无刷直流电动机转子涡流损耗及其对温度场影响  

Calculation of Rotor Eddy Current Loss in Surface Mounted Brushless DC Motor and Influence to Its Thermal Field

作　　者：张明慧[1,2] 刘卫国[1] 赵南南[2] 

机构地区：[1]西北工业大学,陕西西安710072 [2]西安建筑科技大学,陕西西安710055

出　　处：《微特电机》2013年第10期16-19,22,共5页Small & Special Electrical Machines

摘　　要：转子涡流损耗主要由绕组电枢磁场的空间谐波和时间谐波以及槽开口引起的气隙磁阻变化产生。表贴式永磁无刷直流电动机由于其永磁体和保护套材料具有较好的导电性能,因此会在转子内产生一定的涡流损耗,引起转子发热。采用时步有限元方法,针对一台额定功率30 kW、4极3相,额定转速8 000 r/min的表贴式永磁无刷直流电动机,分别计算了空载和负载时转子永磁体及保护套内的涡流损耗。同时也对比分析了将保护套材料由不锈钢改为碳纤维后,转子内涡流损耗的变化情况,研究了保护套材料属性对损耗及温度场的影响。通过与样机温升实验的数据对比,说明该涡流损耗计算模型有一定的精度和准确度,对电机的优化设计具有指导意义,有较好的工程应用价值。Rotor eddy current losses are mainly caused by time harmonics and space harmonics in the stator armature magnetic field and the variation of airgap reluctivity due to slotting. Rotor eddy current loss is usually significant in surface mounted brushless DC motor because of the high electric conductivity in permanent magnet and retaining sleeve. The rotor eddy current losses in load condition and no load condition were calculated by time-step FEM method for a 30 kW,4-pole, 3-phase,surface mounted brushless DC motor when its rotating speed was 8 000 r/min. The influence of retaining sleevre material to loss and thermal field was analyzed and compared between stainless steel and carbon fiber. Compare to the data of temperature experiment, the calculation result is reasonable and valuable for the motor optimization design and engineer-ing application.

关 键 词：永磁无刷直流电动机 保护套 涡流损耗 有限元 温度场 

分 类 号：TM33[电气工程—电机]