Patent ID: 7199549

Claim:
A system for estimating a parameter of an electric machine, comprising: a controller operatively connected to a switching device, said switching device operatively connected between said electric machine and a power source, said switching device being coupled to said controller; a current sensing device operatively connected to said electric machine and said controller for providing a torque signal indicative of a measured torque for said electric machine; and said controller executing a parameter estimation process, said controller being receptive to said torque signal and a torque command indicative of a desired torque for said electric machine, said parameter estimation process includes, determining an estimated torque in response to said torque signal, determining a torque error by comparing said torque command signal with said estimated torque in a time coherent manner, and integrating said torque error to generate a parameter estimate, said parameter estimate representing a parameter of said electric machine, said integrating said torque error being disabled when a rate of change of said torque command signal exceeds a threshold.