The estimation method can accurately track the diversity of permanent flux and is robust to motors' parameters.
该方法能准确跟踪永磁体真实状况，对电机参数不敏感，鲁棒性强。
The distribution of magnetic flux of track eddy current braking device is calculated by using vector potential method.
采用矢量位A法对线性涡流制动装置的磁场分布进行了有限元理论计算。
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