组合转子电机稳定性和负载性能比较研究

Compare the Operating Performance of Combined Rotor Machine

组合同步电机的转子由高密度轴向叠片各向异性和面贴式永磁段组合而成,两段转子d轴偏转角对电机的性能有很大影响。用小信号模型分析两段d轴重合和两段d轴偏转角为90°的组合转子电机在变频器供电开环空载起动下稳定性;推导了两种电机的最大负载能力的关系。得到两段d轴重合的组合转子电机存在不稳定频率区,两段d轴偏转角为90°的组合转子电机能从零速同步升速到额定转速稳定运行,且最大负载能力与两段d轴重合的组合转子电机的比近似为凸极比的3/2次方。实验结果与理论分析一致,表明两段d轴合适的偏转角能提高电机的运行性能。

The rotor of combined synchronous machine is made of an axially-laminated anisotropic reluctance part and surface permanent magnet part a separately mounted on the same shaft.Angle between two part rotor d-axis has great influence on the performance.In this paper,small-signal model was used to analyze the combined rotor machines of two-part rotor d-axis coincide and angle 90° of between two part rotor d-axis with open-loop starting by inverter under no-load.The relationship of maximum load capacity of the two machines was derived.The results show that the rotor motor of two-part d-axis coincidence has instability frequency zone.The combined machine of angle 90° of between two-part d-axis can run stably from zero speed to rated speed,and the ratio of the maximum load capacity with the motor of two-part d-axis coincidence is approximately saliency ratio 3 /2 power.Experimental results show that appropriate angle between two-part d-axis can improve operating performance of the combined rotor machine.