在启动时，没有反电动势，在无传感器模式下电机的位置不能检测到。

At startup, there is no back-EMF due to the stationary motor, and the motor position cannot be detected in sensorless mode.

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试想想，现在的机器可以检测到电话，随着国际互联网和唤醒从待命模式，以服务呼叫没有任何错过。

Just imagine, now the machine can detect phone call over the Internet and wake up from standby mode to serve the call without any miss.

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在开发模式下，勾选也执行第二次变更检测周期，以确保检测没有进一步的变化。

In development mode, tick also performs a second change detection cycle to ensure that no further changes are detected.

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