Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Design of Cone-Shaped Magnetic Bearing Spindle System for High Speed Internal Grinding Machine

내면연삭기 고속 주축용 원추형 자기베어링시스템 설계

  • 박종권 (한국기계연구원 자동화연구부) ;
  • 노승국 (한국기계연구원 자동화연구부) ;
  • 경진호 (한국기계연구원 신교통기술연구부)
  • Published : 2002.02.01
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Abstract

A cone-shaped active magnetic healing spindle system for high speed internal grinding with built-in motor that has 7.5kW power and maximum rotational speed of 50,000 rpm is designed and built. Using cone-shaped AMB(Active Magnetic Bearing) system, the axial rotor dick and magnets of conventional 5-axis actuating design can be eliminated. so this concept of design provides a simple magnetic bearing system. In this paper, the cone-shaped electromagnets are designed by magnetic circuit theory, and a de-coupled direct feedback PID controller is applied to control the coupled magnetic bearings. The designed crone-shaped AMB spindle system is built and constructed with a digital control system, which has TMS320C6702 DSP, 16 bit AD/DA, switching power amplifier and gap sensors. As the AMB system provides high damping ratio eliminating overshoot and resonance speed, this spindle runs up to 40,000 rpm stably with about 5${\mu}{\textrm}{m}$ of runout.

Keywords

References

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