Speed control system of three-phase induction motor
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Date
2019-06
Authors
Muhammad Syauqi Bin Mohd Yahaya
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Abstract
Controlling the induction motor speed efficiently is a main concern nowadays as it can reduce energy consumption, increase better production and can reduce maintenance. This project is about to design a speed control system of three phase induction motor using combination of Arduino microcontroller and gate driver hardware. Among the various methods of speed control for the induction motor, variable frequency variable voltage with constant ratio (V/F) control method or also known as variable frequency drive is presented in this project. Pulse width modulation (PWM) technique is used to configure variable frequency method. PWM can be generated by implementing a proper algorithm program using Arduino software in which Arduino microcontroller takes input from the user and generates pulse width modulated signals which will be the reference signal for the inverters to control the speed of the induction motor. An open loop system is proposed to control the speed of the motor in this research. An IC of Infineon IGCM10F60GCA Intelligent Power Module (IPM) is used in this project as the gate drive for induction motor and objective of developing a speed control system by utilizing the microcontroller and gate driver hardware will be prioritised. The testing procedures are conducted on laboratory setup as the availability access on induction motor and high voltage are limited. However, the experimental test cannot be accomplished as the main component, the gate driver is observed giving fault output. Thus, a software simulation is conducted to simulate the working of the project design using MATLAB Simulink. The results of the simulation are produced in terms of output signal of the three phase gate driver and the validity of the speed control system by utilizing variable frequency drive method. The output waveform of PWM switching is also observed in order to verify the project design is constructed in a correct manner. For speed control testing, the simulation shows the speed produced on no-load condition when 60 Hz of frequency supplied is 1800 rpm. After load is injected at 5 Nm, the speed reduced to 1771 rpm. V/F control test is simulated on design circuit and proper results were obtained where variable frequency with variable voltage can produce constant air gap flux at value of 1.25 through operation range. This results show that the project design is working in a correct manner as its follows the theoretical explanation.