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In this paper, an attempt is made to introduce an indigenously made three-phase inverter feeding power to the three-phase induction motor. The developed three-phase inverter could be operated and controlled either manually using speed settings or by remotely using the Internet of Things (IoT). The proposed drive consists of three-phase inverter made of IGBTs and heat sinks, driver circuit designed using simple and low-cost ICs and other passive components, and the controller with Wi-Fi support. The detailed design of the drive system is presented in the paper. Also, the developed drive system is tested using a hardware prototype and the results are presented.
Adjustable speed drives have occupied almost all the induction motor applications including industries, domestic, sea way transport, air way transport and the road way transport etc -. The speed control of an induction motor is achieved using the inverter connected to the stator of the motor. The power semiconductor devices of the inverter are controlled (turning ON and OFF) by a controller. However, the controller which works at lower power levels cannot be directly connected with the inverter switches. So, an intermediate circuit is required to isolate the low power controller with the high power inverter circuit . Hence, often this intermediate circuit is termed as gate driver circuit, which is the most important part of an electrical drive system.
The three-phase inverter designed and developed indigenously in the laboratory is presented in this paper. The details of all the components used in the electric drive system are briefed. Also, the pulse width modulation technique used to program the controller and to operate the inverter switches is discussed in detail. The working of developed inverter using the controller and driver circuit is demonstrated with the help of hardware results. The speed of the induction motor can be varied using either the mobile phone or the computing system through the Internet of Things. Hence, this system could be used in the applications where the manual entry is restricted and the length of communication cables is a constraint.
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