The motor technology of new energy vehicles has achieved significant innovation and development in recent years, and the following are some key new technologies:
1. Flat copper wire technology (Hair pin winding):
Flat copper wire technology replaces traditional round copper wire with flat shaped copper wire, increasing the contact area between the coil and the iron core, thereby improving the thermal efficiency and power density of the motor. This structure also reduces the end length of the winding, lowers copper loss, and improves the efficiency and performance of the motor.
2. Multiphase permanent magnet motor technology:
Multiphase permanent magnet motor technology reduces torque fluctuations and improves fault tolerance by increasing the number of phases in the motor, such as five or seven phases. This design makes the motor run more smoothly at high speeds, with lower noise and vibration, making it suitable for new energy vehicles that require high comfort.
3. Permanent magnet synchronous reluctance motor technology:
Combining the high efficiency of permanent magnet motors with the high power density of synchronous reluctance motors, this motor technology provides better performance and efficiency. They typically have high power factor and low torque fluctuations, making them suitable for high-performance electric vehicles.
4. Permanent magnet heat dissipation technology:
Due to the potential demagnetization of permanent magnets at high temperatures, which can affect motor performance, new heat dissipation technologies such as built-in cooling channels and direct oil cooling have been developed to maintain permanent magnets at optimal operating temperatures, ensuring motor stability and longevity.
5.800V high-frequency high-speed EV motor technology:
With the introduction of the 800V high-voltage platform, motors need to adapt to higher operating voltages and higher switching frequencies. This requires motor design to withstand higher voltage stress while reducing electromagnetic interference, improving motor efficiency and reliability.
6. Key technologies for high-performance EV motors:
These technologies include optimized magnetic pole structure design, such as IPM-d axis asymmetric magnetic pole structure, as well as bypass flux design, aimed at improving the synthesized torque of the motor and reducing torque fluctuations. The internal oil cooling technology improves the cooling efficiency of the motor, especially under high load conditions.
7. Application of new materials:
The application of new materials such as neodymium iron boron (NdFeB) permanent magnets enables motors to achieve higher power output with smaller volume and weight. These high-performance permanent magnet materials have excellent magnetic properties, which help improve the efficiency and power density of motors.
8. Development of electronic control technology:
The technological advancement of motor controllers, especially the application of wide bandgap semiconductor materials such as silicon carbide (SiC) and gallium nitride (GaN), has improved the efficiency and power density of motor controllers.
These new material devices can operate at higher temperatures and voltages, reducing energy loss and improving the performance of the entire vehicle. The innovation and development of these technologies not only promote the performance improvement of new energy vehicle motors, but also provide more possibilities for the future development of new energy vehicles.
