An experiment to estimate the revolution of DC motor
N K Acharya, A N Prajapati
【摘 要】Abstract：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.【期刊名称】测试科学与仪器【年(卷),期】2013(004)001【总页数】4
【关键词】Key words：cathode ray oscilloscope (CRO); revolution; DC motor; laser source; photodetector
0 Introduction
The main objective of performing this experiment is to measure the speed or revolution per minute (rpm) of DC motor using easily available laboratory equipments. The equipments required to perform this experiment are usually available in any undergraduate/postgraduate laboratory. One can perform easily without procuring additional equipments. The idea is innovative because the people are using various methods including, tachometer, stroboscope and microchip (PIC16F877a) based
electronics to measure rpm of DC motor[1]. This is first proposed cost effective laboratory method to determine the rpm of DC motor by using laser beam and oscilloscope. Because of the distinct properties, laser beam has variety of applications to characterize the physical parameters for verities of systems. Gogoi et al proposed an experiment to determine the size of nanoparticles using scattering of laser light[2].
A DC motor has different characteristics including speed of motor and the most
An experiment to estimate the revolution of DC motor
