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와전류와 히스테레시스가 자체 측정 자기베어링의 성능에 미치는 영향
노명규,정민경 충남대학교 산업기술연구소 2001 산업기술연구논문집 Vol.16 No.1
A preliminary analysis of the effects of eddy currents and magnetic hysteresis on the performance of self-sensing magnetic bearings is presented. A self-sensing magnetic bearing employs an estimator of rotor position utilizing the information available in the electromagnets, instead of using separate position sensors as in typical magnetic hearings. An estimator which embeds a model of the bearing is designed using parameter estimation technique. The performance of the estimator is briefly presented. The model of the bearing on which the estimator is based assumes that the magnetic material is perfectly linear without eddy currents and hysteresis. A simple analysis is carried out to see how the performance of the estimator is affected by eddy currents and hysteresis which can be substantial in high-performance magnetic bearings.
A Model of Magnetic Bearings Considering Eddy Currentsand Hysteresis
노명규 한국정밀공학회 2003 International Journal of Precision Engineering and Vol.4 No.3
A simulation model for radial magnetic bearings is presented. The model incorporates hysteresis, saturation and eddy current effects. A simple magnetization model that describes hysteresis and saturation is proposed. Eddy currents are taken into consideration by assuming that they are generated by single-turn fictitious coils wrapped around each magnetic flux path. The dynamic equations describing the simulation model can easily incorporate the operation of switching power amplifier. A simulation of a typical 8-pole radial magnetic bearing produces switching waveforms very similar to the experimental observation.