在对复卷机控制系统的改造中，我们用交流传动代替直流传动，用变频器对交流电机进行调速控制。
In the alteration of the rewinder's controlling system, DC driving is replaced by ac driving, and frequency governors are used to control the ac motors.
风洞中交流电机调速器、直流电机调速器及继电器等动力设备运行时将产生强干扰。
When the power machines of wind-tunnel work such as alternating-current machine governor and direct-current machine governor and relay, they will bring about strong interference.
根据驱动电机的不同，可以把空调风机调速方法分为直流调速和交流调速两种。
According to the kind of driving machines, the speed-varying methods of air-conditioner fans can be classified into two kinds: DC speed-varying and ac speed-varying.
根据驱动电机的不同，可以把空调风机调速方法分为直流调速和交流调速两种。
According to the kind of driving machines, the speed-varying methods of air-conditioner fans can be classified into two kinds: DC speed-varying and ac speed-varying.
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