Analog Devices International Unlimited Company

Adam James Glibbery

Javier Calpe Maravilla

Christopher Peter Hurrell

Italo Carlos Medina Sánchez Castro

Systems and methods for extracting motor operational state parameters from an electric motor for improved motor control and motor fault or failure detection are discussed. An exemplary system includes an excitation circuit to apply a drive voltage to an electric motor, and a processor circuit to measure a resulting winding current, extract a current waveform by oversampling the winding current in an entire PWM frame at a sampling rate higher than the PWM frequency, and fit the current waveform in the PWM period to a parametric model. The processor circuit can determine a motor operational state parameter using one or more of the applied drive voltage or the parametric model of the winding current.

Systems and methods for motor parameter extraction

A switched-capacitor integrator is described having the contribution to offset from the charge injection mismatch of switches connected to the summing nodes mitigated by using a switching scheme that conveys basically all the charge injection to the output, thus preventing net offset from being integrated.

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Paterna, Spain

Adam James Glibbery