Electricity: motive power systems – Induction motor systems – Power-factor control
Patent
1989-07-21
1990-06-19
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Power-factor control
318798, 318811, H02P 540
Patent
active
049356844
ABSTRACT:
This invention relates to a control system for an induction motor which has power factor control means for altering the power factor of the input current of a converter composed of self-arc extinguishing elements, such as transistors, to vary the d.c. output voltage of the converter to perform a pulse-amplitude modulation control in a variable voltage, variable frequency controller for controlling the rotating speed of the induction motor by the converter of a sinusoidal wave input to reduce noise generated by the operation of the motor.
REFERENCES:
patent: 3748556 (1973-07-01), Gillett
patent: 4328454 (1982-05-01), Okuyama et al.
patent: 4420719 (1983-12-01), D'Atre et al.
patent: 4602199 (1986-07-01), Walker
patent: 4652989 (1987-03-01), Kurosawa
International Power Electronics Conference, Conference Record, Mar. 27-31, 1983, pp. 720-731; "High Performance AC Motor Speed Control System Using GTO Converters", Toshiaki Okuyama et al.
Mitsubishi Denki & Kabushiki Kaisha
Smith Jr. David
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