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A new method to reduce the torque ripple and current harmonics is presented in this paper. A conventional 2 level inverter is fed with two inductor boost converter to drive the induction motor. A Hybrid Pulse Width Modulation (HPWM) algorithm is being used to generate the pulses for the 2 level inverter. In proposed hybrid PWM both continuous PWM and discontinuous PWM techniques are employed. This...
Contemporary field oriented controlled induction machine drives constitute a good compromise between high power density and economical employment of exhaustible raw materials. Since for such drives the excitation is created by the magnetizing current which is part of the stator current along with the torque generating fraction, there are two degrees of freedom in the stator current generation to achieve...
The output voltage of an inverter is often assumed proportional to the drive modulation signal. However, in practice the inverter presents nonlinear characteristics that may significantly affect the output voltage, and this may be critical in the context of sensorless drives and parameter identification. Nowadays, several solutions exist to compensate for the nonlinear behaviour of the inverter. Nevertheless,...
This paper proposes the position sensorless drive system for PMSM, in which the inverter is controlled by a six- step square-wave operation at high speed in order to increase the torque and power at high speed region and expand the operating range. The speed and position are estimated based on the estimation of an extended electromotive force, and the sensorless control is achieved not only in the...
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