金属切削机床的电动机功率是根据机床最大切削量来选定的。我厂机床加工时,电机大部份是处在轻负载情况下,电机的功率因数很低,无功功率损耗大,浪费电力。如果将电机由原来的△接法换为Y接法,电机在轻载时就能提高功率因数,减少无功功率损耗,节约电力。但是,当电机重载时要保证出力,又必须立即换成△接法,为适应机床加工的实际需要,电机在运行中△和Y接法必须能自动切换。我厂已在大中小型机床上 Metal cutting machine motor power is based on the maximum amount of cutting machine to be selected. I plant machining, most of the motor is under light load conditions, the motor power factor is very low, reactive power loss, waste of power. If the motor from the original △ connection for the Y connection, the motor at light load can increase the power factor, reduce reactive power loss and save electricity. However, when the motor overload to ensure that the output, but also must be replaced immediately △ connection, in order to meet the actual needs of machine tools, motor operation △ and Y connection must be able to automatically switch. I plant in large, medium and small machine tools