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This paper presents a dynamic hysteresis toque band strategy for improving flux regulation at low and zero speeds in a direct torque control (DTC)-look-up-table-based induction machine. The hysteresis torque band is controlled based on speed variation to solve the stator flux magnitude droops which normally occur at low frequency. The main benefit of the proposed approach is its simplicity, since...
Effects of zero voltage vectors on the amplitude of stator flux, torque angle and torque of permanent magnet synchronous motor (PMSM) direct torque control (DTC) system are studied. Due to voltage drop on stator resistance, the application of zero voltage vectors decreases the amplitude of stator flux. Due to the move of rotor flux, it decreases torque angle, furthermore, decreases torque. Thus it...
In this paper the theory of direct torque control (DTC) in permanent magnet synchronous motor (PMSM) is investigated. The effect of zero voltage vectors on the performances of the PMSM DTC drives is analyzed. Different from the conventional switching table eliminating zero voltage vectors, a novel switching table using zero voltage vectors is proposed. Simulation results show that the PMSM DTC drives...
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