Energy Consumption Minimization of Squirrel Cage Induction Motor Using Classical Optimal Controller Techniques

Energy insufficiency is one of the major problems in the world today due to the growing population. Induction motor is used in many industries due to its low cost, and low maintenance cost. The influence of these motors in terms of energy consumption in energy intensive industries is significant in total input cost. For the industry to remain in the competition, its running cost and power consumption must be minimized. When an induction motor work close to its rated torque, and speed at a light load, there is usually no balance between the copper and iron losses resulting in a reduction in efficiency of the motor and high power consumption, leading to temperature rise and noise is generated. This article focuses on minimizing the energy consumptions of the induction motor using the classical optimal controller technique. This was achieved by minimizing the stator current to the least possible value by optimizing the stator current for a given torque. The stator voltage values of the induction motor were varied by varying the modulation index Ma using the principle of constant flux. The classical optimal control system which uses information on the torque of the motor was used to generate the appropriate voltage amplitude that minimize the induction motor stator current. The classical optimal current controller models were configured for a set of experimental data using the information generated for the approximate minimum stator current value according to fitness functions. The models were implemented using MATLAB Simulink toolbox and were validated by simulation using a typical three phase induction motor of 4000W, 400V at a nominal frequency of 50Hz. From the result, it was observed that at minimum load torque of 2Nm and phase voltage of 230.94V, the power consumed was 1290W when the open loop method was used but it was reduced to 503.45W when the classical control method was used. Reducing the power consumed by 60.97 . Again, at a load torque of 10Nm, the power consumed was 1489W when the open loop method was used and 1173.17W when the classical control method. Minimizing the power consumed at a load torque of 10Nm by 21.2 . It was also observed that at load torque of 20Nm to the maximum torque of 26.7Nm, the amount of current drawn and the power consumed were the same when the open loop method and the classical control method were used. The results at different frequencies show that when implementing the classical optimal current control method, the stator current and power consumption were highly minimized when compared to the open loop method. Asiwe, Uchechukwu M. | Uju, Isidore U. | Iloh John Paul "Energy Consumption Minimization of Squirrel Cage Induction Motor Using Classical Optimal Controller Techniques" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-6 | Issue-4 , June 2022, URL: https://www.ijtsrd.com/papers/ijtsrd50056.pdf Paper URL: https://www.ijtsrd.com/engineering/other/50056/energy-consumption-minimization-of-squirrel-cage-induction-motor-using-classical-optimal-controller-techniques/asiwe-uchechukwu-m