Control circuit for reducing field voltage in D.C. motors
AssigneeBBC Brown, Boveri & Company, Limited
InventorsFranz Galliker, Peter Knapp
Life of this patent
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Abstract
A circuit arrangement is disclosed for reducing field voltage peaks in direct current motors which are energized by way of an electronic D.C. regulator, and which have an exciter winding connected with the armature and commutating pole windings by means of diodes. The circuit arrangement includes a choke coil connected in series with the exciter winding. In addition, a resistor is connected in parallel with the exciter winding. This arrangement prevents a rapid rise in the field current or the magnetic field flux of the motor.
Claims6
In a direct current motor circuit provided with automatic field suppression and including an armature winding, a commutating pole winding connected to the armature winding, an exciter winding connected to the armature winding and the commutating pole winding by a pair of diodes, and an electronic direct current regulator, means for decreasing the field voltage peaks in the motor, comprising:
- a choke coil connected in series with the exciter winding, and
- a resistor connected in parallel with the exciter winding and operative to conduct current of either polarity during operation of the direct current regulator.
Dependencies are inferred from the claim text.