The Electric Drive technology is not a new technology but it has been gaining interest due to its capability of contributing in the reduction of green house gas in the environment. Moreover, it has a promising future in Nepal which can be justified by the presence of SAFA tempos. The project deals with the main aspect of the Electric Vehicle (EV) that is controlling the speed accurately and efficiently.
The project focuses itself in designing the high current driver circuit and an efficient algorithmic based control (Fuzzy Logic) to track the velocity. The design problem of the project is appropriate for a motor of 0.75 KW. The necessary parameter of the motor was calculated and used for designing the system. The motor driver circuit has been constructed using the MOSFET and employing the H- bridge circuit due to its simplicity.
The MOSFET implemented was chosen considering the maximum current it can draw. The control system uses the concept of FUZZY SET to control the error signal fed back to the system, which is obtained by employing optical encoder as a speed sensor. Unlike the traditional analog PID control system, where OPAMPs are used, the project utilizes the concept of the discrete control system by employing the controlling algorithm in the FPGA. The VHDL has been used to describe the digital system.
In summary, this project hopes to demonstrate the capability of Fuzzy Logic in designing a control system for speed controller of DC Motor. It also signifies the importance of the need for further research in the field of DC motor speed controller design in Nepal.