The Improvement And Analysis On Non-contact Electromagnetic Loading Device Of Motorized Spindle

With the rapid development of industry,motorized spindle becomes more and more important in industry manufacturing,especially in CNC machines.In recent years,with the continuous improvement of CNC machines'performance,the motorized spindle becomes an important object in research.The loading experiment that simulates the actual working environment in laboratory becomes an effective method to motorized spindle's reliability analysis.This paper gives a systematic introduction of loading experiment about motorized spindle,and analyzes the main features of every device as well.For the self-designed non-contact electromagnetic loading device,the static electromagnetic force is calculated based on Maxwell equations,and verified through the finite element.The dynamic distribution of magnetic field is analyzed based on the electromagnetic theory,and the relationships between the radial?tangential force and current?rotation speed is also obtained.Furthermore,the Ansoft Maxwell is used for the analysis of dynamic electromagnetic force.The basic forming reason of eddy current is analyzed,besides,the eddy current loss is calculated.The laminated loading device is presented in this paper to solve the disadvantage of eddy current loss when motorized spindle works at high speed.The eddy current loss of laminated loading device is Calculated through integrating,and the advantage of the improved device is illustrated by theoretical calculation.For the temperature of loading disk rises rapidly during dynamic loading,the equal thermal circuit of solid disk and laminated disk are both build based on the similarity of thermal circuit and electric circuit;the relationship between temperature rising and rotate speed is obtained through analyzing,and the transient thermal simulation in the ANSYS is conducted.The two results are consistent,which verifies the accuracy of theory calculation,furthermore,the superiority of laminated structure in restraining temperature is also proved.The non-contact electromagnetic loading system is introduced,and the data of radial loading force and the loading temperature is collected.The accuracy of theory calculate and finite element simulation is verified by contrasting with experimental data.The research provides a reference for the improvement of performance and analysis to the motorized spindle loading device.