Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
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Effects of Rotor Misalignment in Airgap on Dynamic Response of an Eccentric Rotor in BLDC Motor

  • Kim, Tae-Jong (School of Mechanical Engineering and Research Institute of Mechanical Technology, Pusan National University) ;
  • Kim, Kyung-Tae (School of Mechanical Engineering and Research Institute of Mechanical Technology, Pusan National University) ;
  • Hwang, Sang-Moon (School of Mechanical Engineering and Research Institute of Mechanical Technology, Pusan National University) ;
  • Park, No-Gill (School of Mechanical Engineering and Research Institute of Mechanical Technology, Pusan National University) ;
  • Lee, Shi-Bok (School of Mechanical Engineering and Research Institute of Mechanical Technology, Pusan National University)
  • Published : 2002.12.01
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Abstract

Vibration of a BLDC motor is a coupled phenomenon between mechanical characteristics and magnetic origins which takes place through the motor airgap. When relative misalignment of a rotor in the airgap is introduced during assembly, the dynamic characteristics of the motor system are affected. The rotor-motor system used in a washing machine is modeled using FETM and magnetic forces in a BLDC motor with radial rotor eccentricity are determined analytically The transient whirl responses of a rotor system supported on two roller bearings with relative misalignment in the motor airgap are investigated by considering mechanical and magnetic coupling effects. Results show that rotor misalignment in the airgap considerably affects the vibration of the rotor-motor system.

Keywords

References

  1. Jang Gunhee and Lieu, Dennis K., 1996, 'Analysis of the Magnetic Force and the Torque in a Brushless DC Motor,' KSME International Journal, Vol. 10, No.1, pp. 37-48
  2. Kim Tae-Jong, Hwang Sang-Moon and Park No-Gill, 2000, 'Analysis of Vibration for Permanent Magnet Motors Considering Mechanical and Magnetic Coupling Effects,' IEEE Transactions on Magnetics, Vol. 36, No.4, pp.1346-1350 https://doi.org/10.1109/20.877688
  3. Kim Ungtae and Lieu, Dennis K., 1998, 'Magnetic Field Calculation in Permanent Magnet Motors with Rotor Eccentricity: With Slotting Effect Considered,' IEEE Trans. Mag. Vol. 29, pp.2253-2266 https://doi.org/10.1109/20.703863
  4. Kumar, A. S. and Sankar, T. S., 1986, 'A New Transfer Matrix Method for Response Analysis of Large Dynamic Systems,' Computers & Structures, Vol. 23, No.4, pp.545-552 https://doi.org/10.1016/0045-7949(86)90097-0
  5. Subbiah, R. and Kumar, A. S., 'Transient Dynamic Analysis of Rotors Using the Combined Methodologies of Finite Elements and Transfer Matrix,' Journal of Applied Mechanics, Trans. ASME, Vol. 55, pp. 448-452
  6. Yoon Yeo-Kwon, Jeong Ho-Seop and Lee Chong-Won, 1997, 'Compensation of Tool Axis Misalignment in Active Magnetic Bearing Spindle System' KSME International Journal, Vol. 11, No.2, pp. 155-163