Double electric mechanism type introduction
In the article "Two Motors to Drive the Family Quest", a system called "Double-Motor Coupling Drive" is introduced, which is just a member of the family.
The single-wheel independent drive system emphasizes that each wheel is independently driven, and the torque and speed of each wheel are independently controlled, so that the car has unparalleled flexibility and control, but at the same time it needs to achieve "electronic difference" Control algorithms such as "speed" and "torque distribution" are also challenging for control accuracy and complexity. From the perspective of the motor, the power of the left and right wheels should be balanced, and the two motors must be designed to be consistent. Therefore, the two motors cannot be differentiated and complemented, and the contradiction between the "low speed and high speed balance" faced by the motor design has not been alleviated. Therefore, this solution is a pure system-level solution.
The configuration of the coupled drive mode is as shown in the figure below. The two motors share one output and can be equivalent to one motor, so it is also called coupled drive. The advantage of this configuration is that it can effectively solve the contradiction of single motor design, divide a motor into two motors, and realize the optimization of equivalent motor performance through differential complementation, which is a component level solution.
Tesla chose the front and rear axle independent drive type. The utility model has the advantages that the vehicle's gravity can be fully utilized to generate the vehicle adhesion, and the overall power is improved, and the complementary design of the two motors is differentiated, that is, the system can be efficiently obtained, and the design difficulty of each motor can be reduced, which is system level + A component-level integrated solution. This choice is not just a skill but a wisdom.
Of course, Tesla chooses the front and rear axis independent drive technology, and there may be other considerations, such as performance and technical maturity, performance and economic balance.
