Abstract
In the early of 1950, the high response magnetic torque motor was developed for driving electro-hydraulic servo valves. Since then it has been broadly used for industrial application and the research of development or improvement of the torque motor is still being conducted. The purpose of this study is to present useful design criteria for the torque motor design. For this, torque motor is modelled and linearized. The static characteristics of the torque motor are investigated by direct computation of the derived linearlized equations. The dynamic characteristics of the torque motor are investigated with the derived transfer function by using Matlab and compared with the results of the linearlized analysis by using AMESim simulation with actual values of the physical parameters. Finally, the design criteria obtained from the analysis are reviewed. * Corresponding author: huh@koreatech.ac.kr 1 School of Mechatronics Engineering, Korea University of Technology and Education, Chonan 330-708, Korea 2 School of Electrical, Electronics and Communication Engineering, Korea University of Technology and Education, Chonan 330-708, Korea Copyright C 2015, KSFC This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License(http:// creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. 기호 설명 : radius of armature from pivot to pole, m : viscous damping coefficient of mechanical armature mounting, m-N-s : signal voltages from amplifier, volts : signal voltage input, V : constant voltage required for quiescent current, V : length of air gap at neutral, m : current in each coil, A : constant quiescent current, A : signal current in each coil, A ∆ : current difference, A : inertia of armature, m-N-s 2 : mechanical torsion spring constant of armature pivot, m-N/rad : back emf constant for coils, volts/rad/s : magnetic spring constant of torque motor, m-N/rad : torque constant of the torque motor, m-N/A : self-inductance of each coil, H : number of turns in each coil : internal resistance of amplifier, Ω : resistance of each coil, Ω : reluctance of gap at neutral, A-turn/Wb : any arbitrary load torque on the armature, m-N : displacement of the armature tip, m : impedance in common line, Ω : amplifier gain : total magnetic flux, Wb : magnetic flux at neutral air gap, Wb
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