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High Efficiency, High Power Density And High Reliability
Jun 12, 2018

The drive system is one of the most important systems for electric vehicles. The performance of electric vehicles is mainly determined by their drive system. The electric vehicle drive system consists of a traction motor, a motor controller, a mechanical transmission, wheels, and the like. Its source of energy storage is a battery pack. The motor controller receives the output signals from the accelerator pedal (equivalent to the throttle of the fuel car), the brake pedal, and the PDRN (parking, forward, reverse, neutral) control handle to control the rotation of the traction motor through the reducer, transmission shaft, and differential Mechanical transmissions such as speeders, axles, etc. (When electric vehicles use electric wheels, the mechanical transmissions are different) to drive the wheels. When the vehicle is decelerating, the motor acts as a brake on the forward movement of the vehicle. At this time, the motor is in a running state of the generator and charges the energy storage source, which is called regenerative braking. The regenerative braking function of the power drive system is very important. It can increase the mileage of the electric vehicle after a single charge by 15 to 25%.

The motor is the driving unit of the electric vehicle. Its technical performance directly affects the dynamics and economy of the vehicle operation. Therefore, it is necessary to carry out finite element analysis of the electromagnetic field, temperature field and stress field of the motor through computer-aided design. The design is in accordance with the electric vehicle. The motor required for operation has the characteristics of wide speed range, large starting torque, high backup power, high efficiency, high power density and high reliability. For induction motors, it is required to increase the rated operating point (base frequency above 100Hz) and operating current density, and to reduce copper consumption (high conductivity material) and iron loss (high permeability). Moreover, the motor uses liquid cooling to increase heat capacity, reducing volume and mass. The perfect combination of motor technology and power electronics technology, microelectronics technology and control technology, and finally developed into a reliable, easy to maintain, high power density, high integration of intelligent motor.