Output performance of piezoelectric pump driven by different excitation signals
LI Dinghua1, 2, JIA Junrui2, LI Yanlin3, HUANG Jun4
1.School of Electrical Engineering, Nantong University, Nantong, Jiangsu 226019, China; 2.Department of Mechatronics, Nantong Vocational & Technical Shipping College, Nantong, Jiangsu 226010, China; 3.Department of Enrollment and Employment, Nanjing Vocational Institute of Transport Technology, Nanjing, Jiangsu 211188, China; 4.National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China
Abstract:To investigate output performance of valveless piezoelectric pumps driven by different excitation signals, a valveless piezoelectric pump with cone-shaped tubes was used in the paper. According to the mathematical equations of commonly used driving signals, such as sinusoidal, square and triangular waves, the vibration characteristics of the vibrator driven by these signals were analyzed. Then the performance of liquid transport in the pump and the vibration characteristics were measured by using deionized water. The experimental results show that the pump flow rate increases initially and then decreases with increasing driving frequency of these excitation signals. The maximum pump flow rate is 1.86 g/min for the square wave(9 Hz, 100 V), but the minimum flow rate is 1.29 g/min for the triangular wave. The maximum amplitude of the piezoelectric vibrator is 64.82 μm for the square wave, but the minimum amplitude is 52.29 μm for the triangular wave. Note that the pump flow rate versus piezoelectric vibrator amplitude curves show the amplitude is not the only factor affecting he output flow of the pump. After a comprehensive comparison, it is found that the piezoelectric pump driven by square wave has the best output performance, but its vibrator is noisier in operation, thus the pump application will be limited inevitably.
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