Soon-O Kwon

Performance comparison of IPMSM with distributed and concentrated windings

Performance comparison of IPMSMs with distributed and concentrated windings is presented in this paper. Two IPMSMs have been designed with identical rotor dimensions, air gap length, series turn number, stator outer radius, and axial length except winding configuration. Basic parameters and output characteristics, such as inductances, resistances, back emf, output torque, and efficiency, are compared. Design strategy about winding configuration is discussed

Characteristic analysis of the slotless axial-flux type brushless DC motors using image method

The analytical method of images using magnetic charge is applied to analyze characteristics of the slotless axial-flux type brushless dc motors in this paper. The theory of analytical method is introduced and flux density distribution is calculated and verified by three-dimensional finite element analysis. Then, characteristics between single and dual gap axial-flux motor are analyzed and compared

Experimental Estimation of Inductance for Interior Permanent Magnet Synchronous Machine Considering Temperature Distribution

This paper quantitatively analyzes inductance estimation errors due to temperature variation and proposes accurate experimental estimation methods considering the temperature distribution of an interior permanent magnet synchronous machine (IPMSM). Accurate knowledge of direct and quadrature-axis inductances is essential for high-performance control of an IPMSM. From the quantitative error analysis results, it is shown that the temperature variation is a very sensitive factor for the accuracy of the experimental estimation of the inductances. For accurate temperature consideration, two experimental estimation approaches are proposed. One uses the temperature measured at end windings to represent the internal temperature of the machine. The other uses both the measured temperature and other temperature information obtained from a temperature distribution analysis. This paper carries out a case study in which the proposed estimation methods are applied to a sample IPMSM with ferrite magnets. Experimental results are compared with finite element analysis (FEA) results in order to verify the effectiveness of the proposed methods.

Conformal transformation technique for prediction of the magnetic field distribution in an IPM motor

An analytical method used to predict the magnetic field in an interior permanent magnet (IPM) motor, is developed and validated in this paper. By using space harmonic analysis and conformal transformation (or conformal mapping (CM)) techniques, the air-gap magnetic field distribution, with considering of stator slots effect and rotor saliency effect, is precisely calculated. The accuracy of this analytical method is confirmed by the 2-dimensional finite element analysis (FEA). The analytical method can produces results much faster than FEA alone

Practical analysis method for claw-pole type generator using 2-dimensional equivalent model

The design of 2-dimensional equivalent model for claw-pole type generator is presented in this paper. On the basis of 3D geometry, 2D equivalent model is designed and 2D FEA is performed. Comparing to other analysis method for claw-pole type machine, such as 3D FEA and MEC, presented method can be more practically used and directly applied to industry. Flux distribution in the air-gap and flux density at rotor and stator are verified by 3D FEA, and no-load back EMFs for field input voltages are verified by measurement

One-Ampere Conductor Method for Tubular Linear Induction Motor for Size Reduction of Primary Iron Core

This paper presents size reduction of primary iron core for tubular linear induction motor by improved winding configuration. Using one-ampere conductor method, magnetic field analysis of tubular linear induction motor for size reduction is conducted. Size reduction and improvement of air gap flux distribution is achieved by improved winding configuration, and analysis results are verified by finite element analysis (FEA) and experiments.

The Comparison Study of Distributed and Concentrated Winding Types in Interior Permanent Magnet Motor for Integrated Starter Generator

In this paper, distributed and concentrated winding type interior permanent magnet synchronous machines are designed and compared to use for an integrated starter generator. The characteristics are computed from equivalent circuit which consists of parameters obtained from finite element analysis. The comparison results are discussed, and the determined model is fabricated and tested

Conformal Mapping technique for magnetic saliency analysis of Double-layer Interior Permanent Magnet Motor

In this paper, an analytical method based on conformal mapping technique is applied to the rotor design of interior permanent magnet synchronous motor (IPMSM). A single layer IPMSM is developed to a double-layer IPMSM to improve saliency ratio with design of experiment (DOE) and response surface methodology (RSM). The increased reluctance torque of the double-layer IPMSM is verified by finite element analysis (FEA). With this analytical method, the estimation of saliency effect related to reluctance torque can be achieved by simple calculation of equations. Therefore, time and effort in the initial design of the model having complex geometry can be saved