An experiment to estimate the revolution of DC motor  

作　　者：N K Acharya A N Prajapati 

机构地区：[1]Applied Physics Department,Faculty of Technology and Engineering,The Maharaja Sayajirao University of Baroda,Vadodara-390001,India

出　　处：《Journal of Measurement Science and Instrumentation》2013年第1期10-13,共4页测试科学与仪器（英文版）

摘　　要：In this paper we have reported a simple and cost effective lab level experiment to determine the revolution of DC motor at various voltages.This experiment is designed on the basis of laser light pulses observed in cathode ray oscilloscope(CRO)output through an aperture.These output waveforms are directly related with the revolution of DC motor.A laser light beam was allowed to pass through a slot attached with the shaft of DC motor.The outcoming light is in the form of light pulses that falls on the photodetector which was connected to CRO.The frequency of light pulses is the function of applied voltage to DC motor.The CRO output was measured at different voltages.The visual waveforms on CRO interpret the different values of revolutions per minute(rpm)at different values of voltages given to DC motor.Analysis was made to determine the voltage depended revolution.In this paper we have reported a simple and cost effective lab level experiment to determine the revolution of DC motor at various voltages. This experiment is designed on the basis of laser light pulses observed in cathode ray oscilloscope （CRO） output through an aperture. These output waveforms are directly related with the revolution of DC motor. A laser light beam was allowed to pass through a slot attached with the shaft of DC motor. The outcoming light is in the form of light pulses that falls on the photodetector which was connected to CRO. The frequency of light pulses is the function of ap- plied voltage to DC motor. The CRO output was measured at different voltages. The visual waveforms on CRO interpret the different values of revolutions per minute （rpm） at different values of voltages given to DC motor. Analysis was made to de-termine the voltage depended revolution.

关 键 词：cathode ray oscilloscope(CRO) REVOLUTION DC motor laser source PHOTODETECTOR 

分 类 号：TM33[电气工程—电机]