Method and apparatus for sensorless operation of brushless perma

Details Method and apparatus for sensorless operation of brushless perma Method and apparatus for sensorless operation of brushless perma

1996-12-20

1998-04-14

Masih, Karen

Electricity: motive power systems

Limitation of motor load, current, torque or force

318138, 318254, H01R 3946

Patent

active

057396523

ABSTRACT:
A sensorless method and apparatus for providing commutation timing signals for a brushless permanent magnet motor extracts the third harmonic back-emf of a three-phase stator winding and independently cyclically integrates the positive and negative half-cycles thereof and compares the results to a reference level associated with a desired commutation angle.

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"P.M. Brushless Motor Drives: A Self-Commutating System without Rotor-Position Sensors" P. Ferraris, A. Vagati, F. Villata, Istituto di Macchine Elettriche Politecnico di Torino--Torino, Italia.
"Self-Commutation of Brushless DC Motors Without Encoders", M. Jufer, Laboratoire d' Electromecanique, Ecole Polytechnique Federale de Lausanne. ch. de Bellerive 16, CM-1007 Lausanne, Switzerland.

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