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김홍빈(Hongbin Kim),이병휘(Byonghuee Lee),허건수(Kunsoo Huh) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Linear motors are easily affected by load disturbance, force ripple, friction, and parameter variations because there is no mechanical transmission to reduce the effects of model uncertainties and external disturbance. These nonlinear effects have been reduced for high-speed/high-accuracy position control either through better motor design or via the better control algorithm that can compensate the nonlinear effects. In this paper, a nonlinear adaptive control algorithm is designed and applied for the position control of permanent magnet linear synchronous motor (PMLSM). In order to estimate and compensate the nonlinear effects such as friction and force ripple, the estimation and the nonlinear adaptive control laws are derived based on the virtual control input and a suitable Lyapunov function. The proposed controller is evaluated through the computer simulations. The control algorithm is also implemented to a DSP board and interfaced to the PMLSM for verifying the real-time control performance.
마찰력 및 리플력 추정을 통한 X-Y 축 리니어 모터의 비선형 적응제어
허건수(Kunsoo Huh),한상오(Sangoh Han),이병휘(Byonghuee Lee),김홍빈(Hongbin Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
The linear motors are easily affected by load disturbance, force ripple, friction, and parameter variations because there is no mechanical transmission to reduce the effects of model uncertainties and external disturbance. For high-speed/high-accuracy position control of a linear-motor-driven X-Y table, a nonlinear adaptive controller including a cross-coupling algorithm is designed in this paper, where the nonlinear effects such as friction and force ripple are estimated and compensated. A cross-coupling algorithm is adopted to reduce the contour error of the two-axial system. The proposed controller is evaluated through the computer simulations and its performance demonstrates the effectiveness of the proposed controller.
CNC 공작기계의 절삭력 감지를 위한 주축모터의 역률 및 마찰특성에 관한 연구
홍성함,이병휘,허건수 한국공작기계학회 2002 한국공작기계학회 추계학술대회논문집 Vol.2002 No.-
Real-time monitoring and control of the cutting force is essential for unmanned cutting process. Although the cutting force can be measured directly using tool dynamometers, their implementation is not feasible in industry due to high cost. Alternative approach is the cutting force estimation based on spindle drive models, but it requires the knowledge of their characteristics with the spindle speed variation. This paper investigates the power-factor and frictional characteristics of three-phase induction motors and determines its characteristics below and above the base speed, respectively. In order to realize the proposed cutting force monitoring system, a stand-alone DSP board was utilized. Its monitoring and control performance is evaluated in a CNC lathe.