摘要
烧结钕铁硼优异的磁性能推动了永磁同步电机小型化、高能效的发展,但是工作环境中的反向磁场、异常温升及机械振动等因素都有可能导致不可逆退磁,严重影响电机的输出功率和扭矩,甚至造成严重的电机故障。目前不可逆退磁风险的评价大多是针对材料磁通量衰减的宏观表征。本文在非装机状态下模拟电机实际工作过程中反向磁场可能导致的局部不可逆退磁行为,并对材料局部退磁行为和材料微观结构进行了研究,对永磁电机实际工况下材料的应用风险评估和风险控制具有重要参考价值。
Sintered NdFeB with excellent magnetic properties promote the miniaturization and high energy efficiency development of permanent magnet synchronous motors.However,permanent-magnet can be subject to an inherent risk of irreversible demagnetization when operating under a large demagnetizing magnetic field,abnormal high temperature or strong mechanical vibration.Irreversible demagnetization seriously affects the output power and torque of the motor,and may even cause serious motor failure.Up to now,risk assessment of irreversible demagnetization is mainly based on the macroscopic characterization of material flux loss.In this work,local irreversible demagnetization behavior caused by the demagnetizing magnetic field is simulated in motors.The local demagnetization behavior and the microstructure of the material are studied experimentally.It can be used for the application risk assessment and risk control of the material under the actual working condition in motors.
作者
师大伟
Shi Dawei(Xiamen Tungsten Co.,Ltd.,Xiamen 361009,Fujian)
出处
《福建冶金》
2019年第6期20-22,共3页
Fujian Metallurgy
基金
2016年福建省科技厅STS计划配套项目
关键词
稀土永磁
烧结钕铁硼
局部退磁
微磁结构
Rare earth permanent magnet
Sintered NdFeB
Local demagnetization
Magnetic microwtructure
