| Summary: | 碩士 === 大葉大學 === 機械與自動化工程學系 === 103 === In recent years, the brushless DC motor has become much improved, giving higher efficiency and more power output. As a result, a cooling system that functions well becomes increasingly important. The air-cooled system for the last generation electric motors is no longer good enough for high-power electric motors and it has been gradually replaced by the liquid-cooled system. How a piezoelectric pump is formed through the use of the piezoelectric properties of the materials and how it is integrated into the liquid-cooling system of a DC brushless motor will be discussed in this article. This article proposes the technique of directly cooling the steel casing to more effectively dissipate the heat that is being generated a working electrical motor. How temperature would affect the output efficiency of an electrical motor is also examined.
The current work involves integrating a valve piezoelectric pump with a 650-watt brushless DC electric motor. The capability of piezoelectric pump can reach 500.
After analyzing the electric motors, the distribution of its magnetic field lines is known. Ten holes, each of which measures 4.2 mm in diameter, are drilled on the steel casing and filled with a thermal paste. Then the coppers are located into the holes with thermal paste and connect the valve pump. After putting a cooling material or fluid into copper conduit a piezoelectric pump driven by a water-cooled liquid will make the entire cooling system operate well. In that way, the temperature will be lowered to 20°C when the motor is not working. And the motor can work for 105 minutes when it is working.
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