Hardware Design Considerations for an Electric （硬件设计考虑电动）.pdf

Application Report SLVA642– June 2014 Hardware Design Considerations for an Electric Bicycle Using a BLDC Motor Srivatsa Raghunath ABSTRACT A traditional bicycle is a two-wheel vehicle that is propelled by the rider who delivers muscle power through pedals that rotate one of the two wheels. The rider steers the front wheel to create a force that returns and maintains the vehicle center of gravity into a stable zone whenever necessary, thus keeping the bicycle upright. An electric bicycle carries batteries that deliver electric power to a motor that is coupled to either wheel. In most electric bicycles the rider can chose to use muscle power to deliver all, part, or none of the propulsion power required to maintain an adopted travel speed. Some models even sense pedal pressure and command the motor to deliver more power whenever the rider pedals harder. Contents 1 Introduction 3 2 Motor Selection 4 3 Stator 4 4 Rotor 4 4.1 Battery Selection 9 4.2 Controller Selection 11 5 Key Electrical Characteristics of E-Bike Controller 11 5.1 Sensing Mechanisms 12 6 Hardware B