Interaction between the current controller and the injection of alternating carriers in sensorless drives

The injection of an alternating voltage carrier, which is generated by the inverter, allows to detect the rotor position in PM synchronous motors by evaluation of the anisotropies. There are however some limitations on the carrier frequency. On one hand, it must be much lower than the inverterpsilas switching frequency. On the other hand it must be high enough in order to avoid being attenuated by the current controller. As the current controllers are usually designed to reach the highest possible bandwidth, in the proposals for carrier-based position detection methods their bandwidth are limited. In this paper, the interaction between the current controller and the injected carrier is studied. A method to keep the highest bandwidth for the current controller while maximizing the carrier path gain is proposed in order to optimize the position detection.

[1]  Robert D. Lorenz,et al.  Transducerless position and velocity estimation in induction and salient AC machines , 1994, Proceedings of 1994 IEEE Industry Applications Society Annual Meeting.

[2]  Alfio Consoli,et al.  Industry application of zero-speed sensorless control techniques for PM synchronous motors , 2001 .

[3]  R. Leidhold,et al.  Sensorless position-control method based on magnetic saliencies for a Long-Stator Linear Synchronous-Motor , 2006, IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics.

[4]  E. Robeischl,et al.  Optimized INFORM measurement sequence for sensorless PM synchronous motor drives with respect to minimum current distortion , 2002, IEEE Transactions on Industry Applications.

[5]  Paul P. Acarnley,et al.  Review of position-sensorless operation of brushless permanent-magnet machines , 2006, IEEE Transactions on Industrial Electronics.

[6]  Joachim Holtz,et al.  Elimination of saturation effects in sensorless position controlled induction motors , 2002 .

[7]  Ralph Kennel,et al.  Encoderless Control of Industrial Servo Drives , 2006, 2006 12th International Power Electronics and Motion Control Conference.

[8]  Guillermo R. Bossio,et al.  A rotor position and speed observer for permanent-magnet motors with nonsinusoidal EMF waveform , 2005, IEEE Transactions on Industrial Electronics.

[9]  S. Sul,et al.  Sensorless drive of surface-mounted permanent-magnet motor by high-frequency signal injection based on magnetic saliency , 2003 .

[10]  Dong-Choon Lee,et al.  Sensorless speed control of nonsalient permanent magnet synchronous motor using rotor position tracking PI controller , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).