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通用铣床主轴制动,进给及快速等功能均靠电磁离合器的吸合、切换得以实现。其工作回路一般都采用控制变压器二次侧输出的36V交流电经桥式整流成直流电后供电。经实测,加在电磁离合器上的瞬间吸合电压达32V左右,吸合后工作电压28V,超出其额定电压24V的15％,使其处于过压工作状态而容易损坏。对此,采用以下方法可有效延长电磁离合器的电寿命。 对于36V绕组在最外层的控制变压器,如若外加电压380V较为稳定,可将绕组匝数减少至输出端电压为31V即可。对于36V绕组不在最外层的,加
Universal milling machine spindle brake, feed and quick and other functions are based on electromagnetic clutch pull, switch can be achieved. The work of the loop are generally used to control the secondary side of the transformer output 36V AC by the bridge rectifier to DC power supply. After measured, the electromagnetic clutch on the moment of pull-up voltage of 32V or so, pull the working voltage 28V, exceeding its rated voltage of 24V 15%, making it over-voltage operation and easy to damage. In this regard, the following method can effectively extend the electrical life of the electromagnetic clutch. For the 36V winding in the outermost control transformer, if the applied voltage is more stable 380V, the number of windings can be reduced to the output voltage of 31V. For the 36V winding is not in the outermost, plus