New Simple Torque-Sensorless Torque Control for Quasi-Perfect Compensation of 6th Harmonic Torque Ripple Due to Nonsinusoidal Distribution of Back EMF of PMSM

This paper proposes a new torque-sensorless torque control method for permanent-magnet synchronous motors (PMSMs). The proposed method can almost perfectly compensate the 6th harmonic torque ripple that is caused by the nonsinusoidal distributions of the back EMF and rotor magnetic flux of PMSMs. The torque control system is, in principle, constructed on the basis of the vector control, but has two new dedicated speed-varying devices—a harmonic torque observer and current controller. The speed-varying harmonic torque observer can estimate the harmonic component over a wide speed range, even in the case where the produced torque is constant, and generate a suitable compensating signal. The speed-varying current controller shows stable control performance over a wide speed range, it can fully track the compensated current command containing the dc and 6th harmonic components. The effectiveness of the proposed method is examined and verified through extensive numerical experiments.

[1]  Yi Ruan,et al.  Torque Ripple Minimization in Interior PM Machines using FEM and Multiple Reference Frames , 2006, 2006 1ST IEEE Conference on Industrial Electronics and Applications.

[2]  Muneaki Ishida,et al.  Periodic learning suppression control of torque ripple utilizing system identification for permanent magnet synchronous motors , 2010, The 2010 International Power Electronics Conference - ECCE ASIA -.

[3]  S.K. Panda,et al.  Torque ripple minimization in PM synchronous motors using iterative learning control , 2004, IEEE Transactions on Power Electronics.

[4]  S. Arimoto,et al.  Robustness of P-type learning control with a forgetting factor for robotic motions , 1990, 29th IEEE Conference on Decision and Control.

[5]  Hiroshi Fujimoto,et al.  Torque ripple suppression control for PM motor with high bandwidth torque meter , 2009, 2009 IEEE Energy Conversion Congress and Exposition.

[6]  N. Matsui,et al.  High precision torque control of reluctance motors , 1989, Conference Record of the IEEE Industry Applications Society Annual Meeting,.

[7]  Muneaki Ishida,et al.  Suppression control method for torque vibration of AC motor utilizing repetitive controller with Fourier transformer , 2000, Conference Record of the 2000 IEEE Industry Applications Conference. Thirty-Fifth IAS Annual Meeting and World Conference on Industrial Applications of Electrical Energy (Cat. No.00CH37129).

[8]  Joachim Holtz,et al.  Identification and compensation of torque ripple in high-precision permanent magnet motor drives , 1996, IEEE Trans. Ind. Electron..

[9]  Iqbal Husain,et al.  Torque ripple minimization in switched reluctance motor drives by PWM current control , 1996 .

[10]  K. Akatsu,et al.  A New Control Method for Torque Ripple Compensation of Permanent Magnet Motors , 2010, The 2010 International Power Electronics Conference - ECCE ASIA -.

[11]  Hiroshi Fujimoto,et al.  Torque ripple suppression control for PM motor with current control based on PTC , 2010, The 2010 International Power Electronics Conference - ECCE ASIA -.