Feedback parameter estimation for electric machines

A method for estimating a parameter of an electric machine, comprising:

• receiving a torque value indicative of a measured torque for said electric machine and a torque command indicative of a desired torque for said electric machine;
• and
• executing a parameter estimation process, 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.

A storage medium encoded with computer program code,

• said code comprising instructions for causing a controller to implement a method for estimating a parameter of an electric machine the method comprising:
• receiving a torque value indicative of a measured torque for said electric machine and a torque command indicative of a desired torque for said electric machine;
• and
• executing a parameter estimation process, 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.

A computer data signal embodied in a carrier wave, the computer data signal comprising:

• code configured to cause a controller to implement a method for estimating a parameter of an electric machine, the method comprising:
• receiving a torque value indicative of a measured torque for said electric machine and a torque command indicative of a desired torque for said electric machine;
• and
• executing a parameter estimation process, 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.