In the face of the opportunity of electric vehicles, there is a new trend to challenge the existing electric vehicle architecture to form a multi-motor multi-gear automatic transmission system. In the whole vehicle structure, the basic structure of the motor and the speed reduction equipment has a basic position. The electric vehicle multi-motor multi-gear automatic shifting system changes the structure of the motor and the reduction box, and it is necessary to transform the three control systems.
First of all, we must understand the principle and composition of the electric multi-motor multi-gear automatic transmission system. There is a mode in which: one A motor is connected to the sun gear, and the outer ring gear is activated to connect to another B motor. 1 When only the A motor rotates, the B motor brake does not move, and the inner and outer gear rings remain stationary. Under the sun gear, the satellite wheel rotates inside and outside the gear ring to transmit power to the output shaft. 2 If the B motor rotates, the A motor brake does not move, and the B motor shaft gear drives the inner and outer gear rings to rotate, which drives the satellite wheel to rotate around the stopped sun wheel to transmit power to the output shaft. The rotation of the 3AB motor simultaneously rotates the sun gear and the inner and outer gear wheels to rotate the satellite wheel to transmit power to the output shaft. In these three states, the state has a fixed gear ratio, so the process of selecting the motor is the shift position. Since all three states can operate, their mutual conversion process is unconstrained, and the conversion process is controlled by the electrical controller, so that the clutch can be smoothly shifted without a clutch. This structure is simple in size, light in weight, and strong in carrying capacity. Long service life, stable operation, low noise, large output torque, high efficiency, safe performance and low technical content. But the role and effect are very ideal, and its emergence will bring a revolutionary revolution to the structure of electric vehicles.
In the electric multi-motor multi-gear automatic transmission system, the shifting mechanism does not generate torque, but it can transmit torque or increase torque to reduce the speed, increase the speed to reduce the torque, generate the torque in the motor, and the motor torque of the same nature different. The torque of induction motors, brushless motors, and switched reluctance motors is also different. To be specific to the design, the torque can be mentioned. This paper only clarifies the relationship between speed ratio and power in the multi-motor multi-gear automatic shifting system of electric vehicles.
Of course, this is only the theoretical calculation result, and the wind resistance, the vehicle's curb quality, the various types of power of various models and the number of teeth of the planetary gears are different, and the effects are not the same, depending on the actual vehicle conditions. In the vehicle development stage, the lowest cost, the most effective way, the best configuration design ideas and the most effective measures are implemented in the multi-motor multi-motor multi-gear automatic transmission system, which finally forms a set of feasible Forward development of the design.
China's electric vehicles to achieve "curve overtaking" is the requirement of the times. The application technology of electric vehicles can not only follow the foreign technology, but also take the road of innovation and break through the bottleneck in the field of electric vehicle shifting, and establish a milestone of self-creation. To become the leader of the electric vehicle industry, to provide power for China's electric vehicle cornering overtaking, to take the road of Chinese-style pure electric vehicles, and to help China's electric vehicle business take off.
