New Simple Torque-Sensorless Torque Control for Quasi-perfect Compensation of Sixth-Harmonic Torque Ripple Due to Nonsinusoidal Distribution of Back EMF of PMSM

作者：Shinnaka Shinji^*; Kishida Hideo

来源：Electrical Engineering in Japan, 2013, 185(2): 51-63.

DOI：10.1002/eej.22295

• permanent magnet synchronous motor
• torque ripple
• sensorless
• torque control
• compensation

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

• 出版日期2013-11