| Summary: | 碩士 === 逢甲大學 === 航太與系統工程所 === 96 === The object of this study is to design a novel, small, and high efficient pump. This reciprocating and electromagnetic pump is constructed of coils and magnet that provides thrust for the pump by the Lorentz force. The experimental data had been compared with those obtained by Lu [25]. The operation of the coils is controlled by the square-wave pulse. Different duty cycle, frequency, voltage, and electric current of the coils results in different square-ware pulse. The experimental parameters include the turns of coil, diameter of copper wire, length of magnet, length of magnet chamber, and magnet rings of the pump. Moreover, the performance of the pump was investigated by the flow rate and the pressure head of the pump.
The experimental results show that the best performance can be obtained when the length of magnet is 12.5mm. In addition, the operation of the magnet has optimal performance with optimal frequency and duty cycle. Even though increasing the voltage and current of the coils will result in increasing the initial velocity and frequency of the magnet and the flow rate of the pump, the performance per unit energy of the pump will decrease. The magnet rings of pump can increase the efficiency of the pump and retard the impact between the magnet and the chamber. The outlet pressure of a shorter chamber is higher than that of a longer chamber. However, due to the impact involved in the operation between the magnet and the chamber, a pump with a shorter chamber does not work very well when the operating frequency is greater than 60 Hz. In a contrary, a pump having a longer chamber performs better with a higher frequency of the magnet, although the outlet pressure of the pump is lower than that of a pump having a shorter chamber.
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