Motor

Patent metadata

Field	Value
Publication number	US-10923981-B2
Application number	US-201716316634-A
Country	US
Kind code	B2
Filing date	Aug 25, 2017
Priority date	Aug 26, 2016
Publication date	Feb 16, 2021
Grant date	Feb 16, 2021

Abstract

A motor includes a rotor including a shaft centered on a vertically extending center axis, a stator radially opposite to the rotor and including coils, a bearing supporting the shaft, and a bus bar unit on an upper side in an axial direction of the stator. The bus bar unit includes bus bars including a terminal portion connected to a lead wire drawn out from the coil and a bus bar holder holding the bus bars. The terminal portion includes a slit which extends axially downward and into which the lead wire is fitted. The width of the slit is narrower than the diameter of the lead wire.

First claim

The invention claimed is:

1. A motor comprising:
a rotor including a shaft centered on a vertically extending center axis;
a stator disposed radially opposite to the rotor and including a plurality of coils;
a bearing supporting the shaft;
a bus bar unit disposed on an upper side in an axial direction of the stator; and
a housing surrounding and fixing the stator; wherein
the bus bar unit includes:
a plurality of bus bars including a terminal portion connected to a lead wire drawn out from the coil; and
a bus bar holder holding the plurality of bus bars;

the terminal portion includes a slit which extends axially downward and into which the lead wire is fitted;
a width of the slit is narrower than a diameter of the lead wire;
the bus bar holder includes a protrusion protruding radially outside;
the housing includes a recess portion recessed radially outward or a radially penetrating hole portion or notch portion; and
at least a portion of the protrusion is fitted into the recess portion, the hole portion, or the notch portion.

2. The motor according to claim 1 , wherein
the lead wire extending in a radial direction is fitted into the slit; and
a circumferential width of the slit is narrower than the diameter of the lead wire.

3. The motor according to claim 1 , wherein
the housing includes a flange extending radially outward; and
a lower surface of the protrusion is in contact with an upper surface of the flange.

4. The motor according to claim 1 , wherein
the stator includes an annular stator core; and
the bus bar holder is in contact with an upper surface of the stator core.

5. The motor according to claim 4 , wherein
the housing includes a flange extending radially outward; and
the flange includes:
an extending portion extending in an axial direction on an outer circumference; and
a claw portion protruding radially inward from the extending portion and being in contact with an upper surface of the protrusion.

6. The motor according to claim 5 , wherein
the flange includes a pair of the extending portions disposed at intervals in a circumferential direction;
the housing includes the notch portion; and
the notch portion is a gap between the pair of extending portions.

7. The motor according to claim 1 , wherein
the stator includes an insulator disposed between the coil and a tooth around which a conductive wire defining the coil is wound; and
the insulator includes a lead wire holding portion that holds the lead wire.

8. The motor according to claim 1 , further comprising an intermediate member positioned between the stator and the bus bar holder, wherein
the intermediate member includes a lead wire holding portion that holds the lead wire.

9. The motor according to claim 8 , wherein the stator includes:
a plurality of teeth around which a conductive wire defining the coil is wound, and which are arranged in a circumferential direction; and
an annular core back located radially outside of the plurality of teeth;
 the core back includes a groove portion recessed radially outward and axially extending on a circumferential surface;
 the intermediate member includes:
an annular portion provided with the lead wire holding portion on an upper surface thereof; and
a rib protruding radially inward from a circumferential surface of the annular portion and protruding downward from an axially lower end of the annular portion; and the rib is fitted into the groove portion.

10. The motor according to claim 8 , wherein the intermediate member includes a first overhanging portion protruding radially inward in a circumferential position where the lead wire holding portion is provided.

11. The motor according to claim 8 , wherein
the lead wire holding portion holds a plurality of the lead wires; and
the intermediate member includes a second overhanging portion protruding radially inward from the lead wire holding portion.

12. The motor according to claim 11 , wherein
the lead wire holding portion includes a wall portion separating the plurality of lead wires from each other; and
the second overhanging portion is located radially inside of the wall portion.

Assignees

• Nidec Corp

Inventors

• Yamaguchi Yuhei
• Sato Ryusuke
• Fujihara Hisashi
• Nakamura Keigo

Classifications

• H02K2203/09

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

• H02K5/225

  Terminal boxes or connection arrangements (specially adapted for submersible motors H02K5/132) · CPC title

• H02K5/1735

  radially supporting the rotary shaft at only one end of the rotor (H02K5/1737 takes precedence) · CPC title

• H02K3/522 Primary

  for generally annular cores with salient poles · CPC title

• H02K3/50

  Fastening of winding heads, equalising connectors, or connections thereto · CPC title