Analysis of Speed Control of Three Phase Induction Motors with Constant Voltage Frequency Ratio

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Analysis of Speed Control of Three Phase Induction Motors with Constant Voltage Frequency Ratio

Freier Zugriff

Thank God Ichem / Emmanuel Chinweikpe Obuah / Wonodi Ikonwa / Christopher Okechukwu Ahiakwo

Due to their dependability, low cost, and robustness, induction motors are the most widely used electrical motors. However, induction motors is a constant speed machine; hence it speed control is difficult. Electric drive system is increasingly required to meet the higher performance and reliability requirement of motors used in industrial applications. This work presents speed control of a three-phase induction motor with constant voltage frequency (v/f) ratio scheme with peripherial intergral (PI ) controller. In this method of constant v/f ratio, by use of rectifier and pulse width modulation (PWM) inverter, the supply voltage as well as the supply frequency is varied such that the voltage and frequency ratio of the motor remains constant and the flux remains constant too. Dynamic equations of the motor were written as well as the steady state equation based on Parks two-axis theorem. The equations were validated in MATLAB. With reference speed of 1500 rpm at diiferent load, results shows that the maximum torque of the motor remains unchanged at different operating zone for various speeds and given load, the maximul torque being 2.2 Nm at steady state opration. The work was done using a three-phase, 4-pole 50Hz, 155 volts, 1.8 kW induction motor.