Motor

Patent metadata

Field	Value
Publication number	US-2017201147-A1
Application number	US-201715472320-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 motor includes a rotor, a stator, a housing, a bus bar assembly, a cover fixed to the housing, and a circuit board. The bus bar assembly includes a bus bar, a wiring member, and a bus bar holder. The bus bar holder includes a main body portion, a connector portion, and a connection terminal holding portion. The cover directly or indirectly contacts a second side of the main body portion. The wiring member includes a circuit board connection terminal fixed to the connection terminal holding portion at a first side ahead of the end of the second side of the main body portion, and the end of the second side at the radially inner surface of the connection terminal holding portion is located at the first side ahead of the surface of the second side of the circuit board.

First claim

What is claimed is:

1 . A motor, comprising:
a rotor including a shaft with a center 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; a cover fixed to the housing to cover at least a portion of a second side of the bus bar assembly; and a circuit board disposed between the second bearing and the cover in the one direction; wherein the bus bar assembly includes:
a bus bar electrically connected to the stator;
a wiring member electrically connecting an external power supply to the circuit board; and
a bus bar holder that holds the bus bar and the wiring member;
the bus bar holder includes:
a cylindrical main body portion including an opening at the second side;
a connector portion that protrudes from the main body portion toward a radially outer side of the center axis; and
a connection terminal holding portion that protrudes from an inner surface of the main body portion, and allows at least a portion of the connection terminal holding portion to overlap with the connector portion in the radial direction;
the cover directly or indirectly contacts a surface of a second side of the main body portion over a circumference of the opening; the wiring member includes:
an external power-supply connection terminal provided in the connector portion to be electrically connected to the external power-supply; and
a circuit board connection terminal fixed to the connection terminal holding portion at the first side ahead of an end of the second side of the main body portion so that the circuit board connection terminal is electrically connected to the circuit board; and
an end of the second side in a radially inner surface of the connection terminal holding portion is located at the first side ahead of the surface of the second side of the circuit board.

2 . The motor of claim 1 , wherein the circuit board connection terminal protrudes from a front end of a radially inner side of the connection terminal holding portion.

3 . The motor of claim 2 , wherein the circuit board connection terminal protrudes from a surface of the radially inner side of the connection terminal holding portion.

4 . The motor of claim 1 , wherein the end of the second side of the connection terminal holding portion is located at the first side ahead of the surface of the second side of the circuit board.

5 . The motor of claim 1 , wherein the surface of the second side of the circuit board is located at the second side of the main body portion.

6 . The motor of claim 1 , wherein the surface of the second side of the connection terminal holding portion is located at the first side ahead of the surface of the second side of the main body portion.

7 . The motor of claim 1 , wherein the surface of the second side of the connection terminal holding portion and the surface of the second side of the main body portion are located at a same position in the one direction.

8 . The motor of claim 1 , wherein:
the bus bar includes a coil connection portion which protrudes from the inner surface of the main body portion and is electrically connected to a coil of the stator; and the end of the second side of the coil connection portion is located at the second side of the first side of the circuit board.

9 . The motor of claim 1 , wherein:
the bus bar includes a coil connection portion which protrudes from the inner surface of the main body portion and is electrically connected to a coil of the stator; and at least a portion of the coil connection portion overlaps with the circuit board in the radial direction.

10 . The motor of claim 8 , wherein the circuit board connection terminal and the coil connection portion are located at different positions in a circumferential direction of the center axis.

11 . The motor of claim 1 , wherein:
the circuit board connection terminal includes a plate-shaped portion; the plate-shaped portion includes a connection surface parallel or substantially parallel to the surface of the second side of the circuit board; and the connection surface is in contact with the surface of the second side of the circuit board.

12 . The motor of claim 1 , wherein the surface of the second side of the connection terminal holding portion is provided with a rib.

Assignees

• Nidec Corp

Inventors

• Haga Hidehiro
• Sato Ryusuke
• Sonoda Masashi

Classifications

• H02K5/1732

  radially supporting the rotary shaft at both ends of the rotor (H02K5/1737 takes precedence) · CPC title

• H02K11/33

  Drive circuits, e.g. power electronics (H02K11/38 takes precedence) · CPC title

• H02K5/225 Primary

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

• H02K3/50

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

• H02K3/28

  Layout of windings or of connections between windings (windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32) · CPC title