Motor material technology
Further on the motor material technology, what is the discovery in the material technology? First of all, the same silicon steel material, different punching process shows different characteristics, especially the difference in iron consumption is very large. Secondly, the mechanical properties of silicon steel are what we usually talk about, and they change with temperature. Usually, there is no special attention when doing strength check. However, recent studies have shown that the yield strength of silicon steel sheets is reduced by about 30% at high temperatures and normal temperatures.
In terms of motor controllers, it is mainly integration, especially system-level integration, which integrates the internal structure of semiconductor wafers and controllers. This is also the place where our current and foreign gaps are relatively large, and it is also the focus of catching up. There is also an application from silicon carbide, which has increased investment in China, and it is likely to be basically synchronized with foreign countries in the application of silicon carbide. In addition, it is the motor control technology. What is the concern of the control technology now? The first voltage utilization is improved, the same is the ability to control the motor output under the battery voltage; the second is the torque compensation, which involves the whole vehicle comfort type. , that is, NHV performance; there is fault diagnosis, how to ensure the safety of the vehicle.
For motor control software, especially for passenger car applications, the requirements for ISO26262 functional safety and AutoSAR software architecture are becoming more and more prominent. In addition, the electromagnetic compatibility performance, electromagnetic compatibility is the project that has been mandated in the past two years, whether it is a passenger car or a car. How to improve the electromagnetic compatibility of components is also a matter of great concern. There is also system matching. The design of the motor is not only to say that the motor itself has to design a wide efficiency zone, but further that the high-efficiency zone of the motor is a common area of the whole vehicle, so it is necessary to optimize the system globally, which is also from our research perspective. A very important direction.
In terms of the assembly of the electric drive system, different power system configurations include commercial vehicle motor gearbox assemblies, dual motor assemblies, etc. The current passenger car powertrain system is also exploring whether it can be used in passenger cars. There is also a hub motor, the hub motor. My personal opinion is a very good form of distributed drive, but it takes a lot of time to make the hub motor into a product.
The last section talks about the development direction of drive motor technology:
First, integration, including electromechanical coupling integration, power electronic controller integration;
Second, high efficiency, no matter what technical approach, we always pursue high efficiency and low cost;
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