AC motor control system
AssigneeHitachi, Ltd.
InventorsTakashi Tsuboi, Tokunosuke Tanamachi
Life of this patent
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Abstract
A control system for an A.C. motor which is connected to the output terminals of a thyristor inverter, a capacitor is connected between the D.C. input terminals of the thyristor inverter, and the respective thyristors constituting the inverter are extinguished by self commutation due to an oscillating current produced by the capacitance of the capacitor and the reactance component of the armature coils of the A.C. motor connected to the A.C. output terminals of the thyristor inverter, and a current in the waveform of pulses produced by electric oscillation is delivered in a predetermined phase sequence to the armature coils of the A.C. motor.
Claims7
An A.C. motor control system comprising:
- a thyristor inverter including a plurality of thyristors adapted to be fed from a D.C. power source to thereby produce A.C. power;
- an A.C. motor connected to the output terminals of said inverter;
- a capacitor connected between the input terminals of said inverter, said capacitor forming an electrical oscillation circuit in combination with the inductance of the armature windings of said A.C. motor to pass a sinusoidal half-wave current through said armature windings when the thyristors of said inverter are triggered;
- and
- gate signal generating means repeatedly supplying the respective electrodes of said plurality of thyristors constituting said inverter with gate signals in predetermined sequence, whereby said motor is supplied with pulse currents.
Dependencies are inferred from the claim text.