Fabrication of Test Setup for Speed Control of Three Phase Induction Motor

Abstract

The speed control system for three phase induction motor has variable frequency drive to change the frequency of supply, the rope brake dynamometer to load the motor and proximity sensor for measurement of angular velocity. The Arduino AT Mega Microcontroller is used to control the angular velocity. The set point is set through a potentiometer voltage, which is compared with feedback voltage of frequency to voltage converter interfaced with proximity sensor. Depending on mode of controller set, microcontroller outputs 0-10 VDC, which is interfaced with VFD. The trials are conducted by varying the load through rope pulley break dynamometer. The response of the system for proportional and proportional plus integral controller mode is obtained. The trials are conducted for load ranging from 0.7 kg to 1.4 kg load with set speed of 700 rpm. This paper briefly demonstrates the design and implementation of speed control system for the induction motor for proportional offset and integral mode to reset the offset.