Patent ID: 6346810
Filing Date: 2002-02-12
Classification: B82Y,G01K,G01R

Abstract:
An electric motor system comprising:an electric motor having stator laminations; a plurality of sensors located at spaced locations in the stator laminations, each of said sensors comprising: giant magnetoresistive means for contacting said stator laminations thereby to be subjected to the magnetic field and temperature of said stator laminations; optical means in contact with said giant magnetoresistive means for coupling energy emanating therefrom; first processing means connected to said optical means for generating a temperature signal indicative of the temperature of said stator laminations; second processing means connected to said optical means for generating a magnetic field strength signal indicative of the magnetic field strength in said stator laminations; motor control means located remotely from said electric motor for controlling the energization of said electric motor in response to the signals from said first and second processing means; and cable means interconnecting said sensors and said motor control means.