Affiliations: [a] Henan Key Laboratory of Super Hard Abrasives and Grinding Equipment, Henan University of Technology, Zhengzhou, China | [b] School of Electromechanical Engineering, Henan University of Technology, Zhengzhou, China | [c] School of Electrical Engineering, Henan University of Technology, Zhengzhou, China | [d] Zheng Zhou Research Institute of Mechanical Engineering CO., LTD, Zhengzhou, China
Correspondence:
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Corresponding author: Wei Feng, Henan Key Laboratory of Super Hard Abrasives and Grinding Equipment, Henan University of Technology, Zhengzhou, 45001, China; and School of Electromechanical Engineering, Henan University of Technology, Zhengzhou 450001, China. E-mail: [email protected]
Abstract: The unbalanced magnetic pull (UMP) is one of the main vibration sources of the motorized spindle. A calculation model of UMP in a synchronous motorized spindle considering the magneto-thermal coupling is proposed in this paper. The finite element analysis models of the electromagnetic field and the temperature field of a motorized spindle are first established. Then a two-way coupling analysis method considering the effect of temperature variations on electromagnetic material properties of the motor is proposed. An experiment is conducted to verify the efficiency of this method. The thermal deformations of the spindle are calculated and used to analyze the air-gap variations between rotor and stator of the built-in motor. The 3D finite element electromagnetic model is adopted to calculate the UMP in the motorized spindle. The analysis results show that the eccentricity caused by thermal deformation can generate large UMP in the motorized spindle.
Keywords: Unbalanced magnetic pull, synchronous motorized spindle, magneto-thermal coupling, air gap length, thermal deformation
