Two Sliding Mode Based Observers for Sensorless Control of PMSM Drives
This paper develops two sliding mode-based observers for sensorless control of permanent magnet synchronous motor (PMSM) drives. These observers estimate the rotor position and speed from the stator currents and the DC-link voltage measurements. The first observer uses the α stator reference, while the second observer uses an estimated dq^ rotor reference. Both observer structures have two main parts. The first part is a sliding mode-based observer that uses the equivalent control to estimate a disturbance term containing information on the position and speed. The second part is a specific observer used to extract these desired variables. The observer designs the implementation aspects, and a comparative study on the extensive experimental results are given.
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