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http://dx.doi.org/10.3795/KSME-A.2009.33.10.1038

Dynamic Analysis of a 3-Phase BLDC Motor Considering Variation of an Air-Gap  

Park, Ki-Sun (LIG NEX1 기계연구센터)
Im, Hyung-Bin (한양대학교 대학원 기계공학과)
Chung, Jin-Tai (한양대학교 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.33, no.10, 2009 , pp. 1038-1044 More about this Journal
Abstract
In this study, vibrations of an electric motor are analyzed when the motor has the interaction between mechanical and electromagnetic behaviors. For this vibration analysis a 3-phase 8-pole brushless DC motor is selected. Vibrations of the motor are influenced by coupled electromechanical characteristics. The variation of air-gap induced by vibration has an influence on the inductance of the motor coil. To analyze dynamic characteristics of the rotor, we studied inductance by the variation of an air-gap. After obtaining the kinetic, potential and magnetic energies for the motor, the equations of motion are derived by using Lagrange's equation. By applying the Newmark time integration method to the equations, the dynamic responses for the displacements and currents are computed.
Keywords
Brushless DC Motor; Inductance; Flux Linkage; Air-Gap; Electromechanical Equation; Lagrange's Equation;
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