AUTHOR : Hae-Joong Kim, Do-Jin Kim, Jung-Pyo Hong
ORGANIZATION : Compumag 2013
JOURNAL : Compumag 2013
YEAR : 2013.7
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ISSUE :
PAGE : ~
Three-phase fractional slot concentrated winding synchronous machines (FCSM) has excellent electrical properties of high torque density, low cogging torque and torque ripple, yet in armature, as vibration / noise characteristics are not good due to asymmetric magnetomotive force (MMF), and due to the presence of sub-space harmonics in MMF, eddy current loss of permanent magnet is increased. . If Multiple-layer winding with optimum turns ratio is applied to three-phase FCSM, this can improve these problems. In this paper, the turns ratio in concentrated multiple-layer winding machine is proposed to be applied. Taken the turns ratio into consideration, a general formula is derived in order to calculate the winding factor. Using the induced formula, the winding factor
changes according to changes in the turns ratio is calculated, and the turns ratio to remove the harmonic components that the MMF has is determined. To verify improvement in the motor characteristics for the proposed method, turns ratio is applied to motors of 16pole 18slot and 10pole 12slot. For the two models, MMF distribution in the air-gap using Finite Elements Method (FEM) is
calculated, and through harmonic analysis, reduction or removal of a particular harmonic is verified. In addition, through FEM transient analysis, reduced eddy current loss in permanent magnet is to be identified, and improvements in vibration / noise are to be verified by deformation / acoustic noise analysis of stator.