The Design of Motor Drive with Speed Control for an Electric Bicycle

This paper presents a simple method to design the speed control system of motor drive for an electric bicycle. By properly selecting the current controller time delay and speed controller time delay, the crossover frequency of current controller and the 3-dB corner frequency of PI controller can be found, respectively. The rotor frequency is designed in the range between these two frequencies for proper operation. The simple method to determine the range of operating speed with appropriately tuning controller parameters, can not only speed up the design and implementation of speed controlled motor drive but also reduce the development time. An electric bicycle based on a blushless dc motor drive which has high efficiency, zero pollution, clean and convenient, is then designed and implemented in this paper. The hardware design based on a microcontroller is analyzed and discussed. The software programming is developed in MPLAB integrated development environment. Finally, a prototype of blushless dc motor drive for an electric bicycle is realized and demonstrated. The experimental results show the feasibility and fidelity of the complete designed system.