A detailed introduction to the functions of hub motors

1. Carrying and driving
Bearing and driving is an essential function of hub motors. The way to realize the load is to rely on the axle bearing to realize the centering of the rotor and the stator. The wheel rim of the vehicle passes through the axle bearing instead of the stator and rotor to connect to the suspension axle housing to carry the road shock absorber and load. The way of driving is that the outer rotor is directly connected with the wheel rim to achieve the purpose of direct drive.
2. Electronic differential control
Electronic differential control is also one of the functions of the hub motor. The realization method is that the front wheel steering is completed by the ordinary steering machine; the required slip of the rear wheels is completed by the electronic differential; the turning radius is determined by the corner of the front wheel steering machine, and the rear wheel slip is determined by the turning radius of the vehicle and the wheelbase and wheelbase. The rear wheel slip is calculated from the angle of rotation of the front wheel steering gear. The steering gear can also be electronic steering. Even if the rear wheels cannot be strictly differential, the inner wheels should be changed from "active" to "driven" by disconnecting the motor or connecting compensation resistors in series in the loop.
3. Braking energy recovery
The function of the hub motor is also to recover braking energy. During the braking process of an electric vehicle, the kinetic energy of the whole vehicle is transmitted to the motor through the wheels, thereby driving the motor to rotate. At this time, the motor works in the power generation state, charges the energy storage device, that is, the battery or super capacitor, converts the braking energy into energy and stores it in the energy storage device, and realizes energy regeneration and utilization. At the same time, the resistance torque generated by the motor acts on the wheels to generate braking torque, which acts as a deceleration brake. Motor cooling There are two cooling methods for hub motors, air cooling and water cooling. Air-cooled, apply a structure that is conducive to gas circulation to cool the hub motor, such as a built-in cooling fan: water-cooled, set a special cooling liquid channel, and cool the hub motor by exchanging with the liquid.