Abstract：The special problem of speed sensorless control applied in traction motor is to restart the motor after coasting process when rotor position and speed is not known. The short current vector method is adopted in this paper during coasting, while the modified stator flux method is used after PMSM restarting. During coasting, the short-circuit current is produced by back-EMF when zero voltage vector is used by inverter. The rotor position and speed could be estimated by two times short-circuit current vector. Both the simulation and experimental results show that the method has high estimation accuracy and can restart PMSM stably.
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2013, Vol. 28 
