Motor permanent magnetization, electronic control tends to high integration
China's new energy vehicles are mainly divided into two major technical routes, one is pure electric vehicles, and the other is plug-in hybrid (including extended-program) cars. In order to promote the localization of key components of new energy vehicles, the country has long been In 2010, it has clearly defined the strategic transformation direction of pure electric vehicles (in addition, there is also a special type of low-speed electric vehicles with certain market applications). From the actual use of pure electric vehicles, batteries and motors are the two focuses of the market. They are directly related to the two important indicators of the cruising range and dynamic performance of new energy vehicles, and the realization of the next phase of new energy vehicles. A breakthrough in technology upgrades.
In the motor part, unlike some mainstream foreign manufacturers, the key development direction of China's new energy vehicles is permanent magnet synchronous motor. On the one hand, China's high-speed magnetic materials industry provides a rich raw material foundation for the development of permanent magnet synchronous motors; on the other hand, compared with AC asynchronous motors, the biggest advantage of permanent magnet synchronous motors is their high power density and torque. Density can participate in the design of the whole vehicle with a small volume and light weight, providing the largest possible power output and acceleration for the new energy vehicle. It is understood that the permanent magnet synchronous motor is currently available in the new energy passenger vehicle market. A wide range of applications, such as the Roewe E50 and the Kia K5 hybrid, have adopted this type of motor.
In order to comply with the new energy vehicle design and motor development ideas, the vehicle motor controller technology is also moving towards improving the power density of the motor and power devices and improving the integration of the vehicle. In the power device segment, semiconductor manufacturers represented by Infineon are striving to break through the limits of device power density by increasing the operating temperature of the device, achieving functional integration, and intelligent control. Based on these high-quality power devices, and by optimizing the vehicle motor control core algorithm, the overall motor-electric control system can achieve the best matching, thus achieving the maximum power density of the drive motor; at the same time, the field weakening control technology for the vehicle The wide speed range of permanent magnet synchronous motors also plays a crucial role. These are among the focus of many manufacturers. Another major trend is that in the electronic control system for new energy vehicles, all-in-one integrated products are increasingly favored. Users require main drive control, auxiliary drive control, DC/DC, high-voltage power distribution, air pump, and oil pump. The control is integrated in the same volume, which makes the controller smaller in installation volume and lighter in weight, meets the requirements of automotive electronics for high compactness of components, and greatly improves the safety, reliability and integration of the vehicle.