【摘要】 首次提出在永磁电机中使用导磁紧圈,同时使用磁路法、作图法及有限元法计算紧圈材料对气隙磁通的影响,并对两种典型结构的永磁电机进行计算,均说明使用导磁紧圈可比使用非导磁紧圈获得更大的气隙磁通;而比使用焊接紧圈成本低、工艺简单.样机的实验结果与计算结果是一致的.更多还原

【Abstract】 Either non-magnetic rings or welded rings consisting of alternate magnetic and non-magnetic seg-ments are used at present to hold in place the magnets and pole pieces of high-peripheral-speed rotor ofpermanent magnet (PM) machines[1～4].The authors use three different methods-equivalent magneticcircuit method,graphical method and finite element method-to prove that magnetic rings can also beused for PM machines and are better than the above-mentioned two types of rings.The contributions of this paper are believed to be:1.The authors are the first to propose using magnetic rings in PM machines and to prove that theamount of air gap flux of a PM machine with a magnetic ring is greater than that of a PM machine with anon-magnetic ring.Compared with a PM machine with a welded ring,the use of magnetic ring insteadcan lower product cost and make technology process simpler.2.The authors are the first to compare the amounts of air gap fluxes of PM machines obtainable withdifferent ring materials and to derive two important calculation formulas,e.g.,eqs.(4) and (5).Two types of PM machines are computed and tested.One is a rare-earth cobalt PM synchronousgenerator used in areospace and the other is a rare-earth NdFeB PM motor used in textile industry.Thecomputed results are in good agreement with test results.更多还原