电推子电路及拆改记录笔记

电推子拆解及维护、修理

下图是电推子的拆解图，

 

1、拆解时，刀头向外一推，即可拆下来。

2、充电电源为开关电源，原理图见附图；实测空载输出电压为直流约7~8V左右                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     

3、电推子的电机是直流2.4V的小电机；

4、电推子开始用了约3年,发现蓄电池不能储电，只好更换电池，第一次把原600mAh 的两节镍镉电池換成了1800 mAh的镍氢电池，用了5年后。又发现充满电后，用一会儿就没电了，只好再一次更換电池，与时俱进，随着市场上新型电池的出现，买了磷酸铁锂可充电电池[电压3.2V/容量900毫安小时(mAh)]，两节并联，以增大容量，延长使用时间。更换成磷酸铁锂电池后，电压从原来的2.4V左右，提高到3.2V, 理发推子强劲有力，使用正常，电压有些偏高，串联一只1N4001二极管，可以降低0.7V左右, 基本满足原电机的供电电压。（实测电机电流约160毫安左右）

5、电路图：在充电的同时，如果使用电推子，30Ω电阻会并联在二极管上，提供一条通路，似乎作用不大。

6、恢复安装复位时，需要注意调节剪头发长短的调节齿轮位置，要安装合适。