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하이브리드 스러스트 마그네틱 베어링의 제어변수 도출 및 동특성 해석
장석명(Seok-Myeong Jang),이운호(Un-Ho Lee),성소영(So-Young Sung),최장영(Jang-Young Choi),김순용(Soon-Yong Kim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
This paper deals with control parameters deduction and dynamic analysis of hybrid thrust magnetic bearing(HTMB). The flux density at air-gap is obtained from system modeling which considers permanent magnet and electro magnet. The vertical force is derived from flux density using maxwell's stress tensor. An accurate linear model is obtained by using linear approximations of the attraction force around the nominal equilibrium point. The dynamic simulation of the HTMB using the PD controller is conducted and control parameters are deducted.
슬롯리스 영구자석 동기 전동기의 와전류 손실에 의한 드래그 토크 예측
장석명(Seok-Myeong Jang),이운호(Un-Ho Lee),최장영(Jang-Young Choi),박지훈(Ji-Hoon Park),고경진(Kyoung-Jin Ko),최지환(Ji-Hwan Choi) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.10
The torque is very essential for performance evaluation of electric machines because it is directly connected with power loss for dynamic characteristics, To evaluate dynamic performance, the torque with harmonic component according to time is introduced Especially, eddy current loss is significantly increased in high speed so it is difficult to express the dynamic characteristic without reflection about losses, Therefore, in this paper, rotor eddy current loss wave is derived by fast fourier transform(FFT) which is using the phase current wave obtained from finite element analysis(FEA) according to two conditions; one has rotor eddy current loss, the other is not. The core loss is deduced by a modified Steinmetz equation(MSE) and additional losses are considered from an experiment. Those losses are worked as drag torque which is inverse force to performance of a machine. The operating torque estimated from difference between drag torque and electric torque is closely reflects the dynamic characteristics.
슬롯리스 영구자석 동기 전동/발전기를 위한 설계변수 도출
장석명(Seok-Myeong Jang),이운호(Un-Ho Lee),유대준(Dae-Joon You),고경진(Kyoung-Jin Ko),이정필(Jung-Pill Lee) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.10
In high speed applications, the slotless permanent magnet(PM) motors appear an attractive solution, being almost insensitive to magneto-motive force harmonics and to pulse width modulation(PWM) current ripple and exhibiting lower stator iron losses and rotor losses (significant with square wave current control). So, this paper deals with methods for design of permanent magnet synchronous motor/generator.
성소영(So-young Sung),이운호(Un-Ho Lee),박종원(Jong-Won Park),장석명(Seok-Myeong Jang),임용곤(Y.G. LIM) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
This paper deals with controller design and dynamic simulation of hybrid magnetic bearing. The flux density at air-gap is obtained from system modeling which considers permanent magnet and electro magnet. The vertical force is derived yb that flux density using maxwell's stress tensor.