摘要
针对初级有限长的直线弧形感应电机和直线感应电动机的特殊现象——空载速度超过所谓的同步速度,以简化的单边直线感应电机(single-sided linear induction motor,SLIM)模型为研究对象;利用麦克斯韦方程组建立了该电机的数学解析模型,计算了动态纵向端部效应影响下电机气隙磁场和端部磁场分布;提出了考虑纵向端部效应的新物理量"等效电磁极距",给出不同极数时机械极距的修正系数。通过有限元法(finite element method,FEM)仿真和样机试验验证了解析法结论的合理性和修正系数的正确性,得出结论:空载速度并未超过由等效电磁极距计算而得的同步速度,只是超过由机械极距计算而得的同步速度。对于今后该类电机的理论研究和应用具有一定的参考价值。
There is a special phenomenon in linear arc-shaped motor and linear induction motor with finite-length primary. Their no-load rotating （ translational ） speeds exceed the so-called synchronous speed. With a simplified single-sided linear induction motor（ SLIM） as the research object, the mathe-matical model of the motor was established by using Maxwell＆#39;s equations. Air gap and end region magnetic field distribution considering dynamic longitudinal end effect was calculated. A physical quantity “Equivalent electromagnetic pole pitch” considering the dynamic longitudinal end effects was proposed and correction coefficients corresponding to mechanical pole pitch with different number of poles was given. Finally, the rationality of the analytical method and validity of correction coefficients were verified by finite element method（ FEM） simulation software and prototype testing. It can be concluded that no-load speed does not exceed the synchronous speed calculated by “Equivalent electromagnetic pole pitch” and just exceeds the synchronous speed calculated by mechanical pole pitch. It has some informative values to the theoretical research and development of linear induction motor.
出处
《电机与控制学报》
EI
CSCD
北大核心
2014年第7期37-43,共7页
Electric Machines and Control
基金
国家自然科学基金(51277054
U1361109)
教育部博士学科点专项科研基金(20104116120001)
关键词
直线电机
端部效应
空载速度
等效电磁极距
极数
linear motors
end-effect
no-load speed
equivalent electromagnetic pole pitch
number of poles
