Speed reducing control system for a polyphase electric motor

Details Speed reducing control system for a polyphase electric motor Speed reducing control system for a polyphase electric motor

1983-10-11

1984-07-24

Rubinson, G. Z.

Electricity: motive power systems

Induction motor systems

318772, H07P 540

Patent

active

044619855

ABSTRACT:
A variable speed 3-phase a-c motor is connected to a 3-phase source of alternating voltage via five controllable bidirectional solid state switches which are so arranged and controlled that motor speed can be reduced by skipping selected cycles of the source voltage. For example, for half speed operation three of the switches are arranged respectively to connect phases A, B and C of the source to phases A, C and B of the motor, and over two consecutive periods of the source voltage three separate, uniformly spaced "firing windows" are selected during which the conducting states of these switches are initiated in a predetermined pattern that results in the phase A-to-phase B source voltage being applied to the motor during the first window, the phase C-to-phase A source voltage being applied during the next window, and the phase B-to-phase C source voltage being applied during the last window.

REFERENCES:
patent: 3307094 (1967-02-01), Ogle
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 (1979-11-01), Asano et al.
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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