Electric pump apparatus

Patent metadata

Field	Value
Publication number	US-2020106321-A1
Application number	US-201916574242-A
Country	US
Kind code	A1
Filing date	Sep 18, 2019
Priority date	Sep 28, 2018
Publication date	Apr 2, 2020
Grant date	—

Abstract

An electric pump apparatus includes a motor, an inverter board, a coil support, a housing, and a pump portion driven by the motor. Coils include first end portions and second end portions drawn out from the coils, the first end portion and the second end portion defining both end portions of each of conducting wires of the coils. The inverter board is on a first axial side of the motor. The coil support includes a neutral point busbar that electrically connects the coils to one another. The coil support includes a first region including the first end portions arranged therein, each first end portion being directly connected to the inverter board, and a second region including the second end portions and the neutral point busbar arranged therein, each second end portion being connected to the neutral point busbar.

First claim

What is claimed is:

1 . An electric pump apparatus comprising:
a motor; an inverter board electrically connected to the motor; a coil support between the motor and the inverter board; a housing that houses the motor, the inverter board, and the coil support; and a pump portion driven by power of the motor; wherein the motor includes:
a rotor including a shaft that extends along a central axis; and
a stator radially opposite to the rotor;
the stator includes a plurality of coils; the plurality of coils include first end portions and second end portions drawn out from the coils, the first end portion and the second end portion defining both end portions of each of conducting wires of the plurality of coils; the inverter board is on a first axial side of the motor; the coil support includes a neutral point busbar that electrically connects the plurality of coils to one another; and the coil support includes:
a first region including the first end portions disposed therein, each first end portion being directly connected to the inverter board; and
a second region including the second end portions and the neutral point busbar disposed therein, each second end portion being connected to the neutral point busbar.

2 . The electric pump apparatus according to claim 1 , wherein
the coil support includes:
a first wall portion in the first region, and including principal surfaces facing in an axial direction; and
a second wall portion in the second region, and including principal surfaces facing in the axial direction;
the first wall portion includes a coil end insert hole that passes through the first wall portion in the axial direction, and includes the first end portion inserted therethrough; and an axial position of the first wall portion is on the first axial side of an axial position of the second wall portion.

3 . The electric pump apparatus according to claim 2 , wherein a junction of the neutral point busbar with each second end portion is on a second axial side of one of the principal surfaces of the first wall portion which faces to the first axial side, and on the first axial side of one of the principal surfaces of the second wall portion which faces to the first axial side.

4 . The electric pump apparatus according to claim 2 , wherein
the first wall portion includes a window portion that passes through the first wall portion in the axial direction; at least one of the first end portions includes a routed portion on a second axial side of the first wall portion; and the window portion overlaps with the routed portion of at least one of the first end portions when viewed in the axial direction.

5 . The electric pump apparatus according to claim 4 , wherein the routed portions of two or more of the first end portions overlap with each other in the window portion when viewed in the axial direction.

6 . The electric pump apparatus according to claim 1 , wherein at least one of the first end portions includes:
a first extending portion that extends from the coil to the first axial side; a second extending portion that extends in the axial direction, and is connected to the inverter board; and a third extending portion that joins an end of the first extending portion on the first axial side and an end of the second extending portion on a second axial side to each other, and that extends in a direction that is not parallel to the central axis.

7 . The electric pump apparatus according to claim 6 , wherein a length of the third extending portion is longer than a length of a portion of the second extending portion that extends between the inverter board and the third extending portion.

8 . The electric pump apparatus according to claim 6 , wherein
the plurality of coils include:
a first coil including a first conducting wire; and
a second coil including a second conducting wire different from the first conducting wire;
the third extending portion of the first coil and the third extending portion of the second coil overlap with each other when viewed in the axial direction; and the third extending portion of the first coil and the third extending portion of the second coil are spaced apart from each other in the axial direction.

9 . The electric pump apparatus according to claim 1 , wherein
the motor includes a bearing that rotatably supports the shaft; the housing includes an inverter housing portion that houses the inverter board; the inverter housing portion includes a coil support housing space that houses the coil support; the coil support is disposed in the coil support housing space; and the coil support housing space, the coil support, and the bearing overlap with one another when viewed in a radial direction.

10 . The electric pump apparatus according to claim 1 , wherein
the coil support includes a first wall portion in the first region, and principal surfaces facing in an axial direction; and the first wall portion includes:
a coil end insert hole that passes through the first wall portion in the axial direction, and includes the corresponding first end portion inserted therethrough; and
an extension tubular portion, extending to the first axial side from one of the principal surfaces of the first wall portion which faces to the first axial side, and defining a portion of the coil end insert hole therein.

11 . The electric pump apparatus according to claim 10 , wherein
the housing includes an inverter housing portion that houses the inverter board; the inverter housing portion includes a bottom wall portion opposite to one of a pair of principal surfaces of the inverter board which faces to a second axial side; and the bottom wall portion includes a tubular portion arrangement hole that passes through the bottom wall portion in the axial direction, and houses the extension tubular portion therein.

Assignees

• Nidec Corp
• Nidec Tosok Corp

Inventors

• Homma Kazuhiro
• Sakata Tomohiro
• Maeda Susumu
• Aono Masato
• Hattori Takashi

Classifications

• F04B17/03

  driven by electric motors · CPC title

• F04B53/16

  Casings; Cylinders; Cylinder liners or heads; Fluid connections · CPC title

• H02K11/33 Primary

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

• H02K2211/03

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

• H02K3/522 Primary

  for generally annular cores with salient poles · CPC title