Motor device

Abstract

To provide a motor device in which upsizing in an axis direction of the device can be suppressed even when a large-sized sensor substrate that cannot be housed in a recessed housing space is disposed.SOLUTION: A motor device 21 includes a motor 21b including a rotor 211, a stator 212, a plurality of lead-out portion 214, a lead-out portion 215 and a lead-out portion 216, and a sensor magnet 218. The motor device 21 includes a rotation angle sensor 21d for obtaining the rotation angle of the rotor 211, and a sensor substrate 21c on which the rotation angle sensor 21d is mounted. The sensor substrate 21c is disposed between the plurality of lead-out portion 214, lead-out portion 215, and lead-out portion 216 in an R direction of the rotation center axis C of the rotor 211, and is disposed outside a recessed housing space Sp in which the sensor magnet 218 is housed.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a motor device. [Background technology]

[0002] 2. Description of the Related Art A motor device is known in the art (see, for example, Patent Document 1).

[0003] The above-mentioned Patent Document 1 discloses a motor device including a motor body (motor). The motor device includes the above-mentioned motor body, a Hall element, a sensor board, a sensor magnet, and an end frame. The motor body includes a rotor and a stator having a stator core and a stator coil. The stator coil is wound around the stator core. The stator coil has terminal wires (ends of the stator coil) that are drawn out from the stator core and routed in the circumferential direction for connection to a control unit.

[0004] The Hall element in the above-mentioned Patent Document 1 is a sensor that outputs a signal to a control unit to obtain the rotation angle of the rotor. The Hall element is attached to a sensor board. The sensor board has an axial direction as a thickness direction. The sensor magnet is configured to apply a magnetic field to the Hall element. The end frame covers the stator core and the rotor. The end frame includes a recess having an accommodation space for accommodating the sensor board on which the Hall element is attached and the sensor magnet inside. The recess is disposed inside the terminal wires that are routed in the circumferential direction. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2020-31466 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the motor device of Patent Document 1, if the dimensions of the sensor board are increased with the change to a larger sensor with higher resolution, the sensor board with the sensor attached cannot be accommodated in the accommodation space in the recess of the end frame. In this case, if the sensor board with the sensor attached is arranged outside the accommodation space, the sensor board is arranged on the terminal wires that are routed in the circumferential direction, so the motor device becomes larger in the axial direction. Therefore, in the motor device of Patent Document 1, if a large sensor board that cannot be accommodated in the accommodation space is provided, the motor device becomes larger in the axial direction.

[0007] The present invention has been made to solve the above-mentioned problems, and one object of the present invention is to provide a motor device that can suppress an increase in axial size of the device even when a large sensor substrate that cannot be accommodated in the concave accommodation space is provided. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, a motor device in one aspect of the present invention includes a motor including a rotor, a stator including a stator core and a stator coil arranged on the stator core, a plurality of pull-out portions including ends of the stator coil pulled out to the outside of the stator core, and a sensor magnet that rotates integrally with the rotor while being accommodated in a concave accommodation space radially inward of the rotor's central axis of rotation of the plurality of pull-out portions, a rotation angle sensor arranged on the opposite side of the sensor magnet from the stator core side for acquiring the rotation angle of the rotor, and a sensor board on which the rotation angle sensor is attached, the sensor board being arranged circumferentially between the plurality of pull-out portions about the rotor's central axis of rotation, and being arranged outside the concave accommodation space in which the sensor magnet is accommodated.

[0009] In the motor device according to one aspect of the present invention, as described above, the sensor board is disposed between the plurality of drawers in the circumferential direction of the central axis of rotation of the rotor, and is disposed outside the concave housing space in which the sensor magnet is housed. As a result, even if the size of the sensor board is increased due to a change to a large rotation angle sensor with high resolution, the sensor board is disposed outside the concave housing space between the plurality of drawers in the circumferential direction of the central axis of rotation of the rotor, so that the sensor board is not disposed on the plurality of drawers. That is, the sensor board and each of the plurality of drawers are disposed at positions offset from each other in the circumferential direction, so that the sensor board and each of the plurality of drawers do not overlap each other when viewed from one side in the axial direction. Therefore, compared to the case where the sensor board is disposed on the plurality of drawers, it is possible to suppress the motor device from becoming larger in the axial direction. As a result, even if a large sensor board that cannot be accommodated in the concave housing space is provided, it is possible to suppress the motor device from becoming larger in the axial direction.

[0010] In the motor device according to the above aspect, the multiple draw-out portions preferably include a first draw-out portion, a second draw-out portion and a third draw-out portion through which AC currents of U phase, V phase and W phase respectively flow, and each of the first draw-out portion, the second draw-out portion and the third draw-out portion has a conductor portion to which an end of the stator coil is connected, and is arranged at equal angular intervals when viewed from one axial side of the central axis of rotation, with a sensor board being disposed between the circumferential conductor portions.

[0011] With this configuration, the conductor portions are arranged at equal angular intervals in the circumferential direction, so that the sensor board can be placed anywhere between the conductor portions, thereby improving the freedom of positioning the sensor board.

[0012] In the motor device according to the above aspect, the rotation angle sensor is preferably a sensor that detects the magnetization direction in a plane perpendicular to the axial direction of the central axis of rotation, changed by a magnetic field applied from the sensor magnet, and the rotation angle sensor is arranged at a position that is at least partially offset from the sensor magnet when viewed from one side in the axial direction.

[0013] With this configuration, the rotation angle sensor is at least partially offset from the sensor magnet, so that the magnetic field applied to the rotation angle sensor can be inclined with respect to the axial direction. In this case, a magnetic field component perpendicular to the radial direction in a plane perpendicular to the axial direction and a magnetic field component parallel to the radial direction in a plane perpendicular to the axial direction can be reliably generated. As a result, the magnetization direction in the plane perpendicular to the axial direction, which is a combination of both the magnetic field components, can be reliably detected, so that the rotation angle of the rotor can be reliably obtained based on the magnetization direction.

[0014] The motor device according to the aforementioned aspect preferably further includes a connection line for supplying power to the motor, the sensor board being arranged on the stator core side of the connection line in the axial direction of the central axis of rotation.

[0015] With this configuration, the sensor board can be arranged axially closer to the stator core than the connection wires, thereby further preventing the motor device from becoming large in size in the axial direction.

[0016] In the motor device according to the above aspect, the following configuration is also possible.

[0017] (Additional note 1) In the motor device according to the aforementioned aspect, the motor device is a driving force generating section of a brake actuator that transmits a braking force for stopping a vehicle via brake fluid.

[0018] With this configuration, even if a large sensor board is provided that cannot be accommodated in the concave storage space due to the use of a large, high-resolution rotational angle sensor in order to more precisely control the braking force, it is possible to prevent the motor device, which is the driving force generating unit, from increasing in size in the axial direction, thereby suppressing the axial increase in size of the brake actuator.

[0019] (Additional note 2) In a motor device equipped with a rotation angle sensor that detects changes in the magnetization direction in a plane perpendicular to the axial direction of the rotor, the rotation angle sensor is a magnetoresistive element that detects changes in the magnetization direction in a plane perpendicular to the axial direction of the rotor.

[0020] With this configuration, the resolution for detecting the rotation angle of the rotor can be increased compared to Hall elements, which detect changes in the magnetization direction along the axial direction of the rotor, thereby enabling precise control of the rotation angle of the rotor.

[0021] (Additional note 3) In the motor device according to the above aspect, the motor has a recess with a concave storage space on the inside, and further includes an end frame arranged axially outside the central axis of rotation of the stator coil, and the sensor board is arranged outside the recess of the end frame.

[0022] By configuring in this manner, the axial dimension of the concave storage space within the recess can be reduced by the amount that the sensor board is not placed, thereby preventing the axial increase in size of the motor device that would result from placing the sensor board outside the recess of the end frame.

[0023] (Additional note 4) In the motor device including the above-described connection line, the connection line is routed around so as not to overlap with the rotation angle sensor attached to the sensor board when viewed from one axial side of the central axis of rotation.

[0024] With this configuration, the connecting wire can be disposed at a position relatively far away from the vicinity of the rotation angle sensor, thereby reducing errors in the rotation angle sensor caused by a magnetic field generated by a current flowing through the connecting wire.

[0025] (Additional note 5) In the motor device according to the above aspect, the sensor board is arranged circumferentially between the multiple lead-out portions, and is arranged outside the concave accommodating space on the stator core side relative to the tip position of the end of the stator coil.

[0026] With this configuration, the sensor board can be disposed axially relatively close to the stator core, which further prevents the motor device from becoming large in size in the axial direction. [Brief description of the drawings]

[0027] [Figure 1] FIG. 1 is a schematic diagram of a brake system according to an embodiment. [Diagram 2] FIG. 1 is a block diagram of a brake actuator according to an embodiment. [Diagram 3] 1 is a perspective view of a motor device according to an embodiment; [Figure 4] 1 is a development view showing a state in which a stator coil is wound around a stator core in a motor of a motor device according to an embodiment of the present invention; [Diagram 5] 2 is a schematic diagram showing a state of connections of a stator coil of a motor device according to one embodiment of the present invention; FIG. [Figure 6] FIG. 2 is a perspective view showing a motor and a sensor board of the motor device according to the embodiment; [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. [Figure 8] FIG. 1 is a plan view showing a motor device according to an embodiment. [Figure 9] FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. [Figure 10] FIG. 2 is a plan view showing a rotation angle sensor and a sensor magnet of the motor device according to the embodiment; [Figure 11] FIG. 2 is a plan view showing connection lines of the motor device according to the embodiment; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

[0029] The configuration of a motor device 21 of this embodiment that is applied to a brake system 100 will be described with reference to FIGS.

[0030] As shown in FIG. 1, a brake system 100 is a system that is applied to vehicles including electric vehicles having a drive motor and hybrid vehicles having a drive motor and an engine.

[0031] The brake system 100 amplifies the braking force generated by the driver's brake operation to brake each of the left front wheel Flb, the right front wheel Frb, the left rear wheel Rlb, and the right rear wheel Rfb. That is, the brake system 100 transmits the amplified braking force to the brake pads Flb1 (the brake pads Frb1, Rlb1, and Rrb1), and causes the brake pads Flb1 (the brake pads Frb1, Rlb1, and Rrb1) to clamp the brake rotors Flb2 (the brake rotors Frb2, Rlb2, and Rrb2) with the transmitted braking force.

[0032] The brake system 100 includes a brake pedal 1, a brake actuator 2, a master cylinder 3, and a control unit 4. The brake pedal 1 is an operating member that is depressed by the driver when braking the vehicle. The brake actuator 2 has a function of multiplying the driver's depressing force to increase the brake fluid pressure of the brake fluid. The master cylinder 3 is configured to supply brake fluid with an appropriate brake fluid pressure to each of the left front wheel Flb, the right front wheel Frb, the left rear wheel Rlb, and the right rear wheel Rfb. The control unit 4 includes a CPU (Central Processing Unit) and a storage unit such as a memory. The control unit 4 is configured to control the brake system 100 based on a control program stored in the storage unit. The brake actuator 2 and the control unit 4 are electrically connected to each other.

[0033] In this manner, in the brake system 100, the control unit 4 controls the brake actuator 2 based on information regarding the brake pedal 1, and braking force is transmitted to each of the brake pads Flb1, Frb1, Rlb1 and Rrb1 via the master cylinder 3.

[0034] The brake actuator 2 is configured to adjust the brake fluid to an appropriate brake fluid pressure and fluid amount based on a control signal from the control unit 4 in order to generate a braking force that stops the vehicle.

[0035] 2, the brake actuator 2 includes a motor device 21, a speed reduction mechanism 22, a linear movement mechanism 23, and a piston 24. It is noted that the brake actuator 2 does not necessarily need to include the speed reduction mechanism 22.

[0036] The motor device 21 is a driving force generating unit for generating a driving force in the brake actuator 2. The motor device 21 and the reduction mechanism 22 are connected. The reduction mechanism 22 is configured to reduce the speed of the torque transmitted from the motor device 21. The reduction mechanism 22 and the linear movement mechanism 23 are connected. The linear movement mechanism 23 is configured to convert the torque transmitted from the reduction mechanism 22 into a driving force in a linear direction. The linear movement mechanism 23 and the piston 24 are connected. The piston 24 is configured to increase the brake fluid pressure by moving forward by the linear movement mechanism 23 and to increase the amount of brake fluid supplied. The piston 24 is configured to reduce the brake fluid pressure by moving backward by the linear movement mechanism 23 and to decrease the amount of brake fluid supplied.

[0037] Here, in motor device 21, the amount of forward and backward movement of piston 24 is controlled by three-phase AC power sent from an inverter controlled based on a control signal from control unit 4. The configuration of motor device 21 will be described in detail below.

[0038] (Motor device) As shown in FIG. 3, the motor device 21 has a resin holder 21a, a motor 21b, a sensor board 21c (see FIG. 6), a rotation angle sensor 21d (see FIG. 7), and a connection wire 21e (see FIG. 8).

[0039] Resin holder 21a is a ring-shaped resin member that covers an end of motor 21b. Resin holder 21a has cutouts 211a into which first drawer portion 214, second drawer portion 215, and third drawer portion 216 are inserted. Cutouts 211a are formed on the edge of resin holder 21a in the D1 direction, corresponding to the positions of first drawer portion 214, second drawer portion 215, and third drawer portion 216. Each of first drawer portion 214, second drawer portion 215, and third drawer portion 216 is an example of the "plurality of drawer portions" in the claims.

[0040] The motor 21b is configured by a brushless motor controlled based on three-phase AC power sent from an inverter. Specifically, the motor 21b has a rotor 211, a stator 212, an end frame 213 (see FIG. 6), a first lead portion 214, a second lead portion 215, a third lead portion 216, a sensor yoke 217 (see FIG. 6), and a sensor magnet 218 (see FIG. 6).

[0041] Here, the direction in which the rotation axis C of the rotor 211 extends is the Z direction, one of the Z directions is the Z1 direction, and the opposite direction to the Z1 direction is the Z2 direction. The radial direction of the rotation axis C is the D direction, the outer side of the D direction is the D1 direction, and the inner side of the D direction is the D2 direction. The circumferential direction of the rotation axis C is the R direction, one of the R directions is the R1 direction, and the other of the R directions is the R2 direction.

[0042] The rotor 211 is configured to rotate in each of the R1 direction and the R2 direction about the central axis of rotation C. The rotor 211 has a rotor shaft 2111 (see FIG. 7) and a rotor core (not shown).

[0043] 4, the stator 212 is configured to generate a magnetic field by a three-phase AC current supplied from an inverter (not shown). The stator 212 is disposed so that the rotor 211 faces the direction D2. The stator 212 has a stator core 212a and a stator coil 212b.

[0044] The stator core 212a is configured by laminating a plurality of electromagnetic steel plates in the Z direction, and is configured to be permeable to magnetic flux. The stator coil 212b is disposed in the stator core 212a. That is, the stator coil 212b is wound around each of the plurality of teeth of the stator core 212a. A plurality of the stator coils 212b are provided corresponding to each of the U-phase, V-phase, and W-phase. Each of the plurality of stator coils 212b is connected by a Δ connection (see FIG. 5). The stator coil 212b has coil ends 2121b, which are the winding start and winding end portions. The coil ends 2121b are also the ends of the stator coil 212b drawn out to the outside of the stator core 212a.

[0045] End Frame 6, the end frame 213 is disposed on the Z1 direction side of the stator coil 212b in order to block magnetic flux from the stator coil 212b. The end frame 213 is made of a ferromagnetic material such as iron.

[0046] End frame 213 has a notch 213a and a recess 213b. A plurality (three) of notches 213a are formed on the edge of end frame 213 in the D1 direction, corresponding to the positions of first drawer portion 214, second drawer portion 215, and third drawer portion 216. First drawer portion 214, second drawer portion 215, and third drawer portion 216 are inserted into notches 213a.

[0047] As shown in FIG. 7, the recess 213b is formed by recessing the center portion of the end frame 213 in the D direction toward the Z2 direction (the stator core 212a side). The recess 213b has a first plate-shaped portion 2131b, a second plate-shaped portion 2132b, and a third plate-shaped portion 2133b. The first plate-shaped portion 2131b, the second plate-shaped portion 2132b, and the third plate-shaped portion 2133b are integrally provided. The first plate-shaped portion 2131b extends from the end portion of the second plate-shaped portion 2132b in the Z1 direction toward the D1 direction. The second plate-shaped portion 2132b extends from the end portion of the first plate-shaped portion 2131b in the D2 direction toward the Z2 direction. The third plate-shaped portion 2133b extends from the end portion of the second plate-shaped portion 2132b in the Z2 direction toward the D2 direction.

[0048] A concave storage space Sp is formed on the D2 direction side of the recess 213b. The concave storage space Sp is a space formed by being recessed in the Z2 direction. The concave storage space Sp is a space formed by the second plate-shaped portion 2132b and the third plate-shaped portion 2133b. That is, the concave storage space Sp is a space on the D2 direction side of the second plate-shaped portion 2132b, which is on the Z2 direction side of the end of the first plate-shaped portion 2131b on the Z1 direction side and on the Z1 direction side of the end of the third plate-shaped portion 2133b on the Z1 direction side. The sensor yoke 217 and the sensor magnet 218 are accommodated in such a concave storage space Sp. The concave storage space Sp is disposed on the D2 direction side of the first drawer portion 214, the second drawer portion 215, and the third drawer portion 216.

[0049] <First drawer section, second drawer section and third drawer section> As shown in FIG. 8, first lead portion 214, second lead portion 215, and third lead portion 216 are configured so that U-phase, V-phase, and W-phase AC currents flow therethrough, respectively.

[0050] First lead-out portion 214 has multiple (four) coil ends 2121b and bus bar 214a. Second lead-out portion 215 has multiple (four) coil ends 2121b and bus bar 215a. Third lead-out portion 216 has multiple (four) coil ends 2121b and bus bar 216a. Each of bus bar 214a, bus bar 215a, and bus bar 216a is an example of a "conductor portion" in the claims.

[0051] Each of the multiple coil ends 2121b extends in the Z1 direction.

[0052] Of the multiple (four) coil ends 2121b in the first lead-out portion 214, each of a pair of coil ends 2121b on the R1 direction side is the winding start and winding end of the stator coil 212b through which a V-phase AC current flows. Of the multiple (four) coil ends 2121b in the first lead-out portion 214, each of a pair of coil ends 2121b on the R2 direction side is the winding start and winding end of the stator coil 212b through which a W-phase AC current flows.

[0053] Bus bar 214a has a terminal portion extending in the R direction that electrically connects a pair of coil ends 2121b on the R1 direction side and a pair of coil ends 2121b on the R2 direction side. Bus bar 214a has a terminal portion protruding in the Z1 direction from a central portion in the R direction. Connection wire 21e is electrically connected to the terminal portion protruding in the Z1 direction.

[0054] Of the multiple (four) coil ends 2121b in the second lead-out portion 215, each of a pair of coil ends 2121b on the R1 direction side is the winding start and winding end of the stator coil 212b through which a W-phase AC current flows. Of the multiple (four) coil ends 2121b in the second lead-out portion 215, each of a pair of coil ends 2121b on the R2 direction side is the winding start and winding end of the stator coil 212b through which a U-phase AC current flows.

[0055] Bus bar 215a has a terminal portion extending in the R direction that electrically connects a pair of coil ends 2121b on the R1 direction side and a pair of coil ends 2121b on the R2 direction side. Bus bar 215a has a terminal portion protruding in the Z1 direction from a central portion in the R direction. Connection wire 21e is electrically connected to the terminal portion protruding in the Z1 direction.

[0056] Of the multiple (four) coil ends 2121b in the third lead-out portion 216, each of a pair of coil ends 2121b on the R1 direction side is the winding start and winding end of the stator coil 212b through which a U-phase AC current flows. Of the multiple (four) coil ends 2121b in the third lead-out portion 216, each of a pair of coil ends 2121b on the R2 direction side is the winding start and winding end of the stator coil 212b through which a V-phase AC current flows.

[0057] Bus bar 216a has a terminal portion extending in the R direction that electrically connects a pair of coil ends 2121b on the R1 direction side and a pair of coil ends 2121b on the R2 direction side. Bus bar 216a has a terminal portion protruding in the Z1 direction from a central portion in the R direction. Connection wire 21e is electrically connected to the terminal portion protruding in the Z1 direction.

[0058] Thus, first lead portion 214, second lead portion 215 and third lead portion 216 have bus bar 214a, bus bar 215a and bus bar 216a, respectively, to which coil end 2121b (end portion) of stator coil 212b is connected.

[0059] 8, the first drawer portion 214, the second drawer portion 215, and the third drawer portion 216 are arranged at equal angular intervals of θ when viewed from the Z1 direction side (one side in the axial direction of the rotation center axis C) with the sensor board 21c arranged between the R direction bus bars 214a and 216a. Specifically, the central portion in the R direction of the first drawer portion 214, the central portion in the R direction of the second drawer portion 215, and the central portion in the R direction of the third drawer portion 216 are arranged at equal angular intervals of θ when viewed from the Z1 direction side. Here, the angle θ is 120 degrees.

[0060] <Sensor yoke> 9, the sensor yoke 217 is fixed to the rotor shaft 2111. As a result, the sensor yoke 217 rotates integrally with the rotor shaft 2111 as it rotates in the R1 direction and the R2 direction. The sensor yoke 217 is a ferromagnetic member such as iron. The sensor yoke 217 is formed in an annular shape when viewed from the Z1 direction side.

[0061] <Sensor magnet> The sensor magnet 218 is configured to apply a magnetic field to the rotation angle sensor 21d. The sensor magnet 218 is alternately magnetized to anode and cathode in the R direction. The sensor magnet 218 rotates integrally with the rotor 211 (rotor shaft 2111) while being accommodated in the concave accommodation space Sp on the D2 direction side (inner side) of each of the first lead portion 214, the second lead portion 215, and the third lead portion 216. That is, the sensor magnet 218 is attached to the tip portion on the D1 direction side of the sensor yoke 217. The sensor magnet 218 protrudes toward the Z1 direction. The sensor magnet 218 is formed in a ring shape when viewed from the Z1 direction side.

[0062] (sensor board) As shown in FIG. 8, the sensor board 21c is a printed circuit board or the like on which electronic components such as a rotation angle sensor 21d (see FIG. 9) are attached.

[0063] The sensor board 21c is connected to a supply line Ls, a ground line Lg, an A-phase signal line La, a B-phase signal line Lb, and a Z-phase signal line Lz. The other end of each of the supply line Ls and the ground line Lg is electrically connected to an external power source (not shown). Each of the supply line Ls and the ground line Lg is a line for supplying power to the rotation angle sensor 21d. Each of the A-phase signal line La, the B-phase signal line Lb, and the Z-phase signal line Lz is electrically connected to the control unit 4. The A-phase signal line La, the B-phase signal line Lb, and the Z-phase signal line Lz are lines for transmitting the A-phase signal, the B-phase signal, and the Z-phase signal of the rotation angle sensor 21d to the control unit 4, respectively.

[0064] The sensor board 21c is attached to the resin holder 21a. The sensor board 21c is disposed between the first drawer portion 214 and the third drawer portion 216 in the R direction of the rotor 211, and is disposed outside the concave accommodation space Sp in which the sensor magnet 218 is accommodated. In this manner, the sensor board 21c is disposed outside the recess 213b of the end frame 213. When viewed from the Z1 direction side, the sensor board 21c is larger than the dimension of the space other than the rotor shaft 2111 in the concave accommodation space Sp. Specifically, when viewed from the Z1 direction side, the length of the sensor board 21c in the D direction is larger than the dimension Ld of one side of the concave accommodation space Sp in the D direction. Also, the length of the sensor board 21c in the direction perpendicular to the D direction is larger than the dimension Ld of one side of the concave accommodation space Sp in the D direction when viewed from the Z1 direction side.

[0065] 9, the sensor board 21c is disposed between the first lead portion 214 and the third lead portion 216 in the R direction, and is disposed outside the concave accommodation space Sp on the Z2 side (the stator core 212a side) of the tip position Pe of the coil end 2121b of the stator coil 212b. That is, the sensor board 21c is disposed on the Z2 side of the tip position Pe, and on the Z1 side of the position Pf of the end face of the end frame 213 on the Z1 side (the sensor board 21c side).

[0066] The sensor board 21c is disposed on the Z2 side (the stator core 212a side) of the connection lines 21e in the Z direction. That is, the sensor board 21c is disposed on the Z2 side of the position Pl of the Z2 side end of the connection line 21e that is furthest in the Z2 direction among the multiple connection lines 21e, and on the Z1 side of the position Pf of the end face of the end frame 213 on the Z1 side (the sensor board 21c side).

[0067] Furthermore, in the cross section taken along the D direction, the position Pb1 of the end portion on the D1 direction side of the sensor board 21c is disposed on the D2 direction side (inner) than the position Pdf of the end portion on the D1 direction of the end frame 213. In the cross section taken along the D direction, the position Pb2 of the end portion on the D2 direction side of the sensor board 21c is disposed on the D1 direction side (outer) than the rotor shaft 2111.

[0068] (Rotation angle sensor) 9, rotation angle sensor 21d is a sensor for acquiring the rotation angle of rotor 211. Rotation angle sensor 21d is disposed on the Z1 direction side of sensor magnet 218 (the side opposite to stator core 212a).

[0069] 10, when viewed from the Z1 direction side, the rotation angle sensor 21d is disposed at a position at which at least a part of the sensor magnet 218 is shifted. Here, in FIG. 10, for convenience of explanation, the sensor magnet 218 is hatched.

[0070] Specifically, when viewed from the Z1 direction, the tip portion of rotation angle sensor 21d on the D2 direction side overlaps with sensor magnet 218, but the portion on the D1 direction side other than the tip portion on the D2 direction side does not overlap with sensor magnet 218. In other words, when viewed from the Z1 direction, rotation angle sensor 21d is disposed at a position shifted toward the D1 direction side with respect to sensor magnet 218. In this way, rotation angle sensor 21d is disposed at a position where it does not entirely overlap with sensor magnet 218 when viewed from the Z1 direction.

[0071] 9, a magnetic field is applied to the rotation angle sensor 21d from the sensor magnet 218. As an example of the applied magnetic field, a magnetic field in a Dm direction inclined toward the D1 direction with respect to the Z1 direction is shown in FIG.

[0072] 10, rotation angle sensor 21d is a sensor that detects the magnetization direction Mh in a plane perpendicular to the Z direction that has changed due to the magnetic field applied from sensor magnet 218. Specifically, rotation angle sensor 21d is a magnetoresistance effect element that detects the change in magnetization direction Mh in a plane perpendicular to the Z direction. Rotation angle sensor 21d is a TMR element, but may be a GMR element or the like.

[0073] Since the rotation angle sensor 21d is disposed at a position at least partially offset from the sensor magnet 218, the applied magnetic field is in the Dm direction inclined with respect to the Z direction, so that it is possible to reliably and accurately obtain each of the components of the Dm1 direction and the Dm2 direction in the magnetization direction changed by the magnetic field. The Dm1 direction is one direction perpendicular to the D1 direction in a plane perpendicular to the Z direction. The Dm2 direction is a direction parallel to the D1 direction in a plane perpendicular to the Z direction. The rotation angle sensor 21d obtains a component of the magnetization direction Mh obtained by combining the component of the magnetization direction in the Dm1 direction and the component of the magnetization direction in the Dm2 direction. The rotation angle sensor 21d is configured to obtain an A-phase signal, a B-phase signal, and a Z-phase signal based on the rotation angle θm of the component of the magnetization direction Mh with respect to the Dm1 direction. The A-phase signal, the B-phase signal, and the Z-phase signal are transmitted to the control unit 4, whereby the rotation angle of the rotor 211 is obtained in the control unit 4.

[0074] Therefore, since the rotation angle sensor 21d is positioned at least partially offset from the sensor magnet 218, it is possible to reliably and accurately obtain each of the components in the Dm1 direction and the Dm2 direction, and therefore it is possible to reliably and accurately obtain the rotation angle of the rotor 211.

[0075] (connecting line) As shown in Fig. 11, the connection line 21e is configured to supply power to the motor 21b. The connection line 21e is electrically connected to the control unit 4. The control unit 4 supplies the connection line 21e with AC currents of U-phase, V-phase, and W-phase. A plurality of (three) connection lines 21e are provided in accordance with the AC currents of U-phase, V-phase, and W-phase. The plurality of connection lines 21e are connected to the first lead portion 214, the second lead portion 215, and the third lead portion 216, respectively.

[0076] The connection line 21e is detouring so as not to overlap the rotation angle sensor 21d attached to the sensor board 21c when viewed from the Z1 direction side.

[0077] Specifically, the connection line 21e connected to the first lead portion 214 makes a detour by extending along the R1 direction so as to pass between the rotor shaft 2111 and the second lead portion 215 and between the rotation angle sensor 21d and the third lead portion 216, rather than on the R2 direction side when viewed from the Z1 direction side. The connection line 21e connected to the second lead portion 215 makes a detour by extending along the R1 direction so as to pass between the rotor shaft 2111 and the second lead portion 215 and between the rotation angle sensor 21d and the third lead portion 216, rather than on the R2 direction side when viewed from the Z1 direction side. The connection line 21e connected to the third lead portion 216 makes a detour by extending along the R1 direction so as to pass between the rotation angle sensor 21d and the third lead portion 216, rather than on the R2 direction side when viewed from the Z1 direction side.

[0078] (Effects of this embodiment) In this embodiment, the following effects can be obtained.

[0079] In the present embodiment, as described above, the sensor board 21c is disposed between the first lead portion 214 and the third lead portion 216 in the R direction of the rotor 211, and is disposed outside the concave accommodation space Sp in which the sensor magnet 218 is accommodated. As a result, even if the dimensions of the sensor board 21c are increased in accordance with a change to a larger rotation angle sensor 21d with higher resolution, the sensor board 21c is not disposed on the first lead portion 214, the second lead portion 215, and the third lead portion 216, because the sensor board 21c is disposed outside the concave accommodation space Sp, between the first lead portion 214 and the third lead portion 216 in the R direction of the rotation center axis C of the rotor 211. That is, by arranging the sensor board 21c at positions offset from the first drawer portion 214, the second drawer portion 215, and the third drawer portion 216 in the R direction, the sensor board 21c does not overlap with the first drawer portion 214, the second drawer portion 215, and the third drawer portion 216 when viewed from the Z1 direction side. Therefore, compared to a case in which the sensor board 21c is arranged on the first drawer portion 214, the second drawer portion 215, and the third drawer portion 216, it is possible to prevent the motor device 21 from becoming large in size in the Z direction. As a result, even if a large sensor board 21c that cannot be accommodated in the concave accommodation space Sp is provided, it is possible to prevent the motor device 21 from becoming large in size in the Z direction.

[0080] In the present embodiment, as described above, the multiple lead-out portions include the first lead-out portion 214, the second lead-out portion 215, and the third lead-out portion 216 through which AC currents of U-phase, V-phase, and W-phase flow, respectively. The first lead-out portion 214, the second lead-out portion 215, and the third lead-out portion 216 each include a bus bar 214a, a bus bar 215a, and a bus bar 216a to which the coil end 2121b (end portion) of the stator coil 212b is connected. The first lead-out portion 214, the second lead-out portion 215, and the third lead-out portion 216 are each arranged at equal angular intervals of θ with the sensor board 21c arranged between the bus bars 214a and 216a in the R direction when viewed from the Z1 direction side (one side in the Z direction of the rotation center axis C). As a result, bus bars 214a, 215a and 216a are arranged at equal angular intervals θ in the R direction, so that sensor board 21c can be arranged between any of bus bars 214a, 215a and 216a, thereby improving the freedom of arrangement of sensor board 21c.

[0081] In this embodiment, as described above, the rotation angle sensor 21d is a sensor that detects the magnetization direction Mh in a plane perpendicular to the Z direction of the rotation center axis C, which is changed by the magnetic field applied from the sensor magnet 218. The rotation angle sensor 21d is disposed at a position at which at least a part is shifted from the sensor magnet 218 when viewed from the Z1 direction side (one side of the Z direction). As a result, since the rotation angle sensor 21d is disposed at a position at which at least a part is shifted from the sensor magnet 218, the magnetic field applied to the rotation angle sensor 21d can be in the Dm direction (inclined direction) with respect to the Z direction. In this case, it is possible to reliably generate a magnetic field component perpendicular to the radial direction in the plane perpendicular to the Z direction, and a magnetic field component parallel to the radial direction in the plane perpendicular to the Z direction. As a result, it is possible to reliably detect the magnetization direction Mh in the plane perpendicular to the Z direction, which is a combination of both the above-mentioned magnetic field components, and therefore it is possible to reliably obtain the rotation angle of the rotor 211 based on the magnetization direction Mh.

[0082] In the present embodiment, as described above, the motor device 21 includes the connection line 21e that supplies power to the motor 21b. The sensor board 21c is disposed closer to the stator core 212a than the connection line 21e in the Z direction of the rotation center axis C. This allows the sensor board 21c to be disposed in a position in the Z direction closer to the stator core 212a than the connection line 21e, thereby further preventing the motor device 21 from becoming large in size in the Z direction.

[0083] In the present embodiment, as described above, each of the stator coils 212b is connected by a delta connection (see FIG. 5). This allows the number of bus bars to be reduced compared to when each of the stator coils 212b is connected by a Y connection, thereby suppressing an increase in the number of parts of the motor 21b.

[0084] [Variations] The above-described embodiments disclosed herein should be considered as illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims, not by the description of the above-described embodiments, and further includes all modifications (variations) within the meaning and scope of the claims.

[0085] For example, in the above embodiment, the motor device 21 is applied to the brake system 100, but the present invention is not limited to this. In the present invention, the motor device may be applied to a system other than a brake system, such as changing from a low-resolution rotation angle sensor to a high-resolution rotation angle sensor.

[0086] In the above embodiment, the motor device 21 is applied to vehicles including an electric vehicle having a drive motor and a hybrid vehicle having a drive motor and an engine, but the present invention is not limited to this. In the present invention, the motor device may be applied to vehicles other than vehicles.

[0087] In the above embodiment, the "plurality of drawer sections" in the claims are the first drawer section 214, the second drawer section 215, and the third drawer section 216, but the present invention is not limited to this. In the present invention, the number of the plurality of drawer sections may be two, or four or more.

[0088] In the above embodiment, the sensor board 21c is disposed outside the concave accommodation space Sp on the Z2 side (on the stator core side) of the tip position Pe of the coil end 2121b (end) of the stator coil 212b, but the present invention is not limited to this. The sensor board may be disposed outside the concave accommodation space Sp at a position slightly away from the tip position of the end of the stator coil on the Z1 side.

[0089] In the above embodiment, the tip portion of the rotation angle sensor 21d on the D2 direction side overlaps with the sensor magnet 218 when viewed from the Z1 direction side, but the portion on the D1 direction side other than the tip portion on the D2 direction side does not overlap with the sensor magnet 218, but the present invention is not limited to this. In the present invention, the rotation angle sensor does not have to entirely overlap with the sensor magnet when viewed from the Z1 direction side. [Explanation of symbols]

[0090] 21 Motor device 21b Motor 21c Sensor board 21d Rotation angle sensor 21e Connection line 211 Rotor 212 Stator 212a Stator core 212b Stator coil 214 First drawer 214a Busbar (conductor part) 215 Second drawer 215a Busbar (conductor part) 216 Third drawer 216a Busbar (conductor part) 218 Sensor Magnet 2121b Coil end (end of stator coil) C Rotational axis Mh magnetization direction Sp Concave storage space θ angle

Claims

1. a motor including a rotor, a stator including a stator core and a stator coil disposed on the stator core, a plurality of lead-out portions including ends of the stator coil led out of the stator core, and a sensor magnet that rotates integrally with the rotor while being accommodated in a concave accommodation space on the inside in a radial direction of a central axis of rotation of the rotor of the plurality of lead-out portions; a rotation angle sensor arranged on a side opposite to the stator core side of the sensor magnet, for acquiring a rotation angle of the rotor; a sensor board on which the rotation angle sensor is mounted, A motor device, wherein the sensor board is arranged between the multiple draw-out portions in the circumferential direction of the central axis of rotation of the rotor, and is arranged outside the concave accommodation space in which the sensor magnet is accommodated.

2. the plurality of lead-out portions include a first lead-out portion, a second lead-out portion and a third lead-out portion through which U-phase, V-phase and W-phase AC currents flow, respectively; 2. The motor device of claim 1, wherein each of the first lead-out portion, the second lead-out portion and the third lead-out portion has a conductor portion to which an end of the stator coil is connected, and when viewed from one axial side of the central axis of rotation, is arranged at equal angular intervals with the sensor board disposed between the conductor portions in the circumferential direction.

3. the rotation angle sensor is a sensor that detects a magnetization direction in a plane perpendicular to the axial direction of the rotation central axis, the magnetization direction being changed by a magnetic field applied from the sensor magnet; The motor device according to claim 1 , wherein the rotation angle sensor is disposed at a position at least partially offset from the sensor magnet when viewed from one side in the axial direction.

4. A connection line for supplying power to the motor is further provided. The motor device according to claim 1 , wherein the sensor board is disposed closer to the stator core than the connection line is in the axial direction of the central axis of rotation.

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