中文摘要：

多电飞机、全电飞机的快速发展以及机载用电设备的不断增加，对电源系统提出了更高的要求。在传统的三级式同步电机的基础上提出的两级式混合励磁同步电机，在实现无刷化励磁的同时，兼顾了永磁电机的高功率密度和电励磁电机磁场可调的优点，在机载电源系统中应用前景广阔。基于一台用于两级式起动／发电电源系统的切向／径向磁路并联结构混合励磁同步电机，针对在转子静止时采用直流励磁方式主发电机无法获得励磁电流的问题，经过理论推导和实际测试总结出一种起动励磁控制策略，结合空间矢量算法，有效提高了起动过程的响应速度和带载能力，分别通过仿真和实验证明l『该方案的正确性和可行性。

英文摘要：

The fast development of more electric aircrafts （MEA） and all electric aircrafts （AEA） and the rapid increase of airbome electrical equipments both demand a high- performance aircraft power system. Based on the traditional three stage starter-generator system, a type of two stage starter-generator is proposed, which adopts the brushless structure and combines the metrics of high power density and adjustable magnetic fields at the same time. So, it can be used in independent power supply system extensively. In this paper, a tangential/radial hybrid excitation synchronous machine （T/R- HESM） is used in the two stage starter.generator system. Through theoretical deduction and practical tests, a new start excitation strategy is put forward to solve the problem that the main generator cannot get the dc exciting current when rotor is static. Combining with space vector pulse width modulation （SVPWM） algorithm, the start process response speed and loading capacity are increased respectively. Both simulation and experiment results prove the validity and feasibility of the strategy.