Design and parametric analysis of axial flux PM motors with minimized cogging torque

Jong Hyun Choi, Jung Hoon Kim, Dong Ho Kim, Yoon Su Baek

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

This paper deals with analysis and experiment of an axial flux permanent magnet (AFPM) brushless direct current (BLDC) motor with minimized cogging torque. Recently, many optimal designs for the AFPM motor have been done by finite-element (FE) analysis, but such analysis generally is time-consuming. In this study, the equation of magnetic flux lines existing between PMs and cores is assumed mathematically and the minimum cogging torque is calculated theoretically and geometrically without FE analysis. The form of equation is assumed to be a second-order polynomial in this paper. The skew angle that makes the cogging torque minimized is calculated theoretically, and the value of minimum cogging torque is confirmed by FE analyses and experiments. In the theoretical analysis, the maximum cogging torque of a proposed AFPM motor has the smallest value approximately at a skew angle of 4° and that value is about the same as those of FE analyses and experiments. Compared with the nonskewed motor, the cogging torque of the skewed motor can be decreased to over 90%, which has a value of 5% of the rated torque. Two types of stator cores, with the skew angle of 0° (nonskewed) and 4° (skewed optimally), are analyzed, manufactured, and tested experimentally in this paper.

Original languageEnglish
Article number4957798
Pages (from-to)2855-2858
Number of pages4
JournalIEEE Transactions on Magnetics
Volume45
Issue number6
DOIs
Publication statusPublished - 2009 Jun 1

Fingerprint

Torque
Fluxes
Permanent magnets
Finite element method
Experiments
Magnetic flux
Stators
Polynomials

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

Cite this

@article{1d1e143ad0cb47bebe2513b967d7f5d7,
title = "Design and parametric analysis of axial flux PM motors with minimized cogging torque",
abstract = "This paper deals with analysis and experiment of an axial flux permanent magnet (AFPM) brushless direct current (BLDC) motor with minimized cogging torque. Recently, many optimal designs for the AFPM motor have been done by finite-element (FE) analysis, but such analysis generally is time-consuming. In this study, the equation of magnetic flux lines existing between PMs and cores is assumed mathematically and the minimum cogging torque is calculated theoretically and geometrically without FE analysis. The form of equation is assumed to be a second-order polynomial in this paper. The skew angle that makes the cogging torque minimized is calculated theoretically, and the value of minimum cogging torque is confirmed by FE analyses and experiments. In the theoretical analysis, the maximum cogging torque of a proposed AFPM motor has the smallest value approximately at a skew angle of 4° and that value is about the same as those of FE analyses and experiments. Compared with the nonskewed motor, the cogging torque of the skewed motor can be decreased to over 90{\%}, which has a value of 5{\%} of the rated torque. Two types of stator cores, with the skew angle of 0° (nonskewed) and 4° (skewed optimally), are analyzed, manufactured, and tested experimentally in this paper.",
author = "Choi, {Jong Hyun} and Kim, {Jung Hoon} and Kim, {Dong Ho} and Baek, {Yoon Su}",
year = "2009",
month = "6",
day = "1",
doi = "10.1109/TMAG.2009.2018696",
language = "English",
volume = "45",
pages = "2855--2858",
journal = "IEEE Transactions on Magnetics",
issn = "0018-9464",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "6",

}

Design and parametric analysis of axial flux PM motors with minimized cogging torque. / Choi, Jong Hyun; Kim, Jung Hoon; Kim, Dong Ho; Baek, Yoon Su.

In: IEEE Transactions on Magnetics, Vol. 45, No. 6, 4957798, 01.06.2009, p. 2855-2858.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Design and parametric analysis of axial flux PM motors with minimized cogging torque

AU - Choi, Jong Hyun

AU - Kim, Jung Hoon

AU - Kim, Dong Ho

AU - Baek, Yoon Su

PY - 2009/6/1

Y1 - 2009/6/1

N2 - This paper deals with analysis and experiment of an axial flux permanent magnet (AFPM) brushless direct current (BLDC) motor with minimized cogging torque. Recently, many optimal designs for the AFPM motor have been done by finite-element (FE) analysis, but such analysis generally is time-consuming. In this study, the equation of magnetic flux lines existing between PMs and cores is assumed mathematically and the minimum cogging torque is calculated theoretically and geometrically without FE analysis. The form of equation is assumed to be a second-order polynomial in this paper. The skew angle that makes the cogging torque minimized is calculated theoretically, and the value of minimum cogging torque is confirmed by FE analyses and experiments. In the theoretical analysis, the maximum cogging torque of a proposed AFPM motor has the smallest value approximately at a skew angle of 4° and that value is about the same as those of FE analyses and experiments. Compared with the nonskewed motor, the cogging torque of the skewed motor can be decreased to over 90%, which has a value of 5% of the rated torque. Two types of stator cores, with the skew angle of 0° (nonskewed) and 4° (skewed optimally), are analyzed, manufactured, and tested experimentally in this paper.

AB - This paper deals with analysis and experiment of an axial flux permanent magnet (AFPM) brushless direct current (BLDC) motor with minimized cogging torque. Recently, many optimal designs for the AFPM motor have been done by finite-element (FE) analysis, but such analysis generally is time-consuming. In this study, the equation of magnetic flux lines existing between PMs and cores is assumed mathematically and the minimum cogging torque is calculated theoretically and geometrically without FE analysis. The form of equation is assumed to be a second-order polynomial in this paper. The skew angle that makes the cogging torque minimized is calculated theoretically, and the value of minimum cogging torque is confirmed by FE analyses and experiments. In the theoretical analysis, the maximum cogging torque of a proposed AFPM motor has the smallest value approximately at a skew angle of 4° and that value is about the same as those of FE analyses and experiments. Compared with the nonskewed motor, the cogging torque of the skewed motor can be decreased to over 90%, which has a value of 5% of the rated torque. Two types of stator cores, with the skew angle of 0° (nonskewed) and 4° (skewed optimally), are analyzed, manufactured, and tested experimentally in this paper.

UR - http://www.scopus.com/inward/record.url?scp=66549110519&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=66549110519&partnerID=8YFLogxK

U2 - 10.1109/TMAG.2009.2018696

DO - 10.1109/TMAG.2009.2018696

M3 - Article

VL - 45

SP - 2855

EP - 2858

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

SN - 0018-9464

IS - 6

M1 - 4957798

ER -