中国电机工程学报2019，Vol.39Issue(7)：1908-1918,11.DOI:10.13334/j.0258-8013.pcsee.182522
考虑机械气隙的无槽永磁直线电机热分析及改进
Thermal Analysis and Improvement of Slotless Tubular Permanent Magnet Linear Actuators Considering the Mechanical Air Gap
摘要
Abstract
In this paper,the mechanical air gap of a natural air-cooled slotless tubular permanent magnet (PM) linear actuator (TPMLA) was investigated,trying to constrain and direct the heat flow in well-defined paths and minimize the PM temperature.Generally,the heat generated by slotless windings must pass through the surrounding air first.For this reason,the heat dissipation condition is much worse than slotted machines.Although a small mechanical air-gap length tends to increase the air-gap flux density,it makes a large portion of heat generated by windings being transferred to the PM side,heating the PM and lowering the remnant flux density of PM.Therefore,a proper mechanical air gap is of great importance for PM temperature of slotless TPMLA.Electromagnetic and thermal models were established,and were compared with finite element models.Three prototypes of slotless TPMLAs having different mechanical air-gap lengths were built and tested.The effect of mechanical air gap on constraining and directing the heat flow is greatly prominent,which shows that the attempt to minimize PM temperature of TPMLA by increasing its mechanical air-gap length properly is highly effective.关键词
气隙/无槽永磁直线电机/永磁体温度/集中参数热网络模型Key words
air gap/slotless permanent magnet actuator/PM temperature/lumped-parameter thermal network分类
信息技术与安全科学引用本文复制引用
龙兴,罗辞勇,陆治国,李景灿,孙军..考虑机械气隙的无槽永磁直线电机热分析及改进[J].中国电机工程学报,2019,39(7):1908-1918,11.基金项目
国家自然科学基金项目(51607017) （51607017）
国家“111”计划项目(B08036).Project Supported by National Natural Science Foundation of China (51607017) （B08036）
National "111" Plan of China (B08036). （B08036）
