Fig. 1. Space vector diagram of PMSM.
Fig. 2. Block diagram of the least order observer for estimating eγest.
Fig. 3. Block diagram of estimating rotor speed and angle.
Fig. 4. Control block diagram of sensorless PMSM drive system.
Fig. 5. Short-circuit current vectors generated by (a) first and (b) second zero vector.
Fig. 6. Simulation results of EEMF based sensorless PMSM drive system.
Fig. 7. Simulation results of proposed restarting method for EEMF based sensorless PMSM drive system.
Fig. 8. Experimental set.
Fig. 9. Experimental results of EEMF based sensorless PMSM drive system.
Fig. 10. Experimental results of proposed restarting method for EEMF based sensorless PMSM drive system.
Fig. 11. Experimental results of initial rotor speed and angle estimated by using the proposed restarting method.
TABLE I PMSM PARAMETERS
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