Braking device for electric wheelchair. The scientific name of electromagnetic brake is eddy current retarder. When we are in some way (push hand switch, brake or brake pedal) when the stator coil retarder with a direct current, generates a magnetic field in the stator coil, the magnetic field forms a loop between adjacent core and yoke plate, air gap and rotor. At this time, if the relative motion between the rotor and the stator, the motion of the conductor is equivalent to cutting magnetic lines, according to the principle of electromagnetic induction, the internal conductor generates induction current and induced current will produce another magnetic field, there will be a force between the magnetic field and the magnetic field already exists, and the direction of the force is always hinder the movement direction of conductor. This force is the source of retarder braking torque.
The electrical control system of eddy current retarder installed on the electric scooter by microcomputer control, when the speed reaches a certain speed, the microcomputer control system into the standby state, push hand switch or gear retarder, brake pedal, microcomputer control system will be based on the number of stalls or hand to open the pressure switch on respectively, in different series, gradually increase the strength of the vehicle eddy current retarder, braking force is different.