High frequency (HF) signal injection scheme is widely used to estimate the initial rotor position of Interior Permanent Magnet Synchronous Motors (IPMSM). The accuracy of the estimated rotor position, however, may be degraded by the phase delay caused by pulse width modulation (PWM), digital filters in signal demodulation process, non- ideality of inverter, and so on. To solve this problem, the main factors contributing to the estimation error are analyzed, and a unified compensation algorithm is proposed. In the analysis, an interesting phenomenon is exposed, i.e. the resultant phase shifts in the positive- and negative-sequence HF currents are the same in magnitude. In the algorithm, the phase shift in the positive- sequence HF currents is extracted and used to compensate error in the estimated rotor position, improving the accuracy of estimation. The effectiveness of this proposed error compensation algorithm is confirmed through simulation and experiments.
Analysis and compensation of the error in initial rotor position of IPMSM estimated with HF signal injection
01.08.2017
745843 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Position and speed sensorless control for IPMSM based on estimation of position error
Online Contents | 2003
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