| Summary: | 碩士 === 國立彰化師範大學 === 電機工程學系 === 102 === In recent years, the development of the electric motorcycle is growing rapidly. The four 12V series-connected batteries are usually used as the power source in common electric motorcycles. However, due to the differences in each battery, batteries may be overcharged or overdischarged. The charging efficiency would then be reduced as well as the endurance of the electric motorcycle. Moreover, the motor speed would be reduced by the battery voltage drops because the series-connected batteries are directly connected to the drivers in common electric motorcycles. Therefore, enhancing the battery life and the motorcycle endurance are the most important issues.
A Ćuk-type brushless DC motor driver with batteries balancing charging is proposed in this thesis. The driver is composed of a Ćuk-type inverter and a bypass circuit for four series-connected batteries. While the battery voltage drops, the Ćuk-type inverter can still deliver stable power to the motor for remaining the speed. Meanwhile, the voltage of each battery is monitoring to avoid overcharging. The proposed driver circuit can also be used as the grid connected balancing charger for the series-connected batteries. Finally, a 600W prototype circuit is constructed to driving a brushless DC motor with rated speed 3000rpm. The proposed driver is also connected to the grid for balancing charging the series-connected batteries. Corresponding experimental results are given to verify the validity and the performance of the proposed driver.
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