Background:
For the cooling system of the traditional new-type engine and new-energy vehicle, the water
pump is the core of them. If the design of the water pump is not reasonable, the engine will be overcooled or overheated,
which will affect the efficiency of the engine. Therefore, it is significant to propose a design method of electronic water
pump for automobiles based on active regulation.
Objective:
In this study, an electric water pump was designed according to the condition in n = 4200r/min, Q = 90L/min,
and H ≧ 4.4m. The flow, head, and efficiency and power of this electric water pump will be discussed. And a brushless
direct current motor for this pump was designed and analyzed.
Methods:
The flow details of the pump, such as pressure distribution, velocity distribution, and turbulent kinetic energy
distribution were obtained by Pumplinx. The head, efficiency, and power of the pump were established by the analysis of
the flow field of the pump. Then, based on the working conditions of the pump mentioned above, a brushless direct
current motor for the pump was designed by Maxwell and its performance was also analyzed.
Results:
The experimental results showed that the maximum efficiency of the motor reached 72%, the maximum
efficiency point of the motor was near the rated speed, and the efficiency of the motor at rated power was 66.31%.
Conclusion:
The results showed that the complex condition of running water inside the pump can be exactly stimulated
by the Computational Fluid Dynamics technique, especially about the pump head and its efficiency, which provided the
theoretical foundation for the later application research and development of automotive electronic water pump.
