Sensorless speed control of permanent-magnet motors with nonsinusoidal EMF waveform

A novel sensorless speed-control strategy for permanent-magnet AC motors (PMACMs) is presented. A nonlinear reduced-order observer and a high-gain observer are designed to estimate the induced EMF, without mechanical position or speed sensors. In contrast with previous proposals, the EMF estimation is performed without previous knowledge of its waveform. From the estimated EMF, the rotor speed and the position derivatives of flux are calculated and used for the implementation of a PMACM speed control without mechanical position sensor. The proposed strategy is not limited to PMACM with sinusoidal or trapezoidal EMF waveform. Moreover, it allows the PMACM ripple torque and copper losses to be minimised. The performance of the proposal is validated through simulation and experimental results.

[1]  Ralph Kennel,et al.  Sensorless speed and position control of synchronous machines using alternating carrier injection , 2003, IEEE International Electric Machines and Drives Conference, 2003. IEMDC'03..

[2]  Thomas M. Jahns,et al.  Pulsating torque minimization techniques for permanent magnet AC motor drives-a review , 1996, IEEE Trans. Ind. Electron..

[3]  H. K. Khalil,et al.  Numerical differentiation using high-gain observers , 1997, Proceedings of the 36th IEEE Conference on Decision and Control.

[4]  R. Leidhold,et al.  PMAC motor control strategy, based on the instantaneous active and reactive power, for ripple-torque and copper-losses minimization , 2000, 2000 26th Annual Conference of the IEEE Industrial Electronics Society. IECON 2000. 2000 IEEE International Conference on Industrial Electronics, Control and Instrumentation. 21st Century Technologies.

[5]  C. De Angelo,et al.  Sensorless speed control of permanent magnet motors with torque ripple minimization , 2002, IEEE 2002 28th Annual Conference of the Industrial Electronics Society. IECON 02.

[6]  Jorge A. Solsona,et al.  Disturbance and nonlinear Luenberger observers for estimating mechanical variables in permanent magnet synchronous motors under mechanical parameters uncertainties , 2003, IEEE Trans. Ind. Electron..

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

[8]  Myung Joong Youn,et al.  Torque harmonics minimisation in permanent magnet synchronous motor with back EMF estimation , 1994 .

[9]  Ouassima Akhrif,et al.  A nonlinear state observer for the sensorless control of a permanent-magnet AC machine , 2001, IEEE Trans. Ind. Electron..

[10]  Jorge A. Solsona,et al.  Nonlinear control of a permanent magnet synchronous motor with disturbance torque estimation , 2000 .

[11]  D. C. Hanselman,et al.  Effect of skew, pole count and slot count on brushless motor radial force, cogging torque and back EMF , 1997 .

[12]  Hyun-Soo Kim,et al.  A new instantaneous torque control of PM synchronous motor for high performance direct drive applications , 1997 .

[13]  Carlos H. Muravchik,et al.  On speed and rotor position estimation in permanent-magnet AC drives , 2000, IEEE Trans. Ind. Electron..