Group: 2014-FYP-30



Dr. Tahir Izhar


The project presents the induction motor drives of an electric car. The foremost requirement for this technique is the design of three phase inverter. The inverter consists of Exb841 driver IC, IGBT module and STM32F407VG. Gate driver IC has dual functionality, used for isolation from STM32 if current exceeds its rating .. IGBT modules are used which are of high rating 600V and 100A as we need high voltage to drive three phase induction motor . IGBT is used for high power low frequency mechanisms. A MATLAB code is developed for 180-degree conduction, 120 degree conduction and also for sine PWM technique PWM technique is used to generate pulses and these pulses are applied at input of the gate driver IC. The gate pulses obtained are applied to IGBT module and output ac voltage is obtained. The three phase ac supply is used to run the three phase induction motor. V/f control method is used for drive control because of its versatility. In order to maintain flux constant if voltage is increased then frequency should be increased else there will be saturation and core losses. Open Loop V/f control is successfully implemented on a three-phase Induction Motor. Torque needs to be found constant for various rotor speeds. The closed loop V/f control of motor is implemented by PID of STM32f4 which gives a way of controlling the speed of motor, by keeping maximum torque constant . Moreover, in order to control navigation of motors of a car, a Bluetooth module HC05 is configured to STM through serial communication. Data is sent using mobile app to HC05 and STM will execute following commands according to the instruction sent from Android and then it will be able to control the direction i.e. left right motion of a car.

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