controlled circulation ventilation
controlled circulation ventilation
控制循环通风
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 system is designed as circulation absent and A-A VF controlled one, in which a responsive motor driving the main ventilation fan is controlled in a vector control technology without speed sensor.
系统采用无环流交-交变频控制方案、应用无速度传感器的矢量控制技术对拖动煤矿主扇风机的感应电动机进行控制。
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