Speed reducing control system with voltage regulation for a poly

Details Speed reducing control system with voltage regulation for a poly Speed reducing control system with voltage regulation for a poly

1983-10-11

1985-06-18

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318727, 318812, H02P 540

Patent

active

045243166

ABSTRACT:
A variable speed 3-phase a-c motor is connected via a plurality of controllable bidirectional switches to a 3-phase source of alternating voltage having a variable fundamental frequency (f) and an rms magnitude (v) that varies with f, and the switches are suitably arranged and controlled so that motor speed can be reduced by skipping selected cycles of the source voltage. When operating at a fraction of full speed, the magnitude-to-frequency ratio of motor voltage is maintained substantially the same as at full speed by varying the "firing angle" at which the switches start conducting current so as to minimize any deviation of the rms magnitude of the motor voltage from the product of v times said fraction.

REFERENCES:
patent: 3307094 (1967-02-01), Ogle
patent: 3665273 (1972-05-01), Enslin
patent: 3826960 (1974-07-01), Broadway et al.
patent: 3908158 (1975-09-01), Studtmann
patent: 4070605 (1978-01-01), Hoeppner
patent: 4078190 (1978-03-01), Nash
patent: 4093898 (1978-06-01), Morters et al.
patent: 4176306 (1979-12-01), Asano et al.
patent: 4233548 (1980-11-01), Kirtley, Jr.
patent: 4461985 (1984-07-01), Stitt
Low-Cost Electronic Speed Controller for Small Induction Motors by W. Matley, K. B. Clarke, and P. Marshall presented at the Second International Conference on Electrical Variable-Speed Drives in London, England on Sep. 25-27, 1979, (IEE Conf. Publ. No. 179, pp. 42-45).

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