Importance

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Abstract

A reversible switched reluctance motor and methods therefor. The motor includes a current sensor for sensing the current supplied by a DC link and for producing a current signal having a parameter representative of the current. A controller provides a control signal having a parameter representative of the desired speed and direction of rotation of a rotatable assembly of the motor. A dwell generator provides firing pulses to a converter for driving the motor and varies the duration of each of the firing pulses as a function of the speed and direction parameter and the current parameter. Further, a timing generator, responsive to the speed and direction parameter, generates a timing signal defining a rate dependent on the parameter. The dwell generator varies the pulse rate of the firing pulses as a function of the defined rate of the timing signal and the converter commutates each of the windings for a period of time and at a rate dependent on the duration and pulse rate of the firing pulses. The controller controls the speed and direction of rotation of the rotatable assembly by delaying commutation so that the motor operates as a generator for braking the rotatable assembly and by suitably varying the speed and direction parameter of the control signal.

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First Claim