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我厂机修车间使用的MGB1420高精度万能磨床,其头架电机是用闸流管进行调速,存在问题很多。首先闸流管体积大,发热严重,一到夏天就得用电扇给其降温,再有闸流管寿命不长经常坏,外购困难;此外闸流管一定要先开机十分钟等其灯丝加热后才能开动,但有时等了半小时也不能启动,最后是控制部分用双三极管,加上闸流管和电子管需要灯丝,电能又较浪费,所以由于
MGB1420 high-precision universal grinding machine used by our machine shop, the first frame motor is used thyristor speed control, there are many problems. First, the thyristor volume is large, serious heat, the summer had to use the fan to cool it, then the thyristor life is not long and often bad, difficult to outsource; In addition, the thyristor must be turned on for ten minutes and other filament heating After the start, but sometimes waited for half an hour can not start, and finally the control part of the dual transistor, coupled with the thyristors and tubes require filament, the power is more waste, so due to