polarity or polarizing voltage device 极性或极化电压元件
Has the device automatic identification of polarity?
设备是否具有极性自动识别功能？
The device is equipped with a new type of output current polarity detector, the method is simple and reliable.
装置采用了一种新的输出电流极性检测器，方法简便可靠。
In addition, the current controlling device is used to control the amount and the direction of the current, and thus control the strength of the electromagnetic force and the polarity.
并利用电流控制器来控制电流量的大小与电流的方向性，以达到增减电磁力的强度与磁极的方向。
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