我厂有四台线切割机床,其走丝电机的换向是靠两个水银廾关作换向反转的。当时所用水银开关为5A的,经常爆坏。由于缺少备品,有时往往停机待修,或是用两个交流接触器代用。针对这个问题,我们在线路上加了三个限流电阻(如下图所示),串接在线路上(限流电阻系用1KW电热丝一根分成三段使用)。经过反复试验,避免了水银开关的爆坏,同时还有两个 I have four factory-line cutting machine tools, which take the wire motor commutation is based on two mercury 廾 off for the reversal of the reversal. At that time the mercury switch used for the 5A, often explode. Due to lack of spare parts, sometimes often down for repair, or with two AC contactor substitution. In response to this problem, we added three current limiting resistors on the line (as shown below), connected in series (current limiting resistor is divided into three sections using 1KW heating wire). After repeated tests, to avoid the mercury switch explosion, while there are two