Importance

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Abstract

In a stepping motor (M), the windings (L1 to L4) can be switched with the aid of switches (111 to 114). Two windings of each pair (e.g. L1 and L2) cannot be brought into the circuit simultaneously and are together arranged in series with a resistor (146) and a transistor circuit (150) adapted to cut off the supply voltage of 25 volts. A comparison and control circuit (130) compares the winding current from the resistor (146) with a reference value which is determined by a digital balancing resistor network (120) controlled by a permanent memory (102) and consequently acts on the form factor of the interruptions of the 25 volt supply current by the transistor circuit (150). The invention enables the multiplication of the number of steps per revolution which can be carried out by a stepping motor.

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First Claim