Multiple speed motor with thermal overload protection

Patent metadata

Field	Value
Publication number	US-2016352191-A1
Application number	US-201615231320-A
Country	US
Kind code	A1
Filing date	Aug 8, 2016
Priority date	Mar 15, 2013
Publication date	Dec 1, 2016
Grant date	—

Abstract

An electric motor includes a stator and a rotor. The stator has a plurality of low speed windings and a plurality of separate high speed windings. A first type of thermal overload protector is coupled with at least one of the low speed windings and a second type of thermal overload protector is coupled with at least one of the high speed windings.

First claim

1 . A motor assembly comprising:
a motor controller; and a three-phase electric motor driven by the motor controller and comprising:
a stator including a plurality of low speed three-phase windings and a plurality of separate high speed three-phase windings;
a rotor rotatably coupled with the stator;
a plurality of on-winding non-phenolic bimetal snap-action thermal overload protectors coupled with the low speed three-phase windings for protecting the low speed three-phase windings; and
a phenolic bimetal snap-action disc type thermal overload protector coupled with the high speed three-phase windings and configured to protect all three phases of the high speed three-phase windings, the phenolic bimetal snap-action disc type thermal overload protector being electrically isolated from the plurality of on-winding non-phenolic bimetal snap-action thermal overload protectors.

2 . The motor assembly of claim 1 , wherein the plurality of on-winding non-phenolic bimetal snap-action thermal overload protectors consists of two on-winding non-phenolic bimetal snap-action thermal overload protectors.

3 . The motor assembly of claim 1 , wherein the plurality of on-winding non-phenolic bimetal snap-action thermal overload protectors are configured to protect all three phases of the low speed three-phase windings.

4 . The motor assembly of claim 1 , further comprising a motor shell that at least partially encloses and protects the stator and the rotor, the motor shell having an end shield, wherein the on-winding non-phenolic bimetal snap-action thermal overload protectors are wired directly to the low speed windings and the second type of thermal overload protector is positioned outside the stator and in the end shield.

5 . The motor assembly of claim 1 , wherein the motor assembly is an HVAC blower motor assembly.

Assignees

• Nidec Motor Corp

Inventors

• Vehige Joseph A
• Wiegmann Alex V
• Bastien Ryan M

Classifications

• H02P29/64

  Controlling or determining the temperature of the winding · CPC title

• H02H7/0852

  directly responsive to abnormal temperature by using a temperature sensor (in a control circuit H02H7/0833) · CPC title

• H02K3/20

  for auxiliary purposes, e.g. damping or commutating · CPC title

• H02K11/25 Primary

  Devices for sensing temperature, or actuated thereby · CPC title

• H02K11/27

  Devices for sensing current, or actuated thereby (overcurrent protection responsive to temperature of the machines or parts thereof, e.g. windings, H02K11/25) · CPC title