Low cost piezo actuator11/5/2023 ![]() The working principle of the piezo-pump is shown in Fig. The piezoelectric actuator converts electrical energy into mechanical energy to drive the directional movement of the fluid, thereby converting mechanical energy into kinetic or potential energy. Table I shows a comparison of the typical parameters of the pumps.Īs one of the most typical precision fluid pumps, the piezo-pump works based on the mechanism of the inverse piezoelectric effect of the piezoelectric actuator. The above studies are all single-chamber piezoelectric pumps composed of an unimorph piezoelectric actuator combined with check valves. It has a maximum flow rate of 18.1 ml/min without external load, but the output pressure is limited. 21 described a low-frequency-driven piezoelectric pump with a flexible valve that enables precise flow control by adjusting the drive voltage or frequency. 20 introduced a miniature piezoelectric pump with umbrella valves, with a maximum flow rate of 271 ml/min and unresolved output pressure. Experimental results show that the pump can obtain a maximum flow rate of 163.7 ml/min and a maximum back pressure of 29.7 kPa under specific working conditions. 19 proposed a dual-frequency micropump to improve the performance of piezoelectric micropumps in specific applications. The flow rate reached 196 ml/min in the experiment, but there was almost no output pressure. The main features of the proposed micropump are self-sucked and high flow rates in the low-frequency range. ![]() 18 reported a novel piezoelectrically driven micropump that enables high flow rates. A maximum flow rate of 1.82 ml/min and a maximum output pressure of 32 kPa were obtained with a small size. Cheng and Tseng 17 presented a miniature pump with check valves. Piezo-pumps for water-cooling systems require a high flow rate and output pressure in a small volume. The proposed piezoelectric pump has the characteristics of simple structure, high performance, small size, and low cost, which can be applied in microelectronic cooling, biomedical, and other fields. In addition, at 70 Hz, 180Vpp, the comprehensive performance of the piezoelectric pump is better, with a flow rate above 3 ml/min and an output pressure over 35 kPa. The maximum flow rate of 4.5 ml/min is obtained when the pump is driven by an offset sinusoidal voltage of 180Vpp at 50 Hz the maximum output pressure of the pump reaches 52 kPa under 180Vpp at 150 Hz. The experimental results show that the pump has good self-suck ability under well-assembled process conditions, which provides a guarantee for the high flow rate and the output pressure of the piezoelectric pump. The corresponding experimental prototype was made for the output performance assessment. The working principle of the piezoelectric pump was described, and the theoretical working characteristics of the cantilever check valve were analyzed in detail. A single-chamber piezoelectric pump with a circular unimorph piezoelectric actuator and cantilever check valves is proposed in this work, which has good output performance and smaller overall size. Piezotechnics is experienced in highly dynamic actuation.The high performance and miniaturization of the piezoelectric pump are essential for its application. Sufficient measures has be taken to avoid excessive temperatures:Ĭontact Piezotechnics if high power levels are required. Continuous dynamic operation can generate high losses and the piezo stack may rapidly heat up. Damping is effective in piezoelectric materials and in dynamic operation losses occurs with resulting heating of the Highly dynamic operation of a piezoelectric actuator results in high levels of mechanical (force x speed) and electrical The following equations illustrates the mechanical response quite below and beyond the mechanical The realizable displacement of an actuator in sinusoidal operation is given by theĮquilibrium of the piezoelectric force and the force needed to accelerate the effective mass. At higher frequencies the stroke is limited by the inertia of the effective actuator mass. The low frequency response of that basic actuator system is givenīy the free stroke. The actuator itself represents a spring mass system with low damping rate. The dynamic response of a piezo actuator and connected mechanical load to the electrically controlled piezoelectric force isĭetermined by masses, stiffness’s, and damping rates. ![]() The piezo in a fuel injector is used to generate several fast pulses during each Piezo is the superior actuator principle to control the injection process and superseded electromagnets. In modern car engines high-pressure fuel injectors are used to spray very precisely fuel into the combustionĬhamber. In dynamic actuation mode periodic (sine, square waves) or non-periodic waveforms (e.g.Ĭompensation of disturbances in a feedback control loop) are applied to the actuator.
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