Improvement of dynamic characteristics for optical pickup actuator by magnetic circuit

2003 ◽  
Vol 9 (4) ◽  
pp. 232-242 ◽  
Author(s):  
K.-T. Lee ◽  
C.-J. Kim ◽  
N.-C. Park ◽  
Y.-P. Park
Keyword(s):  
Dynamic Characteristics ◽  
Magnetic Circuit ◽  
Optical Pickup

Improvement of Dynamic Characteristics for Symmetric-Type Slim Optical Pickup Actuator by Changing Coil Shape

2007 ◽  
Vol 43 (2) ◽  
pp. 808-810 ◽  
Author(s):  
Dong-Ju Lee ◽  
Myeong-Gyu Song ◽  
Choong Kim ◽  
No-Cheol Park ◽  
Young-Pil Park ◽  
...  
Keyword(s):  
Dynamic Characteristics ◽  
Optical Pickup ◽  
Coil Shape

Improvement of dynamic characteristics for optical pickup actuator using sensitivity analysis

2002 ◽  
Vol 9 (1-2) ◽  
pp. 25-30 ◽  
Author(s):  
K.-T. Lee ◽  
D.-J. Lee ◽  
N.-C. Park ◽  
Y.-P. Park
Keyword(s):  
Sensitivity Analysis ◽  
Dynamic Characteristics ◽  
Optical Pickup

High-Sensitivity Actuator with New Magnetic Circuit in Optical Pickup

2008 ◽  
Vol 47 (7) ◽  
pp. 5809-5811 ◽  
Author(s):  
Buqing Zhang ◽  
Jianshe Ma ◽  
Longfa Pan ◽  
Xuemin Cheng ◽  
Hua Hu ◽  
...  
Keyword(s):  
Magnetic Circuit ◽  
High Sensitivity ◽  
Optical Pickup

Robust design of a novel three-axis fine stage for precision positioning in lithography

2010 ◽  
Vol 224 (4) ◽  
pp. 877-888 ◽  
Author(s):  
D-J Lee ◽  
K Kim ◽  
K-N Lee ◽  
H G Choi ◽  
N-C Park ◽  
...  
Keyword(s):  
Dynamic Characteristics ◽  
Structural Design ◽  
Magnetic Circuit ◽  
Magnetic Coupling ◽  
Access Time ◽  
Precision Positioning ◽  
Element Analysis ◽  
High Bandwidth ◽  
Dual Stage ◽  
Fast Access

The precision positioning system for semiconductor lithography requires a robust structural design to obtain enough control bandwidth and an efficient actuator with fast access time. In this article, a three-axis stage is proposed as a fine stage of a dual stage for the precision positioning. Its actuators are voice coil motors (VCMs) whose coil windings are mounted on the coarse stage and its magnets are on the fine stage. Between the fine and coarse stages, there is no mechanical connection but only magnetic coupling. The eight pairs of magnets and four coil windings are arrayed symmetrically. The three-axis stage's dynamic characteristics are improved by enhancing the actuating force and modifying its own structure using finite-element analysis in order to meet its requirements of high bandwidth and large forces. The actuating force is strengthened by modifying each VCM's magnetic circuit. The structure is designed to be robust by using design of experiment (DOE) as well. The modified stage is verified to have enough dynamic characteristics through experiments.

A Numerical Method for Predicting the Dynamic Performance of Electromechanical Relays

1974 ◽  
Vol 41 (2) ◽  
pp. 360-362 ◽  
Author(s):  
G. L. Elliott
Keyword(s):  
Numerical Method ◽  
Dynamic Characteristics ◽  
Magnetic Circuit ◽  
Dynamic Performance ◽  
Equations Of Motion ◽  
Predicted Values ◽  
Electromagnetic Relays ◽  
Good Agreement

This paper describes a method for estimating the dynamic characteristics of electromagnetic relays. The equations of motion are formulated based on a constant core reluctance model magnetic circuit and then solved using an extended de Vogelaere method. Good agreement is found between the predicted values and those measured in practice.

Invited PaperTemperature dependence of SiGe HBT static and dynamic characteristics

1998 ◽  
Vol 08 (PR3) ◽  
pp. Pr3-81-Pr3-86
Author(s):  
F. Aniel ◽  
N. Zerounian ◽  
A. Gruhle ◽  
C. Mähner ◽  
G. Vernet ◽  
...  
Keyword(s):  
Dynamic Characteristics ◽  
Static And Dynamic Characteristics ◽  
Sige Hbt

Effects of contact gap on nondestructive evaluation using magnetic measurement for ferromagnetic steel

2020 ◽  
Vol 64 (1-4) ◽  
pp. 969-975
Author(s):  
Hiroaki Kikuchi ◽  
Yuki Sato
Keyword(s):  
Magnetic Flux ◽  
Nondestructive Evaluation ◽  
Effective Permeability ◽  
Magnetic Circuit ◽  
Magnetic Measurement ◽  
Air Gap ◽  
Motive Force ◽  
Hysteresis Curve ◽  
Evaluation Technique ◽  
Ferromagnetic Steel

We investigated effects of contact gap on magnetic nondestructive evaluation technique using a magnetic single-yoke probe. Firstly, we evaluated hysteresis curves and impedance related to permeability of the material measured by a single-yoke probe, when an air gap length between the probe and specimens changes. The hysteresis curve gradually inclines to the axis of the magneto-motive force and magneto-motive force at which the magnetic flux is 0 decreases with increasing the gap length. The effective permeability also decreases with increasing the gap thickness. The incremental of gap thickness increases the reluctance inside the magnetic circuit composed of the yoke, specimen and gap, which results in the reduction of flux applying to specimen.

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