A mechanical sensorless control system for salient-pole brushless DC motor with autocalibration of estimated position angles

In this paper, a mechanical sensorless control system is reported for salient-pole brushless DC motor drives. Here, two new methods are proposed for obtaining the position angle, the accuracy of which affects the operation of the switching devices of the inverter that drives the motor. First, the method for estimating the position angle is proposed. Secondly, the correcting method for reducing the errors involved in the estimation of position angle is given. The experimental results show that the estimated position angles are calibrated automatically, and then the proposed sensorless control system can control the speed and the position angles of the motor precisely.

[1]  Satoshi Miyazaki,et al.  A sensorless detecting strategy of rotor position and speed on permanent magnet synchronous motor , 1990 .

[2]  Michio Nakano,et al.  A New Approach to Reject Angle Dependent Disturbances in Constant Speed Rotation Control Systems , 1992 .

[3]  N. Kasa,et al.  A sensorless position control system by salient-pole brushless DC motor , 1997, Proceedings of the IECON'97 23rd International Conference on Industrial Electronics, Control, and Instrumentation (Cat. No.97CH36066).

[4]  A. Toba,et al.  Sensor-less torque control of salient-pole synchronous motor at zero speed operation , 1997, Proceedings of APEC 97 - Applied Power Electronics Conference.

[5]  H. Watanabe,et al.  Fuzzy inference correction of calculated position angles of the sensorless direct drive servomotor , 1992, Proceedings of the 1992 International Conference on Industrial Electronics, Control, Instrumentation, and Automation.

[6]  Nobuyuki Matsui,et al.  Sensorless PM brushless DC motor drives , 1996, IEEE Trans. Ind. Electron..

[7]  N. Kasa,et al.  A detecting method of position angle at standstill and lower speed region for salient-pole brushless DC motors , 1996, Proceedings of the IEEE International Conference on Industrial Technology (ICIT'96).

[8]  S. Ostlund,et al.  Sensorless rotor-position detection from zero to rated speed for an integrated PM synchronous motor drive , 1996 .

[9]  Nobuyuki Kasa,et al.  A Detecting Method of Starting Position Angle for Salient-pole Brush-less DC Motors , 1996 .