• Journal of Magnetics
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• v.15 no.2
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• pp.64-69
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• 2010

This paper describes the development of a novel transverse flux linear motor (TFLM) excited by permanent magnets (PMs). It combines the advantage of two different TFLMs and produces high thrust with reduced normal force. The magnetic field is analyzed by combining the three-dimensional (3D) equivalent magnetic circuit network (EMCN) method with 2D finite element analysis. The experimental findings of the prototype motors are in good agreements with the analysis results, and demonstrate the potential of the proposed motor as a direct drive requiring relatively long displacement of a mover.

• Proceedings of the KIEE Conference
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• 1990.11a
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• pp.32-36
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• 1990

LPM is a characterized motor to reciprocate linear motion for the office automation(OA), the factory automation(FA) and the field of information instruments because it can generate direct drive without any mechanical converter. For the design and analysis of permanent magnet type linear, pulse motor, it is therefore necessary to investigate the characteristics of magnetic flux distribution, static and dynamic thrust force, normal force, etc, by analyzing its magnetic circuit. This paper describes various useful methods for improving the characteristics of LPM. And these method is adopted on the PM and flat type, double side 2-phase 8-pole LPM.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2006.11a
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• pp.484-487
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• 2006

In this paper, linear ultrasonic actuators are designed using two dimensional motions of a PMW-PT piezoelectric plate. By equalizing the natural frequencies of longitudinal and transverse vibration modes in the cantilever structure, the ultrasonic motion of the combined vibration modes are generated. We have designed two different PMN-PT actuators: one uses a tip attached on the edge of the actuator and it drives the object in the perpendicular direction of the tip. In other model, the actuator plate moves itself through stationary guides. Prototypes of the two models are manufactured and experiments results are compared to the theoretical and numerical results. The effects of structural characteristics and the friction force existing between the actuator tip and the moving object are considered. Experiments show the possibility of small size ultrasonic linear motors which can be applicable to small form factor information storage and phone camera actuators.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.53 no.5
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• pp.318-324
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• 2004

In the recently, the necessity of linear position control motors have been increased in the various fields of the automatic control system. In this paper, we have designed the tooth models of the hybrid type linear stepping motor(HLSM); rectangular type(RT), triangle type(TrT), round type(RdT) and wedge type(WT), and proposed the optimum tooth shape of the HLSM by simulating(Flux2D) the thrust and normal force characteristics with the finite element method(FEM) and the virtual work method. And we have manufactured the prototype HLSM with the optimum tooth, and measured the various values by using experimental system. Thus, we have confirmed the justice of theory because the computed and the experimental results almost coincide with.

• Proceedings of the KIEE Conference
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• 2003.04a
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• pp.116-118
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• 2003

The Slotless Permanet-magnet linear synchronous motors (PMLSM) have been developed for factory automation, transportation applications, wafer steppers, conveyance system, and so on[1]. The current analysis and design are treated in air-cored PMLSM. The main purpose of this paper is to provide a general design and analysis framework for the iron-cored linear permanent-magnet machines. Based on field solution using two dimensional analytical technique the magnetic field required magnet volume size, optimal winding thickness size, winding flux linkage and thrust will be discussed.

• Proceedings of the KIEE Conference
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• 2001.07b
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• pp.1160-1164
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• 2001

The input voltage of linear Induction motors(LIMs) is involved with the time harmonics because most LIM is driven by inverter. Therefore the equivalent circuit for an inverter-fed LIM has to be modifided to represent every harmonic present in supply voltage. This paper describes that the dynamic characteristic can be used effectively for analyzing the characteristics of a linear induction motor position and speed control.

• 제어로봇시스템학회:학술대회논문집
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• 1996.10b
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• pp.395-398
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• 1996

In this study, when the nonlinear overhead crane which allows simultaneously travel and traverse motion moves a desired transport route, the object suspended the end of rope does undesirable swing motion. Nonlinear overhead crane pertubes in the vicinity of an operating point, therefore the nonlinear overhead crane is modified to linear overhead crane for the operating point. The linear overhead crane was controlled to swing angles of the object by the ratio of torque inputs to motors of the girder and the trolley. As a basis for the result of the linear overhead crane, the nonlinear overhead crane was controlled swing angles of the object and positions of the overhead crane without collision with environmental equipment by partial state feedback control.

• Proceedings of the KSME Conference
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• 2001.11b
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• pp.172-176
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• 2001

A Stirling cryocooler is relatively compact, reliable, commercially available, and uses helium as a working fluid. The FPFD stirling cryocooler consists of two compressor pistons driven by linear motors which makes pressure waves and a pneumatically driven displacer piston with regenerator. A free piston and free displacer(FPFD) Stirling cryocooler for cooling infrared and cryo-sensors is currently under development at KIMM(Korea Institute of Machinery & Materials). In order to evaluate the feasibility of using a linear motor driving cryocooler, prototype Stirling cryocooler with a nominal cooling capacity of 0.5W at 80K was designed, fabricated and tested. The prototype has achieved no load temperature of 51K and cooling power of 0.33W.

• The Journal of the Acoustical Society of Korea
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• v.20 no.8
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• pp.38-43
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• 2001

We developed a new standing wave type ultrasonic linear motor that can be driven bi-directionally. The operation principle of the motor was derived in an analytical form and the detailed structure was designed by the finite element method. Based on the design, a motor sample and a driving circuit were fabricated, and validity of the structure was verified through experiments.

• Proceedings of the KSME Conference
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• 2008.11a
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• pp.902-906
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• 2008

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 highspeed/high-accuracy position control of a linear-motor-driven two axes, a nonlinear adaptive controller including a cross-coupling algorithm is designed in this paper. The nonlinear effects such as friction and force ripple are estimated and compensated. An enhanced approach for cross-coupling algorithm is proposed to effectively improve the biaxial contour accuracy with the closed-loop stability. The proposed controller is evaluated through the computer simulations.