Three phase motor

• US 20020084713A1
• Filed: 09/17/2001
• Published: 07/04/2002
• Est. Priority Date: 12/28/2000
• Status: Active Grant

• Current Assignee: Aisin AW Company Limited (Aisin Corp.)
• Original Assignee: Aisin AW Company Limited (Aisin Corp.)
• Inventors: Kuroyanagi, Toru
• Granted Patent: US 6,703,749 B2
• Time in Patent Office: Days
• US Class Current: 310/180
• CPC Class Codes: H02K 2203/06 Machines characterised by the wiring leads, i.e. conducting wires for connecting the winding terminations
• CPC Class Codes: H02K 2203/09 Machines characterised by wiring elements other than wires, e.g. bus rings, for connecting the winding terminations
• CPC Class Codes: H02K 3/50 Fastening of winding heads, equalising connectors, or connections thereto

Abstract

A three-phase motor allows connection of neutral end portions of the coil conductors without substantially increasing the axial length of the motor. The neutral end portions of the coil conductors extend in parallel arrangement over end portions of the coil assemblies to the peripheral outer side of the coil assemblies where neutral end portions of the coil conductors are connected to spaced points on a bus bar to form a neutral for the three phases of the coils.

Claims

1. A three phase motor comprising:

a motor having a stator core and a coil assembly including coils of three phases disposed in the stator core;

neutral end portions of the conductors of the respective coils extending one by one from the inside of the coil assembly to the outer periphery of the coil assembly;

a bus bar formed of a conductive material on the outer peripheral side of the coil assembly; and

said neutral end portions of the coil conductors being electrically connected to the bus bar so that the neutral end portions and the bus bar form a neutral point for the three phases.

2. A three phase motor according to claim 1, wherein the bus bar is provided with a connecting portion to which the neutral end portions of the coil conductors are connected.

3. A three-phase motor according to claim 2, wherein the connecting portion includes a slit.

4. A three-phase motor according to claim 2, connecting portion includes a hole.

5. A three-phase motor according to claim 2, wherein the coil conductors include an insulative coating, and the connecting portion includes means for penetrating the insulative coating to electrically join the connecting portion and a conductive core of the neutral end portions of the coil conductors.

6. A three-phase motor according to claim 5, wherein means for penetrating the insulative coating includes steps formed by a cross sectional portion of a plurality of laminated thin metal sheets.

7. A three-phase motor according to claim 5, wherein the means for penetrating the insulative coating includes a step formed by a tip of a leaf spring on one side of a hole in the connecting portion and into which the neutral end portions of the coil conductors are inserted.

8. A three-phase motor according to claim 2, wherein the connecting portion includes a plurality of detachable metal terminal members to which the neutral end portions of the coil conductors are electrically connected.

9. A three-phase motor according to claim 8, wherein each detachable metal terminal member includes a slit for electrically connecting to a neutral end portion.

10. A three-phase motor according to claim 8, wherein each detachable metal terminal member includes a hole for electrically connecting to a neutral end portion.

11. A three-phase motor according to claim 8, wherein the coil conductors have an insulative coating, and each of the detachable metal terminal members includes means for penetrating the insulative coating to electrically connect the metal terminal member to a conductive core of one of the neutral end portions of the coil conductors.

12. A three-phase motor according to claim 11, wherein the means for penetrating the insulative coating includes steps formed from a cross sectional portion of a plurality of laminated thin sheets.

13. A three-phase motor according to claim 11, wherein the means for penetrating the insulative coating includes a step formed by a tip of a leaf spring on one side of a hole in the metal terminal member and into which the neutral end portions of the coil conductors are inserted.

14. A three-phase motor according to claim 1, wherein the bus bar is formed of a plate-shaped member and formed in an arc along the outer periphery portion of the stator core.

15. A three-phase motor according to claim 1, wherein a plurality of bus bars are installed along the outer periphery portion of the stator core.

16. A three-phase motor according to claim 1, wherein the neutral end portions of the coil conductors extend around an end portion of the coil assembly in a parallel arrangement.

17. A three-phase motor according to claim 2, wherein the connecting portion includes a crimping member for crimping a plurality of neutral end portions of the coil conductors arranged in a line.

18. A three-phase motor according to claim 1, further comprising conductor terminal members at the tips of the neutral end portions of the coil conductors, and means for connecting the conductor terminal members to the bus bar.

19. A three-phase motor according to claim 1, wherein a width of the bus bar in the axial direction of the stator is formed smaller than a width of the end of the coil assembly extending in the axial direction from the stator core.