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Torque ripple reduction in three-stage brushless synchronous machines
Pages: 98-103
Year: Issue:  11
Journal: Electric Machines and Control

Keyword:  three-stage synchronous machineaircraft engineexcitation pulsationstart controltorque ripple reduction;
Abstract: Considering the large torque ripple and poor start performance with load which are caused by the excitation current pulsation of the main generator in the electric start process of three-stage brushless synchronous machines, the impact of the excitation current pulsation was analyzed on operating character-istics of the main generator and distribution characteristics of output voltage vector error caused by har-monic currents when vector control strategy was adopted. In order to improve the start performance of the three-stage brushless synchronous machine with load, a start control method was proposed using the polar coordinate to determine the output voltage vector. Compared with the traditional vector control strategy, this method does not produce amplitude error, but only small angle error, of the vector voltage. The ex-perimental results show that, at a speed of 100 r/min, the electric start system adopting the new method can operate steadily with a load of 40 N·m, while for the traditional vector control method, it is only 5 N·m. Therefore, the new method is more suitable for the low speed and heavy load operating condi-tions at the start mode of aircraft engines.
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