Abstract:

The digital voltage regulators have great advantages over the transistor voltage regulators, which are adopted by the generators in most aircraft. As in the transistor voltage regulators, the highest field limitation current in the digital voltage regulators can protect the power devices in the field loops from the generators ' faults. Furthermore, the highest field current limitation can improve the loading transient response of brushless AC generators(BLACG) with suitable limitation values. The paper analyzes the influence of the highest field current limitation on the loading transient process of the BLACG. A method of setting the field current limitation values has been induced. The paper presents the curve imitation method to setting the field current limitation value in a varied speed BLACG. The imitation curve is accordant to the curve drawn by the theoretic equation. With the method of setting the field current limitation values presented in the paper, the good loading transient performance of the BLACG can be assured in its rotation speed range.

Key words: brush less AC generato r, loading t ransient p rocess, field current, overshoo t ing, curve im itat ionmethod