• Proceedings of the KIEE Conference
• /
• 2007.04c
• /
• pp.56-58
• /
• 2007

This paper deals with analytical prediction for the cogging torque of permanent magnet machines with multi-pole rotor First. open-circuit field solutions are derived using a magnetic vector potential and a two-dimensional (2-d) polar coordinate systems. On the basis of derived open-circuit field solutions and 2-d permeance functions. we also derive the analytical solutions for the open-circuit field considering stator slotting effects and cogging torque. All analytical results are shown in goof agreement with those obtained from finite element (FE) analyses.

• Proceedings of the KIEE Conference
• /
• 2007.04c
• /
• pp.59-61
• /
• 2007

This paper presents the characteristic analysis of the 40-kVA high speed synchronous generator considering the field current. The generator consist of the rotor with the short-circuited field coils connected armature coils of exciter and the stator with three-phase winding. To analyze the characteristics of the generator, the direct finite element method is applied.

• Proceedings of the KIEE Conference
• /
• 2007.10c
• /
• pp.47-49
• /
• 2007

This paper deals with the generating characteristic analysis of permanent magnet (PM) machines with multi-pole rotor and 3-phase stator windings considering losses such as copper loss, iron loss and mechanical loss. First, using d-q transformation, dynamic equations of PM machines are established. And then, characteristic equations for losses, power and efficiency are also derived. On the basis of d-q dynamic equations and characteristic equations, dynamic simulation algorithm is achieved by the MATLAB/SIMULINK. The simulation results are validated extensively by finite element (FE) analyses.

• Proceedings of the KIEE Conference
• /
• 2007.10c
• /
• pp.115-117
• /
• 2007

Core loss form a larger proportion of the total losses. This paper deals with the analysis on the core loss in PM generator considering the operating speed for wind power application. Using the data information from a manufacturer and nonlinear curve fitting, this paper investigates the magnetic behavior and its core losses in the stator core using the electrical steels.

• Proceedings of the KIEE Conference
• /
• 2008.07a
• /
• pp.719-720
• /
• 2008

This paper deals with analytical approach for rotor loss prediction of permanent magnet synchronous generator(PMSG). The rotor losses of synchronous generator are induced by the magnets. Since stator of our model is skewed, slotting effect can be negligible for our PM wind turbine generator. In order to calculate eddy current, this paper derives analytical solutions by the magnetic vector potential. Finally this paper compared analytical result with eddy current density obtained from finite element(FE) calculations using phase current harmonics analysis.

• Proceedings of the KIEE Conference
• /
• 2008.07a
• /
• pp.721-722
• /
• 2008

This paper deals with comparison and analysis for rotor losses of permanent magnet synchronous generator using phase current harmonic analysis according to dc and ac load. On the basis of analytical field analysis, the rotor losses are analysed. Particularly, rated speed and ac load and the rated speed and dc load conditions are considered. This paper compared rotor losses considered dc load with rotor losses considered ac load. Although our analytical modes is low speed, the rotor losses must be considered by results.

• Proceedings of the KIEE Conference
• /
• 2008.07a
• /
• pp.729-730
• /
• 2008

Recently, contactless power transfer system is widely used in many industry applications such as automated guided vehicles and medical applications. In this paper, we derived electrical parameters and analyzed output characteristics of contactless power transfer device with resonant converter for levitation / propulsion system. And, the characteristics analysis results are satisfied with output required specifications of analysis model.

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

• Proceedings of the KIEE Conference
• /
• 2008.10c
• /
• pp.50-52
• /
• 2008

This paper deals with design and characteristics analysis of 600HP class high_speed Permanent synchronous motor. The field equations due to magnet and stator windings are established in terms of vector potential and 2-d polar coordinate system. Back-emf and torque are then derived. The results compared with finite element method and show in good conformity with those obtained from finite element method.

• Proceedings of the KIEE Conference
• /
• 2008.10c
• /
• pp.53-55
• /
• 2008

In high speed applications, the slotless permanent magnet(PM) motors appear an attractive solution, being almost insensitive to magneto-motive force harmonics and to pulse width modulation(PWM) current ripple and exhibiting lower stator iron losses and rotor losses (significant with square wave current control). So, this paper deals with methods for design of permanent magnet synchronous motor/generator.