Research And Practice Of Electric Bicycle With Switched Reluctance Drive System

Environmental protection and energy conservation are two extrude topics of the 21st century. Accordingly, different kinds of green vehicles rise in response to proper time. Electric bicycle is a perfect green vehicle, which has characteristics of non-pollution, low noise, simplicity of operation and moderate velocity. It grows rapidly in company with the enhancement of battery performance. Correlative products are exploited at home and abroad. Electric bicycle has extraordinary market prospect.As a new type of speed control system, switched reluctance drive (SRD) is characterized by its compactness, robustness, flexible control method and it seems to be one of the excellent solutions for the electric vehicles. The thesis focuses on designing a low-price electric bicycle with pedal assistance using switched reluctance drive. A 6/8 pole low speed switched reluctance wheel motor is adopted in terms of its' applicative feature. The whole control system is finished with AVR chip microprocessor ATmega8 and GAL20V8.Firstly, based on overview of the development of electric bicycle and switched reluctance drive system at home and abroad, it is concluded that it is a good try to apply switched reluctance drive system to electric bicycle. Since high performance-price ratio and reliability are required for electric bicycle, so the scheme of switched reluctance drive system is put forward by considering the type of motor, control strategy, power converter and control kernel synthetically.Secondly, compound control strategy of PWM and APC (Angle Position Control) are studied. With prototype's non-linear model, steady state simulation is carried out in MATLAB/SIMULINK environment. The simulation result supplies correlative control parameters and control law for angle optimization control of switched reluctance motor.Eventually, hardware and software design of the control system are finished with AVR chip microprocessor ATmega8 and GAL20V8.Reliablity design of system are also discussed. The experiment is carried out and the results show that the system has good performance. Electric bicycle using this drive system has high performance-price ratio and prodigious potential application.