一种减小磁悬浮开关磁阻电机损耗的新方法

A new method to reduce loss of bearingless switched reluctance motors

为满足飞轮储能、生物、医疗等应用领域对磁悬浮电机低功耗运行、温升小的性能要求,提出一种减小磁悬浮开关磁阻电机(BSRM)运行损耗的新方法.基于麦克斯韦应力法,建立转子偏心时的悬浮力与转矩模型,利用有限元方法验证该模型的有效性与精确性.分析转子偏心对悬浮电流与转矩的影响,构建电机铜损耗与铁心损耗模型,并建立了控制系统,利用Matlab软件对BSRM在不同转子稳定平衡位置下的铜损耗、铁心损耗和平均转矩进行仿真比较.结果表明,当转子稳定平衡位置偏心50μm时,BSRM铜损耗和铁心损耗分别降低15.5%和10.8%,同时平均转矩增加4.8%;在BSRM稳定悬浮运行区间内,通过转子的偏心控制可以实现BSRM稳定可靠的低损耗运行.

To meet the performance requirements of low power consumption and small temperature rise of bearingless motors in flywheel energy storage,bioengineering and medical fields,a new method for reducing operation loss of bearingless switched reluctance motor（BSRM） was proposed.The suspension force model and the torque model with the consideration of rotor eccentricity were built based on Maxwell stress tensor method.The model availability and accuracy were verified by finite element method.The influences of rotor eccentricity on suspension current and torque were analyzed to build copper and iron loss models of BSRM.The control system was designed.The copper loss,iron loss and average torque of BSRM were simulated by Matlab with different eccentricity.The results show that copper loss and iron loss are respectively reduced by 15.5% and 10.8% with increased average torque of 4.8% when rotor is steady with eccentricity of 50 μm.The steady operation of BSRM with low loss can be realized by controlling rotor eccentricity in the region of steady magnetic suspension.