Motor

Patent metadata

Field	Value
Publication number	US-11522415-B2
Application number	US-202117205072-A
Country	US
Kind code	B2
Filing date	Mar 18, 2021
Priority date	Mar 31, 2020
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

A motor includes a housing and a metal shield plate. The housing includes a bearing holder. The shield plate includes a shield plate main body and a protrusion that protrudes upward from the shield plate main body. The protrusion has a tubular shape. In manufacturing the motor, the protrusion of the shield plate is inserted into a through-hole in the bearing holder. A working deformation portion is then formed such that an upper end of the protrusion is deformed to contact an upper surface of the bearing holder.

First claim

What is claimed is:

1. A motor comprising:
a stator with a ring shape around a central axis extending up and down;
a rotor rotatably supported about the central axis; and
a housing accommodating the stator and the rotor; wherein
the rotor includes:
a shaft extending along the central axis; and
a rotor main body rotatable about the central axis in conjunction with the shaft;

the motor further includes:
a bearing axially above the rotor main body;
the bearing supporting the shaft in a rotatable manner relative to the housing; and
a shield plate made of a metal and located axially above the stator; wherein

the housing includes a bearing holder axially partitioning an inner side and an outer side of the housing and holding the bearing;
the bearing holder includes a through-hole axially penetrating therethrough;
the shield plate includes:
a shield plate main body located between the bearing holder and the stator;
the shield plate main body extending along a lower surface of the bearing holder; and
a protrusion having a tubular shape and protruding upward from the shield plate main body;

the protrusion being in the through-hole; and
the protrusion includes a working deformation portion that is in contact with an upper surface of the bearing holder.

2. The motor according to claim 1 , wherein
the protrusion includes a plurality of the working deformation portions around an upper end of the protrusion.

3. The motor according to claim 2 , wherein
the working deformation portions are positioned at equiangular spacings.

4. The motor according to claim 1 , wherein
the bearing holder includes a recess provided around an upper end of the through-hole and recessed axially downward in an upper surface of the bearing holder; and
the working deformation portion is at least partially accommodated in the recess.

5. The motor according to claim 4 , wherein
a length from a center line of the protrusion to an outer end of the working deformation portion is larger than a diameter of the through-hole, and is smaller than a length from the center line of the protrusion to an end surface intersecting with a bottom surface of the recess.

6. The motor according to claim 1 , wherein
the protrusion has a cylindrical shape.

7. The motor according to claim 1 , wherein
the protrusion includes:
a tubular portion with a tubular shape and extending axially; and
a top plate closing an upper side of the tubular portion; and

the working deformation portion includes an upper end of the tubular portion, the upper end being deformed outward.

Assignees

• Nidec Corp

Inventors

• Takahashi Shunsuke
• Migita Takayuki

Classifications

• H02K5/1732 Primary

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

• H02K7/083

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

• H02K11/026 Primary

  Suppressors associated with brushes, brush holders or their supports · CPC title

• H02K3/522

  for generally annular cores with salient poles · CPC title

• H02K11/215

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