KR20050025915A - Motor holding arrangement and motor actuator having the same - Google Patents

Abstract

A motor support apparatus and a motor actuator having the same are provided to effectively limit the rotation of a motor housing caused due to a reactional force applied during operating or braking a motor by preventing the motor housing from rotating around an axis direction of the motor. A cylindrical holding bump(10b) is formed to be integrated with an outer end surface of an end frame. The cylindrical holding bump(10b) is spaced away from a center of the end frame. The holding bump(10b) is protruded in a direction parallel to a rotational axis of a motor(3). The holding bump(10b) is parallel to a magnetic pole center line of a permanent magnets. Two motor holding portions(16,17) are formed at longitudinal ends of a receiving recess(3a) in an inner surface of a case portion(2a) to support the motor(3). The motor holding portions(16,17) are protruded toward an interior of the case portion(2a). A holding groove is formed in the motor holding portion(16). The holding bump(10b) is engaged to the holding groove. The holding groove limits rotation of the holding bump(10b) around the rotational axis and allows the holding bump(10b) to move to be perpendicular to the rotational axis.

Description

Motor support device and motor actuator provided with the same {MOTOR HOLDING ARRANGEMENT AND MOTOR ACTUATOR HAVING THE SAME}

The present invention relates to a motor support device and a motor actuator having the same.

When the motor is started or stopped, torque is applied to the rotor. When torque is applied to the rotor, a reaction force is generated. This reaction forces torque the stator and the motor housing in opposite directions. Accordingly, the motor housing receives the torque generated by the reaction force and tries to rotate around the rotation axis of the motor. Accordingly, the motor housing needs to have a motor support device for restricting the rotation of the motor housing about the rotational axis by this reaction force.

In general, the motor support device provided in the motor actuator has a power supply made of a metal piece. The power supply supports the motor housing such that a terminal of the motor provided in the motor housing is clamped by the power supply to limit rotation of the motor housing. Such a motor support device has been proposed, for example, in Japanese Patent Laid-Open No. 8-70553.

Since each power supply is made of metal pieces, the power supply does not have sufficient strength to limit the rotation of the motor housing by the reaction force. Therefore, the rotation of the motor housing by the reaction force has a problem that can not be sufficiently limited.

In addition, when the terminals of the motor are bent to have a flat shape, there is a problem that it is difficult to use the terminals to support the motor housing. In this case, a separate motor support device needs to be provided.

Accordingly, the present invention has been proposed to solve the above problems, and to provide a motor support device capable of sufficiently restricting the rotation of the motor housing due to the reaction force applied when the motor is operating or when the motor is stopped. do.

In addition, another object of the present invention is to provide a motor actuator having the motor support device.

In order to achieve the objects of the present invention, the present invention provides a motor support device comprising a motor and one or more supports. The motor includes a motor housing and a stator. The stator is rotatably received in the motor housing. The one or more supports support the motor to allow movement of the motor housing in a predetermined direction, i.e., a direction orthogonal to the rotation axis of the motor, while restricting the rotation of the motor housing about the rotational axis of the motor.

Furthermore, in order to achieve the objects of the present invention, the present invention provides a motor actuator comprising a motor and a casing. The motor includes a motor housing and a stator. The stator is rotatably received in the motor housing. The casing receives the motor and has one or more supports. The one or more supports support the motor to permit movement of the motor housing in a predetermined direction, i.e., orthogonal to the axis of rotation of the motor, while restricting the rotation of the motor housing about the axial direction of the motor.

The invention will be better understood from the following detailed description, the appended claims and the accompanying drawings, together with the added objects, features and advantages thereof.

An embodiment of the present invention implemented in a vehicle air conditioner will be described with reference to the accompanying drawings.

The motor actuator 1 of the embodiment shown in Fig. 1 is provided in each of various doors of the vehicle air conditioner, such as an inlet port switching door, a temperature control door and an exhaust port switching door for opening and closing it.

As shown in Fig. 1, the motor actuator 1 includes a casing 2, a motor 3, a first reduction gear 5, a second reduction gear 6, a third reduction gear 7 and a conductive unit. (conducting unit) (8). The first reduction gear 5, the second reduction gear 6, and the third reduction gear 7 form a speed reducing mechanism.

As shown in Figs. 2A and 2B, the casing 2 is made of resin and includes a case portion (first casing portion) 2a and a cover portion (second casing portion) 2b. The first casing portion 2a is adapted to receive the respective elements, and the second casing portion 2b covers the opening of the first casing portion 2a. It fits in the opening part of 2a). An accommodation groove 3a is provided in a base of the first casing part 2a for accommodating the motor 3. As shown in Figs. 3A and 3B, the motor 3 has a motor housing including a cup-shaped yoke housing 9 and an end frame 10. Figs. The end frame 10 is made of a resin and covers the opening of the yoke housing 9. On the inner circumferential surface of the yoke housing 9, two arcuate permanent magnets (two magnetic poles) 11 are fixed to face in a diagonal direction. A rotor R is rotatably received in the radially inner side of the permanent magnets 11. A bearing portion 9a is integrally formed on the bottom of the yoke housing 9 and protrudes outward in the axial direction. A bearing (not shown) is accommodated in the bearing portion 9a to rotatably support the rotating shaft of the rotor R. A receiving through hole (not shown) penetrates through the center of the bearing portion 9a. The rotating shaft of the rotor (R) protrudes out of the yoke housing (9) through the receiving through hole of the bearing portion (9a). The worm 12 is connected to the protrusion of the rotating shaft of the rotor (R) which is integrally rotated with the rotating shaft. In this embodiment, a rubber ring (elastic member) 13a is fitted to the outer circumferential surface of the bearing portion 9a.

In the center of the end frame, the bearing portion 10a is integrally formed to protrude radially outward. A bearing (not shown) supported by the rotating shaft of the rotor R is accommodated in the bearing portion 10a. In this embodiment, the rubber ring (elastic member) 13b is fitted to the outer circumferential surface of the bearing portion 10a. The end frame 10 includes two motor terminals 14 protruding radially outward. The motor terminals 14 are bent in a direction away from the bottom of the second casing portion 2a.

In addition, as shown in Figure 3a, the cylindrical support protrusion (first coupling portion) 10b is integrally formed on the outer end surface of the end frame 10 at a position spaced apart from the center of the end frame 10. do. The support protrusion 10b protrudes in a direction parallel to the rotation axis A of the motor 3. In addition, as shown in FIG. 3B, the support protrusion 10b is orthogonal to the rotation axis A of the motor 3, and is a virtual line parallel to the magnetic pole center line 15 of the permanent magnets (stimulation) 11. Located on the line. The magnetic pole center line 15 extends through the center of each of the two magnetic poles. In FIG. 3B, these imaginary lines overlap each other in the axial direction of the motor 3, and thus coincide with the magnetic pole center line 15. FIG.

On the inner surface of the first casing portion 2a for supporting the motor 3, two motor support portions 16 and 17 are formed at the longitudinal ends of the accommodation grooves 3a, respectively. The motor support parts 16 and 17 protrude into the first casing part 2a.

A support groove (second coupling part) 18 to which the first coupling part 10 is coupled in the motor support part 16 supporting the motor 3 on the end frame 10 side of the motor 3. Is formed. The support groove 18 is notched or recessed at a position on an imaginary line orthogonal to the rotation axis A of the motor 3 and parallel to the magnetic pole center line 15 of the permanent magnet 11. Is formed. The support groove 18 is formed as a groove in a direction orthogonal to the plane including the rotation axis A of the motor 3. In this embodiment, the plane comprising the rotation axis A of the motor 3 extends along the rotation axis A and is orthogonal to the plane of Fig. 3A. The support groove 18 formed in the above manner restricts the rotation of the support protrusion 10b about the rotation axis A, and moves the support protrusion 10b in a direction orthogonal to the rotation axis A. FIG. Allow. That is, the support groove 18 is coupled to the support protrusion 10b, so that the support groove 18 limits the rotation of the support protrusion 10b around the rotation axis A of the motor 3, The support protrusion 10b is allowed to move in the direction orthogonal to the rotation axis A of the motor 3. In this embodiment, the direction orthogonal to the rotation axis A coincides with the direction in which the second casing portion 2b is installed in the first casing portion 2a.

In FIG. 3B, the width of the support groove 18 measured in the left and right directions is generally equal to the outer diameter of the support protrusion 10b. The length of the support groove 18 measured in the orthogonal direction in Fig. 3b is longer than the outer diameter of the support protrusion 10b. The support protrusion 10b coupled to the support groove 18 is disposed at or around the longitudinal center (vertical center in FIG. 3B) of the support groove 18. An arcuate support groove 16a is formed in the support 16 along the ring 13b at the opening 18a of the support groove 18.

As shown in FIG. 4, each inner edge (inner surface) 18b extending in the longitudinal direction of the support groove 18 faces the inner edge 18b in a direction parallel to the magnetic pole center line 15. In this case, it has an arcuate shape that is convex toward the other of the inner edge 18b. Therefore, the connection between each inner edge 18b and the support protrusion 10b is made in point contact.

As shown in Fig. 3A, a support groove 17a is formed in the motor support 17 for supporting the motor 3 at the bottom of the yoke housing 9. The support groove 17a is similar to the support groove 16a and has an arcuate shape curved along the ring 13a.

An accommodation groove 3b is formed in the second casing portion 2b. The accommodating groove 3b cooperates with the accommodating groove 3a for accommodating the motor 3. Two motor support portions 19 and 20 are formed at the longitudinal ends of the respective receiving grooves 3b to protrude toward the inside of the second casing portion 2b. The motor supports 19, 20 cooperate with the motor supports 16, 17 to support the motor 3.

Support grooves 19a and 20a are formed in the motor support units 19 and 20, respectively. Each of the support grooves 19a and 20a is similar to the support groove 16a and has an arcuate shape curved along the corresponding rings 13a and 13b.

Thus, the motor 3 is supported by the motor supports 16, 17, 19, 20 through the rings 13a, 13b. In this way, the motor 3 (motor housing) is not directly connected to the motor support 16, 17, 19, 20, and the rings 13a, 13b absorb or attenuate vibration. Thus, the vibration is reduced from the motor 3 to the casing 2. In addition, in the motor 3, the support protrusion 10b provided in the motor housing is accommodated in the support groove 18 formed in the motor support 16. The support protrusion 10b is coupled to the support groove 18 in the rotational direction of the motor 3.

As shown in Figs. 1, 2A and 2B, the first casing portion 2a is supported to support the first reduction gear 5, the second reduction gear 6 and the third reduction gear 7, respectively. Bearings 21a, 22a, 23 are provided.

In addition, bearings 21b and 22b cooperate with the bearings 21 and 22a and support the first reduction gear 5 and the second reduction gear 6, respectively, in the second casing portion 2b. Is provided. In addition, a bearing hole 24 is provided in the second casing portion 2b to cooperate with the bearing 23 and to support the second reduction gear 7.

The first reduction gear 5 meshes with the worm 12 connected to the rotational axis of the motor 3 so as to rotate integrally therewith. The second reduction gear 6 is engaged with the first reduction gear 6, and the third reduction gear 7 is engaged with the second reduction gear 6. More specifically, the first reduction gear 5 includes a large diameter gear 5a, a small diameter gear 5b, and a support shaft 5c which are integrally formed. The first reduction gear 5 is rotatably supported by the bearings 21a and 21b. Similarly, the second reduction gear 6 includes a large-diameter gear 6a, a small-diameter gear 6b and a support shaft 6c which are integrally formed. The second reduction gear 6 is rotatably supported by the bearings 22a and 22b. The output shaft 7a is integrally formed on the third reduction gear 7. One end of the output shaft 7a of the third reduction gear 7 is supported by the bearing 23, and the other end of the output shaft 7a is received through the bearing hole 24. In this way, the third reduction gear 7 is rotatably supported. In order to limit the free rotation of the output shaft 7a, an output portion 7b is formed at the end of the output shaft 7a protruding from the bearing hole 24. The output portion 7b has a cross-sectional area of D shape, and its flat surface extends in the axial direction.

Thus, the rotation of the worm 12 driven by the motor 3 is transferred to the large gear 5a of the first reduction gear 5 and then the first reduction gear 5. The small-diameter gear 5b is transmitted to the large-diameter gear 6a of the second reduction gear 6. Thereafter, the rotation is transmitted from the small-diameter gear 6b of the second reduction gear 6 to the third reduction gear 7 and output from the output 7b of the output shaft 7a.

The conductive unit 8 accommodated in the first casing portion 2a controls the operation of the motor actuator 1. The conductive unit 8 includes a power supply 25. The power supply terminal 26 of the power supply unit 25 is coupled to each of the motor terminals 14 to supply power to the motor 3.

Next, the operation of the motor actuator 1 of the present embodiment will be described.

When the motor 3 is operated, torque is applied in the direction of rotating the rotor (R). Then, a torque applied in a direction opposite to the rotational direction of the rotor R is applied to the motor housing (for example, the yoke housing 9 and the end frame) of the motor 3 around the rotation axis A. 10) is generated as a reaction force to the stator (yoke housing 9 and permanent magnet 11) to rotate. However, the support protrusion 10b is coupled to the support groove which restricts its rotation, so that the rotation of the motor housing of the motor 3 (for example, the yoke housing 9 and the end frame 10) is advantageous. Are limited.

The same thing happens when the motor 3 stops.

Next, the advantages of the present embodiment will be described.

(1) The support protrusion 10b is coupled to the support groove 18. Therefore, when the motor 3 is operated or stopped, the motor housing of the motor 3 caused by reaction forces generated in response to the torque applied to the rotor R (for example, the yoke housing) 9) and the end frame 10 may be limited in rotation.

(2) The support groove 18 extends in a direction orthogonal to the surface including the rotation axis A of the motor 3. Therefore, the movement of the motor 3 is permitted in a predetermined direction orthogonal to the plane including the motor 3. This predetermined direction coincides with the installation direction of the motor 3 when the motor 3 is installed in the first casing part 2a, and the second casing part 2b is provided in the first casing part 2a. Coincides with the installation direction. Thus, the motor 3 can be easily assembled to the first casing portion 2a. In addition, during assembly, the motor 3 may be accommodated in the first casing portion 2a by inserting the support protrusion 10b into the support groove 18 so that the motor assembly work can be easily performed.

(3) The support groove 18 is provided on the motor support 16 along an imaginary line perpendicular to the rotation axis A of the motor 3 and parallel to the magnetic pole center line 15. In general, magnetic vibration of the motor 3 is likely to occur in the direction of the magnetic pole center line 15. When the support groove 18 is provided along an imaginary line perpendicular to the axis of rotation A of the motor 3 and parallel to the magnetic pole center line 15, the support protrusion 10b caused by magnetic vibration is present. The vibration direction of the support groove 18 and the direction of extension, the support protrusion 10b may be vibrated in the support groove 18. Therefore, transmission of the magnetic vibration from the support protrusion 10b to the casing 2 through the support groove 18 is limited, and the occurrence of noise caused by the vibration of the casing 2 is limited. May be advantageously limited.

(4) The support protrusion 10b is provided near each connection portion between the motor terminal 14 and the corresponding power supply terminal 26 and is coupled to the support groove 18. Thus, a more accurate connection between the motor terminal 14 and the power supply terminal 26 can stabilize supplying power to the motor 3.

(5) Since both the support protrusion 10b and the support groove 18 are made of resin, a resin-to-resin contact is made between the support protrusion 10b and the support groove 18. Thus, vibration is transmitted from the support protrusion 10b to the support groove 18. However, the support protrusion 10b has a cylindrical shape, and each inner edge 18b contacting the support protrusion 10b has an arc shape. Thus, there is a point contact between the support protrusion 10b and the inner edge 18b, whereby the contact area between them is minimized. Therefore, transmission of vibration from the support protrusion 10b to the casing 2 can be minimized.

(6) The support protrusion 10b is formed integrally with the end frame 10. Therefore, manufacturing is easy.

(7) Since the motor 3 is supported by the motor support portions 16, 17, 19, and 20 through the rings 13a and 13b, the motor 3 (motor housing) is supported by the motor support portion 16. Without direct contact with, 17, 19, 20, the rings 13a, 13b absorb or attenuate vibrations. Thus, transmission of vibration from the motor 3 to the casing 2 is minimized.

(8) Based on the torque generated by the rotation of the motor 3, the support protrusion 18b is formed at a position away from the rotation axis A of the motor 3, so that the motor housing (for example The rotational force causing the rotation of the yoke housing 9 and the end frame 10 can be more easily and efficiently accommodated by the support protrusion 18b. Therefore, the rotation of the motor housing (for example, the yoke housing 9 and the end frame 10) of the motor 3 can be restricted more efficiently.

This embodiment may be modified as follows.

In the above embodiment, the support protrusion 18b is in direct contact with each of the inner edges 18b. Alternatively, a rubber ring provided as a vibration absorbing member or elastic member may be provided around the support protrusion 18b. In this way, the resin material support protrusion 18b is not in direct contact with the resin material inner edge 18b. In addition, the ring provided around the support protrusion 18b absorbs or attenuates vibration, so that vibration transmission from the support protrusion 18b to the casing 2 can be further reduced.

In the above embodiment, the support groove 18 is provided in the motor support portion 16, is orthogonal to the rotation axis A of the motor 3, and along an imaginary line parallel to the magnetic pole center line 15 Is extended. However, the present invention is not limited to this. For example, the support groove 18 is provided along an imaginary line perpendicular to the rotation axis A of the motor 3 and parallel to the magnetic pole center line 15. However, the support groove 18 is formed to allow movement of the motor 3 in a direction parallel to the magnetic pole center line 15.

In the above embodiment, one support protrusion 10b and one support groove 18 are provided. Alternatively, two or more support protrusions and two or more support grooves may be provided. In this way, the motor housing of the motor 3 can be limited in rotation more efficiently when the motor 3 is operated and stopped.

In the above embodiment, the support protrusion 10b is provided in the end frame 10. Alternatively, the support protrusion 10b may be provided on the bottom surface of the yoke housing 9 and the support groove 18 may be provided at a corresponding position to be coupled to the support protrusion 10b. In this case, advantages similar to those described in paragraph (4) above can be obtained.

In the above embodiment, the support groove 18 is provided in the motor support 16. Alternatively, the support groove 18 may be provided in any one of the motor support portions 17, 19, 20 other than the motor support portion 16, and the support protrusion 10b may be provided in the support groove 18. To be coupled to

In the above embodiment, each inner edge 18b is arcuate. Alternatively, each inner edge 18b may, for example, have a triangular shape or a planar shape. If each inner edge 18b is triangular in shape, advantages similar to those described for the arcuate inner edge 18b can be obtained. When each inner edge 18b has a planar shape, the cylindrical support protrusion 10b is in linear contact with the planar inner edge 18b. Thus, advantages similar to those described for the arcuate inner edge 18b can be obtained.

In the above embodiment, an arcuate permanent magnet 11 is used. Alternatively, a cylindrical permanent magnet 11 with two magnetic poles may be used. In addition, each permanent magnet 11 is made of a ferrite magnet or a rubber magnet. When the rubber magnet is used as the permanent magnet 11, two magnetic poles may be provided in one body, as shown in FIG. In Fig. 5, a rubber magnet 11 including two magnetic poles is provided in one plate. The rubber magnet 11 is then forcibly bent along the inner circumferential surface of the yoke housing 9, and the ends of the rubber magnet 11 are opposed to each other in the dotted line 11a of FIG. Since the rubber magnet 11 has elasticity, the permanent magnet 11 can be fixed to the inner circumferential surface of the yoke housing 9 through its elastic deformation without using a bonding method or the like. Therefore, the manufacturing cost of the motor 3 can be reduced compared to the case of using a ferrite magnet as the permanent magnet (11).

In addition, because of the elasticity of the rubber magnet, the vibration of the motor 3 can be limited while the motor 3 is being rotated.

In the above embodiment, the support protrusion (10b) is made of a first coupling portion of the end frame 10, the support groove 18 is made of a second coupling portion of the motor support (16). Alternatively, a support groove may be formed in the end frame 10 with a first coupling part extending in the radial direction of the motor 3, and a protrusion may be provided in the motor support part 16 with a second coupling part.

In the above embodiment, the support protrusion 10b is engaged with the support groove 18 which limits the rotation of the motor housing (eg, the yoke housing 9 and the end frame 10) of the motor 3. The movement of the motor 3 in a predetermined direction orthogonal to the rotation axis A of the motor 3 is allowed. However, the present invention is not limited to this. For example, the bearing part of the end frame 10 having a cylindrical shape may be supported by the motor support part having a groove having a shape corresponding to the shape of the bearing part of the end frame 10. In this case, the motor 3 is allowed to move relative to the motor support in a predetermined direction orthogonal to the axis of rotation A thereof. With this structure, when the bearing portion is coupled to the groove of the motor support portion, the motor housing (eg, the yoke housing 9 and the end frame 10) of the motor 3 around the rotation axis A is formed. Rotation can be limited. Therefore, the rotation of the motor housing of the motor 3 caused by the reaction force generated when the motor 3 is activated or stopped can be effectively limited.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the technical field of the present invention without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

The motor support device and the motor actuator having the same of the present invention as described above have the effect of sufficiently limiting the rotation of the motor housing due to the reaction force applied when the motor is operating or when the motor is stopped.

1 is a schematic front view showing a motor actuator according to an embodiment of the present invention.

Figure 2a is a front view showing a cover portion of the casing of the motor housing.

Figure 2b is a front view showing the casing portion of the casing.

Figure 3a is a schematic cross-sectional view showing a motor support device of the motor actuator.

Figure 3b is a partial front view showing a motor support device

4 is a cross-sectional view taken along line IV-IV of FIG. 3B;

Fig. 5 is a partial front view showing the motor support device of the modification.

* Description of the symbols for the main parts of the drawings *

1: motor actuator 3: motor

10: end frame 10b: support protrusion

11: permanent magnet 14: motor terminal

15: magnetic pole center line 16, 17: motor support

18: support groove 18c: opening

26: power supply terminal

Claims (20)

A motor having a motor housing and a rotor rotatably received in the motor housing; And At least one support for supporting the motor to allow movement in a direction orthogonal to the axial direction of the motor while restricting rotation of the motor housing about the axial direction of the motor Motor support device comprising a. The method of claim 1, The motor housing supports one or more permanent magnets having two magnetic poles facing diagonally along an inner circumferential surface of the motor housing, The one or more supports allow movement of the motor housing in a direction parallel to a pole center line extending through each center of the two poles. Motor support device. The method of claim 2, The one or more permanent magnets include one or more rubber magnets Motor support device. The method of claim 3, The at least one rubber magnet includes one rubber magnet having two magnetic poles Motor support device. The method of claim 1, The first coupling portion is provided on the outer end surface of the motor housing, A second coupling coupled to the first coupling portion to one of the one or more supports to restrict the motor housing from rotating around the axial direction of the motor while allowing movement in a direction orthogonal to the axial direction of the motor Wealthy Motor support device. The method of claim 5, The first coupling portion is a projection, The second coupling portion is a groove accommodated in one of the at least one support in a direction orthogonal to the axial direction of the motor. Motor support device. The method of claim 5, The motor housing supports one or more permanent magnets having two magnetic poles facing diagonally along the inner circumferential surface thereof, The first coupling portion is orthogonal to the axial direction of the motor and is positioned on an imaginary line parallel to the pole center line extending through each center of the two poles. Motor support device. The method of claim 5, The motor housing supports one or more permanent magnets having two magnetic poles facing diagonally along the inner circumferential surface thereof, The second coupling portion allows movement of the motor housing in a direction parallel to the pole center line extending through each center of the two poles. Motor support device. The method of claim 5, The outer cross section of the motor housing includes a plurality of motor terminals in contact with a plurality of power supply terminals for supplying power to the motor. Motor support device. The method of claim 5, The first coupling portion is radially spaced apart from the axial direction of the motor Motor support device. The method of claim 5, The connection between the first coupling portion and the second coupling portion is made of one of contact contact and line contact Motor support device. The method of claim 1, Further comprising at least one elastic member respectively supported between the motor housing and at least one of the at least one support portion Motor support device. A motor having a motor housing and a stator rotatably received in the motor housing; And One or more supports for receiving the motor and restricting the motor housing from rotating around the axial direction of the motor, while supporting the motor to allow movement in a direction orthogonal to the axial direction of the motor. Casing Motor actuator comprising a. The method of claim 13, It further includes a reduction mechanism for reducing the axial speed of the motor Motor actuator. The method of claim 13, The first coupling portion is provided on the outer end surface of the motor housing, A second coupled to the first engagement portion to allow movement of the motor housing around the axial direction of the motor to one of the one or more supports, while allowing movement in a direction orthogonal to the axial direction of the motor With coupling Motor actuator. The method of claim 13, The motor housing supports one or more permanent magnets having two magnetic poles facing diagonally along the inner circumferential surface thereof, The one or more supports allow movement of the motor housing in a direction parallel to a pole center line extending through each center of the two poles. Motor actuator. The method of claim 16, The one or more permanent magnets include one or more rubber magnets Motor actuator. The method of claim 17, The at least one rubber magnet includes one rubber magnet having the two magnetic poles. Motor actuator. The method of claim 13, The casing includes a first casing portion and a second casing portion connected to each other. The one or more support portions allow the movement of the motor housing in a direction parallel to the installation direction in which the second casing portion is installed in the first casing portion. Motor actuator. The method of claim 13, Further comprising at least one elastic member respectively supported between the motor housing and at least one of the at least one support portion Motor actuator.