Motor including bus bars and bus bar holder

Patent metadata

Field	Value
Publication number	US-10181766-B2
Application number	US-201715472323-A
Country	US
Kind code	B2
Filing date	Mar 29, 2017
Priority date	Sep 30, 2014
Publication date	Jan 15, 2019
Grant date	Jan 15, 2019

Abstract

A motor includes a rotor with a shaft, a stator, first and second bearings supporting the shaft, a bus bar assembly holding the second bearing, a circuit board, a sensor magnet fixed to the shaft, and a rotation sensor which is attached to the circuit board and faces a direction. The bus bar assembly includes a bus bar and a bus bar holder. The bus bar holder includes a cylindrical main body portion including an opening at a second side. 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. The end of the second side of the coil connection portion is located at a second side ahead of a surface of a first 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 toward both a first side and a second side;
a stator enclosing the rotor and rotating the rotor about the center axis;
a first bearing located at a first side of the stator in the one direction and supporting the shaft;
a second bearing located at a second side of the stator in the one direction opposite to the first side of the stator and supporting the shaft;
a cylindrical housing holding the stator and the first bearing;
a bus bar assembly holding the second bearing, and allowing an end of a first side of the bus bar assembly 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;
a circuit board disposed 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;
a sensor magnet directly or indirectly fixed to the shaft at a second side of the second bearing; and
a rotation sensor which is attached to the circuit board, and faces the sensor magnet 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 holding the bus bar and the wiring member;

the bus bar holder includes:
a cylindrical main body portion including an opening at a second side of the cylindrical main body portion; and
a connector portion protruding from the main body portion toward a radially outer side of the center axis;

the wiring member includes:
an external power-supply connection terminal provided to the connector portion to be electrically connected to the external power-supply; and
a circuit board connection terminal electrically connected to the circuit board;
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;

an end of a second side of the coil connection portion is located ahead of a surface of a first side of the circuit board toward the second side of the circuit board;
the bus bar holder includes a second bearing holding portion that holds the second bearing, and a connection portion that connects the main body portion to the second bearing holding portion;
the connection portion is located at a second side of the connection portion ahead of an end of a first side of the second bearing holding portion; and
at least a portion of the sensor magnet overlaps with the connection portion in a radial direction.

2. The motor of claim 1 , wherein at least a portion of the coil connection portion overlaps with the circuit board in the radial direction.

3. The motor of claim 1 , wherein at least a portion of the second bearing holding portion overlaps with the stator in the radial direction.

4. The motor of claim 1 , wherein the surface of the second side of the circuit board is perpendicular or substantially perpendicular to the one direction.

5. The motor of claim 1 , wherein the circuit board connection terminal and the coil connection portion are located at different positions in a circumferential direction of the center axis.

6. The motor of claim 1 , further comprising:
a sensor magnet holding portion attached to the shaft and holding the sensor magnet;
wherein
at least a portion of the sensor magnet holding portion overlaps with the second bearing in the radial direction.

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

Assignees

• Nidec Corp

Inventors

• Haga Hidehiro
• Sato Ryusuke
• Sonoda Masashi

Classifications

• H02K3/522 Primary

  for generally annular cores with salient poles · 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

• H02K11/215

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

• H02K5/225 Primary

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

• H02K2203/03

  Machines characterised by the wiring boards, i.e. printed circuit boards or similar structures for connecting the winding terminations · CPC title