Regenerative Braking Control Technology Of Permanent Magnet Brushless DC Motor

Under the dual-pressure of environmental protection and energy crisis, theresearch and development of zero-emission and low-energy consume electric vehicle(EV) have been drawn attention to many countries, as a result the technology of EVhas made a breakthrough in recent years. However, the battery technology cannot berevolutionary improved in a short time, so how to extend the miles of EV which oncerecharged is the primary task now. Under such circumstance, using motor controltechnology has become a key factor to improve the EV performance. In order to makethe best use of the limited energy of EV, a deep regenerative braking controltechnology analysis of permanent magnet brushless DC motor is presented in thispaper.Firstly, this paper introduced the development status of EV and its specialappropriative motor, and the research significance of regenerative braking technology.Then, the basic structure and work principle of permanent magnet brushless DC motorwas described and the mathematical model was established with MATLAB/Simulink.Based on the mathematical model, the simulation model of permanent magnetbrushless DC motor governor system was constructed. A simulation analysis wastherefore conducted and the results showed that the system performed well in speedcontrol.Secondly, the basic structure of regenerative braking system was introduced anda comparison between two different regenerative braking processes under half-bridgemodulation and full-bridge modulation was conducted. On this basis, this paperfurther analyzed the relationship between the parameters, such as the regenerativebraking current, duty cycle, and the counter electromotive force within a PWM period.Finally, the constant torque control strategy was selected after comparing andanalyzing the advantage and disadvantage of different regenerative braking controlstrategies.In order to obtain constant torque control, a fuzzy controller was designed basedon the fuzzy control theory. Moreover, a numerical simulation model of permanentmagnet brushless DC motor regenerative braking control system was established. Thesimulation results indicated that a better effect of braking and energy regeneratingwas achieved by adopting the control strategy and the fuzzy controller proposed inthis paper. Finally, a test-bed was designed for the purpose of verification of the controlalgorithm. This paper gave the detail of the main component’s function and thechoosing principle of the test-bed. After the designing, modeling and processing ofthe mechanical components, the mechanical part of the test-bed was installed on thestand. It has therefore created a good foundation for further research.