Four-quadrant brushless reluctance motor drive
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abstract
The switched reluctance motor drive has often been identified as a high-efficiency integral-horsepower drive, and less attention has been focussed on smaller sizes where servo-quality or near-servo-quality drives are in demand. The brushless PM motor is advancing in this area, but the advantages of the SR motor are considerable. Commutation of the Sr motor is as simple as that of the brushless PM motor, using a similar shaft position sensor and gating logic. Speed and torque can be modulated by commutation angle control over a wide range. Combined with voltage p.w.m., sufficient flexibility is obtained by switching between a small number of modes or commutation angle combinations to at least double the speed and torque control ranges compared to those possible with fixed angles. Four-quadrant symmetrical operation is achieved, with rapid reversing. The entire control is readily implemented using any of the normal methods.
