Stay Precision machining In process ， Electromagnetic shafting is mainly used for some instruments 、 In instrument ， Pictured 2-34 Shafting rotation shown is particularly sensitive ， Can react to small differences ， Also used for some NC machining Machine tool ， Stay Parts processing customized service center Widely applied 。

　　 Pictured ２-35 Shown ， Chart 2-35(a) Shown Principle of shafting ， Chart 2-35(b) Shown Famous for Switzerland Precision machining Factory ——IBAG High frequency motor spindle developed by the company ， Magnetic bearing with excitation ， Speed up 2000~4000r/min， Maximum radial bearing capacity 1000N， The principle is to use 180° The two arranged electromagnets produce radial opposite suction ( Or repulsive force ) Make spindle Stay Rotation in air magnetic field ， No friction in rotation 、 No wear 、 Less fever 、 Rigidity 、 Noiseless 、 No lubrication ， The clearance between the main journal and the shaft sleeve is generally selected as 1mm， The position of the spindle can be measured by a non-contact displacement sensor ， Signal processing can be based on the measured value 10000 Second /s The current value of correcting the position of the spindle is calculated by the speed of ， At present, the rotary accuracy of this kind of shafting can reach 0.03~0.05um， Principal axis Speed up 10000~100000r/min， The linear speed of the journal can reach 200m/s， Velocity factor dmn=4×1000000mm·r/min， Bearing capacity up to 300000N。 The spindle speed of electromagnetic magnetic axis system is the same as that of conventional machine tool 10 More than twice ， It can be seen that the speed of the spindle has entered the acceleration design stage from the speed design stage 。