The second is the national “13th Five-Year Plan” key research and development plan. A number of projects have been launched last year. The second batch of projects is being launched this year. There are six projects involving drive motors and power electronics, corresponding to drive motors, power electronics, and electric drives. Cheng et al; also motor controllers, including the basic theory of silicon carbide devices and silicon carbide motor controllers. The development goal of the 13th Five-Year Drive Motor is to continue to achieve, and the motor controller is to achieve power multiplication. If we can achieve power multiplication, we can achieve foreign synchronization. Of course, foreign countries are also developing, but from the past two years, our development speed will accelerate. For the power density of the motor controller, the level to be reached from 2014 and 2020 is given here, as well as the level that can be achieved in 2025. Of course, 32-36 kW/L in 2025 is based on silicon carbide devices. For silicon-based materials, due to the intrinsic temperature limitation, it is analyzed that the maximum power density limit that can be achieved is 19-20 kW/L. That is to say, if it is to reach 32kW/L, its frequency range and operating temperature must be increased, and silicon carbide may be a very good carrier.
For the drive motor, the 13th Five-Year Key R&D Program also has clear objectives. The passenger car motor power density is 4kW/kg, and the commercial vehicle motor torque density is 20Nm/kg. What is the current torque density level and is related to the motor structure. Such as plug-in passenger car motor, may be 16-17Nm / kg, if the direct drive motor torque density will be slightly higher, that is to reach 20Nm / kg through the increase in material utilization, it is very likely to be achieved. To achieve this indicator requires a lot of technical ways to achieve, also introduced later.
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