| Abstract |
The paper discusses the DSP implmementation of torque and flux pulsation minimization techniques in torque controlled sensorless induction motor and p.m. synchronous motor drives with surface mounted magnets. First, the DSP implementation of sensorless high-performance induction motor drives is discussed which uses torque ripple minimization algorithms. For this purpose, the details of a direct-torque-controlled (DTC) induction motor drive with a simple predictive error compensation technique are discussed. The control scheme also requires estimated flux linkages, which are obtained in two ways: by using a mathematical model (observer) and by using a recursive artificial neural network. It is shown that in contrast to a conventional DTC drive, the torque ripples are reduced and the switching frequency is constant. Experimental results are discussed for a fully digital drive, these prove the effectiveness of the technique. In the second part of the paper, predictive torque and flux ripple minimization techniques are discussed for DTC p.m. synchronous motor drives. It is shown, that the proposed predictive error compensation technique significantly reduces the torque and current ripples. |
