Motor

Patent metadata

Field	Value
Publication number	US-2017201149-A1
Application number	US-201715472322-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 bus bar holder with a main body portion, a connector portion protruding from the main body portion toward a radially outer side, and a connection terminal holding portion protruding from the main body inner surface toward a radially inner side. The main body portion is provided with a seal portion directly or indirectly contacting the cover along a circumferential direction of a center axis. A rib protruding toward a second side ahead of a circuit board is disposed at a surface of a second side of the connection terminal holding portion.

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 the second side of the bus bar assembly; and a circuit board disposed between the second bearing and the cover in the one direction, and allowing a surface of the second side to cross 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 connection terminal;
the bus bar holder includes:
a cylindrical main body portion including an opening at the second side;
a connector portion protruding from the main body portion toward a radially outer side of the center axis; and
a connection terminal holding portion protruding from an inner surface of the main body portion toward a radially inner side, such that at least a portion of the connection terminal holding portion overlaps with the connector portion in a radial direction;
the main body portion is provided with a seal portion directly or indirectly contacting the cover along a circumferential direction 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 which is fixed to the connection terminal holding portion at the first side ahead of an end of the second side of the main body portion and is electrically connected to the circuit board; and
the surface of the second side of the connection terminal holding portion is provided with a rib protruding toward the second side ahead of the circuit board.

2 . The motor according to claim 1 , wherein the rib is connected to the inner surface of the main body portion.

3 . The motor according to claim 1 , wherein the rib extends in a direction crossing a protrusion direction of the connector portion.

4 . The motor according to claim 1 , wherein the rib extends in a direction parallel or substantially parallel to a protrusion direction of the connector portion.

5 . The motor according to claim 1 , wherein the rib is spaced apart from an end of the radially inner side of the connection terminal holding portion toward the radially outer side.

6 . The motor according to claim 1 , wherein the rib includes a plurality of ribs.

7 . The motor according to claim 6 , wherein the plurality of ribs are arranged in the radial direction; and
in ones of the plurality of the ribs neighboring each other, an end of the second side of the rib located at the radially inner side is located at the first side ahead of the end of the second side of the rib located at the radially outer side.

8 . The motor according to claim 1 , wherein in the one direction, a position of the end of the second side of the rib is shifted to the first side as a distance to the radially inner side is reduced.

9 . The motor according to claim 1 , wherein the main body portion includes a connector connection portion connected to the connector portion;
the bus bar holder contacts the end of the second side of the stator; and a gap is defined between the connector connection portion and the housing in the one direction.

10 . The motor according to 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 in the one direction.

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

12 . The motor according to claim 1 , wherein
the bus bar includes a coil connection portion that 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.

13 . The motor according to claim 1 , wherein
the bus bar includes a coil connection portion that protrudes from the inner surface of the main body portion and is electrically connected to a coil of the stator; and the connection terminal and the coil connection portion are located at different positions in a circumferential direction of the center axis.

14 . The motor according to 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 contacts the surface of the second side of the circuit board.

Assignees

• Nidec Corp

Inventors

• Haga Hidehiro
• Sato Ryusuke

Classifications

• H02K7/083

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

• H02K11/21

  Devices for sensing speed or position, or actuated thereby (specially adapted for machines having non-mechanical commutating devices H02K29/06, H02K29/14) · 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

• H02K5/225 Primary

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