Motor housing thermal sensing

摘要

A motor driven compressor apparatus includes a first stage compressor, a second stage compressor, an electric motor disposed between and coupled to the first stage compressor and the second stage compressor, thermal sensors disposed on the electric motor and configured to externally measure internal temperatures of the electric motor or internal bearings or components, and an external controller coupled to the electric motor and to the thermal sensors, and configured to at least one of slow down a speed of the electric motor and shut down the electric motor in response to at least one of an excess of a predetermined internal temperature and a rate of internal temperature change.

主权项

1. A motor driven compressor apparatus, comprising:
a first stage compressor; a second stage compressor; an electric motor disposed between and coupled to the first stage compressor and the second stage compressor; thermal sensors disposed in a depression of a housing of the electric motor and configured to externally measure internal temperatures of the electric motor or internal bearings or components, wherein the thermal sensors further comprise sensor pads disposed in the depression, each sensor pad has a forward end and a lead end that is coupled to a lead line, wherein the depression is radially aligned with the internal bearings, an external controller coupled to the electric motor and to the thermal sensors, and configured to slow down a speed of the electric motor or shut down the electric motor in response to the thermal sensors measuring an internal temperature in excess of a predetermined temperature or when the internal temperature increases at a rate in excess of a predetermined rate, wherein the sensor pads are coupled to the housing with thermal epoxy, wherein the thermal epoxy includes first and second portions per sensor pad, wherein the first portion affixes the lead end to a surface of the depression, wherein the second portion affixes the forward end to the surface of the depression.