Novel sensorless control for pm synchronous motors based on maximum torque control frame

In this paper, a novel position sensorless vector control for IPMSMs is described. First, we define a novel coordinate frame (hereafter called the maximum torque control (MTC) frame), which has one axis aligned with the current vector of the maximum torque-per-ampere (MTPA) control and propose a sensorless control method for directly estimating the MTC frame. Because the parameter Lqmmiddot for estimating the frame is less affected by magnetic saturation than the conventional Lqm, the influence of magnetic saturation on the position estimation can be greatly suppressed. In additional, excellent current vector loci are observed even when Lqmmiddot is approximated by a constant value. This method is robust against changes in inductance caused by magnetic saturation. After defining an extended electromotive force model based on the proposed frame and a parameter Lqmmiddot for an estimation of the frame, we confirm the effectiveness of the proposed method by simulations and experiments.

[1]  M. Sanada,et al.  Sensorless control strategy for salient-pole PMSM based on extended EMF in rotating reference frame , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[2]  Shinji Shinnaka.  New Practical Optimal Current Control Methods for Energy-Efficient Wide-Speed-Range Operation of Salient-Pole Permanent Magnet Synchronous Motor with Core-Losses , 2003 .

[3]  Shinji Doki,et al.  Sensorless control of interior permanent magnet synchronous motor by estimation of an extended electromotive force , 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).

[4]  Shigeo Morimoto,et al.  Wide-speed operation of interior permanent magnet synchronous motors with high-performance current regulator , 1994 .

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

[6]  Yoshio Tomigashi,et al.  Position Sensorless Vector Control for Permanent Magnet Synchronous Motors Based on Maximum Torque Control Frame , 2007 .

[7]  Shinji Doki,et al.  Sensorless Control of Synchronous Reluctance Motors based on an Extended Electromotive Force Model and Inductance Measurement in the Model , 2005 .

[8]  Nian Heng.  Sensorless Control of Interior Permanent Magnet Synchronous Motor by Estimation of an Extended Electromotive Force , 2007 .

[9]  Takaharu Takeshita.  Back EMF Estimation-Based Sensorless Salient-Pole Brushless DC Motor Drives , 1997 .