基于滑动磁桥的永磁电机机械弱磁性能研究
Research on mechanical flux weakening performance of permanent magnet synchronous motors based on sliding magnetic bridges
摘要
针对轨道交通永磁电机在故障工况下因磁场无法调节而引起发热与振动加剧的问题,考虑故障导向安全原则,文章提出一种基于滑动磁桥的磁场可调永磁同步电机,利用电机拓扑变换实现正常工况下牵引电机的转矩输出与故障工况下电机的磁场调节.文章通过分析电机转子漏磁阻对电机磁链及直轴电感的影响,研究滑动磁桥工作位置变换对电机永磁磁链的调节作用,实现了对故障电流及运行转矩脉动的削弱.研究结果表明,基于滑动磁桥的磁场可调永磁同步电机在保证电机输出的同时能够通过拓扑变换削弱主磁通、增大直轴电感,减小故障电流及拖动转矩的脉动,从而削弱故障运行中产生的电磁损耗和机械振动,实现电机故障导向安全设计.
To address the increased heating and vibration caused by the inability to regulate the magnetic field of permanent magnet synchronous motors(PMSMs)used in rail transit under fault conditions,this paper proposes a magnetic-field-adjustable PMSM based on a sliding magnetic bridge according to the fault-oriented safety principle.The motor's topological transformation was used to realize the traction motor torque output under normal conditions and the magnetic field regulation under fault conditions.The influence of the rotor leakage reluctance on the motor flux linkage and d-axis inductance was analyzed,and the regulation effect of the sliding magnetic bridge's operating position on the permanent magnet flux linkage was investigated.Consequently,the fault current and the operating torque ripple were effectively reduced.The results demonstrate that the proposed motor ensures the motor output,weakens the main flux and increases the d-axis inductance through topological transformation,and reduces the fault current and drag torque ripple,thus mitigat-ing the electromagnetic losses and mechanical vibrations during fault operation and achieving a fault-oriented safety design for the motor.
年，卷(期)：
2026, (1)
分类号：
U264.1
TM351
机标分类号：
TM351
U266.2
TP393
在线出版日期：
2026年6月8日
基金项目：
2021YFB3803000:国家重点研发计划，
