Electric Vehicle Electric Drive System Industry Technology Innovation Strategic Alliance
Fourth, it is about the strategic alliance of electric vehicle electric drive system industry technology innovation. Just the moderator said that I am the secretary general of the industry alliance. I will also introduce this alliance later. One of its purposes is to promote the coordinated development of upstream and downstream drive motors and motor controllers in China, mainly to improve the localization of our key materials and key components.
First, let's make a comparison. Let's take a look at the main differences between passenger car motors and car motors. Of course, we have a lot of car motors used in passenger cars, but bus motors are used in cars. What is the difference?
First look at the speed, the speed is mainly related to the traditional powertrain, the maximum speed of the passenger car engine as the power source does not exceed 3000 rpm, so the passenger car drive motor includes plug-in type, pure electric, generally in the 3000~3500rpm; there may be a small Some of the logistics vehicles or official vehicles motor speeds to 4000 rpm, basically in this range. There are two motors in the illustration. These two motors are equally powerful, but the size and weight are completely different. For car motors, because of the difference in power transmission mode, either acceleration or deceleration, or variable speed, can reduce the torque demand of the motor twice, the corresponding volume and weight will be reduced, of course, the speed will increase.
The second one for the motor, generally speaking, how many kilowatts this motor, but in fact the size and weight of the motor depends on the torque, the torque and volume of the motor is proportional. Because the passenger car motor has low speed and large torque, the weight is relatively high and the corresponding cost is relatively high.
Third, because the power demand of passenger car motor is relatively large, the voltage requirements are generally high. Especially for direct drive motors, the DC voltage of 500~600V is more common. Of course, there are also plug-in bus motor voltages of 300~400V. This level. The DC voltage of a car motor is generally between 300 and 400V.
Fourth, in recent years, we can find that in the application of passenger cars, the controllers of different applications gradually integrate, and the requirements of such integration are more and more; but the car motor controller is customized due to the space problem. More. In addition, from the motor controller for the car, we can actually find the space problem inside, so its standardized controller is generally less, unless it is very small, what kind of car can be used, If you can't do this, you need to do customization, and there is integration. Integration will be introduced later. Its integration means not only the system of different power electronics controllers but also the inside of the controller. Structural integration.
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