Reversible variable frequency oscillator for smooth reversing of

Details Reversible variable frequency oscillator for smooth reversing of Reversible variable frequency oscillator for smooth reversing of

1978-04-10

1980-10-07

Truhe, J. V.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318801, 318807, 318808, 318810, 318811, H02P 742

Patent

active

042271380

ABSTRACT:
A variable speed ac motor drive such as a controlled current inverter drive with load angle control generates an inverter frequency command signal which at low speed has a large ripple component and a small dc component representing the desired frequency. A variable frequency oscillator is responsive only to the dc component and supplies timing pulses to a ring counter which generates thyristor gating signals in the forward and reverse phase sequence. Smooth reversing over a wide range of torque is realized, and multipulse operation is inherent at low speeds to modulate the inverter output and minimize cogging torque.

REFERENCES:
patent: 3748556 (1973-07-01), Gillett
patent: 3829754 (1974-08-01), Rettig
patent: 3919609 (1975-11-01), Klautschek et al.
patent: 3962614 (1976-06-01), Rettig
patent: 4088934 (1978-05-01), D'Atre et al.
patent: 4134055 (1979-01-01), Akamatsu
patent: 4137489 (1979-01-01), Lipo
Plunkett et al., "Synchronous Control of a Static AC Induction Motor Drive," Conference Record of IEEE, 10/77, pp. 609-615.
Lienau et al., "Power Converters for Feeding a Synchronous Traction Motors of Single Phase AC Vehicles," Conference Record of IEEE, 1977, pp. 295-304.

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