Analysis and design of a coreless permanent-magnet machine considering the winding shape by using a lumped equivalent magnetic circuit model

¹ Korea Electronics Technology Institute, 420-140 Gyeonggi, Korea
² Department of Electrical and Computer Engineering, Seoul National University, 151-742 Seoul, Korea
³ Creative Research Engineer Development, Brain Korea 21 Plus, Seoul National University, 151-742 Seoul, Korea

^a e-mail: jongsukro@naver.com

Received: 28 August 2013
Revised: 12 February 2014
Accepted: 3 April 2014
Published online: 5 June 2014

Abstract

A simple and rapid analysis and design method is proposed for a coreless permanent magnet machine (CPMM) using a hexagonal winding (HW). The HW, which combines a rectangular winding (RTW) and rhombic winding (RBW), can compensate for the disadvantages and maximize the advantages of the RTW and RBW. The CPMM is typically analyzed using complex differential equations or a timeconsuming finite element analysis (FEA). To address this problem, a relatively simpler and less timeconsuming analysis method is proposed by using a lumped equivalent magnetic circuit (LEMC) model. Furthermore, an effect of winding angle on a motor performance is analyzed via precise inspection of the relationship between the variables of the HW and the characteristics of motor. The validity and usefulness of the proposed method are verified via FEA and experiment.