PWM-based instantaneous current profile tracknig control for torque ripple suppression in switched reluctance servomotors

This paper proposes instantaneous current profile tracking control for minimizing torque ripple of switched reluctance motors. Because of its unique principle of torque generation different from conventional AC motors, instantaneous current profiling control is essential to regulate the torque with ripple minimized. In addition, since its conventional motor model in order to determine an adequate applied voltage reference is established not yet, a hysteresis current regulator is generally employed, in which it is rather difficult to design switching frequency of converter. In the proposed scheme, the controller can calculate the adequate applied voltage reference which can determined based on the voltage equation derived from non-linear magnetizing curve model. The applied voltage reference is realized under conventional subharmonic PWM with a carrier frequency of 12 KHz and fixed DC-voltage of 283V. The experimental results using 400W test motor with 8/6 poles configuration verify that the measured instantaneous current profiles well follow the reference profiles.

[1]  Iqbal Husain,et al.  Torque ripple minimization in switched reluctance motor drives by PWM current control , 1994, Proceedings of 1994 IEEE Applied Power Electronics Conference and Exposition - ASPEC'94.

[2]  N. Matsui,et al.  Development of high torque density and efficiency vswitched reluctance motor with 0.1mm short airgap , 2007, 2007 European Conference on Power Electronics and Applications.

[3]  B.W. Williams,et al.  Torque ripple reduction in switched reluctance motor drives using B-spline neural networks , 2005, Fourtieth IAS Annual Meeting. Conference Record of the 2005 Industry Applications Conference, 2005..

[4]  M. Ehsani,et al.  Optimized torque control of switched reluctance motor at all operational regimes using neural network , 1998, Conference Record of 1998 IEEE Industry Applications Conference. Thirty-Third IAS Annual Meeting (Cat. No.98CH36242).

[5]  Robert D. Lorenz,et al.  Rotating vector methods for smooth torque control of a switched reluctance motor drive , 2000 .

[6]  Iqbal Husain,et al.  Torque ripple minimization in switched reluctance motors using adaptive fuzzy control , 1997, IAS '97. Conference Record of the 1997 IEEE Industry Applications Conference Thirty-Second IAS Annual Meeting.