Control systems of alternating current motors

Electricity: motive power systems – Induction motor systems – Primary circuit control

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318810, 318811, H02P 736

Patent

active

041863348

ABSTRACT:
In a control system of an alternating current motor energized by serially connected rectifier and inverter wherein the output DC voltage of the rectifier is controlled by a phase controller which is controlled by a phase control signal and the output frequency of the inverter is controlled by a speed reference signal there is provided a power factor detector which differentiates the phase control signal or the DC voltage and the output of the phase detector is added to the speed reference signal so as to suppress low frequency oscillations of the torque of the motor.

REFERENCES:
patent: 3619749 (1971-11-01), Schieman
patent: 3619750 (1971-11-01), Mokrytzki et al.
patent: 3919609 (1975-11-01), Klavtschek et al.
patent: 4001660 (1977-01-01), Lipo
patent: 4019105 (1977-04-01), Cornell et al.
patent: 4041361 (1977-08-01), Cornell
Kume et al., "Speed Transient of Induction Motor Driven by Current Source Type Inverter", IEEE Conf. Rec. Ann. Meeting Ind. -- Appl. Soc., 1973, 8th, pp. 865-874.

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