“This paper analyzes the loss composition of the inverter, compares the performance of the fourth generation IGBT and the seventh generation IGBT through thermal simulation, and finally verifies the conclusion through experiments. Under the same working conditions, the loss and junction temperature of IGBT7 are significantly lower than those of IGBT4, so that the volume of the inverter can b...
For electric vehicles, one of the core components is the motor. The power supply provides electrical energy for the motor, and the function of the motor is to convert the electrical energy into mechanical energy, and then drive the wheels forward through the transmission device. Therefore, the energy conversion efficiency of the car is inseparable from the performance of the motor. In order to improve the performance of the car, the dual-motor mode has also been applied to electric vehicles. So compared to the traditional single motor mode, what advantages does the dual motor mode have? Is it just a superposition of a single motor?
First of all, the current dual-motor drive mainly has three ways. The first is to superimpose two motors with the same power to achieve a multiple increase in torque and power. The second is that two motors work in partitions, one responsible for the front wheel drive and the other One is responsible for rear-wheel drive. The third is to use two single motors with different powers, one is responsible for controlling the operation of the car at high speed, and the other is responsible for controlling the operation of the low-speed area, thereby improving work efficiency. Among these three methods, the third one is the most common.
Secondly, different from the simple single motor drive, the dual motor can effectively improve the performance and endurance of the car, and the user experience is also better. When designing a single-motor system, considering that the car needs to cope with climbing and some complex road conditions, the selected motor power is often too large. In the actual application process, in many cases, the motor is at a low speed operating point, so the efficiency of the motor is relatively low, and most of the energy is wasted. And dual motors do not have to worry about such problems. Using motors with different powers at low speed and high speed can greatly improve energy utilization efficiency. Compared with single motors, it is more energy-saving and environmentally friendly, and the battery life of the car will also be improved a lot.
Finally, although dual motors have greater advantages than single motors in terms of energy conversion efficiency, due to the complex operation process of dual motors and the need to coordinate the balance and control between the two motors, the technical requirements are also relatively high. The cost of building a car will also increase significantly. Therefore, most of the current mainstream pure electric vehicles use a single motor.
To sum up, with the continuous progress of new energy vehicles, various technical difficulties are gradually breaking through. Dual motors have greater advantages than single motors. Although the technical threshold is relatively high, under the current situation, the development prospects are also very promising.