Research Of Vibration Reduction Of High Speed Spindle Based On Magnetic Bearing

As the main component of spinning twisting and winding system, spindle can directly affect the quality and production of textile products. With the continuous development of modern industry, the speed of spindle is increasing. The production capacity of enterprises has upgraded in this change, but it also brought many problems. The problems come from vibration of spindle such as short service time of spindle, large noise and unstable operation has aroused extensive concern to the researchers, and spindle vibration reduction has become a worldwide hot topic. In this application background, the magnetic bearing which is used in high-speed spindle vibration reduction was designed in this subject. The magnetic bearing adopted the repulsion of axial magnetized permanent magnet-type radial bearings, and analyzed the kinetics characteristics of permanent magnetic bearing -spindle based on the advantage such as no friction, no wear, no power consumption and no lubrication of permanent magnetic bearing and combined with the own support characteristics of high-speed spindle. Aimed at reducing high-speed spindle's radial amplitude, the results of vibration reduction with and without permanent bearings are obtained by a combination of simulation. At last, good effect of vibration reduction has achieved through the experimental verification.The dynamics theory analysis of magnetic bearings-spindle system is the main content in earlier stage work of this paper, and the content in later stage work is experiment results verify of magnetic bearings-spindle system.Firstly, obtained the mechanical properties of permanent magnetic bearings based on the equivalent magnetic charge method, and made the simulation which considering on a variety of factors in the design of permanent magnet bearing. Determined the structure of permanent magnetic which considering the actual conditions of high-speed spindle, to achieve the optimal performance of permanent magnet bearings which we designed.Secondly, analyzed the dynamics characteristics of permanent magnetic bearing's single-degree-of-freedom system, established the mathematical model of the permanent magnetic bearings-spindle system, and analyzed the dynamics characteristics of permanent magnetic bearing's multi-freedom system, then work out the vibration situation of spindle in the form of with and without permanent magnetic bearing by using software simulation and provide reference for later experiments.Finally, do the vibration reduction experiments of permanent magnetic bearing-spindle system which we deigned. Mainly include acceleration speed, constant speed and deceleration speed with and without permanent bearings on DGY-1-type spindle track measuring instrument. The vibration signals measured by piezoelectric acceleration senor, and entered to PC by data acquisition card, then get the vibration signal's analysis results through the analysis software. The results show that the amplitude of the spindle can be reduced by adding the permanent magnet in the high-speed bearings and consistent with the result of theory analysis.