Sensorless brushless DC control using a current waveform anomaly

This paper develops a new method of sensorless control for brushless DC (BLDC) machines. The new sensorless control method utilizes relative rotor position feedback information which is extracted from the hysteresis chopping of the sensed phase current waveforms in a nonsalient, trapezoidal back-EMF, surface-mounted permanent-magnet BLDC. Details of the new method of sensorless brushless DC control are revealed. The existence and uniqueness of the hysteresis waveform feedback information is shown. A simulation of two modes of the new sensorless control and experimental validation are performed.

[1]  K. Uezato,et al.  Adjustable speed control of brushless DC motors without position and speed sensors , 1995, Proceedings IEEE Conference on Industrial Automation and Control Emerging Technology Applications.

[2]  Mehrdad Ehsani,et al.  Permanent-Magnet Synchronous , 1992 .

[3]  Joachim Holtz.  Speed estimation and sensorless control of AC drives , 1993, Proceedings of IECON '93 - 19th Annual Conference of IEEE Industrial Electronics.

[4]  Frede Blaabjerg,et al.  Comparison of two, energy optimizing techniques for PM-machines , 1994, Proceedings of IECON'94 - 20th Annual Conference of IEEE Industrial Electronics.

[5]  J. Holtz.  State of the art of controlled AC drives without speed sensor , 1995, Proceedings of 1995 International Conference on Power Electronics and Drive Systems. PEDS 95.

[6]  C. Pollock,et al.  Sensorless commutation techniques for brushless permanent-magnet and reluctance motor drives , 1992 .

[7]  Kouhei Ohnishi,et al.  Estimation, identification, and sensorless control in motion control system , 1994 .