MOTOR AND REDUCTION GEAR

• US 20200136443A1
• Filed: 10/16/2019
• Published: 04/30/2020
• Est. Priority Date: 10/29/2018
• Status: Active Grant

• Current Assignee: Nidec Corporation
• Original Assignee: Nidec Corporation
• Inventors: VU, Ha Hai, CHEN, Chien Yu
• Granted Patent: US 11,146,127 B2
• Time in Patent Office: Days
• CPC Class Codes: H02K 1/187 to inner stators
• CPC Class Codes: H02K 15/02 of stator or rotor bodies
• CPC Class Codes: H02K 5/04 Casings or enclosures characterised by the shape, form or construction thereof
• CPC Class Codes: H02K 5/08 Insulating casings
• CPC Class Codes: H02K 5/18 with ribs or fins for improving heat transfer
• CPC Class Codes: H02K 7/116 with gears
• CPC Class Codes: H02K 9/227 Heat sinks

Abstract

A motor includes a motor body, a first cover covering at least one part of the motor body on the radial outer side of the motor body, and a second cover covering at least one part of the motor body on one axial side and the radial outer side of the motor body. The first and second covers make contact on the radial outer side of the motor body. The second cover includes first and second parts, the first part is in a disk shape, the second part is located on the radial outer side of at least one part of the first part and includes a wall part and an eave part, the wall part is formed in the axial direction, and the eave part is formed in the radial direction from one axial end of the radial outer side of the wall part.

Claims

1. A motor, comprising:

a motor body, disposed to be capable of rotating with a central axis as the centre,

a first cover, covering at least one part of the motor body on a radial outer side of the motor body, and

a second cover, covering at least one part of the motor body on one axial side and the radial outer side of the motor body, wherein the first cover and the second cover make contact on the radial outer side of the motor body,

wherein

the second cover is composed of a first part and a second part,

the first part is in a disk shape extending along a plane perpendicular to an axial direction,

the second part is located on a radial outer side of at least one part of the first part, and comprises a wall part and an eave part, the wall part is formed in the axial direction with the central axis of the motor body as the centre, and the eave part is formed in a radial direction from one axial end of a radial outer side of the wall part.

2. The motor according to claim 1, wherein

protrusion parts are arranged on a surface of one side of the eave part.

3. The motor according to claim 2, wherein

the protrusion parts are formed to be in a cylindrical shape or a rib shape.

4. The motor according to claim 1, wherein

the eave part is composed of a plurality of stage parts and a plurality of notch parts which are disposed alternately.

5. The motor according to claim 4, wherein

protrusion parts are arranged on surfaces of one sides of the plurality of stage parts.

6. The motor according to claim 5, wherein

the protrusion parts are in the cylindrical shape or the rib shape.

7. The motor according to claim 1, wherein

a first joint part is formed at a position, close to the second part, of the first part, a second joint part is formed at a position, close to the first part, of the second part, and the first joint part and the second joint part enable the first part and the second part to be jointed together.

8. The motor according to claim 7, wherein

the first joint part is a clamping part formed towards a radial outer side, the second joint part is a groove formed towards the radial outer side from the wall part of the second part, and the clamping part is inserted into the groove to enable the first part and the second part to be embedded together.

9. The motor according to claim 7, wherein

the first joint part and the second joint part are both sticking faces, and the first part and the second part are bonded together through the sticking faces.

10. The motor according to claim 1, wherein

the first part is made of a plastic material, and the second part is made of a metal material.

11. The motor according to claim 1, wherein

the second part is made of a material with heat conductivity not lower than 200 W/mK.

12. The motor according to claim 1, wherein

a size ratio of the first part to the second part is 7 to 3.

13. The motor according to claim 1, wherein

the motor is an axial magnetic flux motor.

14. A reduction gear, provided with a motor and a reduction assembly connected with the motor in an axial direction,

wherein

the motor is the motor according to claim 1,

the reduction assembly is provided with a gear and a gear cover disposed opposite to the gear in a radial direction, the gear and the gear cover being disposed on the other axial side of the motor body.