Power assembly of full electric vehicle electric drive system

Abstract

The invention provides a power assembly of a full electric vehicle electric drive system. The invention has a core that the power assembly is provided with an integral integration power assembly design consisting of one set of planetary gear train mechanism and two sets of drive motors; the motors and the transmission shaft of the power assembly adopt a coaxial design; two sets of motors are respectively connected with a planetary gear sun gear and a gear ring; two motors are in coordination control to realize stepless speed regulation; for an electric vehicle which requires high performance, an original single big motor is changed into two small motors for input, and the optimal matching of the revolving speed, the torque and the high efficiency area of the motors can be realized so as to realize the low cost and the high reliability of motor miniaturization, realize the high efficiency of the electric drive system and improve an endurance mileage to the maximum limit. Meanwhile, a speed change mechanism formed by a planetary mechanism has the advantages of compact structure and the like and is favorable for arrangement.

Description

technical field [0001] The invention relates to a power assembly of an electric drive system for a pure electric vehicle. Background technique [0002] With the depletion of global oil resources, electric vehicles will be greatly developed. Electric vehicles are not limited to micro electric vehicles. Electric vehicles are also developing in the direction of large vans or high-powered sports cars. Therefore, the power of the driving motor is required to be larger and larger, which leads to a larger single motor power, and it is more difficult to design the motor, such as high-speed and high-torque bearing life, too high power will require thick cables, and high-power power electronics are costly and reliable. Poor performance, difficult vehicle layout, etc. have a greater impact. [0003] In addition, for transmission electric vehicles, the constant speed ratio reducer scheme is usually adopted. The higher the vehicle dynamic performance index is, the greater the contradict...

AI Technical Summary

Problems solved by technology

If a fixed speed ratio is used, when climbing at a low speed, it is hoped to provide more torque for the wheels, usually by increasing the motor torque or increasing the speed ratio; but at high speeds, the whole vehicle pursues power characteristics, and the speed of the motor depends on the speed of the vehicle. Higher requirements for speed ratio, which requires the motor to have a very wide working area and greater overload capacity, and requires the motor to meet the characteristics of low speed, high torque, high speed and high power, which increases the difficulty of motor design and manufacturing. The cost also affects the design of the high-efficiency range of the motor, reducing the mileage of the vehicle

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