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Reliable rotor position/speed estimation is one of the key issues in the position/speed sensorless control of permanent-magnet synchronous machines (PMSM). In this paper, a quasi-sliding-mode observer (QSMO) with an online observer parameter adaption scheme is employed to estimate the extended electromotive force of a salient-pole PMSM. Due to machine parameter variations, inverter nonlinearities...
This paper presents an extended electromotive-force-based discrete-time sliding-mode observer (DSMO) for rotor position/speed sensorless control of interior permanent-magnet synchronous machines (IPMSMs). Without using voltage sensors to measure IPMSM terminal voltages, the reference voltages generated by the vector control system are used as inputs for the DSMO. However, due to the inverter dead-time...
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