【摘要】 研究了永磁同步电动机空载电势的最佳取值问题．导出了计算空载电势的公式，空载电势与功率因数、过载倍数、效率及起动特性的关系．最后给出计算实例，并结合实验结果进行了分析讨论．更多还原

【Abstract】 The authors have not found papers in the open literature dealing with the selection of back emf of Permanent Magnet(PM) Synchronous Motors (SM). The authors bold the view that this is so b～usc developed countries possess already invcrter-fed PM motor drives, which are better than line-start PMSM ones.The contributions of this paper are:(1) The authors put forward for the first time equations for computing back emf of PASM with acceptablc accuracy. The software of computing back emf makes use ofeqs.(2) and (8).(2) The relationships between back emf and power factor, overload capacity, efficiency and starting performance are given in eqs.(1),(5),(8) and (9).The equations have been applied to the design of a 0.8kW rare-earth PMSM. 25,000 such PMSM drives have been put in use by textile manufacturers. Compared with previous PASM drives. the amountof rare-earth PM material used drops from 0.49 kg to 0.34 kg, while motor efficiency and power factor remain to be 91% and 90% respectively.更多还原