Motor

Patent metadata

Field	Value
Publication number	US-11190076-B2
Application number	US-201716461882-A
Country	US
Kind code	B2
Filing date	Nov 22, 2017
Priority date	Nov 28, 2016
Publication date	Nov 30, 2021
Grant date	Nov 30, 2021

Abstract

A motor according to the present invention includes: a stator having a stator core and a coil; a rotor having a rotary shaft and a rotation body; a shaft bearing rotatably supporting the rotor; and a molding resin covering the stator. The motor has a coil end that is the coil protruding from the stator core in a shaft center X direction, and has a non-combustible layer provided to cover the coil end. The non-combustible layer is a metallic cover made of, for example, metal. The metallic cover is disposed to cover a periphery of a coil assembly in which the coil is formed on the stator core through an insulator. The metallic cover is integrated with the coil assembly by a molding resin.

First claim

The invention claimed is:

1. A motor comprising:
a stator including
a stator core, and
a coil wound on the stator core;

a rotor disposed inside the stator, the rotor including
a rotary shaft extending in a shaft center direction, and
a rotation body that includes a magnet component, extends in the shaft center direction, and is fixed to the rotary shaft;

a shaft bearing that rotatably holds the rotor; and
a molding resin coveting the stator and in direct contact with the stator core and the coil, wherein:
the coil includes a coil end protruding from the stator core in the shall center direction, and is provided with a non-combustible layer made of a metal and covering and surrounding an entirety of the stator, and
the non-combustible layer is separated from the coil.

2. The motor according to claim 1 , wherein the non-combustible layer is formed to extend in the shaft center direction at a position on an outer peripheral side of the coil end.

3. The motor according to claim 1 , wherein the non-combustible layer is formed to extend, in a radial direction, at a position on a side of the coil end opposite to the stator core.

4. The motor according to claim 1 , wherein the non-combustible layer is formed on an outer surface of the molding resin.

5. The motor according to claim 1 , comprising a metallic cover, as the non-combustible layer, provided to cover and surround the entirety of the stator through the molding resin.

6. The motor according to claim 1 , wherein the non-combustible layer includes iron, stainless steel, brass or aluminum.

7. The motor according to claim 1 , wherein the non-combustible layer further covers a transition wire for the coil.

8. The motor according to claim 1 , comprising a metallic inner cover disposed, as the non-combustible layer, to cover a side surface of the stator core, wherein the stator and the metallic inner cover are integrated by the molding resin.

9. The motor according to claim 1 , comprising:
a first bracket disposed at a first end of the stator; and
a second bracket disposed at a second end of the stator, wherein:
the non-combustible layer has a hollow cup shape having a top surface, a cylindrical part and an opening at a center of the top surface, and
the cylindrical part surround the entirety of the stator, and a part of the non-combustible layer covers a part of the second bracket.

10. A motor comprising:
a stator including
a stator core, and
a coil wound on the stator core;

a rotor disposed inside the stator, the rotor including
a rotary shaft extending in a shaft center direction, and
a rotation body that includes a magnet component, extends in the shaft center direction, and is fixed to the rotary shaft;

a shaft bearing that rotatably holds the rotor; and
a molding resin covering the stator, wherein:
the coil includes a coil end protruding from the stator core in the shaft center direction, and is provided with a non-combustible layer made of a metal and covering the coil end, and
the non-combustible layer further covers a transition wire for the coil.

11. A motor comprising:
a stator including
a stator core, and
a coil wound on the stator core;

a rotor disposed inside the stator, the rotor including
a rotary shaft extending in a shaft center direction, and
a rotation body that includes a magnet component, extends in the shaft center direction, and is fixed to the rotary shaft;

a shaft bearing that rotatably holds the rotor; and
a molding resin covering the stator, wherein:
the coil includes a coil end protruding from the stator core in the shaft center direction, and is provided with a non-combustible layer made of a metal and covering the coil end, and
the motor comprises a metallic inner cover disposed, as the non-combustible layer, to cover a side surface of the stator core, wherein the stator and the metallic inner cover are integrated by the molding resin.

12. The motor according to claim 11 , wherein, in the stator, the molding resin covers a whole of the stator core, the coil, and the metallic inner cover except inner peripheral surfaces of teeth of the stator core.

13. The motor according to claim 11 , further comprising, as the non-combustible layer, a metallic outer cover made of metal and provided on a surface of the molding resin on an outer side of the stator.

14. The motor according to claim 13 , wherein
the metallic inner cover covers at least an outer periphery of the coil end on a first side, of the stator core, in the shaft center direction, and
the metallic outer cover covers at least an outer periphery of the coil end on a second side, of the stator core, in the shaft center direction.

15. The motor according to claim 14 , wherein
the metallic inner cover includes a cylindrical shape including a small-diameter part and a large-diameter part whose diameter is larger than a diameter of the small-diameter part, and
the stator core includes a positioning part provided on an outer periphery of the stator core.

16. The motor according to claim 14 , wherein
the metallic inner cover includes a cylindrical shape including a small-diameter part and a, large-diameter part whose diameter is larger than a diameter of the small-diameter part,
the stator core includes a protrusion provided on an outer periphery of the stator core, and
the small-diameter part includes a tapered part that has an inverse tapered shape and is provided on an end of the small-diameter part.

17. The motor according to claim 14 , wherein the molding resin has a notch that is provided in the molding resin and partially overlaps the metallic outer cover.

18. The motor according to claim 14 , wherein the metallic outer cover includes a chamfer on an edge part, of the metallic outer cover, on an opening side.

19. The motor according to claim 14 , wherein
the stator core includes at least one protrusion protruding outward on an outer periphery of the stator core, and
the metallic inner cover includes a protrusion formed by a swaging process on a part, of the metallic inner cover, in contact with the protrusion.

20. The motor according to claim 14 , further comprising a wall that is formed of an insulating material and is provided in a space where the metallic inner cover and the coil end face each other.

21. The motor according to claim 14 , wherein
the metallic outer cover includes a bent part that is formed by bending an edge part of the metallic outer cover for preventing slipping off, and
the molding resin includes a recess formed in the molding resin.

Assignees

• Panasonic Ip Man Co Ltd
• Panasonic Inteliectual Property Man Co Ltd

Inventors

• Amaya Takanori
• Watanabe Akihiko
• Yamagata Yoshikazu
• Nanbu Yasuo
• Kato Hisaaki
• WAKAMORI Yasunori

Classifications

• H02K3/34 Primary

  between conductors or between conductor and core, e.g. slot insulation · CPC title

• H02K3/522

  for generally annular cores with salient poles · CPC title

• H02K1/185

  to outer stators · CPC title

• H02K7/083

  radially supporting the rotary shaft at both ends of the rotor (H02K7/086, H02K7/09 take precedence) · CPC title

• H02K3/30

  Windings characterised by the insulating material · CPC title