How does the electric power assist work?
The motor drive system of an electric bicycle is the key to differentiating from other bicycles and usually consists of three parts: the sensor, the controller and the motor.
Electric power assist work
When the rider pedals, the sensor is responsible for sensing the pedaling force and speed, and transmits the monitored speed, pedaling frequency, torque and other information to the controller, which calculates and issues commands to control the motor. It is worth noting that the majority of motors do not act directly on the drivetrain, the motor outputs power at a high speed and low torque and requires a reduction system to amplify the torque while keeping the output speed close to the pedaling frequency of the human leg (mid-motor) or the speed of the wheelset (hub motor).