 can be suppressed, and the deterioration of the motor performance can be suppressed. According to the electric actuator 10 of the present embodiment, since the magnetic sensor 63 is provided in the bus bar holder 140, an extra substrate for mounting the magnetic sensor is not required separately. According to the electric actuator 10 of the present embodiment, the magnetic sensor 63 and the bus bar holder 140 are resin-molded and integrated, and the bus bar holder 140 is assembled by screwing it to the support surface 12 of the lower case 11A. Occasionally, it can be positioned in the circumferential direction and the axial direction with the stator 23. According to the electric actuator 10 of the present embodiment, it is possible to prevent the advance angle deviation from occurring depending on the assembly accuracy and the deterioration of the rotation control accuracy of the motor.

One end of the conductive wire 64 is electrically connected to the magnetic sensor 63. The conductive wire 64 may be a terminal extending from the magnetic sensor 63, or may be a bus bar having one end connected to the magnetic sensor 63. The conductive wire 64 penetrates the bus bar holder 140 from the inside of the bus bar holder 140, and the other end side is electrically connected to the circuit board 70 by a connection method such as soldering, welding, or press fitting.

The circuit board 70 has a plate shape extending in a plane orthogonal to the axial direction. The circuit board 70 is housed in the lower case 11A. More specifically, the circuit board 70 is housed in the board accommodating portion 13a. The circuit board 70 is a board that is electrically connected to the motor unit 20. The circuit board 70 controls, for example, the current supplied to the motor unit 20. That is, for example, an inverter circuit is mounted on the circuit board 70.

As shown in FIG. 3, one end 150a of the bus bar 150 grips the coil leader wire drawn from the coil 23b of the stator 23 and is connected to the coil 23b by soldering or welding. The other end 150b of the bus bar 150 projects upward from the upper surface of the bus bar holder 140. In the present embodiment, the other end portion 150b of the bus bar 150 penetrates the circuit board 70 from the lower side to the upper side. The end portion 150b is electrically connected to the circuit board 70 at a position penetrating the circuit board 70 by a connection method such as soldering, welding, or press fitting. As a result, the circuit board 70 is electrically connected to the motor unit 20 via the bus bar 150.

The deceleration mechanism 30 is arranged on the radial outside of the second shaft portion 21b of the motor shaft 21 and the radial outside of the connecting portion 42 of the output shaft 41. The deceleration mechanism 30 is arranged below the motor unit 20. The partition member 15 is arranged between the stator 23 and the speed reduction mechanism 30 in the axial direction. The reduction mechanism 30 has an external tooth gear 31, an internal tooth gear 32, an output unit 46, and a plurality of projecting portions 43.

The external tooth gear 31 has an annular plate shape extending in the radial direction of the eccentric shaft J2 with the eccentric shaft J2 of the second shaft portion 21b as the center. A gear portion is provided on the radial outer surface of the external tooth gear 31. The gear portion of the external tooth gear 31 has a plurality of tooth portions arranged along the outer circumference of the external tooth gear 31.

The external tooth gear 31 is connected to the motor shaft 21. More specifically, the external tooth gear 31 is connected to the second shaft portion 21b of the motor shaft 21 via a third bearing 52. As a result, the motor shaft 21 is connected to the deceleration mechanism 30. The external tooth gear 31 is fitted to the outer ring of the third bearing 52 from the outside in the radial direction. The second shaft portion 21b is fitted to the inner ring of the third bearing 52 from the outside in the radial direction. As a result, the third bearing 52 connects the motor shaft 21 and the external tooth gear 31 so as to be relatively rotatable around the eccentric shaft J2.

In the present embodiment, the external tooth gear 31 has a plurality of holes 31a. In the present embodiment, the hole portion 31a penetrates the external tooth gear 31 in the axial direction. The plurality of hole portions 31a are arranged along the circumferential direction. More specifically, the plurality of hole portions 31a are arranged at equal intervals over one circumference along the circumferential direction centered on the eccentric axis J2. The hole portion 31a has a circular shape when viewed in the axial direction. The inner diameter of the hole 31a is larger than the outer diameter of the protruding portion 43. The hole portion 31a may be a hole having a bottom portion.

The internal tooth gear 32 is located radially outside the external tooth gear 31 and is an annular shape surrounding the external tooth gear 31. In the present embodiment, the internal tooth gear 32 is an annular shape centered on the central axis J1. The radial outer edge portion of the internal tooth gear 32 is arranged and fixed to the stepped portion 13e provided on the inner peripheral surface of the case cylinder portion 13b and recessed in the radial direction. As a result, the deceleration mechanism 30 is held in the lower case 11A. The internal tooth gear 32 meshes with the external tooth gear 31. A gear portion is provided on the radial inner surface of the internal tooth gear 32. The gear portion of the internal tooth gear 32 has a plurality of tooth portions arranged along the inner circumference of the internal tooth gear 32. In the present embodiment, the gear portion of the internal tooth gear 32 meshes with the gear portion of the external tooth gear 31 only in a part in the circumferential direction.

The output unit 46 has an annular plate shape that extends in the radial direction about the central axis J1. The output unit 46 is located below the external tooth gear 31. The output unit 46 is fixed to the outer peripheral surface of the output shaft 41. More specifically, the output unit 46 is fixed to the outer peripheral surface of the connecting portion 42 of the output shaft 41.

The plurality of protrusions 43 are fixed to the output portion 46, for example, by welding. The plurality of protruding portions 43 project upward from the output portion 46. That is, the plurality of protruding portions 43 project from the output portion 46 toward the external tooth gear 31. The protrusion 43 is columnar. The plurality of protrusions 43 are arranged along the circumferential direction. More specifically, the plurality of protrusions 43 are arranged at equal intervals over one circumference along the circumferential direction centered on the central axis J1. The number of protrusions 43 is, for example, eight.

The plurality of projecting portions 43 are inserted into the plurality of hole portions 31a, respectively. The outer peripheral surface of the protruding portion 43 is inscribed with the inner peripheral surface of the hole portion 31a. As a result, the plurality of projecting portions 43 swingably support the external tooth gear 31 around the central axis J1 via the inner side surface of the hole portion 31a.

In the present embodiment, the hole portion 31a and the protruding portion 43 overlap with the third bearing 52 and the second shaft portion 21b when viewed along the radial direction. In other words, each of the hole portion 31a, the protruding portion 43, the third bearing 52, and the second shaft portion 21b has a portion located at the same position in the axial direction.

When the motor shaft 21 is rotated around the central axis J1, the second shaft portion 21b, which is an eccentric shaft portion, revolves around the central axis J1 in the circumferential direction. The revolution of the second shaft portion 21b is transmitted to the external tooth gear 31 via the third bearing 52, and the position of the external tooth gear 31 inscribed between the inner peripheral surface of the hole portion 31a and the outer peripheral surface of the protruding portion 43 changes. While doing so, it swings. As a result, the position where the gear portion of the external tooth gear 31 and the gear portion of the internal tooth gear 32 mesh with each other changes in the circumferential direction. Therefore, the rotational force of the motor shaft 21 is transmitted to the internal gear 32 via the external gear 31.

Here, in the present embodiment, since the internal tooth gear 32 is fixed, it does not rotate. Therefore, the external tooth gear 31 rotates around the eccentric shaft J2 due to the reaction force of the rotational force transmitted to the internal tooth gear 32. At this time, the rotation direction of the external tooth gear 31 is opposite to the rotation direction of the motor shaft 21. The rotation of the external tooth gear 31 around the eccentric shaft J2 is transmitted to the output portion 46 via the hole portion 31a and the protruding portion 43. As a result, the output shaft 41 rotates around the central axis J1. In this way, the rotation of the motor shaft 21 is transmitted to the output shaft 41 via the reduction mechanism 30.

The rotation of the output shaft 41 is decelerated with respect to the rotation of the motor shaft 21 by the deceleration mechanism 30. Specifically, in the configuration of the reduction mechanism 30 of the present embodiment, the reduction ratio R of the rotation of the output shaft 41 with respect to the rotation of the motor shaft 21 is represented by R = − (N2-N1) / N2. The minus sign at the beginning of the equation representing the reduction ratio R indicates that the direction of rotation of the output shaft 41 to be decelerated is opposite to the direction of rotation of the motor shaft 21. N1 is the number of teeth of the external tooth gear 31, and N2 is the number of teeth of the internal tooth gear 32. As an example, when the number of teeth N1 of the external gear 31 is 59 and the number of teeth N2 of the internal gear 32 is 60, the reduction ratio R is -1/60.

As described above, according to the reduction mechanism 30 of the present embodiment, the reduction ratio R of the rotation of the output shaft 41 with respect to the rotation of the motor shaft 21 can be made relatively large. Therefore, the rotational torque of the output shaft 41 can be relatively large.

<Second Embodiment>
In FIGS. 4 to 6, the X-axis direction is a direction orthogonal to the axial direction. The direction parallel to the X-axis direction is called the orthogonal direction. Of the orthogonal directions, the side to which the X-axis arrow points is called the one side in the orthogonal direction. Of the orthogonal directions, the side opposite to the side to which the X-axis arrow points is called the other side in the orthogonal direction. The orthogonal direction is a direction defined for each magnetic sensor 263. In the present embodiment, the orthogonal direction in each magnetic sensor 263 is a direction orthogonal to both the axial direction and the radial direction passing through each magnetic sensor 263. That is, in FIGS. 4 to 6, the direction orthogonal to both the X-axis direction and the Z-axis direction is the radial direction.

As shown in FIGS. 4 and 5, in the electric actuator 210 of the present embodiment, the bus bar holder 240 holds a magnetic sensor 263 and a plurality of bus bars 150. Although not shown, in the present embodiment, the bus bar holder 240 and the plurality of bus bars 150 are resin-molded and integrated molded bodies. More specifically, the bus bar holder 240 is made by insert molding using the spacer 143 and the bus bar 150 as insert members. In the present embodiment, unlike the first embodiment, the magnetic sensor 263 and the conductive wires 264, 265, and 266 are attached to the bus bar holder 240 after the insert molding. In the present embodiment, the bus bar holder 240 has a magnetic sensor accommodating hole 240d, a first through hole 240a, a second through hole 240b, and a third through hole 240c.

The magnetic sensor accommodating hole 240d opens downward and accommodates the magnetic sensor 263. The magnetic sensor accommodating hole 240d is recessed upward from the lower surface of the bus bar holder 240. The magnetic sensor accommodating hole 240d is a hole having a bottom on the upper side. When viewed in the axial direction, the magnetic sensor accommodating hole 240d has a substantially rectangular shape. Two of the inner surfaces of the magnetic sensor accommodating hole 240d face in the radial direction. The upper part of the magnetic sensor 263 is housed inside the magnetic sensor housing hole 240d. The orthogonal dimension of the magnetic sensor accommodating hole 240d is larger than the orthogonal dimension of the magnetic sensor 263. The radial dimension of the magnetic sensor accommodating hole 240d is substantially the same as the radial dimension of the magnetic sensor 263. Although not shown, in the present embodiment, three magnetic sensor accommodating holes 240d are arranged at intervals in the circumferential direction. The inner surface of the magnetic sensor accommodating hole 240d is provided with a first inclined surface 240e, a second inclined surface 240f, a first support surface 240g, and a second support surface 240h.

As shown in FIG. 4, the first inclined surface 240e and the second inclined surface 240f are provided on the upper inner surface of the magnetic sensor accommodating hole 240d. The first inclined surface 240e and the second inclined surface 240f are surfaces facing downward and inclined with respect to a plane orthogonal to the axial direction. The first inclined surface 240e and the second inclined surface 240f are arranged at intervals in the orthogonal direction. In the present embodiment, the first inclined surface 240e and the second inclined surface 240f are arranged so as to sandwich the third through hole 240c, which will be described later, in the orthogonal direction. The first inclined surface 240e and the second inclined surface 240f are arranged symmetrically with each other in the orthogonal direction. The first inclined surface 240e is located on the other side (−X side) in the orthogonal direction of the second inclined surface 240f.

The first inclined surface 240e is located on the upper side toward the other side (−X side) in the orthogonal direction. The end of the first inclined surface 240e on the side farther from the second inclined surface 240f in the orthogonal direction is connected to the lower end of the first through hole 240a. The end of the first inclined surface 240e on the side closer to the second inclined surface 240f in the orthogonal direction is arranged on the second inclined surface 240f side (+ X side) in the orthogonal direction with respect to the first connecting portion 264a described later. .. In the present embodiment, the end portion of the first inclined surface 240e on the side closer to the second inclined surface 240f in the orthogonal direction is located between the first connecting portion 264a and the third connecting portion 266a described later in the orthogonal direction. are doing.

In the present embodiment, the end of the first inclined surface 240e on the side far from the second inclined surface 240f in the orthogonal direction is the end of the first inclined surface 240e on the other side (−X side) in the orthogonal direction. This is the uppermost portion of the first inclined surface 240e. The end of the first inclined surface 240e on the side close to the second inclined surface 240f in the orthogonal direction is the end of the first inclined surface 240e on one side (+ X side) in the orthogonal direction, and the end of the first inclined surface 240e. This is the lowest part of the house.

The second inclined surface 240f is located on the upper side toward one side (+ X side) in the orthogonal direction. That is, the first inclined surface 240e and the second inclined surface 240f are located on the upper side as they are separated from each other in the orthogonal direction. The end of the second inclined surface 240f on the side farther from the first inclined surface 240e in the orthogonal direction is connected to the lower end of the second through hole 240b. The end of the second inclined surface 240f on the side close to the first inclined surface 240e in the orthogonal direction is arranged on the first inclined surface 240e side (-X side) in the orthogonal direction from the second connecting portion 265a described later. There is. In the present embodiment, the end portion of the second inclined surface 240f on the side close to the first inclined surface 240e in the orthogonal direction is located between the second connecting portion 265a and the third connecting portion 266a described later in the orthogonal direction. are doing.

In the present embodiment, the end of the second inclined surface 240f on the side far from the first inclined surface 240e in the orthogonal direction is the end of the second inclined surface 240f on one side (+ X side) in the orthogonal direction. , Is the uppermost portion of the second inclined surface 240f. The end of the second inclined surface 240f on the side close to the first inclined surface 240e in the orthogonal direction is the end of the second inclined surface 240f on the other side (−X side) in the orthogonal direction, and the second inclined surface 240f. It is the lowermost part of the.

As shown in FIG. 5, the first support surface 240g and the second support surface 240h are each a part of the upper inner surface of the magnetic sensor accommodating hole 240d. The first support surface 240g is located at the radial inner end of the magnetic sensor accommodating hole 240d. The second support surface 240h is located at the radial outer end of the magnetic sensor accommodating hole 240d. The first support surface 240 g and the second support surface 240 h each face downward. The first support surface 240g and the second support surface 240h are in contact with the surface facing the upper side of the magnetic sensor 263, respectively.

As shown in FIG. 4, the first through hole 240a, the second through hole 240b, and the third through hole 240c are holes extending upward from the magnetic sensor accommodating hole 240d and opening to the upper side of the bus bar holder 240, respectively. .. The first through hole 240a, the second through hole 240b, and the third through hole 240c are, for example, circular holes, respectively. In the present embodiment, the first through hole 240a, the second through hole 240b, and the third through hole 240c are arranged at intervals in the orthogonal direction. In the present embodiment, the first through hole 240a and the second through hole 240b are provided so as to sandwich the third through hole 240c in the orthogonal direction.

The first through hole 240a extends upward from the end on the other side (−X side) in the orthogonal direction of the magnetic sensor accommodating hole 240d. The second through hole 240b extends upward from the end on one side (+ X side) in the orthogonal direction of the magnetic sensor accommodating hole 240d. The third through hole 240c extends upward from the central portion in the orthogonal direction of the magnetic sensor accommodating hole 240d. The lower end of the third through hole 240c is opened in a portion of the upper inner surface of the magnetic sensor accommodating hole 240d located between the first inclined surface 240e and the second inclined surface 240f in the orthogonal direction. .. The lower end of the first through hole 240a and the lower end of the second through hole 240b are located above the lower end of the third through hole 240c.

The distance between the first through hole 240a and the second through hole 240b in the orthogonal direction is larger than the distance between the first connection portion 264a and the second connection portion 265a, which will be described later. The distance between the first through hole 240a and the third through hole 240c in the orthogonal direction is larger than the distance between the first connection portion 264a and the third connection portion 266a, which will be described later. The distance between the second through hole 240b and the third through hole 240c in the orthogonal direction is larger than the distance between the second connection portion 265a and the third connection portion 266a, which will be described later. The first conductive wire 264, the second conductive wire 265, and the third conductive wire 266, which will be described later, are passed through the first through hole 240a, the second through hole 240b, and the third through hole 240c, respectively. The other configurations of the bus bar holder 240 are the same as the other configurations of the bus bar holder 140 of the first embodiment.

As shown in FIG. 4, in the electric actuator 210 of the present embodiment, the upper portion of the magnetic sensor 263 is housed inside the magnetic sensor housing hole 240d. More specifically, the magnetic sensor 263 is entirely housed inside the magnetic sensor housing hole 240d except for the lower end. As shown in FIG. 5, in the present embodiment, the surfaces facing the radial inner side and the radial outer side of the magnetic sensor 263 are fixed in contact with the inner surface of the magnetic sensor accommodating hole 240d. As described above, the surface of the magnetic sensor 263 facing upward is in contact with the first support surface 240 g and the second support surface 240 h. As a result, the position of the magnetic sensor 263 with respect to the bus bar holder 240 in the axial direction is determined. Although not shown, in this embodiment as well, three magnetic sensors 263 are arranged at intervals in the circumferential direction, as in the first embodiment. The other configurations of the magnetic sensor 263 are the same as the other configurations of the magnetic sensor 63 of the first embodiment.

As shown in FIG. 4, in the electric actuator 210 of the present embodiment, the first conductive wire 264, the second conductive wire 265, and the third conductive wire 266 are connected to each magnetic sensor 263. Has been done. In the present embodiment, the first conductive wire 264, the second conductive wire 265, and the third conductive wire 266 are terminals whose lower ends are electrically connected to the magnetic sensor 263, respectively. The first conductive wire 264, the second conductive wire 265, and the third conductive wire 266 each extend upward from the magnetic sensor 263. The first conductive wire 264, the second conductive wire 265, and the third conductive wire 266 are arranged at intervals in the orthogonal direction. In the present embodiment, the first conductive wire 264 and the second conductive wire 265 are arranged so as to sandwich the third conductive wire 266 in the orthogonal direction. The first conductive wire 264 is arranged on the other side (−X side) in the orthogonal direction with respect to the third conductive wire 266. The second conductive wire 265 is arranged on one side (+ X side) in the orthogonal direction with respect to the third conductive wire 266. The upper end of the first conductive wire 264, the upper end of the second conductive wire 265, and the upper end of the third conductive wire 266 penetrate the bus bar holder 240 from the magnetic sensor accommodating hole 240d, respectively. Then, it is electrically connected to the circuit board 270 by the solder 280.

In the present embodiment, the first conductive wire 264 is made by bending a part of the conductive wire extending linearly in the axial direction to the other side (−X side) in the orthogonal direction. In the present embodiment, when the magnetic sensor 263 is attached to the bus bar holder 240, a part of the first conductive wire 264 is bent to the other side (−X side) in the orthogonal direction. The first conductive wire 264 has a first connection portion 264a, a first inclined portion 264b, and a first terminal portion 264c. The first connection portion 264a is a portion connected to the magnetic sensor 263. The first connection portion 264a is located inside the magnetic sensor accommodating hole 240d. The first connection portion 264a extends upward from the magnetic sensor 263. The lower end of the first connection portion 264a is connected to the magnetic sensor 263 and electrically connected to the magnetic sensor 263. The upper end of the first connecting portion 264a is located between the magnetic sensor 263 and the first inclined surface 240e in the axial direction. The first connecting portion 264a is arranged so as to overlap the first inclined surface 240e when viewed in the axial direction.

The first inclined portion 264b extends from the upper end portion of the first connecting portion 264a to the upper side and the other side (−X side) in the diagonally orthogonal direction. The first inclined portion 264b is located on the upper side toward the other side in the orthogonal direction. The other end of the first inclined portion 264b in the orthogonal direction is located below the first through hole 240a.

The first terminal portion 264c extends upward from the end portion on the other side (−X side) in the orthogonal direction of the first inclined portion 264b. The first terminal portion 264c is located on the other side in the orthogonal direction with respect to the first connection portion 264a. The first terminal portion 264c is axially passed through the first through hole 240a. The first terminal portion 264c projects upward from the bus bar holder 240 via the first through hole 240a. The upper end of the first terminal portion 264c projects to the upper side of the circuit board 270 via the first opening 270a provided in the circuit board 270. The portion of the first terminal portion 264c that is passed through the first opening 270a of the circuit board 270 is electrically connected to the circuit board 270 by the solder 280.

In the present embodiment, the second conductive wire 265 is made by bending a part of the conductive wire extending linearly in the axial direction to one side (+ X side) in the orthogonal direction. In the present embodiment, when the magnetic sensor 263 is attached to the bus bar holder 240, a part of the second conductive wire 265 is bent to one side (+ X side) in the orthogonal direction. The second conductive wire 265 has a second connecting portion 265a, a second inclined portion 265b, and a second terminal portion 265c. The second connection portion 265a is a portion connected to the magnetic sensor 263. The second connection portion 265a is located inside the magnetic sensor accommodating hole 240d. The second connection portion 265a extends upward from the magnetic sensor 263. The lower end of the second connection portion 265a is connected to the magnetic sensor 263 and electrically connected to the magnetic sensor 263. The upper end of the second connecting portion 265a is located between the magnetic sensor 263 and the second inclined surface 240f in the axial direction. The second connecting portion 265a is arranged so as to overlap the second inclined surface 240f when viewed in the axial direction.

The second inclined portion 265b extends from the upper end portion of the second connecting portion 265a to the upper side and one side (+ X side) in the diagonally orthogonal direction. The second inclined portion 265b is located on the upper side toward one side in the orthogonal direction. One end of the second inclined portion 265b in the orthogonal direction is located below the second through hole 240b.

The second terminal portion 265c extends upward from the end portion on one side (+ X side) in the orthogonal direction of the second inclined portion 265b. The second terminal portion 265c is located on one side in the orthogonal direction with respect to the second connection portion 265a. The second terminal portion 265c is axially passed through the second through hole 240b. The second terminal portion 265c projects upward from the bus bar holder 240 via the second through hole 240b. The upper end of the second terminal portion 265c projects to the upper side of the circuit board 270 via the second opening 270b provided in the circuit board 270. The portion of the second terminal portion 265c that is passed through the second opening 270b of the circuit board 270 is electrically connected to the circuit board 270 by the solder 280.

Unlike the first conductive wire 264 and the second conductive wire 265, the third conductive wire 266 extends linearly in the axial direction. The third conductive wire 266 has a third connection portion 266a and a third terminal portion 266c. The third connection portion 266a is a portion connected to the magnetic sensor 263. The third connection portion 266a is located inside the magnetic sensor accommodating hole 240d. The third connection portion 266a extends upward from the magnetic sensor 263. The lower end of the third connection portion 266a is connected to the magnetic sensor 263 and electrically connected to the magnetic sensor 263. The upper end of the third connecting portion 266a is located below the third through hole 240c.

The third terminal portion 266c extends upward from the upper end portion of the third connection portion 266a. The third connection portion 266a and the third terminal portion 266c are connected straight in the axial direction. The third terminal portion 266c is axially passed through the third through hole 240c. The third terminal portion 266c projects upward from the bus bar holder 240 via the third through hole 240c. The upper end of the third terminal portion 266c projects to the upper side of the circuit board 270 via the third opening 270c provided in the circuit board 270. The portion of the third terminal portion 266c that is passed through the third opening 270c of the circuit board 270 is electrically connected to the circuit board 270 by the solder 280.

In the circuit board 270 of the present embodiment, the first opening 270a, the second opening 270b, and the third opening 270c described above are arranged at intervals in the orthogonal direction. In the present embodiment, the inner diameter of the first opening 270a, the inner diameter of the second opening 270b, and the inner diameter of the third opening 270c are the inner diameter of the first through hole 240a, the inner diameter of the second through hole 240b, and the third penetration, respectively. It is larger than the inner diameter of the hole 240c. The first opening 270a overlaps with the first through hole 240a when viewed in the axial direction. The second opening 270b overlaps with the second through hole 240b when viewed in the axial direction. The third opening 270c overlaps with the third through hole 240c when viewed in the axial direction. As described above, the first conductive wire 264, the second conductive wire 265, and the third conductive wire 266 are passed through the first opening 270a, the second opening 270b, and the third opening 270c, respectively.

Next, the procedure for attaching the magnetic sensor 263 to the bus bar holder 240 in this embodiment will be described. As shown in FIG. 6, before attaching the magnetic sensor 263 to the bus bar holder 240, the first conductive wire 264, the second conductive wire 265, and the third conductive wire 266 are each linearly upward from the magnetic sensor 263. Extends to. When the first conductive wire 264, the second conductive wire 265, and the third conductive wire 266 extending linearly from the lower side of the bus bar holder 240 are inserted into the magnetic sensor accommodating hole 240d, the upper end of the first conductive wire 264 is inserted. The portion is in contact with the first inclined surface 240e, and the upper end portion of the second conductive wire 265 is in contact with the second inclined surface 240f. At this time, the upper end of the first conductive wire 264 is guided to the first through hole 240a along the first inclined surface 240e and inserted into the first through hole 240a. The upper end of the second conductive wire 265 is guided to the second through hole 240b along the second inclined surface 240f and inserted into the second through hole 240b. At this time, a part of the first conductive wire 264 and a part of the second conductive wire 265 extending linearly in the axial direction are deformed in a direction away from each other in the orthogonal direction. The upper end of the third conductive wire 266 is inserted into the third through hole 240c without being deformed in the orthogonal direction, unlike the first conductive wire 264 and the second conductive wire 265. Further, when the first conductive wire 264, the second conductive wire 265, and the third conductive wire 266 are inserted into the magnetic sensor accommodating hole 240d, the first conductive wire 264, the second conductive wire 265, and the third conductive wire 266 become , Each of the first through hole 240a, the second through hole 240b, and the third through hole 240c project to the upper side of the bus bar holder 240. Also at this time, a part of the first conductive wire 264 and a part of the second conductive wire 265 are bent and deformed in the orthogonal direction by the first inclined surface 240e or the second inclined surface 240f. When the magnetic sensor 263 is inserted into the magnetic sensor accommodating hole 240d, the surface facing upward of the magnetic sensor 263 comes into contact with the first support surface 240g and the second support surface 240h, and the magnetic sensor 263 refers to the bus bar holder 240. Positioned in the axial direction. When the magnetic sensor 263 is inserted into the magnetic sensor accommodating hole 240d until the magnetic sensor 263 is positioned axially with respect to the bus bar holder 240, the first conductive wire 264 and the second conductive wire 265 have the shape shown in FIG. ..

Therefore, in the present embodiment, the first conductive wire 264, the second conductive wire 265, the third conductive wire 266, and the magnetic sensor 263 are inserted straight from the magnetic sensor 263 by the step of inserting the magnetic sensor accommodation hole 240d. The first conductive wire 264 and the second conductive wire 265 extending linearly on the upper side are guided to the first through hole 240a and the second through hole 240b by the first inclined surface 240e and the second inclined surface 240f, respectively. However, it can be easily passed through the first through hole 240a and the second through hole 240b.

According to the present embodiment, the bus bar holder 240 has a magnetic sensor accommodating hole 240d for accommodating the magnetic sensor 263, and a first through hole 240a and a second through hole 240b extending upward from the magnetic sensor accommodating hole 240d and opening upward. And has a first inclined surface 240e and a second inclined surface 240f provided on the upper inner surface of the magnetic sensor accommodating hole 240d. The end of the first inclined surface 240e on the side farther from the second inclined surface 240f in the orthogonal direction is connected to the lower end of the first through hole 240a, and the second inclined surface of the first inclined surface 240e in the orthogonal direction. The end portion on the side closer to the surface 240f is arranged on the second inclined surface 240f side in the orthogonal direction with respect to the first connecting portion 264a. Further, the end portion of the second inclined surface 240f on the side far from the first inclined surface 240e in the orthogonal direction is connected to the lower end portion of the second through hole 240b, and the second inclined surface 240f of the second inclined surface 240f in the orthogonal direction. The end portion on the side closer to the 1 inclined surface 240e is arranged on the 1st inclined surface 240e side in the orthogonal direction with respect to the second connecting portion 265a. Therefore, the first conductive wire 264 is inserted into the first through hole 240a along the first inclined surface 240e, and the second conductive wire 265 is inserted into the second through hole 240b along the second inclined surface 240f. The distance between the first terminal portion 264c and the second terminal portion 265c in the orthogonal direction can be made larger than the distance between the first connection portion 264a and the second connection portion 265a in the orthogonal direction. As a result, the distance between the plurality of conductive lines in the orthogonal direction can be increased in the portion connected to the circuit board 270. In the present embodiment, the distance between the first terminal portion 264c and the third terminal portion 266c in the orthogonal direction and the distance between the second terminal portion 265c and the third terminal portion 266c in the orthogonal direction can be increased. Therefore, the distance between the positions where the circuit board 270 and each conductive wire are connected by soldering can be widened. Therefore, the step of connecting the circuit board 270 and each conductive wire by soldering can be easily performed. As a result, when the soldering work is performed by the soldering apparatus, the circuit board 270 and each conductive wire can be easily soldered even when the working accuracy of the soldering apparatus is relatively low. .. Therefore, in the soldering process, it is not necessary to use a soldering device having high work accuracy. Therefore, the circuit board 270 and each conductive wire can be electrically connected by using a relatively inexpensive general-purpose soldering device. Therefore, the manufacturing cost of the electric actuator 210 can be reduced.

According to the present embodiment, the end portion of the first inclined surface 240e on the side closer to the second inclined surface 240f in the orthogonal direction is arranged on the second inclined surface 240f side in the orthogonal direction with respect to the first connecting portion 264a. There is. The end of the second inclined surface 240f on the side close to the first inclined surface 240e in the orthogonal direction is arranged on the side of the first inclined surface 240e in the orthogonal direction with respect to the second connecting portion 265a. Therefore, in the step of inserting each conductive wire and the magnetic sensor 263 into the magnetic sensor accommodating hole 240d, the upper end of the first conductive wire 264 extending straight upward from the magnetic sensor 263 is the first inclined surface 240e. In addition, the upper end of the second conductive wire 265 extending straight upward from the magnetic sensor 263 can easily come into contact with the second inclined surface 240f. At this time, the upper end of the first conductive wire 264 is guided to the first through hole 240a along the first inclined surface 240e and inserted into the first through hole 240a. The upper end of the second conductive wire 265 is guided to the second through hole 240b along the second inclined surface 240f and inserted into the second through hole 240b. Therefore, even when the first conductive wire 264 and the second conductive wire 265 are provided so as to extend straight upward from the magnetic sensor 263 in a straight line, a part of the first conductive wire 264 and one of the second conductive wires 265. The portions can be easily deformed so as to be separated from each other in the orthogonal direction. That is, by attaching the magnetic sensor 263 to the bus bar holder 240, it is possible to widen the distance between the terminal portions connected to the circuit board 270 in each conductive wire in the orthogonal direction. Therefore, in order to pass the first conductive wire 264 and the second conductive wire 265 through the first through hole 240a and the second through hole 240b, it is necessary to use the first conductive wire 264 and the second conductive wire 265 that have been bent in advance. Will disappear. Therefore, the manufacturing cost and man-hours for manufacturing the conductive wire can be reduced. Further, in the present embodiment, a separate step for passing the first conductive wire 264 and the second conductive wire 265 through the first through hole 240a and the second through hole 240b, respectively, is not required. Therefore, the workability of the work of assembling each conductive wire and the magnetic sensor 263 to the bus bar holder 240 can be improved. Therefore, the man-hours for manufacturing the electric actuator 210 can be reduced.

In this embodiment, the number of conductive wires connected to the magnetic sensor 263 is not limited to three. For example, the third conductive wire 266 may not be provided, and four or more conductive wires may be provided. Further, the number of through holes and the number of inclined surfaces provided in the bus bar holder 240 are not limited to three, respectively, and the number of conductive wires connected to the magnetic sensor 263 and the openings provided in each connection portion and the substrate. An appropriate number of through holes and inclined surfaces can be provided depending on the position and the like.

The electric actuator to which the present invention is applied may be any device as long as it can move the target object by being supplied with electric power, and may be a motor without a deceleration mechanism. Further, the electric actuator may be an electric pump including a pump unit driven by a motor unit. The use of the electric actuator is not particularly limited. The electric actuator may be mounted on a shift-by-wire actuator device driven based on the shift operation of the driver. Further, the electric actuator may be mounted on a device other than the vehicle. It should be noted that the configurations described in the present specification can be appropriately combined within a range that does not contradict each other.

10, 210 ... Electric actuator, 11 ... Case, 12 ... Support surface, 15 ... Support member (partition member), 20 ... Motor part, 21 ... Motor shaft, 21a ... First shaft part, 21b ... Second shaft part (eccentricity) Shaft), 22 ... rotor, 23 ... stator, 24b ... outer peripheral surface, 25 ... through hole, 26 ... recess, 30 ... deceleration mechanism, 40 ... magnet, 41 ... output shaft, 42 ... connecting part, 44 ... cylinder part , 45 ... connecting recess, 51 ... second bearing, 52 ... third bearing, 53 ... first bearing, 63,263 ... magnetic sensor, 64 ... conductive wire, 70,270 ... circuit board, 140, 240 ... bus bar holder, 141 ... peripheral wall, 142 ... protrusion, 143 ... spacer, 150 ... bus bar, 240a ... first through hole, 240b ... second through hole, 240e ... first inclined surface, 240f ... second inclined surface, 240d ... magnetic sensor Accommodation hole, 264 ... 1st conductive wire, 264a ... 1st connection, 264c ... 1st terminal, 265 ... 2nd conductive wire, 265a ... 2nd connection, 265c ... 2nd terminal, J1 ... Central axis, J2 ... Eccentric axis

Claims (7)

A rotor that can rotate around a central axis that extends in the axial direction, a motor unit that has a stator that is radially opposed to the rotor through a gap, and a motor unit.
The magnet fixed to the rotor and
A bus bar electrically connected to the motor unit and
A bus bar holder arranged on one side in the axial direction of the rotor and holding the bus bar,
A magnetic sensor fixed to the bus bar holder and capable of detecting the magnetic field of the magnet,
A conductive wire electrically connected to the magnetic sensor and
A circuit board arranged on one side in the axial direction of the bus bar holder and electrically connected to the motor unit.
Equipped with
The magnetic sensor is arranged so as to face each other with a gap on one side in the axial direction of the magnet.
An electric actuator in which the conductive wire penetrates the bus bar holder from the inside of the bus bar holder and is electrically connected to the circuit board. The electric actuator according to claim 1, wherein the magnetic sensor and the bus bar holder are molded bodies that are resin-molded and integrated. A plurality of the conductive wires are provided.
The plurality of conductive wires include a first conductive wire and a second conductive wire extending in one axial direction from the magnetic sensor.
The first conductive wire and the second conductive wire are arranged at intervals in an orthogonal direction orthogonal to the axial direction.
The bus bar holder is
A magnetic sensor accommodating hole that opens on the other side in the axial direction and accommodates the magnetic sensor,
A first through hole and a second through hole extending from the magnetic sensor accommodating hole on one side in the axial direction and opening on one side in the axial direction.
It has a first inclined surface and a second inclined surface provided on the inner surface on one side in the axial direction of the magnetic sensor accommodating hole.
The first through hole and the second through hole are arranged at intervals in the orthogonal direction.
The first inclined surface and the second inclined surface are arranged at intervals in the orthogonal direction, and are located on one side in the axial direction as they are separated from each other in the orthogonal direction.
The end of the first inclined surface on the side far from the second inclined surface in the orthogonal direction is connected to the end on the other side in the axial direction of the first through hole.
The end of the second inclined surface on the side far from the first inclined surface in the orthogonal direction is connected to the end on the other side in the axial direction of the second through hole.
The first conductive wire is
The first terminal portion passed through the first through hole and
A first connection portion that is connected to the magnetic sensor and overlaps with the first inclined surface when viewed in the axial direction.
Have,
The second conductive wire is
The second terminal portion passed through the second through hole and
A second connection portion that is connected to the magnetic sensor and overlaps with the second inclined surface when viewed in the axial direction.
Have,
The end portion of the first inclined surface on the side closer to the second inclined surface in the orthogonal direction is arranged on the second inclined surface side in the orthogonal direction from the first connecting portion.
Claim 1 is that the end portion of the second inclined surface on the side closer to the first inclined surface in the orthogonal direction is arranged on the first inclined surface side in the orthogonal direction than the second connecting portion. The electric actuator described in. On the outer peripheral surface of the stator, a plurality of grooves are provided in the radial direction and extending in the axial direction at intervals in the circumferential direction.
The bus bar holder has a peripheral wall portion extending radially outward from the outer peripheral surface of the stator toward the other side in the axial direction and facing the groove portion.
The peripheral wall portion has a protrusion portion that protrudes inward in the radial direction and is inserted into the groove portion.
The electric actuator according to any one of claims 1 to 3. It has a support surface facing one side in the axial direction, and is provided with a case for accommodating the motor portion.
The busbar holder has a spacer that projects to one side in the axial direction.
The other side of the circuit board in the axial direction is in contact with the spacer.
The electric actuator according to claim 4, wherein the bus bar holder and the circuit board are screwed to the support surface from one side in the axial direction at a position where they overlap with the spacer when viewed in the axial direction. The case has a support member supported from the other side in the axial direction.
The support member is in contact with the other side in the axial direction of the stator, and is in contact with the other side in the axial direction.
The electric actuator according to claim 5, wherein the end of the peripheral wall portion on the other side in the axial direction is in contact with one side in the axial direction of the stator when the bus bar holder is screwed to the support surface. The electric actuator according to any one of claims 1 to 6, wherein the magnetic sensor is a Hall element.

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