Research on Active Lubrication Based on Piezoelectric Micropump

This paper mainly introduces the problem of active lubrication. At present, the technology of active lubrication for bearings in micro-space is not mature, and it is difficult to meet the requirements of micro-space lubrication. A piezoelectric micropump for active lubrication is proposed in this paper. The micropump has the advantages of compactness, embedding, high precision, and fast response. We analyze the performance of the micropump under different characteristics. When the applied frequency is 9.95 kHz, the voltage is 200 V and the oil viscosity is 0.001 Pa·s, and the pumping capacity can reach 0.8 μL. When the same excitation signal is used, the experimental pumping capacity reaches 0.76 μL. The theoretical and experimental error is 5.3%. For different bearing conditions, combined with the theoretical model of minimum oil film thickness, we propose the number of pulses to meet the micro-redundancy lubrication under different working conditions. These analyses provide a theoretical basis for active lubrication in micro-space.