Sensorless brushless DC control using a current waveform anomaly
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abstract
This paper develops a new method of sensorless control for brushless d.c. (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 non-salient, trapezoidal back-emf (bemf), surface-mounted permanent-magnet BLDC. Details of the new method of sensorless brushless d.c. control are revealed. 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.
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Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370)
Conference Record of the 2000 IEEE Industry Applications Conference Thirty-Fifth IAS Annual Meeting and World Conference on Industrial Applications of Electrical Energy (Cat No00CH37129)