旋转速度低于强制换向频率。
The rotation speed falls below the forced commutation frequency.
直流励磁时间和强制换向时间都由一个外部电容设定。
Each period of DC excitation and forced commutation drives is set with an external capacitor.
当转动频率超过FST引脚状态指定的强制换向频率后，运行模式切换到无传感器运行模式。
When the rotational frequency exceeds the forced commutation frequency specified with the status of the FST pins, the operation mode is switched to the sensorless mode.
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