The rapid development of the new energy vehicle industry has led to the development of automotive heat dissipation technology. The heat sink is an essential part of the automobile cooling system, and its performance has also received extensive attention. Regarding how to choose a new energy vehicle cooling fan, more and more users no longer only pay attention to the price, cooling fan life, noise, speed, stability and other factors that must be considered.
According to its development process, the heat sink can be divided into three stages: mechanical radiator, direct engine drive or driven by pulley. Centrifugal fan is a mechanical fan with a clutch, an electromagnetic clutch and a silicone oil clutch. The electric fan controls the working state of the fan through the sensor and the relay. The three heat sinks reflect the development of automobile heat sinks in different periods and the different requirements of users for automobile performance. Different types of cars have different performance requirements for heat dissipation fans, and their acceptance of heat dissipation fan technology is also different. Through the application practice of the fan in the traditional fuel vehicle market, the car engine heat dissipation technology is at the forefront. After 2000, the car engine radiator began to popularize the heat dissipation of electric fans. At the same time, commercial vehicles and construction machinery are equipped with fans or clutch fans. However, the radiator fan of fuel passenger car does not stay in the stage of electric fan with brush.
Car cooling fans can be divided into brush electronic fans and brushless electronic fans. From the perspective of service life, the service life of brushless fans is much higher than that of brushed fans. However, in the past period of time, due to the high requirements of design requirements, production technology, technology research and development, brushless electric fans are expensive and have not been widely promoted. However, with the rapid development of new energy vehicles, the gradual maturity of brushless DC motor technology, and the improvement of production technology, brushless electronic fans have begun to "emerge".
New energy buses are the fastest growing and highest penetration segment of new energy vehicles. The particularity of urban public transport requires new energy buses to have the characteristics of high safety, high stability, and easy maintenance. These requirements are ultimately reflected in the vehicle manufacturing and parts selection. High-performance cooling fan is the first choice for heat dissipation of new energy bus power system. Through bidding for suppliers of several major bus companies, the author found that the products provided by the suppliers are required to be brushless electronic fans for heat dissipation in the bid section of the motor cooling system. Some vehicle manufacturers further require the import of brushless electronic fans, and at the same time need to meet the requirements of stepless speed change, low noise, IP67 protection level, etc.
The role of the heat dissipation wind is to dissipate the heat of the power system of the new energy vehicle, and the fan plays an important role in accelerating the thermal efficiency of the radiator. The performance of the heat sink directly affects the heat dissipation effect of the radiator of new energy vehicles. With the progress of science and technology, stable performance, standardized production process, the cost of brushless electronic fan is gradually reduced, brushless electronic fan will become the first choice of new energy vehicle radiator fan. Brushless fans will also become the mainstream configuration of new energy vehicles.