• Proceedings of the KIEE Conference
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• 1998.07a
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• pp.322-324
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• 1998

This paper describes the characteristics analysis of surface permanent magnet linear synchronous motor with conductive sheet secondary using time-stepped finite element method. The detent force, normal force, back-emf and dynamic characteristics as speed, thrust and current are described.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.57 no.2
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• pp.127-134
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• 2008

In this paper, we propose a robust adaptive backstepping control of induction motors with uncertainties using nonlinear disturbance observer(NDO). The proposed NDO is applied to estimate the time-varying lumped uncertainty which are derived from unknown motor parameters and load torque, but NDO error does not converge to zero since the derivate of lumped uncertainty is not zero. Then the fuzzy neural network(FNN) is presented to estimate the NDO error such that the rotor speed to converge to a small neighborhood of the desired trajectory. Rotor flux and inverse time constant are estimated by the sliding mode adaptive flux observer. Simulation results are provided to verify the effectiveness of the proposed approach.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.57 no.12
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• pp.2194-2198
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• 2008

In this paper, the construction of secondary reaction plate is analyzed by 3-D Finite Element Method(3-D FEM) to consider the influence of its variation on the transverse edge effect of LIM. The effective 3-D analysis model for considering the transverse edge effect caused by the finite widths of the primary and the secondary is proposed. The simple method measuring the transverse edge effect by using the patterns of currents induced in the secondary reaction plate is also proposed. With this effective analysis method, various models of secondary reaction plate with overhang and cap has been analyzed to consider the relationship between the construction of secondary reaction plate and the transverse edge effect of LIM.

• Proceedings of the KIPE Conference
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• 2005.07a
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• pp.240-242
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• 2005

The linear hybrid stepping motors (LHSM) has been widely used due to its simple structure and low cost control. Despite of its attractive features, the conventional LHSM has the multiples of 4th times harmonic reluctance force from excitation current and cogging force from space harmonic of permeance. This paper propose a new LHSM, which the mechanical and electrical phase difference are 45$^{\circ}$. The proposed motor shows a unique ability to deliver low detent force and we propose a closed-loop control scheme to attack the ripple force for high performance applications. An analytical and experimental comparison between conventional and proposed LHSM is evaluated to confirm the effectiveness of the proposed modeling and control scheme.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.43 no.4
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• pp.580-586
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• 1994

The equivalent circuit of linear induction motor is generally expressed as the same that of rotary induction motor. However, it is almost impossible to perform the no-load test for LIM, because it needs a special equipment for synchronous speed. Therefore, a new method is reqnired to calculate the performance of the LIM without the no-load test. In this paper, The new method which does not need no-load test for the chanracteristics analysis of LIM is proposed. The equivalent circuit of LIM is chosen and the method if determining its constants from results of the lock test is discussed. The calculated results were satisfied by compare with experimental and conventional method results.

• Proceedings of the KIEE Conference
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• 1999.07a
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• pp.9-11
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• 1999

A brushless and slotless DC linear motor(LDM)employing a movable set of neodymium-iron-boron type of magnets has high performances in advantages of large thrust per weights and accurate position control. But the Moving Magnet LDM produces thrust ripples owing to mainly end-effects, shape and magnetization of permanent magnets and so on. This paper represents the improvements of thrust ripples using the finite elements methods and phase control topology.

• Proceedings of the KIEE Conference
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• 1999.07a
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• pp.136-138
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• 1999

Linear Induction Motors (LIMs) with the long secondary conductor often have joints between the segmented secondary, which are specially used for magnetically levitated high-speed vehicle and elevators. In this paper, the dynamic characteristics of the LIM with joints in the secondary are investigated using the time-stepping finite element analysis. It is supposed that both aluminium conductor and back-iron have joint in the active zone during the analysis. As a result, thrust and normal force ripple which have effects on the motor dynamics and vibration are examined.

• Proceedings of the KIEE Conference
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• 1999.07a
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• pp.139-141
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• 1999

This paper presents the design schemes for the improvement of force characteristics in Controlled permanent magnet linear synchronous motor (CPMLSM). The dependence of motor performance on various design schemes, such as the slot shapes, magnetizing patterns of PM and skewing, have been investigated in detail by using FEM and experiment. From this study, it is known that in the various design schemes, skewing is most efficient in the aspects of force characteristic, efficiency and force density.

• Proceedings of the KIEE Conference
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• 1999.07a
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• pp.148-150
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• 1999

This paper deals with characteristic analysis of Permanent Magnet Linear Synchronous Motor(PMLSM). Parameters and characteristic variations are evaluated by using Finite Element Method (FEM) and Equivalent Magnetizing Current Method. PMLSM can be classified into the short primary type PMLSM and the short secondary type PMLSM according to their structural features. Especially, the short secondary type PMLSM is focused on because of good control characteristics. And this paper presents the difference of analysis results between the short primary type PMLSM and short secondary type PMLSM and investigates the end effect of two PMLSM's.

• Proceedings of the KIEE Conference
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• 2000.07b
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• pp.843-845
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• 2000

Many linear motion devices in industry require a limited movement in which the moving member oscillates. Such motion is often governed by a prescribed distance-time relationship.