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。
When the beneficial effects of activity on the heart and circulation and indeed on all the body's systems are absent, everything measurable begins to go awry.
当活动对心脏和血液循环及身体上所有的系统确实有利影响缺席，可衡量的一切开始出差错。
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