||Study of Driving and Regenerative Braking of Brushless DC Motor for Electric Motorcycle
||Department of Engineering Science
In recent years, with the environmental consciousness enhanced, the development of electric vehicles is gradually taken seriously. However, the traveling range of the electric vehicles can not compete with the ability of the existing internal combustion engine vehicles, which is one of the most important factors of hindering the development of electric vehicle. Therefore, how to increase the traveling range of electric motorcycle is valuable to study. The common regenerative braking method is to add a bi-directional buck-boost converter to the controller of the electric motorcycle in order to convert the surplus energy into the electric energy and recharged to the battery when the electric motorcycle operated in the brake state. The method is effective, but increased the cost. In this thesis, the boost circuit of the regenerative braking method is proposed and combined with the electromotive force of the BLDC motor, the inductance which is the winding of the BLDC motor, the inverter and the battery. It is achieved by controlling the switching sequence and timing, which is derived from the relations of the three-phase voltages, of the inverter. The regenerative braking method which is proposed in this thesis could convert the kinetic energy into electric energy and produce a reverse torque to reduce the speed of the motor without adding any other components to the original controller.
However, the kinetic energy of moving electric motorcycle is not simulated simply in the laboratory testing. Thence, we designed a simple test platform, which connects the same two BLDC motors by a shaft coupling, in order to test and verify the regenerative braking method. The experimental results prove that the proposed method can be used to achieve the functions of deceleration and power regenerator.
Finally, the TMS320LF2407 Digital Signal Processor is utilized as the core controller, which integrates the regenerative braking method to design a driver for the applications of the electric motorcycle.
List of Tables VI
List of Figures VII
Chapter 1 Introduction 1
1.1 Electric vehicle development history 1
1.2 Research Background 2
1.3 Research Motivation 3
1.4 Literature Reviews 4
1.5 Outline 8
Chapter 2 Drive of the Electric Motorcycle 10
2.1 Basic Feature of Brushless DC Motor 10
2.2 Mathematical Model of BLDC Motor 12
2.3 Hall-Effect Sensor of BLDC Motor 15
2.4 Commutation Principle and Driving of BLDC Motor 16
Chapter 3 Regenerative Brake 21
3.1 Motive 21
3.2 Boost Conversion Operation Mode 22
Chapter 4 Experiments 36
4.1 Concepts of the Test Platform 36
4.2 Equipments of the Test Platform 39
4.2.1 Digital Signal Processor (DSP) 39
4.2.2 Complex Programmable Logic Devices (CPLD) 41
4.2.3 Inverter 44
4.2.4 Speed detection circuit 45
4.3 Experimental Results of the Test Platform 47
4.3.1 Power Generation Ability of the Regenerative Braking 48
4.3.2 Braking Ability of the Regenerative Braking 54
4.4 Equipments of the Electric Motorcycle Test 56
4.4.1 Electric Motorcycle 57
4.4.2 Driver of the Electric Motorcycle 58
4.5 Experimental Results of the Electric Motorcycle 61
Chapter 5 Conclusions and Suggestions 65
5.1 Conclusion 65
5.2 Suggestions 66
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