Wheel motor advantages:
The hub motor approach has significant advantages over the wheel motor approach.
(1) The transmission device of the transmission can be completely omitted, and the overall power utilization efficiency is greatly improved;
(2) The hub motor makes the overall arrangement of the whole vehicle adopt a flat chassis structure type, and the space and arrangement freedom of the vehicle are greatly improved;
(3) There are almost no high-powered moving parts on the body, and the vibration and noise comfort of the whole vehicle is greatly improved;
(4) The wheel hub motor method is convenient for realizing the four-wheel drive type, which is beneficial to greatly improve the dynamic performance of the vehicle;
(5) As the actuator, the hub motor can realize the integrated control of the vehicle dynamics including the line control drive, the line control and the dynamic control of the line control, and improve the initiative of the whole vehicle. safety.
Key technical issues in research on hub motor system
Hub motors bring new technical challenges, including:
(1) The hub motor system integrates various functions such as driving, braking and load bearing, and the design is difficult to optimize; (2) the internal space of the wheel is limited, the motor power density performance is high, and the design is difficult;
(3) The integration of the motor and the wheel results in a large unsprung mass, which deteriorates the vibration isolation performance of the suspension and affects the handling and safety of the vehicle under uneven road conditions. At the same time, the hub motor will bear a large impact load on the road, and the vibration resistance of the motor is demanding;
(4) Under heavy load and low speed climbing of the vehicle, the problem of overheating and burning of the hub motor caused by insufficient cooling is prone to occur. The heat dissipation and forced cooling of the motor need to be taken seriously;
(5) The water and dirt in the wheel parts are easily collected, resulting in corrosion damage of the motor and the reliability of life is affected;
to sum up
Drive technology development process
Compared with the centralized power drive of the motor, the hub motor technology has great advantages. It has a more flexible layout, does not require a complicated mechanical transmission system, and has its own significant disadvantages, such as the balance between the seal and the starting current/torque. As well as the differential speed of the drive wheels during steering, etc., if the problems can be solved in engineering, the hub motor drive technology will have broad prospects in the future of new energy vehicles.
