电动机实际运行时，电流一般是随负载和电网电压的改变而变化的，因此，电动机稳定温度也是变化的。
During actual operation of electric motor, the electric current is generally variable by the changes of the load and the main voltage, so, the electric motor equilibrium temperature is also variable.
采用负载法计算永磁同步电动机的参数，使参数中的材料特性真正反映了实际负载条件下磁介质的饱和情况。
Load method is used to calculate the parameters of PMSM, in which the material characteristics reflect the magnetic saturation under actual operation.
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