the closed-loop timing system
the closed-loop timing system
闭环定时系统
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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The part of timing is a double closed loop DC timing system, and it is composed of rev loop (internal loop) and current loop (external), which are series-wound.
调速部分为双闭环直流调速系统，由转速环(内环)和电流环(外环)串联组成。
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