Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
권호 표지

Analysis and Control of a 3-Phase VR Type Self-Bearing Step Motor for Small Angle Control Considered the fringing Effect

프린징효과를 고려한 미세각도 제어용 3상 가변형 셀프베어링 스텝모터의 해석 및 제어

  • Kim, Daegon (Mechanical Engineering, University of Kentucky)
  • Published : 2001.10.01
Download PDF
⟨ Previous Next ⟩

Abstract

The analysis and control of a new type unsymmetrical slotted self-bearing step motor for small angle control is presented. The motor actuator is used for both motor and bearing functionality without any additional coil windings or electromagnets for bearing functionality. A circular-arc, straight-line permeance model for the fringing effect is presented. An unsymmetrical slotted self-bearing step motor layout and control algorithm are described. A new control current generation method using the electromagnets layout geometry, which needs no additional current for bearing functionality, is proposed. As the result of this analysis the fringing effect largely influences on the system characteristics. especially in torque. Even if the bearing functionality is added into the motor functionality, it is shown that the magnitude of torque is not changed.

Keywords

References

  1. Daegon Kim, 'The Influence of the Machining and Assembling Errors on the Performance of the Shaft Supported by Active Magnetic Bearings,' Ph.D.Dissertaton, Mechanical Engineering, KAIST, 1998
  2. Higuchi, 'Magnetically Floating Actuator Having Angular Positioning Function,' US Patent, No 4683391, 1987
  3. Bischel, J., 'The bearingless electrical machine,' Proc. of Int. Symp. On Magn. Suspension Technol. 91, NASA Publication 3152, pp. 561-573, 1991
  4. Chiba, A., Rahman, M.A., and Fukao, T., 'Radial forces in bearingless reluctance motor,' IEEE Trans. On Magnetics, Vol. 27, No. 2, pp. 786-790, 1991 https://doi.org/10.1109/20.133292
  5. L. S. Stephens and Daegon Kim, 'A SegmentedArc Self-Bearing Motor,' US Patent Office-Technical Application, Patent Pending, 1999
  6. Stephens, L.S. and Kim, D.G., 'Analysis and Simulation of a Lorentz-type, Slotless Self-Bearing Motor,' Proc. of the 1st IFAC Conf. On Mechatronics, pp. 463-468, 2000
  7. Steele, B.A. and Stephens, L.S., 'A Test Rig for Measuring Force and Torque Production in A Lorentz, Slotless Self Bearing Motor,' Proc. of 7th Int. Symp. On Magn. Bearings, pp. 407-412, 2000
  8. Hanselman, D.C., 'Brushless Permanent-Magnet Motor Design,' McGraw-Hill, Inc., 1994
  9. Takashi Kenjo, 'Stepping Motors and Their Microprocessors Controls,' Oxford Science Publications, pp. 66-80, 1984