Motor

Patent metadata

Field	Value
Publication number	US-2017201152-A1
Application number	US-201715472349-A
Country	US
Kind code	A1
Filing date	Mar 29, 2017
Priority date	Sep 30, 2014
Publication date	Jul 13, 2017
Grant date	—

Abstract

A bus bar holder of a motor includes a main body portion, and a connector portion protruding from the main body portion toward a radially outer side and located at a rear side of an axial direction ahead of a housing. The bus bar holder is provided with a seal portion directly or indirectly contacting a cover along a circumferential direction of a center axis. The connector portion includes a connector connection portion that connects the main body portion of the bus bar holder to the connector main body portion. At least a portion of the surface of a front side of an axial direction of the connector connection portion is located at a front side ahead of the seal portion at a radially outer side of the seal portion.

First claim

What is claimed is:

1 . A motor, comprising:
a rotor including a shaft which is centered on a center axis extending in one direction; a stator enclosing the rotor and rotating the rotor about the center axis; a first bearing located at a first side in the one direction of the stator and supporting the shaft; a second bearing located at a second side opposite to the first side of the stator and supporting the shaft; and a cylindrical housing holding the stator and the first bearing; a bus bar assembly holding the second bearing, and allowing an end of the first side to be located in the housing; and a cover fixed to the housing to cover at least a portion of a second side of the bus bar assembly; wherein the bus bar assembly includes:
a bus bar electrically connected to the stator; and
a bus bar holder holding the bus bar;
the bus bar holder includes:
a cylindrical main body portion including an opening at the second side; and
a connector portion protruding from the main body portion toward a radially outer side of the center axis, and located at the second side ahead of the housing;
the bus bar holder is provided with a seal portion directly or indirectly contacting the cover along a circumferential direction of the center axis; the connector portion includes:
a connector connection portion connected to the main body portion; and
a connector main body portion disposed at a radially outer side ahead of the connector connection portion; and
at least a portion of a surface of a second side of the connector connection portion is located at the first side ahead of the seal portion at the radially outer side ahead of the seal portion.

2 . The motor according to claim 1 , wherein
the seal portion is provided to the main body portion; and an entire surface of the second side of the connector connection portion is exposed in a direction from the second side to the first side.

3 . The motor according to claim 1 , wherein the seal portion is provided at a surface of a second side of the main body portion.

4 . The motor according to claim 1 , wherein
the seal portion is provided at an inner surface of the main body portion; and the cover includes an insertion portion that is inserted into the main body portion and directly or indirectly contacts the seal portion.

5 . The motor according to claim 1 , wherein an entire surface of the second side of the connector connection portion is located at the first side ahead of the seal portion.

6 . The motor according to claim 1 , wherein the surface of the second side of the connector connection portion includes a concave portion which is concaved toward the first side.

7 . The motor according to claim 1 , wherein:
the bus bar holder contacts an end of a second side of the stator; and a gap is provided between the connector portion and the housing in the one direction.

8 . The motor according to claim 1 , wherein:
the cover includes a cover flange portion at an end of the first side; the housing includes a housing flange portion at an end of the second side; and the cover flange portion is fixed to the housing flange portion.

9 . The motor according to claim 1 , further comprising:
a circuit board positioned between the second bearing and the cover in the one direction, and allowing a surface of a second side of the circuit board to cross the one direction; wherein the bus bar assembly includes a wiring member that electrically connects an external power supply to the circuit board; wherein the wiring member includes a circuit board connection terminal electrically connected to the circuit board; and the bus bar includes a coil connection portion that protrudes from an inner surface of the main body portion and is electrically connected to a coil of the stator.

10 . The motor according to claim 9 , wherein
an end of a second side of the coil connection portion is located at the second side ahead of the first side of the circuit board.

11 . The motor according to claim 9 , wherein at least a portion of the coil connection portion overlaps with the circuit board in a radial direction.

12 . The motor according to claim 9 , wherein the circuit board connection terminal and the coil connection portion are located at different positions in a circumferential direction of the center axis.

13 . The motor according to claim 9 , wherein
the circuit board connection terminal includes a plate-shaped portion; the plate-shaped portion includes a connection surface parallel or substantially parallel to a surface of the second side of the circuit board; and the connection surface contacts the surface of the second side of the circuit board.

Assignees

• Nidec Corp

Inventors

• Haga Hidehiro
• Sato Ryusuke

Classifications

• H02K11/20

  for measuring, monitoring, testing, protecting or switching (rectifiers H02K11/04; power electronics H02K11/33) · CPC title

• H02K2211/03

  Machines characterised by circuit boards, e.g. pcb · CPC title

• H02K11/215

  Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements · CPC title

• H02K5/10 Primary

  with arrangements for protection from ingress, e.g. water or fingers · CPC title

• H02K7/083

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