• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.1021-1022
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• 2007

By enforcing skew of permanent magnet, detent force decreases, but lateral force that acts for vertical direction of moving direction occurs. This force deteriorates various performance of PMLSM as that acts to friction force between mover and LM guide. Therefore, in this paper, V skew model is proposed for lateral force's reduction and simulation results are compared to experimental value.

• Proceedings of the KIEE Conference
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• 2006.04b
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• pp.121-123
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• 2006

In this paper, the notch of teeth and skew of permanent magnet are used to reduce the detent force caused by slot-teeth structure. Also, the shape of permanent magnet is optimized to reduce the detent forceowing to flux hannonics components of permanent magnet. As a result, thrust is decrease about 2[%]. But, the distortion ratio of thrust is decreased from 1.04[%] to 0.75[%]. And, the ripple ratio of thrust is decreased from 2.6[%] to 1.65[%].

• Journal of Magnetics
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• v.16 no.3
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• pp.288-293
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• 2011

Generally, the discontinuous armature permanent magnet linear synchronous motor (PM-LSM) is composed by the stator block (accelerator, re-accelerator, and decelerator) and the free running section. However, the stationary discontinuous armature design involves the velocity variation of the mover during drive when the armature's non-installation part changes over to installation part as a result of the outlet edge of the armature. Therefore, we considered deforming the shape of the outlet edge at the armature and apply skew on the permanent magnet by displacing the two magnet segments of each pole. This paper presents the results of a three-dimensional (3-D) numerical analysis with a finite element method (FEM) of the force exerted by the outlet edge.

• Proceedings of the KIEE Conference
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• 2005.04a
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• pp.102-104
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• 2005

This paper deal with the prediction of magnetic field distribution for permanent magnet linear synchronous motor (PMLSM) with infinite operation range. The magnetic field distribution is predicted using a two-dimensional (2-D) analytical solution derived in terms of magnetic vector potential. The slotting and skew is considered using the relative permeance function. The results are validated extensively by finite element (FE) analyses.

• Proceedings of the KIEE Conference
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• 2005.10c
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• pp.132-134
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• 2005

The severe problem in improving the positioning precision of a permanent linear synchronous motor(PMLSM) is the large detent force caused by the PM. It is generally an undesired effect that contributes to the torque ripple, vibration and noise of machine. In this paper, the method to reduce detent force according to the mover skew is studied and analyzed using the analytical method. The analytical results are validated by finite clement analyses.

• Proceedings of the KIEE Conference
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• 2005.07b
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• pp.1156-1158
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• 2005

This paper deals with the prediction of characteristic for permanent magnet linear synchronous motor(PMLSM). The open-circuit field distribution is predicted using a two-dimensional(2-D) analytical solution derivd in terms of magnetic vector potential. The slotting and skew effect is considered using the relative permeance function. and than using this result, flux linkage and back EMF is calculated. The results are validated extensively by finite element(FE) analyses and measurement.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.40 no.7
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• pp.643-655
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• 1991

The analysis method on air gap permeance distribution, air gap MMF distribution, air gap flux density distribution, cogging torque and BEMF about the skewed stator slots or the skewed rotor magnet segments for BLDCM, respectively, is studied as a function of the skew ratio. The proposed method describes the differences between the skewed stator slots and teh skewed rotor magnet segments for the air gap permeance distribution, air gap MMF distribution and air gap flux density distribution. The reliability of the method is also confirmed by the waveform of the cogging torque and BEMF through experiments. And the result shows that the effects on the cogging torque and BEMF due to the skewed stator slots or the skewed rotor magnet segments are the same. In case of the skewed stator slots, the effects of the variations of the winding resistance and inductance are also studied.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.10
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• pp.3633-3640
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• 2010

For a development of non-contact magnet gear which is magnetized as a helical shape, a method of 3-dimensional FEM analysis is used. An elementary technique required for magnetic property analysis and parts design about magnet gear is ensured. In order to test a performance of clean conveyor and turning device which is composed with magnet gear, a clean class 10 environment booth is used for a trial test. It is verified that the magnet conveyor can be acceptable under a condition of clean class 10 by a result of trial test about transfer speed, maximum torque permission, cleanness, maximum transfer weight, existence of hunting and degree of noise.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.1031-1032
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• 2007

In order to reduce the cogging torque, by predicting the variation of the cogging torque according to pole arc/pitch ratio by analytical and FE methods, pole arc/pitch ratio which makes the cogging torque minimum are determined. And then, the measurements of cogging torque for permanent magnet generators with determined pole arc/pitch ratio are presented. The reasons for the error between predicted and measured value are discussed fully in terms of the shape of permanent magnet. Finally, by confirming that predicted results for cogging torque according to pole arc/pitch ratio and skew are shown in good agreement with those obtained from measured one, the validation of analysis results is confirmed.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.752-753
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• 2008

The analytical expressions for magnetic field distributions considering slotting effects, cogging torque and back-emf considering skew effects are established. On the basis of magnetic field solutions, electrical parameters such as back-emf constant and winding inductance are obtained. The predicted results are validated extensively by non-linear finite element (FE) analyses. In particular, test results such as back-emf, cogging torque, inductance and resistance measurements are given to confirm the analyses. Finally, generating performances are investigated by applying estimated parameters to equivalent circuit (EC) of the permanent magnet generator (PMG) and validated extensively by FE calculations and measurements.