Motor and mounting method

Patent metadata

Field	Value
Publication number	US-11677280-B2
Application number	US-202117205080-A
Country	US
Kind code	B2
Filing date	Mar 18, 2021
Priority date	Mar 31, 2020
Publication date	Jun 13, 2023
Grant date	Jun 13, 2023

Abstract

A connection terminal includes a lower terminal portion, a bent portion, and an upper terminal portion. The bent portion extends radially inward from an upper end of the lower terminal portion. The upper terminal portion extends axially upward from a radially inner end of the bent portion. The upper terminal portion is located radially inside a radially inner end surface of a tooth. In a process of manufacturing a motor, a rotor main body is inserted into a radially inner side of a stator core, using a space defined radially inside the lower terminal portion.

First claim

What is claimed is:

1. A motor comprising:
a stator with a ring shape around a central axis extending up and down; and
a rotor located radially inside the stator and being rotatable about the central axis; wherein
the stator includes:
a stator core including a core back with a ring shape about the central axis, and teeth extending radially inward from the core back; and
a coil including a conducting wire wound around the teeth;

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 busbar assembly located axially above the stator core; wherein

the busbar assembly includes:
a conductor to which a lead wire extending axially upward from the coil is connected; and
a bus bar holder holding the conductor;

the conductor includes a connection terminal extending axially upward of the bus bar holder;
the connection terminal includes:
a lower terminal portion;
a bent portion extending radially inward from an upper end of the lower terminal portion; and
an upper terminal portion extending axially upward from a radially inner end of the bent portion;

the upper terminal portion is located radially inside radially inner end surfaces of the teeth; and
a total axial length from an upper end of the stator to an upper end of the lower terminal portion is longer than a total axial length of the rotor main body.

2. The motor according to claim 1 , wherein the upper terminal portion is located radially inside an outer peripheral surface of the rotor main body.

3. The motor according to claim 1 , wherein
the conductor includes a plurality of the connection terminals; and
the connection terminals are located within an area extending 180° about the central axis.

4. The motor according to claim 1 , further comprising:
a housing made of a resin to accommodate the stator core, the coil, and the rotor main body; wherein
the connection terminal extends upward of the housing through a lead bushing made of a resin and provided in the housing.

5. The motor according to claim 4 , wherein the bent portion is located below an upper end of the lead bushing.

6. The motor according to claim 4 , further comprising:
a bearing axially above the rotor main body;
the bearing supporting the shaft in a rotatable manner relative to the housing; wherein
the housing includes a bearing holding portion holding the bearing; and
the bearing holding portion is radially opposite to the lower terminal portion.

7. A mounting method of mounting a rotor including a shaft and a rotor main body to a stator core and a busbar assembly located axially above the stator core, in a process of manufacturing a motor, the mounting method comprising:
a) moving the rotor in a direction intersecting with an axial direction such that a central axis of the stator core is aligned with a central axis of the rotor at a position axially above the stator core; and
b) moving the rotor axially downward to insert the rotor main body into a radially inner side of the stator core; wherein
the busbar assembly includes a connection terminal extending therefrom and including:
a lower terminal portion;
a bent portion extending radially inward from an upper end of the lower terminal portion; and
an upper terminal portion extending axially upward from a radially inner end of the bent portion;

the moving the rotor in the direction intersecting with the axial direction includes moving the rotor main body in a direction of the lower terminal portion at an axial position equal to or substantially equal to an axial position of the lower terminal portion; and
a total axial length from an upper end of the stator to an upper end of the lower terminal portion is longer than a total axial length of the rotor main body.

Assignees

• Nidec Corp

Inventors

• Takahashi Shunsuke
• Migita Takayuki
• Okada Takumi

Classifications

• H02K5/15

  Mounting arrangements for bearing-shields or end plates · CPC title

• H02K2203/09

  Machines characterised by wiring elements other than wires, e.g. bus rings, for connecting the winding terminations · CPC title

• H02K13/02

  Connections between slip-rings and windings · CPC title

• H02K1/145 Primary

  having an annular coil, e.g. of the claw-pole type · CPC title

• H02K3/522 Primary

  for generally annular cores with salient poles · CPC title