Method and device for selecting motor system

Abstract

The invention provides a method and device for selecting a motor system. The method comprises the following steps of: acquiring a first corresponding relation between various types of power and the rotating speed according to the running condition of an electric automobile; acquiring a second corresponding relation between various torques and the rotating speed according to the running condition of the electric automobile; detecting a first high-efficiency area from the first corresponding relation; detecting a second high-efficiency area from the second corresponding relation; and comprehensively considering selection of the motor system according to the first high-efficiency area and the second high-efficiency area. In the invention, a motor system with a higher matching degree can be selected, so that the motor system can be used for supplying power more effectively in the running process of the entire automobile under different working conditions, more energy is saved, and the driving range of the entire automobile is increased; and under the extreme working condition, motor heating is reduced, so that the service life of a motor battery is prolonged.

Description

technical field [0001] The invention relates to electric vehicle technology, in particular to a method and a device for selecting a motor system. Background technique [0002] The motor system is the power source of electric vehicles, therefore, the selection of a suitable motor system is very important for electric vehicles. At present, when selecting the motor system of an electric vehicle, the calculation is only based on the basic parameters of the electric vehicle, and the electric vehicle is selected according to the calculation results. The specific methods include: (1) Calculate the motor system according to the maximum speed of the electric vehicle. The rated power required by the system; (2) Calculate the rated speed required by the motor system according to the common speed of the electric vehicle; (3) Calculate the climbing torque required by the motor system according to the minimum speed of the electric vehicle. According to the above calculation method, the r...

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Problems solved by technology

[0003] According to the above description, it can be seen that when selecting the motor system, the matching motor system is only selected based on the basic parameters of the electric vehicle. However, different working conditions will have a greater impact on the motor system. For example, during the driving of an electric vehicle, due to different driving conditions, the motor speed and torque are also in a state of constant change. The working condition factors affect the efficiency of the motor system. However, the existing methods for selecting the motor system are only based on the static parameters of the electric vehicle, but do not consider the working conditions of the electric vehicle. Therefore, the selected motor system will inevitably lead to low efficiency. , unable to provide effective power, thereby reducing the driving range of electric vehicles

[0004] Moreover, the currently existing methods for selecting the motor system only calculate a specific value of each parameter used for selection based on the static electric vehicle parameters, and then select the motor system based only on a specific value of the parameter , but in practice, there may not be a corresponding parameter value of the motor system to be selected that completely matches the calculated value, and even if a value matches, it cannot guarantee the highest efficiency of the selected motor system, so that the selected motor system cannot provide Efficient power, which in turn reduces the driving range of electric vehicles

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