摘要
为研究高速屏蔽电机在运行过程中的涡流损耗和水摩损耗,设计了一台额定功率7.5 kW,额定转速15000 r/min的高速屏蔽电机,通过搭建屏蔽电机湿式空载试验系统进行不同转速下的干式与湿式空载试验,并对比分析了测试结果和电机损耗预估公式计算结果的差异。试验表明:定子屏蔽套涡流损耗和转子与冷却介质间的水摩损耗对高速屏蔽电机的效率影响较大,即使电磁设计较优的高速电机在加入屏蔽套后效率仍然下降约20%~30%;电机损耗预估公式的准确性取决于经验系数的选取,在高速情况下需要修正;通过对定子屏蔽套厚度、屏蔽套材料、电机转子直径等进行优化设计能进一步提高高速屏蔽电机的运行效率。
In order to study the eddy current loss and water friction loss of high-speed shielded motor during operation,a shielded motor with nominal power of 7.5 kW and nominal rotation speed 15000 r/min was designed.The wet and no-load test equipment of shielded motor was built to carry out the“dry-mode”and“wet-mode”no-load tests under different rotational speeds,and the difference between the test results and the calculated results by the empirical formula of shielded motor loss was analyzed.The results show that the eddy current loss of the stator shield sleeve and the water friction loss between rotor and cooling medium have great influence on the efficiency of high-speed shielded motor.Even for the high-speed motor with optimized electromagnetic design,the motor efficiency is still reduced by about 20%~30%after applying the shielding sleeve.The accuracy of existing motor loss calculation formulas depends on the empirical coefficient,and it needs to be modified at high speed condition.Finally,it is recommended to optimize the thickness of stator shield sleeve,the shield sleeve material,the rotor diameter,etc.to further improve the operating efficiency of the high-speed shielded motor.
作者
程诚
王浩明
李小芳
林庆国
CHENG Cheng;WANG Haoming;LI Xiaofang;LIN Qingguo(Shanghai Engineering Research Center of Space Engine,Shanghai Institute of Space Propulsion,Shanghai 201112,China)
出处
《火箭推进》
CAS
2019年第6期66-70,共5页
Journal of Rocket Propulsion
基金
上海市空间发动机工程技术研究中心资助项目(17DI2280800)
关键词
高速电机
屏蔽电机
涡流损耗
水摩损耗
电机效率
high-speed motor
shielded motor
eddy current loss
water friction loss
motor efficiency
