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In order to reveal the influence of air gap variation on dynamic characteristics of high speed motorized spindle, mathematic models of centrifugal expansion and thermal expansion are established based on elastic mechanics, results show air gap was remarkably reduced by the expansions of stator and rotor. Change rules of radical magnetic flux density and radical electromagnetic force of air gap were calculated with FEA software based on electromagnetic vibration theory, results show the magnetic density and electromagnetic force increased with air gap decreasing, fundamental and harmonic waves of the two parameters increased obviously as well, which lead to a further vibration of the stator, dynamic characteristics was dropt either.

Electromagnetic Vibration Analysis of High Speed Motorized Spindle Considering Length Reduction of Air Gap