IDENTIFICATION OF CURRENT GAIN ERRORS AND RESISTANCE IMBALANCE IN FEEDBACK CURRENT-CONTROLLED SYNCHRONOUS MOTOR DRIVE SYSTEMS
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United States of America Patent
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Issued Date -
Apr 10, 2025
app pub date -
Oct 10, 2023
filing date -
Oct 10, 2023
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Abstract
A method for detecting and distinguishing a current measurement gain error and a resistance imbalance in a motor drive system includes: determining a first voltage command signal, a first motor position signal, and a first quadrature-axis current command when the motor is rotating at a first speed; computing, based on the first voltage command and motor position signals, a first demodulated voltage signal; determining a second voltage command signal, a second motor position signal, and a second quadrature-axis current command while the motor is rotating at a second speed that is different than the first speed; computing, based on the second voltage command and the motor position signals, a second demodulated voltage signal; and computing a resistance imbalance flag indicating a resistance imbalance and a current gain error flag indicating a current sensing gain error.
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