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采用空载实验法，即用测功机带动被测永磁同步电机以一定的转速旋转，同时保持被测电机负载开路，测试此时的电机空载相电压，即为反电势电压。结合转速、反电势可以计算得出相应的反电势系数
请问如何在simulink中实现上述电机被带动效果
