Insulating cover for motor and motor

Abstract

The utility model provides an insulating cover for a motor and the motor. The motor comprises a stator and a rotor, the rotor comprises a rotor shaft and a rotor body arranged on the rotor shaft, the rotor shaft is supported by a first bearing and a second bearing, and the rotor body is located between the first bearing and the second bearing; a first insulation cover is arranged at the first end, close to the first bearing, of the rotor body. The first insulation cover comprises an outer part at least partially covering the first end of the rotor body and an inner part at least partially covering the first end of the rotor body. An inner portion in contact with a bearing inner ring of the first bearing; and a plurality of elastic arms connected between the outer portion and the inner portion; when the first insulating cover is installed in place, the plurality of elastic arms of the first insulating cover are pressed and deformed so as to apply elastic force to the bearing inner ring of the first bearing. The insulating cover according to the present application suppresses axial vibration of the rotor shaft.

Description

Technical Field

[0001] This application relates to the field of motors, and more particularly, to an insulating cover for a motor. Background Art

[0002] A motor generally includes a rotor shaft and a pair of bearings for supporting the rotor shaft. The bearings generally include an inner bearing ring and an outer bearing ring. The outer bearing ring is fixed in the motor housing, and the inner bearing ring cooperates with the rotor shaft and thus rotates with the rotor shaft. Generally, the inner bearing ring can move axially relative to the outer bearing ring in a small range, which will cause the axial movement of the rotor shaft. In order to suppress this movement to reduce the vibration and noise of the motor, a metal elastic washer is generally used to limit the axial movement of the inner bearing ring. Summary of the Utility Model

[0003] The purpose of this application is to solve or at least alleviate the problems existing in the prior art.

[0004] According to one aspect of this application, a motor is provided, which includes:

[0005] A stator and a rotor, the rotor includes: a rotor shaft and a rotor body arranged on the rotor shaft. The rotor shaft is respectively supported by a first bearing and a second bearing, and the rotor body is located between the first bearing and the second bearing;

[0006] Wherein, a first end of the rotor body close to the first bearing includes a first insulating cover, and the first insulating cover includes:

[0007] An outer part at least partially covering the first end of the rotor body;

[0008] An inner part in contact with the inner bearing ring of the first bearing; and

[0009] A plurality of elastic arms connecting the outer part and the inner part;

[0010] When installed in place, the plurality of elastic arms of the first insulating cover are deformed under pressure to apply an elastic force to the inner bearing ring of the first bearing.

[0011] Optionally, in the embodiment of the motor, the rotor body further includes: a core and a coil. The core includes a plurality of bare teeth. The outer part of the first insulating cover includes an outer annular part and a plurality of tooth parts extending radially outward from the outer annular part. The plurality of tooth parts cover the plurality of bare teeth of the core at the first end, and the coil is wound around the plurality of tooth parts of the first insulating cover.

[0012] Optionally, in the embodiment of the motor, the rotor body includes a second insulating cover at a second end opposite to the first end. The second insulating cover includes a plurality of tooth portions covering a plurality of bare teeth of the core at the second end. The coil is wound around the plurality of tooth portions of the first insulating cover and the second insulating cover. Among them, the plurality of tooth portions of the first insulating cover and the second insulating cover are provided with wire winding grooves.

[0013] Optionally, in the embodiment of the motor, an inner part of the first insulating cover is configured as an inner annular portion. The inner annular portion is sleeved on the rotor shaft and can axially move relative to the rotor shaft.

[0014] Optionally, in the embodiment of the motor, the plurality of elastic arms include three or more elastic arms and the plurality of elastic arms are evenly distributed in a circumferential direction. The plurality of elastic arms are in a U shape. A first end of the plurality of elastic arms is connected to the outer part and a second end of the plurality of elastic arms is connected to the inner part.

[0015] Optionally, in the embodiment of the motor, the plurality of elastic arms are configured such that when the inner part of the first insulating cover axially moves 1 millimeter relative to the outer part, an elastic force greater than 10 N is provided.

[0016] Optionally, in the embodiment of the motor, the motor further includes a housing. The housing includes a cylindrical housing body and an end cover installed at one end of the housing body. An outer ring of the first bearing is fixedly installed at the bottom of the housing body. An outer ring of the second bearing is fixedly installed in an opening of the end cover. The rotor shaft includes an output end passing through the end cover.

[0017] Optionally, in the embodiment of the motor, the first insulating cover (4) is integrally formed of a plastic material.

[0018] According to another aspect of the present application, an insulating cover for a motor is further provided. The insulating cover includes:

[0019] An outer annular portion;

[0020] An inner annular portion; and

[0021] A plurality of elastic arms connected between the outer annular portion and the inner annular portion.

[0022] Optionally, the insulating cover further includes a plurality of tooth portions extending radially outward from the outer annular portion. The plurality of elastic arms are configured such that when the inner annular portion of the insulating cover axially moves 1 millimeter relative to the outer annular portion, an elastic force greater than 10 N is provided. The insulating cover is integrally formed of a plastic material.

[0023] The insulating cover according to the present application suppresses the axial vibration of the rotor shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Referring to the accompanying drawings, the disclosure of the present application will become more readily understandable. It is readily understood by those skilled in the art that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present application. In addition, similar numbers in the figures are used to represent similar components, where:

[0025] Figure 1 A perspective view of a motor according to an embodiment is shown;

[0026] Figure 2 A longitudinal sectional view of a motor according to an embodiment is shown;

[0027] Figure 3 and Figure 4 Perspective views of the front and back of an insulating cover according to an embodiment are shown respectively; and

[0028] Figure 5 A sectional view of an insulating cover according to an embodiment is shown. DETAILED DESCRIPTION

[0029] Referring to Figure 1 and Figure 2 , which show a perspective view and a sectional view of a motor according to an embodiment. The motor according to the embodiment includes: a housing 1; a stator 6 and a rotor 2 in the housing 1, the stator 6 can be arranged around the rotor 2. In this embodiment, the stator 6 is a permanent magnet, and the rotor 2 includes a coil. However, it is also conceivable that the stator 6 includes a coil and the rotor 2 includes a permanent magnet. In this embodiment, the rotor 2 includes: a rotor shaft 21 and a rotor body 22 arranged on the rotor shaft 21. The rotor shaft 21 is supported by a first bearing 7 and a second bearing 8 respectively, and the rotor body 22 is located between the first bearing 7 and the second bearing 8. The rotor body 22 includes a first insulating cover 4 at a first end close to the first bearing 7. The first insulating cover 4 includes: an outer portion 41 that at least partially covers the first end of the rotor body 22; an inner portion 42 that contacts the inner ring 72 of the first bearing; and a plurality of elastic arms 43 connected between the outer portion 41 and the inner portion 42. When installed in place, the plurality of elastic arms 43 of the first insulating cover 4 are deformed under pressure to apply an elastic force to the inner ring 71 of the first bearing. This elastic force restricts the axial vibration of the inner ring 71 of the bearing and the rotor shaft 21 fixedly connected thereto.

[0030] In the illustrated embodiment, the housing 1 includes a generally cylindrical housing body 11 and an end cap 12. The housing body 11 has a bottom wall and a side wall. The end cap 12 is mounted at one end (the top in the figure) of the housing body 11. The first bearing 7 is mounted in a bearing seat at the bottom of the housing body 11, and the outer ring 71 of the bearing is fixed in the bearing seat, and the inner ring 72 of the bearing is fitted to the rotor shaft 21, such as an interference fit. The second bearing 8 is mounted in an opening of the end cap 12, the outer ring 81 of the bearing is fixed to the opening of the end cap 12, and the inner ring 82 of the bearing is fitted to the rotor shaft 21, such as an interference fit. The rotor shaft 21 has an output end 211 that extends beyond the second bearing 8 and the end cap 12.

[0031] In the illustrated embodiment, the rotor body 22 includes a coil 5. Specifically, the rotor body 22 includes: a core 23 and a coil 5. The core 23 is formed by laminating metal sheets, for example, and includes a yoke portion and a plurality of bare teeth extending from the yoke portion, as Figure 3 and Figure 4 shown. The outer portion 41 of the first insulating cover includes an outer annular portion 411 and a plurality of tooth portions 412 extending radially outward from the outer annular portion 411. The plurality of tooth portions 412 cover the plurality of bare teeth of the core 23 at the first end of the rotor body 22, and the coil 5 is wound around the plurality of tooth portions 412 of the first insulating cover.

[0032] In some embodiments, the rotor body includes a second insulating cover 3 at a second end opposite to the first end. The second insulating cover 3 includes a plurality of tooth portions that cover the plurality of bare teeth of the core at the second end of the rotor body 22. The coil 5 is wound around the plurality of tooth portions of the first insulating cover 4 and the second insulating cover 3, thereby being spaced apart from the core. It should be understood that the plurality of tooth portions of the first insulating cover 4 and the second insulating cover 3 may further include end extensions 414 at the ends of each tooth portion and side extensions 415 on the sides of each tooth portion, thereby fully separating the coil 5 from the core 23. In some embodiments, as Figure 3 shown, the plurality of tooth portions of the first insulating cover 4 and the second insulating cover 3 are provided with wire grooves 413. It can be conceived that in an alternative embodiment, the rotor body 22 can be configured to include a permanent magnet, such as a permanent magnet steel. In this case, the outer portion of the first insulating cover 4 and / or the second insulating cover 3 can be, for example, a circular baffle covering each group of magnetic steels.

[0033] In some embodiments, the inner portion 42 of the first insulating cover can be configured as an inner annular portion having a central hole 40 to be sleeved on the rotor shaft 21. It should be understood that the central hole 40 of the inner annular portion has a clearance fit with the rotor shaft 21, so that the inner annular portion can move axially relative to the rotor shaft 21, thereby compressing the elastic arm 43 to apply a force to the inner ring 72 of the first bearing 7.

[0034] In some embodiments, the plurality of elastic arms 43 includes three or more elastic arms 43 and the plurality of elastic arms 43 are evenly distributed along the circumference. For example, the figure shows 8 elastic arms 43 provided. In some embodiments, as Figure 5 shown, the plurality of elastic arms 43 are U-shaped. The first ends 431 of the plurality of elastic arms 43 are connected to the outer annular portion 41 and the second ends 432 of the plurality of elastic arms 43 are connected to the inner annular portion 42. The closed end of the U-shape between the first end 431 and the second end 432 faces the first bearing. The plurality of elastic arms 43 should be selected from materials with a certain resilience to ensure that sufficient elastic force can be applied under the condition of a small displacement. In some embodiments, the plurality of elastic arms 43 are configured such that when the inner part 42 of the first insulating cover moves axially 1 millimeter relative to the outer part 41, an elastic force greater than 10 N is provided. In the illustrated embodiment, when installed in place, the inner part 42 of the first insulating cover moves axially 1 to 2 millimeters relative to the outer part 41. At this time, the inner part 42 of the first insulating cover applies a force of more than 20 N to the inner ring 72 of the first bearing 7. In some embodiments, the first insulating cover 4 includes its outer part 41, inner part 42, and the plurality of elastic arms 42 are integrally formed of plastic material.

[0035] According to another aspect of the present application, there is provided an insulating cover for a motor. The insulating cover includes: an outer annular portion; an inner annular portion; and a plurality of elastic arms connected between the outer annular portion and the inner annular portion. The insulating cover can be integrally formed of plastic material. The plurality of elastic arms are configured such that when the inner part of the insulating cover moves axially 1 millimeter relative to the outer part, an elastic force greater than 10 N is provided. The insulating cover according to the present application has an axial limiting function for the rotor shaft without providing additional structures such as springs or elastic washers, reducing parts and saving costs.

[0036] The specific embodiments described above of the present application are only for more clearly describing the principle of the present application, in which each component is clearly shown or described to make the principle of the present application easier to understand. Without departing from the scope of the present application, those skilled in the art can easily make various modifications or changes to the present application. Therefore, it should be understood that these modifications or changes should be included within the scope of the patent protection of the present application.

Claims

1. A motor, comprising: A stator (6) and a rotor (2), the rotor (2) comprising: a rotor shaft (21) and a rotor body (22) provided on the rotor shaft (21), the rotor shaft (21) being supported by a first bearing (7) and a second bearing (8) respectively, and the rotor body (22) being located between the first bearing (7) and the second bearing (8); Characterized in that a first end of the rotor body (22) close to the first bearing (7) comprises a first insulating cover (4), and the first insulating cover (4) comprises: An outer part (41) at least partially covering the first end of the rotor body (22); An inner part (42) in contact with the inner ring (72) of the first bearing (7); and A plurality of elastic arms (43) connecting the outer part (41) and the inner part (42); When installed in place, the plurality of elastic arms (43) of the first insulating cover are compressed and deformed to apply an elastic force to the inner ring (72) of the first bearing.

2. The motor according to claim 1, characterized in that, The rotor body (22) further comprises: a core (23) and a coil (5), the core (23) comprising a plurality of bare teeth, the outer part (41) of the first insulating cover comprises an outer annular part (411) and a plurality of tooth parts (412) radially extending outward from the outer annular part (411), the plurality of tooth parts (412) cover the plurality of bare teeth of the core (23) at the first end, and the coil (5) is wound around the plurality of tooth parts (412) of the first insulating cover.

3. The motor according to claim 2, characterized in that, The rotor body (22) comprises a second insulating cover (3) at a second end opposite to the first end, the second insulating cover (3) comprises a plurality of tooth parts covering the plurality of bare teeth of the core at the second end, the coil (5) is wound around the plurality of tooth parts of the first insulating cover (4) and the second insulating cover (3), wherein the plurality of tooth parts of the first insulating cover and the second insulating cover are provided with wire winding grooves (413).

4. The motor according to claim 1, characterized in that, The inner part (42) of the first insulating cover is configured as an inner annular part, the inner annular part is sleeved on the rotor shaft (21) and can axially move relative to the rotor shaft (21).

5. The electric machine according to any one of claims 1 to 4, characterized in that, The plurality of elastic arms (43) include three or more elastic arms and the plurality of elastic arms (43) are evenly distributed in a circumferential direction, the plurality of elastic arms (43) are U-shaped, a first end of the plurality of elastic arms (43) is connected to the outer part (41) and a second end of the plurality of elastic arms is connected to the inner part (42).

6. The electric machine according to any one of claims 1 to 4, characterized in that, The plurality of elastic arms (43) are configured such that when the inner part (42) of the first insulating cover axially moves 1 mm relative to the outer part (41), an elastic force greater than 10 N is provided.

7. The electric machine according to any one of claims 1 to 4, characterized in that, The motor further includes a housing (1), the housing (1) includes a cylindrical housing body (11) and an end cover (12) installed at one end of the housing body (11). The outer ring of the first bearing (7) is fixedly installed at the bottom of the housing body (11), and the outer ring of the second bearing (8) is fixedly installed in the opening of the end cover (12). The rotor shaft (21) includes an output end (211) passing through the end cover.

8. The electric machine according to any one of claims 1 to 4, characterized in that The first insulating cover (4) is integrally formed of a plastic material.

9. An insulating cover for an electric motor, characterized in that, The insulating cover includes: An outer annular portion; An inner annular portion; and A plurality of elastic arms (43) connected between the outer annular portion and the inner annular portion.

10. The insulating cover according to claim 9, wherein, The insulating cover further includes a plurality of tooth portions extending radially outward from the outer annular portion. The plurality of elastic arms (43) are configured to provide an elastic force greater than 10 N when the inner annular portion of the insulating cover moves axially relative to the outer annular portion by 1 mm. The insulating cover is integrally formed of a plastic material.

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