摘要
为研究悬浮绕组结构及其磁势空间谐波对无轴承交替极永磁电机悬浮特性的影响,在计及悬浮磁势空间谐波条件下,推导了电机悬浮力表达式。同时,定义径向力/电流刚度、径向力脉动率和径向自由度最大耦合率等3个参数量化分析径向力特性。在此基础上,在相同定转子结构下,研究了集中式、分布式、环形式以及带辅助线圈的集中式等4种悬浮绕组结构,并对各悬浮绕组磁势空间谐波及其影响进行分析。从降低悬浮磁势空间谐波和提高悬浮性能角度出发,提出一种带辅助线圈的集中式绕组以及悬浮磁势总谐波畸变最小的辅助线圈绕组系数优化方法。通过有限元分析,定量研究4种悬浮绕组结构下的悬浮特性,从而量化悬浮磁势空间谐波含量与悬浮特性的关系,为无轴承交替极永磁电机悬浮系统设计提供指导。
To study the influence of suspension winding structure as well as its space harmonic of magnetic motive force （MMF） on suspension performance of bearingless consequent-pole permanent magnet motor, the expressions of suspension force with consideration of space harmonic of MMF was deduced. Meanwhile, three performance parameters, such as sus- pension force/current stiffness, ripple rate of suspension force and maximum radial coupling degree, were defined for quan- titative analysis of suspension performance. Four topologies of suspension winding, such as concentrated winding, distribu- ted winding, toroidal winding and concentrated winding with auxiliary coils were investigated, space harmonic of MMF and influence of which were analyzed. In order to reduce content of space harmonic and improve suspension performance, an optimization method of winding coefficient in concentrated winding with auxiliary coils was proposed based on minimization of total harmonic distortion （THD） of suspension MMF. The influence of topologies of suspension winding on suspension performance was studied quantitatively by finite element analysis and the relationship between suspension performance and space harmonic content of suspension MMF is pointed out. All results can be utilized as design considerations for bearing- less consequent-pole PM motor.
出处
《微特电机》
北大核心
2017年第9期12-17,共6页
Small & Special Electrical Machines
关键词
无轴承电机
交替极
绕组结构
空间谐波
悬浮性能
bearingless motor
consequent-pole
winding structure
space harmonic
suspension performance
