WO2020075595A1

WO2020075595A1 - Motor and fan motor comprising same

Info

Publication number: WO2020075595A1
Application number: PCT/JP2019/038972
Authority: WO
Inventors: 正雄小島
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2018-10-09
Filing date: 2019-10-02
Publication date: 2020-04-16

Abstract

This motor comprises: a shaft extending in a direction of the axis; a bearing that is freely movable in the axial direction and supports the shaft in a rotatable manner about the axis; a rotor having a rotor frame to be mounted to the shaft along the axial direction; a stator positioned to face the outer surface of the rotor with a space therebetween; and a washer positioned between the bearing and the rotor frame in a direction along the bearing. The rotor frame includes a step portion that forms a cavity in a position where the washer faces the rotor frame. The washer is a thin plate in which the center section projects towards the bearing relative to the edge section.

Description

Motor and fan motor including the motor

The present invention relates to a motor and a fan motor including this motor.

2. Description of the Related Art Conventionally, motors used for vehicle-mounted blower or fan motors have abolished the bearings at both ends of the shaft for the purpose of downsizing, and have a predetermined magnetic center of the rotor and magnetic center of the stator in the axial direction of the shaft. Combining with a distance. As a result, between the rotor and the stator, a force that tries to match the magnetic center positions of both in the axial direction, that is, a magnetic restoring force (hereinafter, referred to as "restoring force") is generated. The restoring force acts so that the shaft pushes the thrust plate with the pivot that is the tip of the shaft. The axial direction is the direction in which the axial center included in the shaft extends.

When a device equipped with such a motor is installed in various vehicles, the direction in which gravity acts varies depending on the installation status of the device. However, with the above configuration, even if a difference occurs in the direction in which gravity acts, the positional relationship in the axial direction of the shafts of the rotor and the stator does not change, so a stable motor function can be obtained.

On the other hand, since such a motor utilizes the restoring force, there were the following problems. That is, when a strong impact is applied to the motor, the rotor may jump up in the axial direction. The jumped-up rotor returns to its original position due to the restoring force. At this time, the shaft collides with the thrust plate and a collision noise is generated.

Therefore, conventionally, a technique for suppressing such a collision sound has been proposed (for example, see Patent Document 1). As one example thereof, a motor has been proposed in which a damper ring is provided along with a circumferential groove near the end of the shaft.

However, in a conventional motor provided with a damper ring, the damper ring needs to be properly provided on the shaft. Therefore, the conventional motor has a problem that the structure of the motor becomes complicated and complicated assembling work is required, resulting in a decrease in assembling efficiency. Further, the conventional motor has a problem that the number of parts is increased due to the damper ring.

JP, 2009-254193, A

The present invention has been made to solve such a problem. SUMMARY OF THE INVENTION It is an object of the present invention to provide a motor that has a simple configuration and that suppresses a collision noise due to a jump of a rotor and the like, and a fan motor including the motor.

In order to achieve this object, the motor of the present invention includes a shaft extending in the axial direction, a bearing that is movable in the axial direction and rotatably supports the shaft around the axial center, and a shaft in the axial direction. A rotor having a rotor frame attached to a shaft along the shaft, a stator facing the outer peripheral surface of the rotor with a gap, and a washer positioned between the bearing and the rotor frame in the direction along the bearing. And

The rotor frame includes a recess where the washer faces the rotor frame. The washer is a thin plate whose central portion is convex toward the side where the bearing is located rather than the end portions. The rotor frame may have a stepped portion that forms a depression.

The washer is preferably a convex thin plate that satisfies the following conditions. That is, when the rotor frame moves in the direction along the axis and collides with the bearing through the washer, the bearing pushes the washer toward the recess, and the washer bends into a part of the recess.

With this configuration, the following operational effects can be achieved. That is, when a strong impact is applied to the motor and the rotor frame bounces, the bounced rotor frame tries to return to its original position due to the restoring force. At this time, when the rotor frame collides with the bearing via the washer, the impact can be mitigated by the deformation of the washer due to the deflection.

Furthermore, a step is formed on the rotor frame. In the rotor frame, the recess formed by the step portion expands the movable range in which the washer bends like a spring. As a result, even if the washer has a small deflection width in the initial state, it has a deflection width such that the washer has a movable range up to the recess formed by the step portion, so that the spring effect can be enhanced. Therefore, the motor can be made thin by reducing the deflection width of the spring when assembling the motor. Furthermore, it is possible to effectively suppress the impact sound generated by the collision between the bearing and the rotor frame.

According to the present invention, the recess is formed in the rotor frame, and the washer having the flexure on the side opposite to the recess is arranged from the initial stage between the bearing and the rotor frame. Impact noise can be effectively suppressed.

FIG. 1 is a configuration diagram showing an outline of a motor according to the first embodiment of the present invention. FIG. 2 is a sectional view of the motor according to the first embodiment of the present invention. FIG. 3A is an explanatory diagram illustrating a relationship between the rotor and the stator of the motor according to the first embodiment of the present invention. FIG. 3B is an explanatory diagram illustrating a relationship between the rotor and the stator of the motor according to the first embodiment of the present invention. FIG. 4 is an enlarged view of a main part of the motor according to the first embodiment of the present invention. FIG. 5 is an explanatory diagram showing a positional relationship between the rotor frame and the washer of the motor according to the first embodiment of the present invention. FIG. 6 is an enlarged view of a main part of a motor of a modified example of the invention. FIG. 7 is a configuration diagram showing an outline of the fan motor according to the second embodiment of the present invention. FIG. 8 is a sectional view of a main part of a fan motor according to the second embodiment of the present invention. FIG. 9 is a perspective conceptual diagram when the fan motor according to the second embodiment of the present invention is used for the storage portion. FIG. 10 is a perspective conceptual diagram when the fan motor according to Embodiment 2 of the present invention is used for a seat. FIG. 11A is a top view showing an example of the washer according to the first embodiment of the present invention. FIG. 11B is a sectional view showing an example of the washer according to the first embodiment of the present invention.

Hereinafter, details of the embodiment of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a configuration diagram showing an outline of a motor 10 according to the first embodiment of the present invention. FIG. 2 is a sectional view of motor 10 in accordance with the first exemplary embodiment of the present invention. In the present embodiment, an example of an inner rotor type brushless motor in which a rotor is arranged on the inner peripheral side of a stator will be described as an example.

As shown in FIGS. 1 and 2, a motor 10 includes a case body 11A, a case lid 11B, a stator 15 arranged in the case body 11A, a shaft 19, a metal bearing 16 as a bearing, and a rotor 14. And a thrust plate 18. The motor case 11 is formed by sealing the case body 11A with a case lid 11B.

The motor case 11 is made of electrogalvanized steel sheet. The shaft 19 is made of martensitic stainless steel. The shaft 19 is arranged in the center of the motor case 11. One end of the shaft 19 projects from the case body 11A. The other end of the shaft 19 is supported by the case lid 11B via the thrust plate 18. The metal bearing 16 is a sintered oil-impregnated bearing, and is made of, for example, Fe—Cu—Sn— (C) material. The metal bearing 16 is attached to the shaft outer peripheral surface 19a so that the shaft center 31 of the shaft 19 extends, that is, along the shaft center direction 32. The shaft 19 is supported by the case cylindrical portion 11C of the case body 11A via the metal bearing 16. With such a configuration, the metal bearing 16 supports the shaft 19 movably in the axial direction 32 and rotatably around the axial center 31.

The rotor 14 is attached to the shaft 19 along the axial direction 32 of the shaft 19. The rotor 14 includes a rotor frame 12 and a rotor magnet 13. The rotor frame 12 is made of electrogalvanized steel sheet. The rotor frame 12 holds the rotor magnet 13 by adhesion. The rotor frame 12 generates torque by the magnetic force generated by the rotor magnet 13. The rotor magnet 13 is composed of a rare earth bond magnet and is affected by a magnetic field generated by a stator 15 described later.

As shown in FIG. 2, the rotor frame 12 has a structure including a disk portion 21, a cylindrical portion 22, a step portion 23, and a mounting portion 24. The rotor frame 12 is attached to the shaft 19 by the attachment portion 24. The disk portion 21 extends in the outer peripheral direction from the mounting portion 24 and has an annular shape. The cylindrical portion 22 extends along the axial direction 32 from the outer periphery of the disk portion 21 and has a cylindrical shape. A step portion 23 is formed on the inner peripheral side of the disk portion 21.

In this way, the rotor frame 12 has a cup-like shape with one end open. In the motor 10, a metal bearing 16 which is a bearing is arranged on the open side of the rotor frame 12, and a part of the metal bearing 16 is inserted into a cylindrical hollow portion inside the rotor frame 12.

In the motor 10, a gap is provided between the rotor frame 12 and the metal bearing 16 in the direction along the axis 31 and the washer 30 is arranged in the gap. Here, the step portion 23 included in the rotor frame 12 is formed at a position facing the washer 30.

The stator 15 is arranged to face the outer peripheral surface 14a of the rotor 14 with a gap. The stator 15 includes an iron core 15A and a winding wire 15B wound around the iron core 15A. The stator 15 forms an electromagnet by causing a predetermined current to flow through the winding 15B. By controlling the magnetic field generated by the electromagnet, the rotor 14 rotates around the shaft 19 at a desired rotation speed.

3A and 3B are explanatory diagrams for explaining the relationship between the rotor 14 and the stator 15 of the motor 10 according to the first embodiment of the present invention. The restoring force used by the motor 10 will be described with reference to FIGS. 3A and 3B. FIG. 3A shows a case where no shock is generated on the motor 10, and FIG. 3B shows a case where a shock is generated on the motor 10.

First, as shown in FIG. 3A, in the axial direction 32 in which the shaft 19 extends, between the rotor 14 and the stator 15, the magnetic center MCR of the rotor 14 and the magnetic center MCS of the stator 15 are at a predetermined distance L. It is installed at intervals. At this time, the restoring force F is generated in the rotor 14 in the direction of eliminating the distance L. The restoring force F is indicated by an arrow in the figure. In the axial direction 32 in which the shaft 19 extends, the thrust plate 18 is attached to the motor (10) in the direction in which the restoring force F acts. As shown in FIG. 3A, the shaft 19 pushes the thrust plate 18 downward (direction of restoring force F) by a pivot 19b which is a tip portion of the shaft 19. The thrust plate 18 supports the shaft 19 by means of a pivot 19b which is the tip of the shaft 19. The thrust plate 18 is made of polyetheretherketone (PEEK) or ceramic. Since the thrust plate 18 supports the rotating shaft 19, it is required to have excellent wear resistance.

By the way, when such a motor 10 is installed in an automobile, the following situations may occur. That is, when an impact occurs due to the automobile traveling on a rough road or a step, a strong force Fu equal to or greater than the restoring force F may be applied to the shaft 19 in the direction opposite to the direction in which the restoring force F acts. . That is, as shown in FIG. 3B, the rotor 14 jumps up in the axial direction 32, and a gap Lu is instantaneously generated between the shaft 19 and the thrust plate 18. When the strong force Fu disappears, the shaft 19 will forcibly return to its original position by the restoring force F so as to be in the state shown in FIG. 3A. Thus, when a strong shock is applied to the motor 10, the rotor 14 is shaken in the axial direction 32, and when the rotor 14 returns to the original position, the rotor frame 12 collides with the metal bearing 16 and emits a collision sound. It will be. Conventionally, this collision sound has reached the ears of the passengers, causing the passengers to feel discomfort.

Next, the detailed configuration of the present embodiment for suppressing such collision noise will be described.

FIG. 4 is an enlarged view of a main part of the motor 10 according to the first embodiment of the present invention. FIG. 4 is an enlarged view of the main part AA in FIG. FIG. 5 is an explanatory diagram showing a positional relationship between the rotor frame 12 and the washer 30 included in the motor 10 according to the first embodiment of the present invention, and is a diagram of the rotor frame 12 viewed from the axial direction 32.

As shown in FIG. 4, in the present embodiment, in order to suppress the collision noise between the rotor frame 12 and the metal bearing 16, the washer 30 is arranged between the rotor frame 12 and the metal bearing 16, and the rotor frame 12 is also disposed. A stepped portion 23 is formed in this.

As shown in FIG. 5, when viewed from the axial direction 32, the rotor frame 12 has an annular shape around the shaft 19. Further, the washer 30 also has an annular shape as shown by a broken line. That is, the shaft 19 penetrates the central hole of the washer 30.

On the other hand, as shown in FIG. 4, a gap G is provided between the disc portion 21 included in the rotor frame 12 and the metal bearing 16 in the axial direction 32. The washer 30 is arranged between the gap G, that is, between the disk portion 21 of the rotor frame 12 and the rotor-side tip portion 16a of the metal bearing 16. The washer 30 is movably mounted along the shaft 19 in the gap G, i.e. not attached.

The washer 30 is made of metal, for example. As shown in FIG. 4, the washer 30 is not a flat surface but a thin plate having a convex shape (as an example, a substantially spherical shape having an opening in the central portion) in which the central portion 30a projects toward the bearing 16 side. You can In other words, the washer 30 has a three-dimensional shape in which the central portion 30a is a thin plate that is convex toward the side where the metal bearing 16 is located rather than the end portion 30b. As a result, the washer 30 has a stronger spring characteristic with respect to the displacement in the axial direction 32 and is assembled so as to be convex on the bearing side where collision noise is a problem.

In this embodiment, the washer 30 is arranged between the rotor frame 12 and the metal bearing 16. Therefore, as shown in FIG. 3B, even if the rotor frame 12 collides with the metal bearing 16 when the rotor 14 bounces up and then returns to its original position due to an impact, the washer 30 having a spring characteristic has a buffering effect. The impact noise between the rotor frame 12 and the metal bearing 16 is reduced.

FIG. 11A shows a top view of an example of the washer 30 according to the first embodiment of the present invention. FIG. 11B shows a sectional view of an example of washer 30 in accordance with the first exemplary embodiment of the present invention.

As shown in FIGS. 11A and 11B, in the present embodiment, the washer 30 has a convex initial shape in order to increase the impact noise mitigation effect. In order to form this shape, the washer 30 is preferably made of metal instead of resin. In this way, the motor 10 can absorb the kinetic energy to a greater extent by the washer deformation when the shaft 19 collides, by making the initial shape of the washer 30 convex. As a result, the kinetic energy at the moment when the collision sound is generated can be minimized.

In the present embodiment, the rotor frame 12 is configured to have the step portion 23. As shown in FIG. 5, when viewed from the axial direction 32, the step portion 23 has an annular shape with a predetermined width from the inner circumference of the rotor frame 12, and is formed on the rotor frame 12 along the outer circumference of the shaft 19. Has been formed. As shown in FIG. 4, the step portion 23 is provided so as to form a recess 23a in the rotor frame 12 at a position where the washer 30 and the rotor frame 12 face each other in the axial direction 32. That is, the step portion 23 is formed so as to have a step in a direction away from the metal bearing 16 from a surface on the surface of the disk portion 21 which is in contact with the metal bearing 16, and a recess 23 a from the step to the shaft 19. Is formed. The outer diameter of the step portion 23 is smaller than the outer diameter of the washer 30. That is, the washer 30 does not fall into the step portion 23.

Such a step portion 23 is formed on the rotor frame 12. Therefore, when the rotor frame 12 collides with the metal bearing 16 via the washer 30, the recess 23 a formed by the step portion 23 causes the inner peripheral side of the washer 30 to bend. By such an action of the step portion 23 and the washer 30, the washer 30 can have a spring effect. As a result, the impact of the collision between the rotor frame 12 and the metal bearing 16 can be alleviated and the impact noise can be suppressed.

That is, in the present embodiment, the washer has a three-dimensional shape that is a thin plate having a convex shape (a substantially spherical shape having an opening at the center, for example) with the center protruding toward the bearing side. Therefore, in the initial state, the washer has a deflection on the side opposite to the step portion, thereby further enhancing the spring effect. As a result, it is possible to effectively suppress the impact sound generated by the collision between the metal bearing and the rotor frame.

As described above, the motor 10 according to the present embodiment includes the shaft 19 extending in the direction in which the shaft center 31 extends, that is, the shaft 19 extending in the shaft center direction 32, the shaft 19 being movable in the shaft center direction 32 and having the shaft center 31 as the rotation center. A metal bearing 16 that is a bearing that rotatably supports 19, a rotor 14 that has a rotor frame 12 that is attached to a shaft 19 along an axial direction 32, and an outer peripheral surface 14a of the rotor 14 that opposes with a gap. And the washer 30 located between the metal bearing 16 which is a bearing and the rotor frame 12 in the direction along the axis 31. The rotor frame 12 includes a recess 23a at a position where the washer 30 and the rotor frame 12 face each other. The washer 30 is a thin plate in which the central portion 30a is more convex than the end portion 30b toward the side where the metal bearing 16 that is a bearing is located.

Here, the rotor frame 12 has a step portion 23 that forms the depression 23a.

In particular, when the rotor frame 12 moves in the direction along the shaft center 31 and collides with the metal bearing 16 which is a bearing through the washer 30, the washer 30 causes the washer 30 to become a recess 23a by the metal bearing 16 which is a bearing. The washer 30 is pressed toward and bends into a part of the depression 23a.

Alternatively, when the rotor frame 12 moves in the direction along the axis 31 and collides with the metal bearing 16 which is a bearing through the washer 30, the rotor frame 12 is moved toward the recess 23a by the metal bearing 16 which is a bearing. It includes a step portion 23 formed so that the pressed washer 30 bends into a part of the depression 23a.

With such a configuration, the following effects can be expected. That is, the rotor frame 12 may jump up due to a strong impact or the like applied to the motor 10. In such a case, the motor 10 can reduce the impact by the deformation of the washer 30 when the metal bearing 16 as the bearing collides with the washer 30 in an attempt to return the rotor frame 12 to the original position. Further, in the motor 10, by forming the step portion 23 on the rotor frame 12, the recess 23a formed by the step portion 23 expands the movable range in which the washer 30 bends like a spring. As a result, even if the washer 30 has a small deflection width in the initial state, the washer 30 has a deflection width such that the depression 23a formed by the step portion 23 is in the movable range, so that the spring effect is enhanced. You can That is, the motor 10 can be made thin by reducing the deflection width of the spring when the motor 10 is assembled. In addition, it is possible to effectively suppress the impact sound generated by the collision between the metal bearing 16 and the rotor frame 12.

Further, in the axial direction 32, the magnetic center of the rotor 14 and the magnetic center of the stator 15 may be installed with a predetermined distance.

(Modification)
In the above description, the motor 10 has been described by taking the configuration example in which only one washer 30 is arranged. However, the motor according to the present disclosure may have a configuration in which a plurality of washers are arranged by additionally arranging a flat washer 30B in addition to the washer 30, as shown in FIG. FIG. 6 is an enlarged view of a main part of a motor according to a modified example of the present invention. FIG. 6 shows an example in which a total of two washers 30 and a flat washer 30B are arranged. From the viewpoint of mitigating the collision noise, it is more effective that the flat washer 30B that is likely to rub around is made of resin rather than metal.

As described above, in the motor of this modification, it is preferable that at least one flat washer 30B made of resin is arranged between the metal bearing 16 which is a bearing and the rotor frame 12.

In the above description, a configuration example in which the step portion 23 is used as a gap has been described, but a cushioning member having an elastic force is arranged in the gap portion of the step portion 23 to protect the washer 30 and enhance the impact mitigation effect. It can also be configured.

(Embodiment 2)
FIG. 7 is a configuration diagram showing an outline of the fan motor 50 according to the second embodiment of the present invention. FIG. 8 is a cross-sectional view of a main part of fan motor 50 according to the second embodiment of the present invention. The fan motor 50 includes the motor 10 described in the first embodiment and the fan 56 attached to the shaft 19 of the motor 10.

The fan motor 50 includes a fan 56, a fan fixing portion 57, and a motor 10 in a case 55 composed of a case A portion 55A and a case B portion 55B.

The case 55 has a suction port 64 and a blowout port 65. The case 55 is made of, for example, polybutylene terephthalate (PBT), polycarbonate (Polycarbonate (PC)), polypropylene (Polypropyrene (PP)), a mixture thereof, or a resin such as a glass fiber mixture thereof. Consists of.

-Sirocco fans are used as the fans 56. The fan fixing portion 57 includes an elastic plate 57A and a fan mounting plate 57B.

The elastic plate 57A is made of silicone rubber. Instead of silicone rubber, an adhesive having a predetermined elastic force even after being solidified may be used. Specifically, the same effect can be obtained with a silicon admixture. Instead of the silicone rubber, a foam having elastic force may be used. Specifically, the same effect can be obtained with a rubber sponge or a urethane sponge.

The fan mounting plate 57B is made of a metal material or a resin material. An electrogalvanized steel sheet can be used as the metal material. As the resin material, PBT, PC, PP, a mixture thereof, or a glass fiber mixture thereof can be used. The shaft 19 of the motor 10 is inserted into the fan mounting plate hole 57C located at the center of the fan mounting plate 57B. When the shaft 19 of the motor 10 is press-fitted into the fan mounting plate hole 57C, the fan mounting plate 57B is fixed to the shaft 19.

As described above, since the fan motor 50 of the present embodiment is configured to include the motor of the first embodiment, it is possible to realize a fan motor that suppresses collision noise.

Further, usage examples in which the fan motor 50 is used for a vehicle are shown in FIGS. 9 and 10. FIG. 9 is a perspective conceptual diagram when the fan motor 50 according to the second embodiment of the present invention is used for the storage portion. FIG. 10 is a perspective conceptual diagram when the fan motor 50 according to Embodiment 2 of the present invention is used for a seat.

As shown in FIG. 9, as a vehicle-mounted motor, the fan motor 50 is used to cool the vehicle-mounted battery 80. The flow of air at this time is indicated by arrows 73 (73A, 73B) in the figure.

The fan motor 50 shown in FIG. 9 uses a sirocco fan. By miniaturizing the motor, the vehicle-mounted fan motor 50 is smaller than the conventional one. As a result, in the vehicle in which the fan motor 50 is mounted, the fan motor 50 according to the embodiment of the present invention can increase the degree of freedom in the mounting position as compared with the conventional vehicle-mounted fan motor.

By the way, in a vehicle equipped with the on-vehicle battery 80, a large number of on-vehicle batteries 80 must be arranged by utilizing a limited space. Therefore, the storage portion 81 of the on-vehicle battery 80 forms a complicated wind circuit. Therefore, by using the fan motor 50 according to the embodiment of the present invention, which has a high degree of freedom in the mounting position, the fan motor 50 can be mounted at a position suitable for cooling each on-vehicle battery 80. Therefore, by using the fan motor 50 according to the embodiment of the present invention, a more efficient wind circuit can be formed. As a result, by using the fan motor 50 according to the embodiment of the present invention, it is possible to further promote energy saving and noise reduction of air blowing.

As shown in FIG. 10, the vehicle-mounted fan motor 50 is incorporated into a seat 82 used by a passenger. Specifically, the seat 82 is incorporated into the backrest 82A and the seat seat surface 82B. The air flow at this time is shown by arrows 83 (83A, 83B) in the figure.

The fan motor 50 shown in FIG. 10 also uses a sirocco fan. Therefore, as shown in the drawing, the air (air flow 83A) sucked from the suction port 64 of the fan motor 50 is blown out from the blowout port 65 provided in the surface direction substantially orthogonal to the suction port 64 direction. (Air flow 83B).

In the figure, the fan motor 50 has an example in which the suction port 64 is installed on the surface side of the backrest 82A and the upper surface side of the seat seat surface 82B, and the air flow 83 was explained in an easy-to-understand manner.

However, in consideration of the comfort for passengers and the ease with which air is sucked into the vehicle air conditioner, the fan motor 50 installs the suction port 64 on the back side of the backrest 82A or the bottom side of the seat seat surface 82B. It is better to do

As described above, when the motor according to the first embodiment is used as the on-vehicle fan motor, a strong force equal to or greater than the restoring force is applied to the shaft in the direction opposite to the restoring force when the vehicle runs on a rough road or a step. Sometimes. Even in such a case, the impact at the time of collision between the metal bearing and the rotor frame can be mitigated.

As a result, it is possible to suppress the collision noise generated due to the impact at the time of the collision between the metal bearing and the rotor frame.

The present invention is suitable for in-vehicle use as described above, but can also be used for other applications, for example, equipment that requires space saving and suppression of collision noise due to impact.

10 motor 11 motor case 11A case body 11B case lid 11C case cylindrical portion 12 rotor frame 13 rotor magnet 14 rotor 14a outer peripheral surface 15 stator 15A iron core 15B winding 16 metal bearing (bearing)
16a Rotor-side tip part 18 Thrust plate 19 Shaft 19a Shaft outer peripheral surface 19b Pivot 21 Disk part 22 Cylindrical part 23 Step part 23a Dimple 24 Mounting part 30 Washer 30a Central part 30b End part 30B Flat washer 31 Shaft center 32 Fan 50 direction Motor 55 Case 55A Case A Part 55B Case B Part 56 Fan 57 Fan Fixing Part 57A Elastic Plate 57B Fan Mounting Plate 57C Fan Mounting Plate Hole 64 Inlet 65 Air Outlet 73 Air Flow

73A Air Flow

73B Air Flow 80 In-vehicle battery 81 Storage 82 Seat 82A Backrest 82B Seat surface 83 Air flow 83A Air flow 83B Air flow

Claims

A shaft extending in the axial direction,
A bearing that rotatably supports the shaft about the axis of rotation and the axis of rotation as a center of rotation;
A rotor having a rotor frame attached to the shaft along the axial direction;
A stator positioned opposite to the outer peripheral surface of the rotor with a gap,
A washer located between the bearing and the rotor frame in a direction along the axis,
The rotor frame includes a recess at a position where the washer and the rotor frame face each other,
The washer is a thin plate in which a central portion of the washer is convex toward a side where the bearing is located rather than end portions thereof.
The motor according to claim 1, wherein the rotor frame has a step portion that forms the recess.
When the rotor frame moves in a direction along the axis and collides with the bearing through the washer, the washer pushes the washer toward the recess so that the washer is depressed. The motor according to claim 1 or 2, which is the convex thin plate that bends and enters a part of the.
In the rotor frame, when the rotor frame moves in a direction along the axis and collides with the bearing via the washer, the washer pressed by the bearing toward the recess is one of the recesses. The motor according to claim 2, further comprising the step portion formed so as to bend into the portion.
The motor according to claim 1, wherein a magnetic center of the rotor and a magnetic center of the stator are installed with a predetermined distance in the axial direction.
The motor according to any one of claims 1 to 5, wherein at least one flat washer made of resin is arranged between the bearing and the rotor frame.
A motor according to any one of claims 1 to 6,
A fan attached to the shaft of the motor,
Fan motor.