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In conventional direct torque control (DTC) strategy, the inverter switching frequency is not fixed, torque ripple and total current harmonic distortion is high. In order to overcome these problems, improved DTC using space vector pulse width modulation strategy (SVPWM-DTC) is proposed in this paper. Switching table is replaced by SVPWM module to enable the fixed switching frequency. On the other...
A direct torque control strategy for dual three-phase permanent magnet synchronous motors is presented in this paper. The motor has two sets of three-phase stator windings spatially phase shifted by 30 electrical degrees. In order to reduce the harmonic current in stator windings which has no contribution to torque production, torque and flux are controlled based on regulators and three-phase decomposition...
The continuous improvement of social practical production demands modern motor controlling technology. PMSM has been widely applied to those occasions of high performance because of its excellent performance. However, there are large flux linkage and torque ripples and inconstant switching frequency in the conventional DTC. To solve these problems, PMSM DTC using SVPWM based on the subdivision of...
Present work shows the merits of space vector modulation direct torque control (SVPWM DTC) over the conventional direct torque control (conventional DTC). SVPWM DTC technique is helpful in solving the basic issues of torque ripple and variable switching frequency present in the conventional DTC. Three PI controllers one each for speed, torque and flux feedback loops is used in SVPWM DTC based IM drive...
This paper presents the work in continuation with part-I. Present work deals with the basic issues associated with the direct torque control (DTC) of induction motor drive. The work is focused to reduce the electromagnetic torque ripple using the concept of multirate sampling. DTC based induction motor drive is simulated using space vector modulation incorporating the multirate sampling. It is also...
Direct torque control (DTC) can produce quick and robust response, but it has the problems of large torque ripples and inconstant inverter switching frequency. This paper introduces a modified direct torque control based on the space vector pulse width modulation (SVPWM) for interior permanent magnet synchronous motor (IPMSM) drive without a speed sensor. Two PI controllers regulate the flux and torque...
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