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LabVIEW for Motor Speed Control

Satyaveda Bharath Kalisha Robinson South Carolina State University

Project Title: Remote Data Acquisition and Motor Control via Internet for SpaceApplication Project Goal: To control position of a robot arm remotely via Internet Group Goal: We are responsible for the construction of the robot arm Preparation: Become familiar with LabVIEW Becomefamiliar with Pulse Width Modulation




Open-Loop DC motor speed control system Pulse Width Modulation (PWM) isemployed to control the speed of the motor A virtual instrument (vi) is developed with LabVIEW The vi generates a triangular wave that produces the desired PWM signal. PWM is an analog that switchesbetween two predefined limits.


User inputs the amplitude and frequency of the triangular wave, sampling rate of the reference signal, and the desired amplitude ofthe PWM. As the reference voltage increases, the width of the PWM(duty cycle) increases which in turn increases the speed of the motor. The varying nature of the motor speed is demonstrated in thelaboratory by changing the reference signal. The principle developed in this project will be utilized in future endeavor toward controlling the robot motion remotely via Internet

• Project Description
The major components of the complete system include and input circuit, and output circuit, and a microcomputer with DAQ board and LabVIEW software.

Input Circuit

Computer & DAQBoard

Output Circuit

figure 1

Project Description
The input circuit shown in Fig. 2 is a simple voltage divider that employs a potentiometer and two power supplies. It provides a variablereference signal within a range of –15V and +15V.

Figure 2

Project Description
* In the output circuit , a dc motor is connected between the collector of the power transistor TIP 41 and the...
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