The motor controller connects the throttle, the battery, and the brakes with the motor. It's the brain of the electric bicycle system and ensures smooth riding.

Installation

For rear wheels, the controller is simply installed on the downtube (seat tube) of your bicycle either towards the rear or towards the front, depending on the space on the frame. For front wheel conversions, the controller can be installed on the front fork.

 

 

Technical Details

The motor controller produces a three-phase DC modulated signal to the stator coils of the motor.  This signal excites the electromagnets within the motor so that they attract and repel the permanent magnets in the rotor in such a way as to cause rotary motion.  This process is repeated and a hall-effect sensor is used to tell the controller what is the relative position of the rotor.  The same type of motor controller is used in hard-drives, PC cooling fans and hybrid cars.