Method for controlling the switching-off process (turning-off process, disconnection process) in the strands of a reluctance motor

摘要

In the case of a method for controlling the turning-off process in the strands of a reluctance motor whose stator is provided with windings to which current pulses are fed in an impressed manner, said current pulses being calculated in accordance with a predetermined algorithm, as a function of the angular position and rotation speed of the rotor, the strand through which current is passing is turned off at a turning-off angle (vp) after the reference angle for the zero crossing (v0). In this case, it is necessary to distinguish between two operating regions which are called the "chop" region and block-voltage region. The invention provides that the turning-off angle (vp) is calculated using the same algorithm, and is set by a controller, for both operating ranges of the reluctance motor. In this case, a pulse-width-modulated voltage is applied to the live strand in the low rotation speed range, the "chop" range, and a constant voltage is applied in the upper range, the block-voltage range. The turning-off angle is calculated from the motor parameters and the actual operating variable in both ranges, subject to the condition that the torque yield is maximised and that the turning-off process is produced by the conversion of these variables into a turning-off pulse which turns off the live strand.