JP2023074053A - motor - Google Patents

Abstract

To provide a motor capable of reducing the number of components even while regulating movements of a power supply substrate in a direction of extension of a plurality of terminal pins, the motor comprising the plurality of terminal pins extending in the same direction toward an outer peripheral side of a motor case and the power supply substrate fixed at a tip end side of the plurality of terminal pins.SOLUTION: In a motor 1, when a direction of extension of a plurality of terminal pins 23 toward an outer peripheral side of a motor case 21 is defined as a direction Y2, a regulation part 22d which is in contact with a power supply substrate 7 from a side in the direction Y2 and regulates movements of the power supply substrate 7 toward the side of the direction Y2 is formed in a bearing holding plate 22 which holds a bearing 16 rotatably supporting a rotor and is fixed to the motor case 21.SELECTED DRAWING: Figure 2

Description

The present invention relates to a motor including a rotor having driving magnets and a stator having driving coils arranged on the outer peripheral side of the driving magnets.

Conventionally, a rotor having a rotating shaft on which a feed screw shaft is formed and a driving magnet, a stator having a driving coil arranged on the outer peripheral side of the driving magnet, and a frame fixed to the output side end of the stator. A motor provided with such a motor is known (see Patent Document 1, for example). In the motor disclosed in Patent Literature 1, the stator includes a motor case in which the drive coil is housed, and four terminal pins to which ends of the drive coil are fixed. The four terminal pins extend in the same direction toward the outer circumference of the motor case and are arranged outside the motor case. A power feeding board is soldered and fixed to the tip side of the terminal pin. A substrate holding member that holds the power supply substrate is attached to the stator.

JP 2019-54648 A

In the motor disclosed in Patent Document 1, since the board holding member holds the power supply board, movement of the power supply board in the direction in which the four terminal pins extend is also restricted. However, the motor described in Patent Document 1 requires a substrate holding member, which is a dedicated member for holding the power supply substrate, in order to restrict the movement of the power supply substrate in the direction in which the four terminal pins extend. become. Therefore, in the motor disclosed in Patent Document 1, the number of parts of the motor increases, the size of the motor increases, and there is a possibility that the cost of the motor increases.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a motor including a plurality of terminal pins extending in the same direction toward the outer periphery of a motor case, and a power supply board fixed to the distal end side of the plurality of terminal pins, in which the plurality of terminal pins are provided. To provide a motor capable of reducing the number of parts even if it is possible to restrict the movement of a power supply board in the extending direction.

In order to solve the above problems, the motor of the present invention has a rotor having a driving magnet, a stator having a driving coil arranged on the outer peripheral side of the driving magnet, and the driving coil are electrically connected. The stator includes a plate-like power supply board, and the stator includes a motor case in which a drive coil is accommodated, a bearing holding plate that holds a bearing that rotatably supports the rotor and is fixed to the motor case, and a drive coil. and a plurality of terminal pins having ends electrically connected to each other and having at least tip portions disposed outside the motor case, the plurality of terminal pins extending in the same direction toward the outer peripheral side of the motor case. Assuming that the direction in which the plurality of terminal pins extend toward the outer peripheral side of the motor case is defined as a first direction, the power supply board is arranged outside the motor case and includes the plurality of terminal pins on the tip side of the plurality of terminal pins. is fixed to the first direction side of the bearing holding plate, and the bearing holding plate is formed with a restricting portion that contacts the power feeding substrate from the first direction side and restricts the movement of the power feeding substrate in the first direction side. Characterized by

In the motor of the present invention, if the direction in which the plurality of terminal pins extend toward the outer peripheral side of the motor case is defined as the first direction, power is supplied from the first direction side to the bearing holding plate that holds the bearing that rotatably supports the rotor. A restricting portion is formed to contact the power supply substrate and restrict the movement of the power supply substrate in the first direction. That is, in the present invention, the bearing holding plate that holds the bearing is used to restrict the movement of the power supply substrate in the first direction, which is the direction in which the plurality of terminal pins extend. Therefore, in the present invention, there is no need to provide a dedicated member for restricting the movement of the power supply board in the direction in which the terminal pins extend. Therefore, in the present invention, it is possible to reduce the number of parts of the motor even though it is possible to restrict the movement of the power supply board in the direction in which the plurality of terminal pins extend.

In the present invention, the power feeding substrate is formed with a convex portion projecting toward the outer peripheral side of the power feeding substrate formed in a flat plate shape, and the restricting portion is in contact with the convex portion from the first direction side. is preferred. With this configuration, it is possible to prevent the restricting portion from coming into contact with the portion of the power supply substrate where the wiring pattern is formed.

In the present invention, the bearing holding plate is formed in a flat plate shape, and the bearing holding plate is formed with a through hole that penetrates the bearing holding plate in the thickness direction of the bearing holding plate and into which the projection is inserted. It is preferable that a portion of the plate arranged on the first direction side of the through-hole serves as a restricting portion. With this configuration, both sides of the restricting portion in the direction orthogonal to the first direction are connected to the main body portion of the bearing holding plate. It becomes possible to restrict the movement of the power feeding substrate in the orthogonal direction.

In the present invention, the motor includes a movable body that engages with the feed screw shaft of the rotor and moves linearly in the axial direction of the feed screw shaft when the feed screw shaft rotates, and a movable body in the axial direction of the feed screw shaft. Equipped with a detector for detecting the position and a frame fixed to the motor case, the axial direction of the rotor, which is the axial direction of the feed screw shaft, is orthogonal to the first direction, and is one of the axial directions of the rotor. Assuming that the output side is the output side and the other axial side of the rotor is the counter-output side, the movable body is arranged on the output side of the motor case, and the frame rotatably supports the end of the feed screw on the output side. The output side bearing is held and fixed to the output side end face of the motor case, the bearing holding plate is fixed to the non-output side end face of the motor case, and the detector is a detector body fixed to the frame, A second terminal pin protruding from the detector main body is preferably provided, and the second terminal pin is preferably inserted into and fixed to the power supply board.

With this configuration, the restricting portion of the bearing holding plate restricts the movement of the power supply substrate in the first direction on the counter-output side, and the frame fixed to the end face of the motor case on the output side. It is possible to restrict the movement of the power supply substrate in the first direction on the output side by the detector fixed to the . Therefore, it is possible to effectively restrict the movement of the power supply substrate in the direction in which the plurality of terminal pins extend.

In the present invention, the stator includes a terminal block to which the base end portions of the plurality of terminal pins are fixed, and the terminal block includes a plurality of terminals capable of contacting the surface of the power supply board opposite to the surface facing the first direction. support pins are preferably formed. With this configuration, it is possible to restrict the movement of the power supply substrate in the direction opposite to the first direction by using the plurality of support pins formed on the terminal block.

In the present invention, for example, the bearing holding plate includes a contact portion that contacts one end surface of the rotor in the axial direction of the motor case, and a projecting portion that projects in the first direction from the contact portion, At least part of the outer peripheral surface of the contact portion is arranged along the outer peripheral surface of the motor case when viewed from the direction, and the restricting portion is formed on the projecting portion. In this case, for example, the shape of the outer peripheral surface of the motor case when viewed from the axial direction of the rotor is a circular shape, and when viewed from the axial direction of the rotor, the outer peripheral surface of the motor case has a circular shape. The shape of at least a part of the outer peripheral surface of the arranged contact portion is arcuate. In this case, part of the outer peripheral surface of the contact portion arranged along the outer peripheral surface of the motor case can be easily fixed to the motor case by laser welding.

In the present invention, the motor includes a movable body that engages with the feed screw shaft of the rotor and moves linearly in the axial direction of the feed screw shaft when the feed screw shaft rotates, and a movable body that moves in the axial direction of the feed screw shaft. The rotor includes a guide shaft for guiding and a frame fixed to the motor case, the axial direction of the rotor, which is the axial direction of the feed screw shaft, is orthogonal to the first direction, and one side of the rotor in the axial direction is the output side. Assuming that the other side of the rotor in the axial direction is the counter-output side, the movable body is arranged on the output side of the motor case, and the frame is an output-side bearing that rotatably supports the output-side end of the feed screw. a flat plate-shaped bearing holding portion that holds a bearing, a flat plate-shaped fixed portion that is fixed to the end face of the motor case on the output side, and a flat plate-shaped connection portion that connects the bearing holding portion and the fixed portion; The holding portion rises in a predetermined direction from the output side end of the connection portion, the fixed portion rises in the same direction as the bearing holding portion from the non-output side end of the connection portion, and rises from the non-output side end of the guide shaft. The fixed portion is press-fitted and fixed to the fixed portion, and the fixed portion may include an outer peripheral direction projecting portion that projects further to the outer peripheral side of the motor case than the outer peripheral surface of the motor case when viewed from the axial direction of the rotor. preferable.

According to this structure, in a state in which the non-output side surface of the outer peripheral direction projecting portion is abutted against a predetermined jig, the non-output side of the guide shaft is applied to the fixed portion fixed to the output side end surface of the motor case. It becomes possible to press-fit the side end from the output side. Therefore, it is possible to receive the press force when the end portion of the guide shaft on the non-output side is press-fitted from the output side into the portion to be fixed that is fixed to the end face of the motor case on the output side. . Therefore, deformation of the motor case can be prevented even when the guide shaft is press-fitted into the fixed portion that is fixed to the end surface of the motor case on the output side.

In the present invention, the shape of the outer peripheral surface of the motor case when viewed in the axial direction of the rotor is circular, and the shape of the fixed portion when viewed in the axial direction of the rotor is square or rectangular. It is preferable that the four corner portions of the fixed portion when viewed from the axial direction of the rotor are protruding portions in the outer peripheral direction. According to this structure, it is possible to receive the pressing force when the guide shaft is press-fitted into the fixed portion by the outer peripheral projections formed at the four corners of the fixed portion. Therefore, it is possible to reliably receive the pressing force when the guide shaft is press-fitted into the fixed portion by the outer peripheral direction projecting portion.

In the present invention, the motor includes, for example, a movable body that engages with the feed screw shaft of the rotor and moves linearly in the axial direction of the feed screw shaft when the feed screw shaft rotates, and a frame that is fixed to the motor case. and the axial direction of the rotor, which is the axial direction of the feed screw shaft, is orthogonal to the first direction, one side of the rotor in the axial direction is the output side, and the other side in the axial direction of the rotor is the counter-output side. Then, the movable body is arranged on the output side of the motor case, and the frame includes a bearing holder that holds an output side bearing that rotatably supports the output side end of the feed screw, and an output side of the motor case. A fixed portion fixed to an end surface and a connection portion connecting the bearing holding portion and the fixed portion are provided, and when viewed from the axial direction of the rotor, at least a part of the outer peripheral surface of the fixed portion is the motor case. are arranged along the outer peripheral surface of the

In this case, for example, the shape of the outer peripheral surface of the motor case when viewed from the axial direction of the rotor is a circular shape, and when viewed from the axial direction of the rotor, the outer peripheral surface of the motor case has a circular shape. At least a part of the outer peripheral surface of the arranged fixed portion has an arc shape. In this case, part of the outer peripheral surface of the fixed portion arranged along the outer peripheral surface of the motor case can be easily fixed to the motor case by laser welding.

As described above, according to the present invention, in a motor including a plurality of terminal pins extending in the same direction toward the outer periphery of a motor case, and a power supply substrate fixed to the distal end side of the plurality of terminal pins, the plurality of terminal pins Even if it is possible to restrict the movement of the power supply substrate in the direction in which the motor extends, it is possible to reduce the number of parts of the motor.

1 is a side view of a motor according to an embodiment of the invention; FIG. 2 is a perspective view of a portion of the motor shown in FIG. 1; FIG. Figure 2 is a plan view of a portion of the motor shown in Figure 1; FIG. 2 is a side view showing a portion of the motor shown in FIG. 1 from the opposite side; FIG. 2 is a cross-sectional view of the EE cross section of FIG. 1; FIG. 2 is a rear view showing the stator, frame, bearings, and leaf springs extracted from FIG. 1; FIG. 2 is a view showing the motor case and frame from the FF direction of FIG. 1; FIG. 4 is a schematic diagram for explaining the configuration of a bearing holding plate according to another embodiment of the present invention; FIG. 5 is a schematic diagram for explaining the configuration of a bearing holding plate and a power supply board according to another embodiment of the present invention;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Motor configuration)
FIG. 1 is a side view of a motor 1 according to an embodiment of the invention. FIG. 2 is a perspective view of part of the motor 1 shown in FIG. FIG. 3 is a plan view of part of the motor 1 shown in FIG. FIG. 4 is a side view showing part of the motor 1 shown in FIG. 1 from the opposite side. FIG. 5 is a cross-sectional view of the EE section of FIG. FIG. 6 is a rear view showing the stator 6, frame 14, bearing 16 and leaf spring 17 shown in FIG. FIG. 7 is a diagram showing the motor case 21 and the frame 14 from the FF direction of FIG.

The motor 1 of this embodiment is a stepping motor. The motor 1 includes a rotor 4 having a rotating shaft 2 and a driving magnet 3 (see FIG. 5), a stator 6 having a driving coil 5 (see FIG. 5) arranged on the outer peripheral side of the driving magnet 3, and a driving and a flat plate-shaped power supply substrate 7 to which the coil 5 is electrically connected. The output side portion of the rotating shaft 2 protrudes further to the output side than the stator 6 . A portion of the rotary shaft 2 protruding from the stator 6 is a feed screw shaft (lead screw) 2a having a feed screw formed on the outer peripheral surface thereof. That is, the rotor 4 has a feed screw shaft 2a. The motor 1 has a movable body 8 that engages with the feed screw shaft 2a. The movable body 8 moves linearly in the axial direction of the feed screw shaft 2a when the feed screw shaft 2a rotates.

In the following description, the axial direction of the rotor 4, which is the axial direction of the feed screw shaft 2a (that is, the axial direction of the rotating shaft 2, the X direction in FIG. 1, etc.) is defined as the front-rear direction. The X1 direction side, such as in FIG. Also, in the following description, for convenience of explanation, the Y direction in FIG. 1 etc. orthogonal to the front-rear direction is defined as the horizontal direction, and the Z direction in FIG. 1 etc. orthogonal to the front-rear direction and the horizontal direction is defined as the vertical direction.

In the following description, the Y1 direction, which is one side in the horizontal direction, is defined as the "right" side, the Y2 direction side, which is the other side in the horizontal direction, is defined as the "left" side, and the Z1 direction, which is one side in the vertical direction. side is defined as the "upper" side, and the Z2 direction side, which is the other side in the vertical direction, is defined as the "lower" side. The front side (X1 direction side) of this embodiment is the output side, which is one side of the rotor 4 in the axial direction, and the rear side (X2 direction side) is the opposite side, which is the other side of the rotor 4 in the axial direction. It has become.

The motor 1 includes two guide shafts 11 for guiding the movable body 8 in the longitudinal direction (that is, the axial direction of the feed screw shaft 2a), and a detector 12 for detecting the position of the movable body 8 in the longitudinal direction. I have. The motor 1 also includes a frame 14 fixed to the stator 6, bearings 15 (see FIG. 1) and bearings 16 that rotatably support the rotor 4, and the rear end of the rotating shaft 2 that is in contact with the rotating shaft 2. and a leaf spring 17 that biases forward.

The bearing 15 rotatably supports the front end of the rotary shaft 2 (that is, the output-side end of the feed screw shaft 2a). The bearing 16 rotatably supports the rear end of the rotating shaft 2 . The bearing 15 of this embodiment is an output side bearing. As shown in FIG. 5, the drive magnet 3 is formed in a thick cylindrical shape. The drive magnet 3 is fixed to the rear end portion of the rotary shaft 2 and is arranged behind the feed screw shaft 2a. The driving magnet 3 is arranged inside the stator 6 .

The stator 6 includes an outer stator core 18 and an inner stator core 19 having a plurality of pole teeth arranged opposite to each other on the outer peripheral surface of the driving magnet 3, and a bobbin 20 (see FIG. 5) around which the driving coil 5 is wound. , a bearing holding plate 22 for holding the bearing 16, and a plurality of terminal pins 23 to which ends of the driving coil 5 are electrically connected. The stator 6 has a two-phase structure having two drive coils 5 spaced apart in the front-rear direction. A bobbin 20 and four terminal pins 23 are provided.

The outer stator core 18 includes a plate-shaped and substantially annular annular plate portion 18a to which the roots of the plurality of pole teeth are connected, and a cylindrical case portion 18b that covers the outer peripheral surface of the drive coil 5. As shown in FIG. The annular plate portion 18a is arranged so that the thickness direction of the annular plate portion 18a is aligned with the front-rear direction. The pole teeth of the outer stator core 18 are connected to the inner peripheral end of the annular plate portion 18a. The case portion 18b is connected to the outer peripheral end of the annular plate portion 18a.

The inner stator core 19 includes a plate-shaped and substantially annular annular plate portion 19a to which bases of a plurality of pole teeth are connected. The annular plate portion 19a is arranged so that the thickness direction of the annular plate portion 19a is aligned with the front-rear direction. The pole teeth of the inner stator core 19 are connected to the inner peripheral end of the annular plate portion 19a. The pole teeth of the outer stator core 18 and the pole teeth of the inner stator core 19 are alternately arranged in the circumferential direction of the rotor 4 .

The two annular plate portions 19a are arranged adjacent to each other in the front-rear direction. Also, the two annular plate portions 19a are arranged between the two drive coils 5 in the front-rear direction. The two annular plate portions 18a are arranged outside the two drive coils 5 in the front-rear direction, and the drive coils 5 are arranged between the annular plate portions 18a and 19a in the front-rear direction. It is The bobbin 20 is arranged between the annular plate portion 18a and the annular plate portion 19a in the front-rear direction. The bobbin 20 is arranged between the driving coil 5 and the plurality of pole teeth in the radial direction of the rotor 4, and the driving coil 5 is arranged on the outer peripheral side of the plurality of pole teeth via the bobbin 20. are placed.

The rear end face of the case portion 18b arranged on the front side and the front end face of the case portion 18b arranged on the rear side are welded and fixed in contact with each other. In this embodiment, the two annular plate portions 18a and the two case portions 18b constitute a motor case 21 in which the drive coil 5 is accommodated. That is, the stator 6 has a motor case 21 in which the drive coil 5 is housed. The motor case 21 is formed in a thick cylindrical shape as a whole. The shape of the outer peripheral surface of the motor case 21 when viewed from the front-rear direction is circular. The front end surface and the rear end surface of the motor case 21 (that is, the front surface of the annular plate portion 18a arranged on the front side and the rear surface of the annular plate portion 18a arranged on the rear side) form an annular plane orthogonal to the front-rear direction. there is

The two bobbins 20 are formed with terminal blocks 20a to which base ends of four terminal pins 23 are fixed. That is, the stator 6 has a terminal block 20a to which base ends of four terminal pins 23 are fixed. The terminal block 20 a protrudes outward from the outer peripheral surface of the motor case 21 . Specifically, the terminal block 20 a protrudes leftward from the outer peripheral surface of the motor case 21 . The terminal block 20a is arranged at the center of the stator 6 in the front-rear direction. The motor case 21 is formed with an opening 21a in which the root portion of the terminal block 20a is arranged.

The four terminal pins 23 are staggered in the vertical direction. At least the tip portions of the four terminal pins 23 whose base ends are fixed to the terminal block 20 a are arranged outside the motor case 21 . In this embodiment, all four terminal pins 23 are arranged outside the motor case 21 . The terminal pin 23 is formed linearly. The four terminal pins 23 extend in the same direction toward the outer circumference of the motor case 21 . Specifically, the four terminal pins 23 extend leftward. That is, the four terminal pins 23 protrude leftward from the terminal block 20a. The left direction (Y2 direction) in this embodiment is the first direction in which the four terminal pins 23 extend toward the outer circumference of the motor case 21 .

The power supply substrate 7 is a flat rigid substrate such as a glass epoxy substrate. The power supply substrate 7 is formed in a rectangular flat plate shape. The power supply substrate 7 is arranged so that the thickness direction of the power supply substrate 7 is aligned with the left-right direction. The power supply substrate 7 is formed with a convex portion 7a projecting toward the outer peripheral side of the power supply substrate 7 formed in a flat plate shape. The convex portion 7a protrudes rearward. The convex portion 7a is formed in an elongated rectangular shape whose long side direction is the vertical direction. The convex portion 7a is formed at the central portion of the power supply substrate 7 in the vertical direction. A lead wire 24 is drawn out from the power supply substrate 7 . In this embodiment, six lead wires 24 are led out from the lower end portion of the power supply substrate 7 toward the right side. 3 and 5, illustration of the lead wire 24 is omitted.

The power supply substrate 7 is fixed to the distal end sides of the four terminal pins 23 . That is, the power supply board 7 is fixed to the left end side of the four terminal pins 23 . Further, the power supply substrate 7 is fixed by soldering to the left end sides of the four terminal pins 23 . A through hole into which the terminal pin 23 is inserted is formed in the power supply substrate 7 . This through hole is formed in the central portion of the power supply substrate 7 in the front-rear direction. Further, the feed substrate 7 is also formed with a through hole into which a terminal pin 31 (to be described later) forming part of the detector 12 is inserted. This through hole is formed in the front end portion of the power supply board 7 .

The power supply substrate 7 is arranged outside the motor case 21 . Specifically, the power supply substrate 7 is arranged on the left side of the motor case 21 . Further, the power supply substrate 7 is arranged on the left side of the terminal block 20a. A plurality of support pins 20b that can come into contact with the right surface of the power supply substrate 7 are formed on the terminal block 20a. A plurality of support pins 20b are formed at the left end of the terminal block 20a. The support pin 20b is formed in a cylindrical shape and protrudes leftward. A left end surface of the support pin 20b is a plane orthogonal to the left-right direction. A slight gap is formed between the left end surface of the support pin 20b and the right surface of the power supply substrate 7. As shown in FIG. A plurality of support pins 20b are formed at predetermined intervals in the vertical direction at each of the front end portion and the rear end portion of the terminal block 20a.

The bearing holding plate 22 is formed in a flat plate shape. The bearing holding plate 22 is arranged so that the thickness direction of the bearing holding plate 22 is aligned with the front-rear direction. The bearing holding plate 22 is fixed to the motor case 21 . Specifically, the bearing holding plate 22 is fixed to the rear end surface of the motor case 21 . The bearing holding plate 22 includes a contact portion 22a that contacts the rear end surface of the motor case 21, and a protruding portion 22b that protrudes leftward from the contact portion 22a.

The bearing holding plate 22 of this embodiment is composed of a contact portion 22a and a projecting portion 22b. The contact portion 22a is formed in a substantially disc shape. The projecting portion 22b is formed in a rectangular flat plate shape. The protruding portion 22b is arranged so that the long side direction of the protruding portion 22b is aligned with the vertical direction. The vertical width of the projecting portion 22b is narrower than the diameter of the contact portion 22a.

A through hole 22c is formed in the bearing holding plate 22 so as to pass through the bearing holding plate 22 in the front-rear direction. The through hole 22c is formed in the projecting portion 22b. Specifically, the through hole 22c is formed at the left end of the projecting portion 22b. The through hole 22c is a rectangular hole whose long side direction is the vertical direction. The convex portion 7a of the power supply substrate 7 is inserted into the through hole 22c. A rear end face of the convex portion 7 a is arranged behind the rear face of the bearing holding plate 22 . That is, the rear end surface of the power supply substrate 7 is arranged behind the rear surface of the bearing holding plate 22 . The vertical width of the through hole 22c is wider than the vertical width of the projection 7a. The width of the through hole 22c in the left-right direction is approximately equal to the thickness of the protrusion 7a (thickness in the left-right direction). As shown in FIG. 4 , the front end of the convex portion 7 a is arranged on the front side of the front surface of the bearing holding plate 22 .

A portion of the bearing holding plate 22 located on the left side of the through hole 22c serves as a restricting portion 22d that contacts the power supply substrate 7 from the left side and restricts movement of the power supply substrate 7 to the left side. That is, the bearing holding plate 22 is formed with a restricting portion 22d that contacts the power supply board 7 from the left side and restricts the movement of the power supply board 7 to the left side. The restricting portion 22d is in contact with the convex portion 7a from the left side.

As described above, the outer peripheral surface of the motor case 21 has a circular shape when viewed from the front-rear direction. Further, the contact portion 22a is formed in a substantially disc shape, and as shown in FIG. 6, the shape of the outer peripheral surface of the contact portion 22a when viewed from the front-rear direction is arcuate. The contact portion 22a is fixed to the rear end surface of the motor case 21 so that the center of curvature of the contact portion 22a coincides with the center of curvature of the motor case 21 when viewed in the front-rear direction. The radius of curvature of the contact portion 22 a is slightly smaller than the radius of curvature of the motor case 21 when viewed from the front-rear direction.

Therefore, the outer peripheral surface of the contact portion 22a is arranged along the outer peripheral surface of the motor case 21 when viewed from the front-rear direction. In this embodiment, the entire outer peripheral surface of the contact portion 22a is arranged along the outer peripheral surface of the motor case 21 when viewed from the front-rear direction. 21 may be arranged along the outer peripheral surface. In this case, the shape of a part of the outer peripheral surface of the contact portion 22a arranged along the outer peripheral surface of the motor case 21 is arcuate when viewed from the front-rear direction.

The contact portion 22a is fixed to the rear end surface of the motor case 21 by laser welding. Specifically, the outer peripheral surface of the contact portion 22a is fixed to the rear end surface of the motor case 21 by laser welding. The outer peripheral surface of the contact portion 22a is fixed to the rear end surface of the motor case 21 by, for example, laser welding at four points in the circumferential direction of the motor case 21, and is not laser-welded in the entire circumferential direction of the motor case 21.

The bearing 16 is fixed to the center of the contact portion 22a. Specifically, the bearing 16 is crimped and fixed to the center of the contact portion 22a. A through hole in which a part of the bearing 16 is arranged is formed in the central portion of the contact portion 22a. The bearing 16 is arranged behind the driving magnet 3 . The bearing 16 supports the rotating shaft 2 in the radial direction of the rotating shaft 2 . As shown in FIG. 5, between the rear end surface of the driving magnet 3 and the front end surface of the bearing 16, a receiving plate 25 formed in a flat annular shape is arranged. The leaf spring 17 is fixed to the rear surface of the bearing holding plate 22 . The plate spring 17 includes a fixed portion 17a that is fixed to the bearing holding plate 22, and a spring portion 17b that contacts the rear end of the rotating shaft 2 and biases the rotating shaft 2 forward. 5, illustration of the spring portion 17b is omitted.

Frame 14 holds bearings 15 . Also, the frame 14 is fixed to the motor case 21 . Specifically, the frame 14 is fixed to the front end surface of the motor case 21 . The frame 14 is formed by bending a metal plate into a predetermined shape. The frame 14 includes a flat plate-shaped bearing holding portion 14a that holds the bearing 15, a flat plate-shaped fixed portion 14b that is fixed to the front end surface of the motor case 21, and a flat plate that connects the bearing holding portion 14a and the fixed portion 14b. and a flat plate-shaped detector fixing portion 14d to which the detector 12 is fixed.

The connecting portion 14c is arranged so that the thickness direction of the connecting portion 14c is aligned with the vertical direction. The connecting portion 14c constitutes a lower portion of the frame 14. As shown in FIG. The bearing holding portion 14a rises upward from the front end of the connecting portion 14c. The fixed portion 14b rises upward from the rear end of the connecting portion 14c. That is, the fixed portion 14b rises from the rear end of the connecting portion 14c in the same direction as the bearing holding portion 14a. The detector fixing portion 14d rises upward from the rear end portion of the left end of the connecting portion 14c. The detector fixing portion 14 d is arranged on the left side of the power supply substrate 7 .

The bearing holding portion 14a is arranged so that the thickness direction of the bearing holding portion 14a is aligned with the front-rear direction. The fixed portion 14b is arranged so that the thickness direction of the fixed portion 14b is aligned with the front-rear direction. The detector fixing portion 14d is arranged so that the thickness direction of the detector fixing portion 14d is aligned with the left-right direction. The bearing 15 is held by the bearing holding portion 14a. The bearing 15 supports the rotating shaft 2 in the axial direction (front-rear direction) of the rotating shaft 2 and in the radial direction of the rotating shaft 2 . A through hole 14g through which the rotating shaft 2 is inserted is formed in the fixed portion 14b. A detector main body 30, which will be described later and which constitutes a part of the detector 12, is fixed to the detector fixing portion 14d.

The fixed portion 14b has a square shape when viewed from the front-rear direction. When viewed from the front-rear direction, two parallel sides of the square-shaped fixed portion 14b are parallel to the vertical direction, and the remaining two sides are parallel to the left-right direction. As shown in FIG. 7, an arc portion 14e formed in an arc shape is formed at the center portion in the vertical direction of two sides parallel to the vertical direction. That is, part of the outer peripheral surface of the fixed portion 14b is the arc portion 14e. In addition, arc portions 14e are formed at two locations on the outer peripheral surface of the fixed portion 14b. The arc portion 14e is formed in an arc shape with the center of the fixed portion 14b as the center of curvature when viewed in the front-rear direction. The fixed portion 14b is fixed to the front end surface of the motor case 21 so that the center of the fixed portion 14b and the center of the motor case 21 are aligned when viewed in the front-rear direction.

As shown in FIG. 6, when viewed in the front-rear direction, the length of one side of the fixed portion 14b is equal to the outer diameter of the outer peripheral surface of the motor case 21 formed in a circular shape. When viewed from the front-rear direction, the four corner portions of the fixed portion 14b protrude further to the outer peripheral side of the motor case 21 than the outer peripheral surface of the motor case 21 . In this embodiment, the four corner portions of the fixed portion 14b when viewed in the front-rear direction are formed as outer peripheral direction projecting portions 14f. That is, the fixed portion 14b has an outer peripheral direction projecting portion 14f that projects further to the outer peripheral side of the motor case 21 than the outer peripheral surface of the motor case 21 when viewed in the front-rear direction.

Also, the radius of curvature of the circular arc portion 14 e is slightly smaller than the radius of curvature of the motor case 21 when viewed from the front-rear direction. Therefore, the arc portion 14e, which is a part of the outer peripheral surface of the fixed portion 14b, is arranged along the outer peripheral surface of the motor case 21 when viewed from the front-rear direction. A portion of the outer peripheral surface of the fixed portion 14b arranged along the outer peripheral surface of the motor case 21 (that is, the arc portion 14e) is arcuate when viewed from the front-rear direction.

The fixed portion 14b is fixed to the front end surface of the motor case 21 by laser welding. Specifically, the arc portion 14e is fixed to the front end surface of the motor case 21 by laser welding. Each of the two circular arc portions 14e is, for example, fixed to the front end surface of the motor case 21 at two points in the circumferential direction of the motor case 21 by laser welding, and the entire circumferential region of the motor case 21 is laser welded. do not have.

The two guide shafts 11 are fixed to the frame 14 . A rear end portion of the guide shaft 11 is press-fitted and fixed to the fixed portion 14b. The guide shaft 11 is fixed to the frame 14 by press-fitting the rear end portion of the guide shaft 11 into the fixed portion 14b. The fixed portion 14b is formed with a through hole 14h (see FIG. 7) into which the rear end portion of the guide shaft 11 is press-fitted and fixed. A through hole into which the front end of the guide shaft 11 is inserted is formed in the bearing holding portion 14a. When fixing the guide shaft 11 to the frame 14, the guide shaft 11 is moved from the front side to the rear side of the bearing holding portion 14a, and the rear end portion of the guide shaft 11 is press-fitted into the fixed portion 14b.

The movable body 8 is arranged on the front side of the motor case 21 . In addition, the movable body 8 is arranged between the bearing holding portion 14a and the fixed portion 14b in the front-rear direction. The movable body 8 includes a nut member 27 (see FIG. 1) formed with a threaded hole that engages with the feed screw shaft 2a, and a slider 28 that holds the nut member 27. As shown in FIG. The slider 28 linearly moves in the front-rear direction together with the nut member 27 . A guide hole through which the guide shaft 11 is inserted is formed in the slider 28 . The slider 28 has a detected portion 28 a that is detected by the detector 12 . The detected portion 28 a constitutes the left end portion of the slider 28 . The detected portion 28a is formed in a rectangular flat plate shape. The detected portion 28a is arranged so that the thickness direction of the detected portion 28a coincides with the front-rear direction.

Detector 12 is a contact switch. The detector 12 includes a detector main body 30 fixed to the detector fixing portion 14 d of the frame 14 and terminal pins 31 protruding from the detector main body 30 . The detector 12 of this embodiment has two terminal pins 31 . The detector main body 30 is arranged on the left side of the detector fixing portion 14d. The detector main body 30 is press-fitted and fixed to the detector fixing portion 14d. As shown in FIG. 3, the right surface of the detector main body 30 is formed with a press-fit projection 30a that is press-fitted into the fixing hole of the detector fixing portion 14d.

The detector main body 30 is arranged behind the detected portion 28a of the slider 28, and detects the origin position of the movable body 8 on the rear side. The detector main body 30 has a contact portion 32 movable in the front-rear direction. The contact portion 32 protrudes forward and is biased forward. When the detected portion 28a contacts the contact portion 32 and the contact portion 32 moves rearward to a predetermined position, it is detected that the movable body 8 is at the origin position.

The two terminal pins 31 are arranged so as to overlap in the vertical direction. The terminal pin 31 is formed in an L shape extending rearward from the detector main body 30 and then extending rightward. The terminal pin 31 is inserted into and fixed to the power supply substrate 7 . Specifically, the terminal pin 31 is inserted into and fixed to the power supply substrate 7 from the left side, and the right end side of the terminal pin 31 is fixed to the power supply substrate 7 . Moreover, the right end side of the terminal pin 31 is soldered and fixed to the power supply substrate 7 . The detector 12 is electrically connected to the power supply board 7 . The terminal pin 31 of this embodiment is a second terminal pin.

When assembling the motor 1, the rotor 4 and the stator 6 are assembled, the driving magnet 3 is arranged on the inner peripheral side of the stator 6, the frame 14 is fixed to the motor case 21, and both ends of the rotating shaft 2 are attached to the bearings 15. , supported by the bearing 16 . After that, the slider 28 is incorporated into the nut member 27 that engages with the feed screw shaft 2a. After that, the guide shaft 11 is fixed to the frame 14 . When fixing the guide shaft 11 to the frame 14, the rear end portion of the guide shaft 11 is press-fitted into the fixed portion 14b from the front side while the rear surface of the outer peripheral direction projecting portion 14f is abutted against a predetermined jig.

After that, the convex portion 7a of the power supply board 7 with the lead wire 24 attached is inserted into the through hole 22c of the bearing holding plate 22, and the left end side of the terminal pin 23 is inserted into the through hole of the power supply board 7. Further, the detector main body 30 is press-fitted into the detector fixing portion 14 d to be fixed, and the right end side of the terminal pin 31 is inserted into the through hole of the power supply board 7 . In this state, the terminal pins 23 and 31 are soldered and fixed to the power supply board 7 .

(Main effects of this form)
As described above, in this embodiment, the bearing holding plate 22 that holds the bearing 16 is provided with the restricting portion 22d that contacts the power supply board 7 from the left side and restricts the movement of the power supply board 7 to the left side. there is That is, in this embodiment, the bearing holding plate 22 that holds the bearing 16 is used to restrict the movement of the power supply board 7 to the left in the direction in which the four terminal pins 23 extend. Therefore, in this embodiment, there is no need to provide a dedicated member for restricting the movement of the power supply substrate 7 in the direction in which the four terminal pins 23 extend. Therefore, in this embodiment, it is possible to reduce the number of parts of the motor 1 even though it is possible to restrict the movement of the power supply substrate 7 in the direction in which the four terminal pins 23 extend.

In this embodiment, the restricting portion 22 d is in contact with the convex portion 7 a of the power supply substrate 7 that protrudes toward the outer peripheral side of the power supply substrate 7 . Therefore, in this embodiment, it is possible to prevent the restricting portion 22d from coming into contact with the portion of the power feeding substrate 7 where the wiring pattern is formed. Further, in this embodiment, the portion of the bearing holding plate 22 that is arranged on the left side of the through hole 22c serves as a restricting portion 22d, and both sides of the restricting portion 22d in the vertical direction are connected to the right portions of the protruding portions 22b. . Therefore, in this embodiment, it is possible to ensure the strength of the restricting portion 22d.

In this embodiment, the bearing holding plate 22 is fixed to the rear end surface of the motor case 21 . Further, in this embodiment, the detector main body 30 is fixed to the frame 14 fixed to the front end surface of the motor case 21, and the terminal pin 31 protruding from the detector main body 30 is inserted into the power supply board 7 from the left side and fixed. ing. Therefore, in this embodiment, the restricting portion 22d of the bearing holding plate 22 restricts the leftward movement of the power supply substrate 7 on the rear end side of the power supply substrate 7. It becomes possible to restrict the leftward movement of the power supply substrate 7 on the front end side of the substrate 7 . Therefore, in this embodiment, it is possible to effectively restrict the movement of the power supply substrate 7 in the direction in which the four terminal pins 23 extend.

In this embodiment, a plurality of support pins 20b that can come into contact with the right surface of the power supply substrate 7 are formed on the terminal block 20a. Therefore, in this embodiment, it is possible to restrict the rightward movement of the power supply substrate 7 by using the plurality of support pins 20b formed on the terminal block 20a.

In this embodiment, the outer peripheral surface of the motor case 21 has a circular shape when viewed from the front-rear direction. Further, in this embodiment, the outer peripheral surface of the contact portion 22a arranged along the outer peripheral surface of the motor case 21 has an arc shape when viewed from the front-rear direction. Therefore, in this embodiment, it becomes easy to fix a part of the outer peripheral surface of the contact portion 22a arranged along the outer peripheral surface of the motor case 21 to the motor case 21 by laser welding.

In this embodiment, the outer peripheral surface of the motor case 21 has a circular shape when viewed from the front-rear direction. Further, in the present embodiment, the arc portion 14e, which is a part of the outer peripheral surface of the fixed portion 14b arranged along the outer peripheral surface of the motor case 21 when viewed from the front-rear direction, has an arc shape. Therefore, in this embodiment, it becomes easy to fix a part of the fixed portion 14b arranged along the outer peripheral surface of the motor case 21 to the motor case 21 by laser welding.

In this embodiment, the four corner portions of the fixed portion 14b when viewed in the front-rear direction are formed as outer peripheral direction projecting portions 14f. In addition, in this embodiment, when the guide shaft 11 is fixed to the frame 14, the rear end portion of the guide shaft 11 is attached to the fixed portion 14b while the rear surface of the outer peripheral direction projecting portion 14f is abutted against a predetermined jig. It is pressed in from the front. Therefore, in this embodiment, it is possible for the outer peripheral direction projecting portion 14f to receive the pressure force when the rear end portion of the guide shaft 11 is press-fitted from the front side into the fixed portion 14b fixed to the front end surface of the motor case 21. become.

Particularly in this embodiment, since the four corner portions of the fixed portion 14b when viewed from the front-rear direction are formed as the outer peripheral direction protruding portions 14f, the press force when the guide shaft 11 is press-fitted into the fixed portion 14b is It can be received by four outer peripheral direction projecting portions 14f formed at the four corners of the portion 14b. Therefore, in this embodiment, the pressing force when the rear end portion of the guide shaft 11 is press-fitted from the front side into the fixed portion 14b fixed to the front end surface of the motor case 21 can be reliably received by the outer peripheral direction projecting portion 14f. becomes possible. As a result, in this embodiment, deformation of the motor case 21 can be prevented even when the guide shaft 11 is press-fitted into the fixed portion 14b that is fixed to the front end surface of the motor case 21.

(Example of modification of bearing retaining plate)
FIG. 8 is a schematic diagram for explaining the structure of a bearing holding plate 22 according to another embodiment of the invention.

In the embodiment described above, instead of the through hole 22c, for example, as shown in FIG. . In this case, the convex portion 7a of the feeding substrate 7 is inserted into the concave portion 22f. A portion of the bearing holding plate 22 located on the left side of the recessed portion 22f serves as a restricting portion 22d that contacts the power supply board 7 from the left side and restricts movement of the power supply board 7 to the left side.

(Example of modification of bearing holding plate and power supply board)
FIG. 9 is a schematic diagram for explaining the configuration of a bearing holding plate 22 and a power supply substrate 9 according to another embodiment of the invention.

In the embodiment described above, the through hole 22c may not be formed in the bearing holding plate 22. In this case, for example, as shown in FIG. 9A, a restricting portion 22d extending forward from the left end of the protruding portion 22b is formed on the bearing holding plate 22, and the restricting portion 22d extends from the left side. It is in contact with the power supply board 7 and restricts the movement of the power supply board 7 to the left. In this case, the rear end surface of the power supply board 7 is arranged on the front side of the front surface of the bearing holding plate 22 . Further, in this case, the power supply substrate 7 may have the convex portion 7a formed thereon, or may not have the convex portion 7a formed thereon.

Further, in the case where the bearing holding plate 22 is formed with a restricting portion 22d extending forward from the left end of the projecting portion 22b, as shown in FIG. An extending substrate engaging portion 22g may be formed in the bearing holding plate 22. As shown in FIG. In this case, the feed substrate 7 is formed with a through hole 7b into which the substrate engaging portion 22g is inserted. Further, when the bearing holding plate 22 is formed with the restricting portion 22d extending forward from the left end of the projecting portion 22b, the left end of the projecting portion 22b is arranged as shown in FIG. 9(C). A through-hole 7 c may be formed in the power supply substrate 7 . In this case, the rear end surface of the power supply substrate 7 is arranged behind the rear surface of the bearing holding plate 22 .

(Other embodiments)
The embodiment described above is an example of the preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention.

In the embodiment described above, the vertical width of the through hole 22c is substantially equal to the vertical width of the projection 7a, and the bearing holding plate 22 restricts the vertical movement of the power supply board 7. Also good. Further, in the above-described embodiment, the front end of the convex portion 7a and the front surface of the bearing holding plate 22 are arranged at substantially the same position in the front-rear direction, and the bearing holding plate 22 prevents the feed substrate 7 from moving rearward. It may be regulated.

In the embodiment described above, even if the power supply board 7 and the detector 12 are arranged such that the terminal pin 31 is inserted into the power supply board 7 from the right side and the left end side of the terminal pin 31 is fixed to the power supply board 7 good. Moreover, in the form mentioned above, the motor 1 does not need to be equipped with the detector 12. FIG. In this case, the frame 14 may be provided with a restriction portion that restricts the leftward movement of the power supply board 7 on the front end side of the power supply board 7 . Moreover, in the above-described embodiment, the fixed portion 14b may have a rectangular shape when viewed from the front-rear direction. Even in this case, the four corner portions of the fixed portion 14b when viewed in the front-rear direction project further toward the outer periphery of the motor case 21 than the outer peripheral surface of the motor case 21 when viewed in the front-rear direction. It becomes the part 14f.

In the embodiment described above, a part of the rotary shaft 2 is the feed screw shaft 2a, but the feed screw shaft 2a formed separately from the rotary shaft 2 may be fixed to the rotary shaft 2. Further, in the embodiment described above, the rotary shaft 2 may not be formed with the feed screw shaft 2a. In this case, the motor 1 does not have the movable body 8 and the guide shaft 11 . Also, in this case, the motor 1 does not have to be provided with the frame 14 . Furthermore, in the embodiment described above, the motor 1 may be a motor other than a stepping motor.

REFERENCE SIGNS LIST 1 motor 2a feed screw shaft 3 drive magnet 4 rotor 5 drive coil 6 stator 7 power supply substrate 7a convex portion 8 movable body 11 guide shaft 12 detector 14 frame 14a bearing holding portion 14b fixed portion 14c connection portion 14f outer peripheral direction Projection 15 Bearing (output side bearing)
16 bearing 20a terminal block 20b support pin 21 motor case 22 bearing holding plate 22a contact portion 22b projecting portion 22c through hole 22d regulation portion 23 terminal pin 30 detector body 31 terminal pin (second terminal pin)
X Axial direction of feed screw shaft, Axial direction of rotor, Thickness direction of bearing retaining plate X1 Output side X2 Anti-output side Y2 First direction

Claims (11)

A rotor having a driving magnet, a stator having a driving coil arranged on the outer peripheral side of the driving magnet, and a flat plate-shaped power supply substrate to which the driving coil is electrically connected,
The stator includes a motor case in which the drive coil is housed, a bearing holding plate that holds a bearing that rotatably supports the rotor and is fixed to the motor case, and an electric motor at the end of the drive coil. a plurality of terminal pins that are physically connected and have at least tip portions disposed outside the motor case,
the plurality of terminal pins extending in the same direction toward the outer periphery of the motor case,
Assuming that the direction in which the plurality of terminal pins extend toward the outer peripheral side of the motor case is defined as a first direction,
The power supply board is arranged outside the motor case and fixed to the first direction side of the plurality of terminal pins, which is the tip side of the plurality of terminal pins,
The motor according to claim 1, wherein the bearing holding plate is formed with a restricting portion that contacts the power supply substrate from the first direction side and restricts movement of the power supply substrate in the first direction. The power supply substrate is formed with a convex portion projecting toward the outer peripheral side of the power supply substrate formed in a flat plate shape,
2. The motor according to claim 1, wherein the restricting portion is in contact with the convex portion from the first direction side. The bearing holding plate is formed in a flat plate shape,
The bearing holding plate is formed with a through hole that penetrates the bearing holding plate in the thickness direction of the bearing holding plate and into which the projection is inserted,
3. The motor according to claim 2, wherein a portion of the bearing holding plate disposed on the first direction side of the through hole serves as the restricting portion. A movable body that engages with the feed screw shaft of the rotor and moves linearly in the axial direction of the feed screw shaft when the feed screw shaft rotates, and a position of the movable body in the axial direction of the feed screw shaft. A detector for detecting and a frame fixed to the motor case,
the axial direction of the rotor, which is the axial direction of the feed screw shaft, is orthogonal to the first direction;
Assuming that one side of the rotor in the axial direction is the output side and the other side of the rotor in the axial direction is the counter-output side,
The movable body is arranged on the output side of the motor case,
The frame holds an output-side bearing that rotatably supports the output-side end of the feed screw and is fixed to the output-side end face of the motor case,
The bearing holding plate is fixed to the end surface of the motor case on the opposite side of the output,
The detector comprises a detector body fixed to the frame and a second terminal pin protruding from the detector body,
4. The motor according to any one of claims 1 to 3, wherein the second terminal pin is inserted into and fixed to the power supply substrate. The stator includes a terminal block to which base ends of the plurality of terminal pins are fixed,
5. The terminal block according to any one of claims 1 to 4, wherein a plurality of support pins are formed in contact with a surface of the power supply board opposite to the surface facing the first direction. motor as described. The bearing holding plate includes a contact portion that contacts one end surface of the rotor in the axial direction of the motor case, and a projecting portion that projects from the contact portion in the first direction,
At least part of the outer peripheral surface of the contact portion is arranged along the outer peripheral surface of the motor case when viewed from the axial direction of the rotor,
6. The motor according to any one of claims 1 to 5, wherein the restricting portion is formed on the projecting portion. The shape of the outer peripheral surface of the motor case when viewed from the axial direction of the rotor is circular,
3. The shape of at least a part of the outer peripheral surface of the contact portion arranged along the outer peripheral surface of the motor case when viewed from the axial direction of the rotor is arcuate. 7. The motor according to 6. a movable body that engages with the feed screw shaft of the rotor and moves linearly in the axial direction of the feed screw shaft when the feed screw shaft rotates; and guides the movable body in the axial direction of the feed screw shaft. comprising a guide shaft and a frame fixed to the motor case,
the axial direction of the rotor, which is the axial direction of the feed screw shaft, is orthogonal to the first direction;
Assuming that one side of the rotor in the axial direction is the output side and the other side of the rotor in the axial direction is the counter-output side,
The movable body is arranged on the output side of the motor case,
The frame includes a flat plate-shaped bearing holding portion that holds an output-side bearing that rotatably supports the output-side end of the feed screw, and a flat plate-shaped fixing portion that is fixed to the output-side end surface of the motor case. and a flat connecting portion that connects the bearing holding portion and the fixed portion,
The bearing holding portion rises in a predetermined direction from the output side end of the connection portion,
The fixed portion rises from the non-output side end of the connection portion in the same direction as the bearing holding portion,
an end of the guide shaft opposite to the output side is press-fitted and fixed to the fixed portion;
8. The method according to any one of claims 1 to 7, wherein the fixed portion has an outer peripheral direction projecting portion that projects further to the outer peripheral side of the motor case than the outer peripheral surface of the motor case when viewed from the axial direction of the rotor. A motor according to any one of the preceding claims. The shape of the outer peripheral surface of the motor case when viewed from the axial direction of the rotor is circular,
The shape of the fixed portion when viewed from the axial direction of the rotor is square or rectangular,
9. The motor according to claim 8, wherein four corner portions of said fixed portion when viewed from the axial direction of said rotor serve as said outer peripheral direction projecting portions. a movable body that engages with the feed screw shaft of the rotor and moves linearly in the axial direction of the feed screw shaft when the feed screw shaft rotates; and a frame that is fixed to the motor case,
the axial direction of the rotor, which is the axial direction of the feed screw shaft, is orthogonal to the first direction;
Assuming that one side of the rotor in the axial direction is the output side and the other side of the rotor in the axial direction is the counter-output side,
The movable body is arranged on the output side of the motor case,
The frame includes a bearing holding portion that holds an output-side bearing that rotatably supports the output-side end portion of the feed screw, a fixed portion that is fixed to the output-side end face of the motor case, and the bearing holding portion. and a connecting portion that connects the portion and the fixed portion,
10. The motor case according to any one of claims 1 to 9, wherein at least part of the outer peripheral surface of the fixed portion is arranged along the outer peripheral surface of the motor case when viewed from the axial direction of the rotor. motor described in . The shape of the outer peripheral surface of the motor case when viewed from the axial direction of the rotor is circular,
The shape of at least a part of the outer peripheral surface of the fixed portion arranged along the outer peripheral surface of the motor case when viewed from the axial direction of the rotor is arcuate. 11. The motor according to item 10.

Images