Motor and method for manufacturing motor

Patent metadata

Field	Value
Publication number	US-10291095-B2
Application number	US-201715479894-A
Country	US
Kind code	B2
Filing date	Apr 5, 2017
Priority date	Apr 13, 2016
Publication date	May 14, 2019
Grant date	May 14, 2019

Abstract

A motor includes a stator including a terminal and a casing that houses the stator, in which the casing includes a casing body with high thermal conductivity that includes an opening in which the terminal is disposed and houses the stator and a casing block disposed in the opening and with an insulating property and high thermal conductivity, and the casing block includes a housing part that houses a distal end portion of the terminal.

First claim

What is claimed is:

1. A motor comprising:
a stator comprising a terminal; and
a casing that houses the stator,
wherein the terminal has a rear end portion connected to a stator coil and a distal end portion opposite the rear end portion, and the terminal transmits heat from the stator to the casing,
wherein the casing comprises:
a casing body housing the stator, wherein the casing body comprises a material having a coefficient of thermal conductivity of at least 1 W/m·k, and further comprises an opening in which the distal end portion of the terminal is disposed, and
a casing block disposed in the opening and having an insulating property wherein the casing block comprises a material having a coefficient of thermal conductivity of at least 1 W/m·k, and

the casing block comprises a housing part that houses the distal end portion of the terminal wherein heat is transmitted from the stator coil to the casing block via the terminal and to the casing body via the casing block.

2. The motor according to claim 1 ,
wherein a flexible material is used for the casing block,
the casing block is greater in size than the opening, and
the casing block is press-fitted into the opening.

3. The motor according to claim 1 ,
wherein the casing block is smaller in size than the opening, and
a gap between the casing block and the opening is filled with a member with high thermal conductivity.

4. The motor according to claim 1 ,
wherein the housing part is smaller in size than the distal end portion of the terminal, and
the distal end portion of the terminal is press-fitted into the housing part.

5. The motor according to claim 1 ,
wherein the housing part is greater in size than the distal end portion of the terminal, and
a gap between the housing part and the distal end portion of the terminal is filled with a member with high thermal conductivity.

6. The motor according to claim 1 ,
wherein the stator comprises a cylindrical stator core,
the terminal comprises:
the distal end portion;
the rear end portion on an opposite side of the distal end portion; and
a bridge part that bridges the distal end portion and the rear end portion, and

the bridge part has an arc shape along an end face of the stator core.

7. The motor according to claim 6 , further comprising:
two of the terminals disposed separate from each other; and
one short terminal that constitutes a portion similar to the rear end portion of the terminal,
wherein the two terminals are disposed so that the rear end portion is located on a same side of the stator, and
the short terminal is separate from the two terminals and provided so as to be located between the rear end portions of the two terminals.

8. The motor according to claim 1 , further comprising at least one temperature sensor,
wherein the temperature sensor is attached to the terminal.

9. The motor according to claim 1 , wherein the housing part is a bottomed concave part comprising an insertion port for the distal end portion of the terminal inside the casing.

10. A method for manufacturing the motor according to claim 1 , the method comprising:
an arranging step of arranging the stator core in a metal die, causing the metal die to hold a frame of a lead frame comprising (i) a terminal part and (ii) a frame that holds the terminal part and arranging the lead frame in the metal die;
a molding step of supplying an insulator material to the metal die, insulating a portion that becomes a terminal of the terminal part from the stator core and molding an insulator that integrates the terminal and the stator core; and
a cutting step of cutting the terminal part so as to form the distal end portion of the terminal housed in the housing part of the casing block.

Assignees

• Minebea Mitsumi Inc

Inventors

• Ohmura Jun
• Otsuka Makoto

Classifications

• H02K9/22

  by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges · CPC title

• H02K15/10

  Applying solid insulation to windings, stators or rotors, e.g. applying insulating tapes · CPC title

• H02K5/225 Primary

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

• H02K5/08

  Insulating casings · CPC title

• H02K5/04 Primary

  Casings or enclosures characterised by the shape, form or construction thereof · CPC title