CAJ | 학술논문

针对三级式同步电机在电动起动过程中，主发电机的转子励磁脉动导致输出转矩脉动较大、带载起动性能较低的问题，分析了转子励磁脉动对主发电机运行特性的影响，以及在采用矢量控制策略时，由于受到谐波电流的影响而输出的误差电压矢量的分布特点。为了提高主发电机的带载起动性能，本文提出了一种采用极坐标确定控制器调制电压矢量的起动控制方法，与传统的矢量控制策略相比，该方法在一个调节周期内不会产生电压幅值调节误差，仅会产生较小的矢量角调节误差。实验结果表明，在100 r/min转速时，传统矢量控制方法仅能拖动5 N·m的负载，新方法则能够稳定拖动40 N·m负载，说明新方法更适合电机在拖动航空发动机起动过程中低转速、大负载的运行工况。
침대삼급식동보전궤재전동기동과정중，주발전궤적전자려자맥동도치수출전구맥동교대、대재기동성능교저적문제，분석료전자려자맥동대주발전궤운행특성적영향，이급재채용시량공제책략시，유우수도해파전류적영향이수출적오차전압시량적분포특점。위료제고주발전궤적대재기동성능，본문제출료일충채용겁좌표학정공제기조제전압시량적기동공제방법，여전통적시량공제책략상비，해방법재일개조절주기내불회산생전압폭치조절오차，부회산생교소적시량각조절오차。실험결과표명，재100 r/min전속시，전통시량공제방법부능타동5 N·m적부재，신방법칙능구은정타동40 N·m부재，설명신방법경괄합전궤재타동항공발동궤기동과정중저전속、대부재적운행공황。
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.