Stator resistance adaptation in sensorless PMSM drives

摘要

A method of estimating stator resistance of a permanent magnet synchronous machine, when the permanent magnet synchronous machine is controlled with an inverter using a control system having an adaptive observer which is augmented with a signal injection, the adaptive observer having a stator resistance estimate ({circumflex over (R)}_s) as a parameter, in which method an error signal (ε) is obtained from the signal injection, a speed correction term (ω_ε) is calculated from the error signal (ε), the rotor position estimate is corrected using the speed correction term (ω_ε) in the adaptive observer, whereby the error signal (ε) is driven to zero. The method comprises the step of correcting the value of the stator resistance estimate ({circumflex over (R)}_s) in the adaptive observer when the speed correction term (ω_ε) differs from zero.