System for controlling alternating current motors

Details System for controlling alternating current motors System for controlling alternating current motors

1979-02-22

1981-01-20

Truhe, J. V.

Electricity: motive power systems

Synchronous motor systems

Armature winding circuits

318722, 318723, H02P 528

Patent

active

042465281

ABSTRACT:
In a control system of an AC motor fed from a frequency converter including a thyristor rectifier and a thyristor inverter, the speed of the motor is controlled by a current control system comprising a speed control circuit responsive to a reference speed signal and an actual speed signal, and a current control circuit which produces a pulse signal supplied to the rectifier. The inverter is controlled by another pulse signal corresponding to the angular position of the rotor of the motor. An additional current instruction circuit is provided which in response to the two pulse signals described above controls the current control circuit.

REFERENCES:
patent: 3780361 (1973-12-01), Poppinger et al.
patent: 4112339 (1978-09-01), Lipo
patent: 4137489 (1979-01-01), Lipo

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