The core technology that distinguishes new energy vehicles from traditional vehicles is the "three electrics": the electric motor, the power battery, and the electronic control system. These three components are collectively known as the three-electric system. The three-electric system is the core component of new energy vehicles.
New energy vehicles typically use electric motors as their driving force. Electric motors can be divided into two types: DC motors and AC motors. Different types of motors have different characteristics.
DC motors: DC motors typically employ a brush and brush ring structure, achieving direction change through the reversal of brush current. DC motors offer advantages such as simplicity, ease of control, and high starting torque, but suffer from low energy efficiency and high maintenance costs. Despite these drawbacks, DC motors remain widely used in certain specific applications.
AC motors: AC motors are powered by AC power. Based on the different structures of the stator and rotor, they can be divided into two types: asynchronous AC motors and permanent magnet synchronous motors.
Asynchronous AC motors: Asynchronous AC motors are the most commonly used type of drive motor. They generate torque using the principle of a rotating magnetic field, requiring no external excitation, and are simple in structure and highly reliable. However, relatively speaking, their control complexity is higher and their efficiency is slightly lower.
Permanent magnet synchronous motors (PMSMs): PMSMs use permanent magnets as rotors and offer advantages such as high efficiency, high output torque density, and small size. Because the magnetic field of the permanent magnet provides the excitation force, PMSMs perform exceptionally well in high-speed and high-efficiency applications. However, the use of permanent magnet materials derived from rare geomagnetic elements also presents challenges in supply chain and environmental sustainability.
In addition, new energy vehicles are equipped with electric motor controllers to control the operating status, speed, and direction of the electric motor. These controllers typically employ advanced electronic technologies, including power electronics, sensors, and control algorithms, to achieve precise control of the electric motor and optimize energy utilization.
It is important to note that in new energy vehicles, the matching and optimization between the drive motor and the motor controller are crucial to achieving efficient power output and optimal energy-saving performance. Therefore, different automakers and models will choose different types and specifications of drive motors and control systems to meet their specific performance and requirements.
