Seung-Bin Lim

The Shape Design of Permanent Magnet for Permanent Magnet Synchronous Motor Considering Partial Demagnetization

This paper presents a study on shape design of permanent magnets that is focused on robustness for cogging torque, sinusoidal back emf, and partial demagnetization of the permanent magnet of the outer rotor permanent magnet synchronous motor (PMSM). The simulation method for partial demagnetization is proposed and performed with four kinds of permanent magnet shape models at the fault current and two kinds of load angles corresponding to maximum torque operation and short circuit operation by finite-element method (FEM). The robust shape model of permanent magnets for large-sized hybrid electric vehicles is presented. The characteristics after partial demagnetization are analyzed and compared with experimental results for verification of the partial demagnetization effect

Analysis on the direct-driven high power permanent magnet generator for wind turbine

In this paper, the permanent magnet synchronous generator of 1.5 MW output power which is driven directly without gear system is designed by conventional magnetic equivalent circuit method and analyzed by finite element method for verification of design. We analyzed the characteristics of generator like no load, rated load, short circuit condition and demagnetization of permanent magnet. The last, the analysis results of two kinds of rotor types are compared with each other. Especially the THD (total harmonic distortion) of output voltage is examined for the comparison.

The finite element analysis of switched reluctance motor considering asymmetric bridge converter and DC link voltage ripple

This paper presents a characteristic analysis of switched reluctance motor (SRM) considering hard chopping and dc link voltage ripple by using time-stepped voltage source finite element method in which the magnetic field is combined with drive circuit. We also examine the influence of freewheeling diodes and dc link voltage ripple on the performance of a SRM such as torque ripples and radial force on the surface of the teeth. The freewheeling diodes and dc link voltage ripples must be taken into account in predicting the performance of the SRM.

Analysis of the Torque Characteristics of a Multi-Degrees of Freedom Surface Permanent-Magnet Motor

The multi-degrees of freedom surface permanent-magnet motor (Multi-D.O.F. SPM) has several degrees of freedom operations that are defined as the “roll”, “yaw”, and “pitch”. Normally, the torque that is generated to rotate a rotor includes ripples. The analysis of the torque ripples is important for improving motor performance. In terms of the electric analysis, torque ripple occurs as a result of many factors, including the rotor and stator structures, the distribution of the air-gap flux density, and the waveform of the current in the coils. In particular, the torque ripple is an important factor in the stable operation of the Multi-D.O.F. SPM. Therefore, in this work, the torque ripple was analyzed using various types of magnetization for the permanent magnet. An improved model was proposed for the Multi-D.O.F. SPM based on this analysis.

Characteristic Analysis of Permanent-Magnet-Type Stepping Motor With Claw Poles by Using 3 Dimensional Finite Element Method

This paper analyzed the characteristics of the permanent magnet (PM)-type claw pole stepping motor by using 3D finite element method (FEM). In the case of analyzing this type of motor, 3D FEM is necessary for an accurate analysis due to the magnetizing component of the z-axis direction. As a main design variable, the magnetizing pattern and PM area were selected. The variation of the detent torque and the holding depending on the shape of the pole is also shown. Finally, the results are verified as to compare with the experimental results

Design of rotor slot of single phase induction motor with copper die-cast rotor cage for high efficiency

This paper describes optimal design of rotor slot of single phase induction motor with copper die-cast rotor cage. For high efficiency, we applied die-cast copper rotor cage to single phase induction motor. But increase of efficiency is small and starting torque is reduced largely due to higher conductivity of copper. So, we perform basic design of single phase induction motor. And we study the optimal design of die-cast copper bar of single phase induction motor with respect to starting torque and efficiency. This study is base on the parametric analysis method and the FEA of induction motor.

A study on hysteresis analysis of line start permanent magnet motor using Preisach modeling

In this paper, we analyze the SPLSSM by using FEM combined with Preisach modeling to improve the analysis and design accuracy. From this work, the hysteresis effects on loss and torque performance can be quantitatively evaluated.

Optimal design for cogging torque reduction in BLDC motor using the response surface method

This paper presents a statistical approach to the reduction design for cogging torque in a BLDC motor. In the approach, the finite element method, the numerical optimization technique, and the response surface methodology are effectively introduced. Additionally, the proposed approach provides the effective information to design engineers. Finally, the validity of this paper is verified by test.

A set of experiments to more fully characterize linear PM oscillatory machines

The paper introduces a set of static and dynamic experiments to more fully characterize a linear permanent magnet (PM) oscillatory machine. The proposed set of tests was performed on a PM brushless linear oscillatory machine with surface PM and PM flux concentration movers, respectively. Though the testing arrangement allows for it, temperature, noise and vibration have not been investigated in this paper.

Surface Mounted Permanent Magnet Synchronous Motor Design for Torque Ripple Reduction in EPS

Torque ripple of the motor used in EPS raises vibration problem on steering system. To solve this problem, this paper proposes a optimum design for torque ripple reduction of Surface-mounted Permanent Magnet Synchronous Motor(SPMSM) in EPS. Through analyis back-EMF using Finite element method as changing the shape of permanent magnet and stator shoe, we presented the method of torque ripple redution.