Motor

Patent metadata

Field	Value
Publication number	US-10873237-B2
Application number	US-201916448034-A
Country	US
Kind code	B2
Filing date	Jun 21, 2019
Priority date	Aug 22, 2018
Publication date	Dec 22, 2020
Grant date	Dec 22, 2020

Abstract

A motor includes a stationary portion, a rotating portion that includes a shaft rotating about a vertically extending central axis, and a bearing portion that rotatably supports the shaft with respect to the stationary portion. The stationary portion includes a cylindrical bearing housing portion that holds the bearing portion, a stator that is radially outward of the bearing housing portion and includes a stator core, a circuit board that is below the stator core, and an annular spacer that is between the stator core and the bearing housing portion. The spacer includes multiple side wall portions that contact a radially inner surface of the stator core and a flange portion that protrudes radially outward more than the side wall portion and contacts a lower surface of the stator core.

First claim

What is claimed is:

1. A motor comprising:
a stationary portion;
a rotating portion that includes a shaft rotating about a vertically extending central axis; and
a bearing portion that rotatably supports the shaft with respect to the stationary portion; wherein
the stationary portion includes:
a cylindrical bearing housing portion that holds the bearing portion;
a stator that is radially outward of the bearing housing portion and includes a stator core;
a circuit board that is below the stator core; and
an annular spacer that is between the stator core and the bearing housing portion;

the spacer includes:
a plurality of side wall portions that contact a radially inner surface of the stator core;
a flange portion that protrudes radially outward more than the side wall portion and contacts a lower surface of the stator core; and
a plurality of spacer protrusions that protrude radially inward from a radially inner surface of the side wall portion or the flange portion, and are juxtaposed in a circumferential direction; and

the spacer protrusion contacts a radially outer surface of the bearing housing portion.

2. The motor according to claim 1 , wherein
the stator core includes a stator protrusion that protrudes to a space between the side wall portions adjacent to each other from a radially inner surface of the stator core; and
the stator protrusion contacts a radially outer surface of the bearing housing portion.

3. The motor according to claim 2 , wherein the bearing housing portion is press-fitted into the stator protrusion.

4. The motor according to claim 2 , wherein a plurality of the stator protrusions are arranged at equal or substantially equal intervals in the circumferential direction.

5. The motor according to claim 1 , wherein
the circuit board includes a through hole through which the bearing housing portion passes; and
the spacer includes an engagement claw that protrudes downward and engages with a periphery of the through hole.

6. The motor according to claim 1 , wherein the spacer protrusion extends linearly in an axial direction.

7. The motor according to claim 1 , wherein
the bearing housing portion includes a housing protrusion that protrudes radially outward from a radially outer surface of the bearing housing portion; and
the housing protrusion and the spacer protrusion come into contact with each other.

8. The motor according to claim 1 , wherein
the shaft protrudes below a lower end of the bearing housing portion;
the bearing portion includes an upper bearing portion and a lower bearing portion below the upper bearing portion; and
a lower end of the spacer protrusion is above an upper end of the lower bearing portion.

9. The motor according to claim 1 , wherein
the stationary portion includes a base portion that extends radially from a lower portion of the bearing housing portion;
the circuit board is sandwiched between a base projection protruding from an upper surface of the base portion, and the flange portion; and
a lower end of the spacer and an upper surface of the base portion face each other in an axial direction with a gap interposed therebetween.

10. The motor according to claim 1 , wherein the spacer protrusions are arranged at equal or substantially equal intervals in the circumferential direction.

Assignees

• Nidec Corp

Inventors

• Takemoto Shinji
• Furukawa Keizo
• Hirokawa Tsuyoshi

Classifications

• H02K1/2791

  Surface mounted magnets; Inset magnets · CPC title

• H02K5/16 Primary

  Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields (magnetic bearings H02K7/09) · CPC title

• H02K1/14

  Stator cores with salient poles · CPC title

• H02K5/225 Primary

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

• H02K11/33

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