Variable speed induction generator-motor with controllable excit

Electricity: single generator systems – Automatic control of generator or driving means – Speed or frequency of generator

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322 32, 322 20, H02P 900

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active

057291187

ABSTRACT:
A variable velocity apparatus includes a wound-rotor induction machine having a primary winding connected to a power system having a power system frequency, a secondary winding excited by an alternating current (AC), a generator-motor shaft, and a load united with the generator-motor shaft. The apparatus includes a frequency detection element for detecting a change in the power system frequency, and a controller for changing a rotational speed of the induction machine based on the detected change in the power system frequency. The change in the rotational speed is made substantially equivalent to the detected change in the power system frequency, so as to maintain a slip frequency of the induction machine essentially constant when the power system frequency changes.

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Patent Abstracts of Japan, vol. 005, No. 149 (E-075), 19 Sep. 1981 & JP-A-56 081098 (Mitsubishi Electric Corp) 2 Jul. 1981.
Patent Abstracts of Japan, vol. 013, No. 232, (E-765), 29 May 1989 & JP-A-01 039297 (Mitsubishi Electric Corp) 9 Feb. 1989.

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