变磁通轴向磁场永磁电机机械动力学分析与弱磁能力研究

摘要

To a mechanically variable flux axial field permanent magnet electrical machine(MVFAFPMEM),the mechanical dynamics simulation and electromagnetic analysis are implemented in this paper to obtain the motion characteristic and angle adjustment capability of the mechanically device,as well as flux weakening ability of MVFAFPMEM.The cam angular acceleration and spring deformation are studied at different speed,so the stagger angle between the two rotors with rotor speed can be obtained by virtual prototype technology named Automatic Dynamic Analysis of Mechanical Systems(ADAMS).The air-gap flux distribution of MVFAFPMEM at different stagger angle is calculated by finite element method(FEM),and its electromagnetic characteristics are studied by adopting the mechanical flux-weakening device.The simulation results show that the stagger angle between the two rotors can vary from 0 to 21(deg)by this device,and a better flux weakening ability is obtained.The corresponding experiments are carried out to validate theory analysis,and it shows that the stagger angle between the rotors can be adjusted automatically by the rotor speed at a wide flux regulation range of MVFAFPMEM.%对机械变磁通轴向磁场永磁电机(MVFAFPMEM)进行机械动力学与电磁场仿真分析,研究机械调磁装置的运动特性、角度调节能力及电机弱磁能力.基于机械系统动力学自动分析(ADAMS)虚拟样机技术,研究了不同转速下凸轮角加速度和弹簧形变情况,获得了转子错开角度随电机转速的变化规律;利用有限元方法计算了转子错开角度变化时的电机气隙磁场,研究了凸轮式机械调磁装置对电磁特性的影响.仿真结果表明,利用所设计的调磁装置,可使电机两转子间的错开角度在0°~21°范围内变化,弱磁能力较强.试验结果验证了理论与仿真分析的正确性,利用凸轮式机械调磁装置能够根据电机转速自动调节两转子间的相对位置,实现轴向磁场永磁电机气隙磁场强度的宽范围调节.