LMS 알고리듬을 이용한 하중계 내장형 능동 자기베어링 시스템의 운전중 위치 및 전류 강성계수 규명

Abstract

A modified least-mean-square(LMS) algorithm is employed for on-line parameter identification of an active magnetic bearing(AMB) system while it is in operation. The AMB system is equipped with built-in piezo-electric type force transducers so that the magnetic force can be directly measured. The algorithm, based on a simple linearized magnetic force equation, utilizes three kinds of measured signals, i.e. rotor displacement, control current, and magnetic force. The simulation and experimental results show that the proposed algorithm is very effective in adaptively identifying the current and position stiffnesses of the AMB.