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In this paper, a modified direct torque control (DTC) for permanent-magnet synchronous machines, which enables important torque- and flux-ripple reduction by using voltage vectors with variable amplitude and angle, is proposed. In the proposed DTC, the amplitudes of torque and flux errors are differentiated and employed to regulate the amplitude and angle of the output voltage vectors online, which...
A novel model based predictive torque control (MPTC) method is proposed in this paper for permanent magnet synchronous motor (PMSM) drives. By choosing the voltage vector best satisfying the demands of torque and flux, important reduction in torque and flux ripples can be observed compared to conventional DTC. Furthermore, the losses of system can be reduced effectively by incorporating the switching...
One-step delay in digital implementation of direct torque controlled (DTC) AC motor drives leads to large torque ripple and low switching frequency. Two remedies are proposed in this paper to eliminate the one-step delay. One is based on model-based prediction, which is complex and relies much on the model; the other is based on the multiple sampling of stator current. Different from the model-based...
Three-level neutral-point-clamped (NPC) inverters are very appropriate for high-power adjustable-speed drive applications. Direct torque control is characterized by the merits of fast response, simple structure and strong robustness to motor parameters variations. This paper presents a 3-level inverter-fed direct torque controlled (DTC) induction motor (IM) drive based on optimized switching table...
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