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In this paper, direct torque control (DTC) of a three-phase permanent magnet (PM) brushless AC (BLAC) motor having one phase open-circuit fault is described. An extra inverter leg is employed to provide the current path during the fault operation. The new flux estimation algorithm for the faulty motor is presented. The simulation results show that the proposed DTC yields satisfactory torque and flux...
The torque-speed characteristics of a 3-phase permanent magnet brushless machine, having an interior permanent magnet rotor and an essentially sinusoidal back-emf waveform, are determined experimentally when the motor is operated in brushless AC (BLAC) mode, with 3-phase, sinusoidal current waveforms, and in brushless DC (BLDC) mode with both 2-phase, 120deg conduction and 3-phase, 180deg conduction...
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