BUSBAR UNIT AND MOTOR

• US 20120319512A1
• Filed: 02/28/2011
• Published: 12/20/2012
• Est. Priority Date: 03/03/2010
• Status: Active Grant

• Current Assignee: Nidec Corporation
• Original Assignee: Nidec Corporation
• Inventors: Nakagawa, Airi
• Granted Patent: US 9,160,217 B2
• Time in Patent Office: Days
• US Class Current: 310/71
• CPC Class Codes: H02K 1/148 Sectional cores H02K1/141 takes precedence
• CPC Class Codes: H02K 1/278 Surface mounted magnets; Inset magnets
• CPC Class Codes: H02K 15/03 having permanent magnets
• CPC Class Codes: H02K 15/095 by laying conductors around salient poles
• CPC Class Codes: H02K 15/12 Impregnating, heating or drying of windings, stators, rotors or machines
• 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 2203/12 Machines characterised by the bobbins for supporting the windings
• CPC Class Codes: H02K 3/522 for generally annular cores with salient poles
• CPC Class Codes: H02K 5/225 Terminal boxes or connection arrangements specially adapted for submersible motors H02K5/132

Abstract

A busbar unit is arranged on an axial end portion of a stator and electrically connected with a plurality of coil wire terminals arranged to project in an axial direction above the axial end portion of the stator. The busbar unit includes a plurality of busbars each including a body portion defined by an electrically conductive wire having an annular or “C” shape, the body portion being arranged around an axis of the stator; a holder member arranged on the axial end portion of the stator to hold the busbars; and a plurality of terminal members each including a busbar connection portion connected with the body portion of one of the busbars, and a coil connection portion connected with one of the coil wire terminals.

Claims

1-14. -14. (canceled)

15. A busbar unit arranged on an axial end portion of a stator, and electrically connected with a plurality of coil wire terminals arranged to project in an axial direction above the axial end portion of the stator, the busbar unit comprising:

a plurality of busbars each including a body portion defined by an electrically conductive wire having an annular or “

C”

shape;

a holder member arranged on the axial end portion of the stator to hold the busbars; and

a plurality of terminal members each including a busbar connection portion connected with the body portion of one of the busbars and a coil connection portion connected with one of the coil wire terminals.

16. The busbar unit according to claim 15, wherein each of the busbars includes an external connection portion defined by an electrically conductive wire continuous and integral with the body portion, and arranged to be electrically connected with an external power supply.

17. The busbar unit according to claim 15, wherein the holder member is defined by a plurality of annular holders placed one upon another in the axial direction, each of the holders including an accommodating groove in an annular shape or in a “

C”

shape arranged to accommodate and separately hold the body portion of a separate one of the busbars.

18. The busbar unit according to claim 16, wherein the holder member is defined by a plurality of annular holders placed one upon another in the axial direction, each of the holders including an accommodating groove in an annular shape or in a “

C”

shape arranged to separately accommodate and hold the body portion of a separate one of the busbars and a lead groove arranged to accommodate and hold the external connection portion of the busbar to allow the external connection portion to be drawn from the accommodating groove in a radial direction.

19. The busbar unit according to claim 18, wherein the external connection portion of each of the busbars extends in the axial direction after extending from the accommodating groove in the radial direction.

20. The busbar unit according to claim 19, wherein

the lead groove of each of the holders is arranged to extend radially inward from the accommodating groove and then extend in the axial direction;

and

an inner circumferential surface of each of the holders includes a vertical lead groove defined therein correspondingly to the lead groove of a different one of the holders, and arranged to accommodate and hold the external connection portion extending through the lead groove of the different holder to allow the external connection portion to be drawn in the axial direction.

21. The busbar unit according to claim 17, wherein each of the holders has an identical configuration.

22. The busbar unit according to claim 18, wherein each of the holders has an identical configuration.

23. The busbar unit according to claim 17, wherein the holders are placed one upon another such that the accommodating grooves of the respective holders do not have opening surfaces thereof facing each other.

24. The busbar unit according to claim 21, wherein the holders are placed one upon another such that the accommodating grooves of the respective holders do not have opening surfaces thereof facing each other.

25. The busbar unit according to claim 17, wherein each of the holders includes a first annular surface and a second annular surface, the first annular surface including a plurality of raised portions defined therein, the second annular surface including a plurality of recessed portions defined therein to have the raised portions of a different one of the holders fitted therein.

26. The busbar unit according to claim 15, wherein

each of the terminal members is defined by a single piece of plate material;

and

each of the terminal members includes a plate-shaped joining portion arranged to extend continuously between the busbar connection portion and the coil connection portion, the joining portion being bent in a plate thickness direction thereof.

27. The busbar unit according to claim 15, wherein each of the busbars is defined by a bare electric wire.

28. The busbar unit according to claim 16, wherein each of the busbars is defined by a bare electric wire.

29. The busbar unit according to claim 19, wherein each of the busbars is defined by a bare electric wire.

30. The busbar unit according to claim 23, wherein each of the busbars is defined by a bare electric wire.

31. The busbar unit according to claim 26, wherein each of the busbars is defined by a bare electric wire.

32. A motor comprising:

the busbar unit of claim 15; and

a stator including a plurality of coils and a plurality of coil wire terminals arranged to project therefrom in an axial direction;

wherein

the busbar unit is arranged on an axial end portion of the stator, and the terminal members of the busbar unit are connected with the coil wire terminals of the stator.

33. The motor according to claim 32, wherein the coil wire terminals are arranged at regular intervals in a circumferential direction about an axis of the stator.

34. The motor according to claim 32, further comprising:

a neutral point busbar defined by an electrically conductive wire having an annular or a “

C”

shape; and

a groove portion defined in the axial end portion of the stator and arranged to hold the neutral point busbar;

wherein

the coils of the stator are connected in a star configuration;

the coil wire terminals include a neutral point terminal; and

the terminal members include a neutral point terminal member arranged to connect the neutral point busbar and the neutral point terminal to each other.