直流调速系统是自动调速控制系统的主要形式。
DC driving system is the main form of automatic control system.
其矢量控制系统也是最复杂的交流电机调速控制系统之一。
Its vector control system is one of the most complicated ac adjustable speed control systems.
多年来用调速器控制速度是唯一控制系统频率的措施。
For many years governor speed control was the only available means of controlling system frequency.
多年来用调速器控制速度是唯一控制系统频率的措施。
For many years governor speed control was the only available means of controlling system frequency.
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