Car Motor Car Development Is More Difficult

- Oct 13, 2018-

The first is the research background. The expression of this table is relatively clear. First of all, industrial applications are usually in a small range, but the electrode drive requirements are in the global universities. In terms of operating conditions, one requires a very high speed range and requires fast dynamic response. In addition, the accuracy of the torque is relatively high, and the application conditions of the vehicle are different from those of industrial applications, including reliability and working environment. Of course, in terms of price, the price of a single set is far more stringent than that controlled by industrial applications. This brings the difficulty of developing our car motor, which means that if you are a general-purpose battery manufacturer, if you are developing a car motor, you still have to go through hard and relatively long time to transform.

At the moment, I would like to first tell you about the research work of our high-power density vehicles.

First, a simulation platform for multi-physics coupled power electronics.

Second, a module simulation model for IGBTs was established.

Third, after the module was established, we further established a policy model for vehicle motors for a variety of commercial software.

Using the above technology, we are looking for an optimal solution in terms of electricity, magnetism, machine and heat to achieve an integrated design and integrated design of the mouthpiece.

Another work, we have low-inductive power main loop technology.

How do we do this? Based on the simulation platform just mentioned, we first studied the switching characteristics, analyzed the complex changes, and improved the current output capability of the IGBT chip.

There is also a low-inductance loop design, which studies the integrated design method of multiple membrane electric single-core and busbar integrated components to reduce the stray inductance by more than 40%, thus establishing a peak voltage of 40% on the IGBT, so that the vehicle controller The volume is reduced by 10%.

We have another thing to deal with.

The IGBT chip of the vehicle has a heat flux density of 200W per square meter. The inlet temperature is high, and the flow and pressure difference provide weak ability. Under such circumstances, how can we do it? For this kind of vehicle civil system, there is a The system's continuous power is still less than the maximum power, which is one of our grips. Therefore, we study the power loss and thermal management of automotive inverters, and propose a high-efficiency water-cooled heat sink design to enhance the current sharing, so that the effect of soaking heat is improved, and the thermal resistance and flow resistance are further reduced.

Everyone knows that permanent magnets are a traditional technology, but there are some problems, such as the magnetic field of permanent magnets is difficult to adjust, so in the case of low speed, we need large torque, need a strong magnetic field, and in constant power At that time, the voltage is limited, so weak magnetic is required. In this case, because we are difficult to adjust the permanent magnetic field, the power factor is reduced. There is still a problem. When the high speed is out of control, as long as the permanent magnet exists, When there is speed, there must be a back EMF. When the speed is too high, it may be higher than the voltage of the battery, causing safety problems.

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