Electric motor

Patent metadata

Field	Value
Publication number	US-9692271-B2
Application number	US-201514642132-A
Country	US
Kind code	B2
Filing date	Mar 9, 2015
Priority date	Mar 17, 2014
Publication date	Jun 27, 2017
Grant date	Jun 27, 2017

Abstract

An electric motor has a stator positioned lengthwise within and fixed to a case. The stator has a stator core, a coil wound around a tooth extending from the stator core, and an insulating member attached to the stator core wherein the insulating member is configured to insulate the coil from the stator core. A wire holding part extends from the insulating member to hold a wire within an outer diameter of the insulating member. A rotor is positioned lengthwise along an inner circumference of the stator wherein the rotor is configured to rotate about a motor axis extending lengthwise across the electric motor.

First claim

What is claimed is:

1. An electric motor comprising:
a stator positioned lengthwise within and fixed to a case wherein the stator has a stator core, a coil wound around a tooth extending from the stator core, and an insulating member attached to the stator core wherein the insulating member is configured to insulate the coil from the stator core;
a wire holding part extending from the insulating member wherein the wire holding part is configured to hold a wire substantially within an outer diameter of the insulating member to permit the wire to connect with a wire connecting part formed in the insulating member; and
a rotor positioned lengthwise along an inner circumference of the stator wherein the rotor is configured to rotate about a motor axis extending lengthwise across the electric motor,
wherein the wire holding part further comprises:
a coil regulating part to regulate the position of the coil along the motor axis; and
a holding part for fitting the wire between the holding part and the coil regulating part wherein the holding part faces the coil regulating part along the motor axis when viewed along the motor axis such that the wire in the holding part cannot be moved to be released from the holding part along the motor axis.

2. The electric motor of claim 1 , wherein the wire connecting part extending from the insulating member and further wherein the wire connecting part is configured to permit the wire to connect to the coil.

3. The electric motor of claim 1 , wherein the wire holding part is a clip that protrudes outwardly in the radial direction of the stator core.

4. The electric motor of claim 1 , wherein the holding part is configured to be a curved member to hold the wire within an inner circumference thereof.

5. The electric motor of claim 4 , wherein the curved member is configured to open and close.

6. The electric motor of claim 4 , wherein the curved member is configured to be detachable.

7. The electric motor of claim 1 , wherein the wire holding part is configured to hold more than one wire.

8. The electric motor of claim 1 , wherein the wire holding part is integrally formed with the insulating member.

9. An electric power tool comprising the electric motor of claim 1 .

10. The electric motor of claim 1 , wherein the holding part is integrally formed with the coil regulating part.

11. The electric motor of claim 1 , wherein the wire holding part holds the wire by elasticity thereof in a fitting manner.

12. The electric motor of claim 1 , wherein an end tip of the holding part is bent outward in a direction of the motor axis.

13. The electric motor of claim 1 , wherein the coil regulating part includes a claw part that is configured to hook the wire.

14. The electric motor of claim 1 , wherein the wire holding part includes two holding parts and one coil regulating part.

15. The electric motor of claim 1 , wherein the one coil regulating part is located between the two holding parts when viewed from a direction of the motor axis.

16. The electric motor of claim 1 , wherein the coil regulating part includes a protrusion that positions and prevents slippage of the wire.

17. The electric motor of claim 1 , wherein the holding part allows for the wire to be moved along the motor axis while still being held within the holding part.

18. The electric motor of claim 1 , wherein:
the holding part includes an opening for releasing the wire from the holding part such that, in order to remove the wire, the wire is moved through the opening, and
the opening is positioned so that moving the wire in a direction that is along the motor axis does not remove the wire from the holding part.

19. An electric motor comprising:
a stator positioned lengthwise within and fixed to a case wherein the stator has a stator core, a coil wound around a tooth extending from the stator core, and an insulating member attached to the stator core wherein the insulating member is configured to insulate the coil from the stator core;
a wire holding part extending from the insulating member wherein the wire holding part is configured to hold a wire substantially within an outer diameter of the insulating member to permit the wire to connect with a wire connecting part formed in the insulating member; and
a rotor positioned lengthwise along an inner circumference of the stator wherein the rotor is configured to rotate about a motor axis extending lengthwise across the electric motor,
wherein the wire holding part further comprises:
a coil regulating part to regulate the position of the coil along the motor axis; and
a holding part for fitting the wire between the holding part and the coil regulating part,

wherein the wire is held between an inner circumference of the holding part and the coil regulating part by two ends of the holding part to the coil regulating part being attached on opposing sides of the wire so that the wire in the holding part cannot be released from the holding part in a direction along the motor axis.

20. The electric motor of claim 19 , wherein the two ends of the holding part are attached to hold the wire in place with respect to the insulating member by closing one of the ends of the holding part with respect to the coil regulating part.

Assignees

• Makita Corp

Inventors

• Sengiku Hitoshi
• Tomita Youko

Classifications

• H02K2203/09

  Machines characterised by wiring elements other than wires, e.g. bus rings, for connecting the winding terminations · CPC title

• H02K3/521

  applicable to stators only · CPC title

• H02K2213/03

  Machines characterised by numerical values, ranges, mathematical expressions or similar information · CPC title

• H02K3/52

  Fastening salient pole windings or connections thereto · CPC title

• H02K3/522 Primary

  for generally annular cores with salient poles · CPC title