一种新型的双凸极起动/发电机的研究及实践

介绍一种可以适应于航空低压直流、变速恒频、高压直流电气系统的新型双凸极起动 /发电机系统 ,并对其电动及发电机理进行了理论研究 ,给出起动 /发电机的相应控制策略 ,在此基础上研制了 18k W样机并进行了原理试验研究 ,试验结果表明 :双凸极电机起动 /发电系统的方案具有结构简单、可靠及控制方便等优点 ,适合作航空用起动 /发电机     

航空发动机起动性能改善措施试验研究

为优化某型涡扇发动机起动特性,解决发动机起动过程中存在的问题,提高起动成功率,在不改变发动机主体结构条件下,对采用大功率起动机与提高起动机脱开转速和压气机放气3项措施进行了分析、设计及试验验证,最终确定采用大功率起动机结合提高脱开转速的措施,在进气温度为-25~50℃范围内,使发动机起动时间缩短0.19~0.51,起动排气温度降低0.04~0.10。     

燃气涡轮起动机高空台高空起动试验研究

介绍了某型燃气涡轮起动机在高空台进行高空起动试验的安装方式、试验条件和试验方法,并对高空起动试验结果进行了详细分析。研究表明,通过增加起动加速供油量与起动电机功率,可有效扩展燃气涡轮起动机的高空起动包线,且起动机的冷机时间对其起动特性有着显著影响。同时,在此类起动机高空台试验中,应对滑油管道提供相应的保温措施,以保证起动机在低温环境下的冷机过程中,滑油温度不至于过低而影响起动。     

RESEARCH OF THE SWITCHED RELUCTANCE STARTER/GENERATOR SYSTEMS

This paper focuses on the simulation and test of the switched reluctance starter/generator systems. Through the emulational analysis of the initial starting torque, the optimal turn-on section of the power switches is discovered. The fundamental theory of the generating operation is analyzed with the linearity model, and a new method is presented based on voltage pulse width modulation for the generating mode control. Through the steady-state and optimized emulation of the output power and system efficiency, the optimizational control approach for the generating mode over a wide speed range is introduced. At last, the test of the 3KW prototype system shows that the dynamic and static performance of this system is fine.     

航空无刷同步电机起动发电系统电动运行励磁特性

对航空无刷同步电机起动发电系统电动运行的励磁特性进行了理论分析,提出了交直流混合励磁方案,建立了系统的MATLAB/SIMULINK仿真模型。仿真结果表明,主发电机励磁电流平均值随励磁机励磁频率的升高而减小,且主发电机励磁电流脉动率随转速升高有唯一极小值点,该点可作为交直流励磁的切换点。     

Design and analysis of a novel hybrid cooling method of high-speed high-power permanent magnet assisted synchronous reluctance starter/generator in aviation applications

To improve the heat dissipation performance, this paper proposes a novel hybrid cooling method for high-speed high-power Permanent Magnet assisted Synchronous Reluctance Starter/Generator (PMaSynR S/G) in aerospace applications. The hybrid cooling structure with oil circulation in the housing, oil spray at winding ends and rotor end surface is firstly proposed for the PMaSynR S/G. Then the accurate loss calculation of the PMaSynR S/G is proposed, which includes air gap friction loss under oil spray cooling, copper loss, stator and rotor core loss, permanent magnet eddy current loss and bearing loss. The parameter sensitivity analysis of the hybrid cooling structure is proposed, while the equivalent thermal network model of the PMaSynR S/G is established considering the uneven spraying at the winding ends. Finally, the effectiveness of the proposed hybrid cooling method is demonstrated on a 40 kW/24000 r/min PMaSynR S/G experimental platform.