Implementation of a BLDC Driven Electric Bicycle

• Main Authors: Jhih-Sian Syu, 徐志賢
• Other Authors: Shinn-Ming Sue
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/60727457803869154354

碩士 === 明新科技大學 === 電機工程研究所 === 98 === The major purpose of this paper is to develop a brushless DC (BLDC) motor driven electric bicycle controller. It is aimed at achieving the electric bicycle drive control system, and to meet security benchmarks of the electric-assisted bicycles and electric bicycles. For the past days, most electric bicycles used brush DC motors. The major drawback is the use of carbon brush. Hence, the BLDC wheel motor is used in the paper with merits of no need to replace the carbon brush and extending the motor’s life time. The drive system of an electric bicycle includes the control circuits, the power battery, and the BLDC wheel motor. The digital signal processor (DSP) collects the hardware signals of the electric bicycle. Then, six pulse width modulation (PWM) signals are sent to the gate circuits for controlling the inverter. The safety devices of the drive control system include preventing starting burst, preventing burst, braking outage, and speed limit. A digital control core named TMS320LF2401A DSP and other hardware circuits including gate drive circuits, the full bridge inverter, the hall-effect current sensor, braking, and acceleration grip handle are formed to accomplish the control of the wheel motor. The wheel motor is a BLDC with 20 poles. Two control strategies including single side PWM scheme and single side complementary PWM scheme are tested in the study. Finally, all the hardware are assembled into a tested electric bicycle for road testing. The results of the road testing show that the developed motor drive can accommodate the security benchmarks of the electric-assisted bicycles and electric bicycles.