Control system of alternating current motors

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

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318809, H02P 736

Patent

active

041588010

ABSTRACT:
In a control system of an alternating current motor energized by a frequency converter including serially connected rectifier and inverter of the type wherein the speed of the motor is controlled by varying the phase of the output current of the inverter by varying the phase of a control signal of the inverter, there are provided a function generator which is supplied with a signal related to the motor torque for generating an analog phase angle signal related to the current phase angle, and a phase shifter responsive to the analog phase angle signal for shifting the phase of the control signal for the inverter.

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patent: 3700986 (1972-10-01), Cushman et al.
patent: 3851234 (1974-11-01), Hoffman et al.
patent: 3896356 (1975-07-01), Hoffman et al.
patent: 3919609 (1975-11-01), Klautschek et al.
patent: 4041361 (1977-08-01), Cornell
patent: 4088934 (1978-05-01), D'Atre et al.
patent: 4088935 (1978-05-01), D'Atre et al.

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