The driving power source of electric vehicle is motor, and there is a difference between motor and engine, that is, in the state of constant power, the slower the rotation speed, the greater the torque; The higher the speed, the smaller the torque. Therefore, when the power supply of the electric vehicle to the driving motor is constant, that is, when constant power is input, the motor can automatically output the torque required for the electric vehicle to overcome the resistance, and can obtain the highest rotation speed under this resistance.
From the acceleration process, at every time point in the acceleration, the motor always automatically reduces the torque in exchange for the highest speed at that time point. In this way, the motor itself has the characteristics of gearbox, and there is no need to increase the gearbox, so that the wheels of the electric vehicle can flexibly and automatically output different torques according to the vehicle condition to overcome the forward resistance.
Just because you don't need a gearbox doesn't mean you don't need a gearbox; Without gearbox and clutch, electric vehicles can complete the basic functions of driving; But if the electric car is equipped with a transmission and clutch, it can be more powerful and icing on the cake.
At present, some international giants have already smelled this market opportunity. Internationally renowned parts suppliers such as Gikane, Schaeffler and Borgwarner have developed mass production AMT, and some plug-in hybrid models of BMW and Toyota are also equipped with multi-stage gearboxes. A number of rookie electronic control enterprises have emerged in China, and some enterprises transformed from traditional gearboxes are also planning their layout.
At present, new energy vehicles, pure electric vehicles and fuel cell series mostly use single-stage reducers, and the demand for energy consumption will increase in the future, or it will develop into multi-stage reducers; Parallel connection, the existing automatic gearbox is mostly used to transform or adopt electric drive axle; Series-parallel connection mostly adopts special hybrid gearbox. Generally speaking, new energy vehicles still need gearboxes. In recent years, new gearboxes appear constantly, such as two-speed gearboxes, coaxial gearboxes, gearboxes with integrated electronic disconnect differential, gearboxes with integrated double clutch differential, three-in-one assembly of gearbox with motor controller and gearboxes with integrated engine, motor and generator.
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(Photo/Text/Photo: Pacific Auto Network Q&A called Beast)