大学物理 ›› 2019, Vol. 38 ›› Issue (12): 36-.doi: 10.1685 /j.cnki.1000-0712.180703

• 物理实验 • 上一篇    下一篇

关于手摇式静电感应起电机原理

路峻岭,顾晨,秦联华,任乃敬,马泊一   

  1. 清华大学物理系,北京100084
  • 收稿日期:2018-12-28 修回日期:2019-04-04 出版日期:2019-12-20 发布日期:2020-01-22
  • 作者简介:路峻岭( 1946—) ,男,河北南宫人,清华大学物理系教授,主要从事大学物理教学和传感器敏感元件物理学的研究工作.
  • 基金资助:
    教育部“基础学科拔尖学生培养试验计划”项目( 20160204) 资助

Principle of hand-operated electrostatic induction motor

LU Jun-ling,GU Chen,QIN Lian-hua,REN Nai-jing,MA Bo-yi   

  1. Department of Physics,Tsinghua University,Beijing 100084,China
  • Received:2018-12-28 Revised:2019-04-04 Online:2019-12-20 Published:2020-01-22

摘要:

手摇式静电感应起电机,在手柄沿顺时针方向摇动时是一个具有正反馈特征的电荷放大器.若莱顿瓶电容上存在一定的初始电荷,则在电容电极外露部分所带电荷产生的静电场中,在金属电刷上出现静电感应,正负电荷将出现在电刷的两端部,绝缘转盘转动时它上面的导体箔片在滑扫过电刷端部的金属毛刷后即带上了净电荷,带有正负净电荷的导体箔片随绝缘转盘转动,在分别至连接莱顿瓶电容电极的正负极集电叉时,都通过尖端放电向莱顿瓶电容充电,莱顿瓶电容中的电荷越来越多.这就是起电机工作的物理过程.

关键词: 电荷, 导体, 静电感应, 尖端放电, 莱顿瓶电容器

Abstract:

Hand-operated electrostatic induction motor is a charge amplifier with positive feedback when the handle moves clockwise. If there is a certain initial charge on the capacitor of Leighton bottle,the electrostatic induction will appear on the metal brush generated by the charge on the exposed part of the capacitor electrode,and the positive and negative charges will appear at both ends of the brush. When the insulation turntable rotates,the conductor foil on it will carry net charges after sliding through the metal brush. When conductor foils meet collector forks connected to the capacitor electrodes of the Leighton bottle separately, the Leighton bottle is charged by the tip discharge,and the charge in the Leighton bottle is increasing.

Key words: charge, conductor, electrostatic induction, tip discharge, capacitor of Leighton bottle