Application of Wedges for the Reduction of the Space and Time-Dependent Harmonic Content in Squirrel-Cage Induction Motors

Abstract

The influence of the semimagnetic stator wedges of different sizes on the electromagnetic characteristics and the behavior of the induction motor is investigated. The study will be carried out with both analytical calculations and FEM analysis. The analytical calculations will take into account the stator and rotor slots, as well as the iron core saturation in order to study the spatial and time-dependent harmonic content of the air-gap magnetic flux density and electromagnetic torque. The size of the wedge plays an important role as it determines the tooth tips saturation, the high harmonic content of the air-gap magnetic flux density, and the electromagnetic characteristics of the induction motor.

AC Distributed Winding with Low Higher Spatial Harmonics Content in Mmf Distribution

“…The reduction of higher harmonics in an electrical machine with distributed windings is carried out by modifying the winding design [14][15][16], using varied slot pitches and different numbers of turns. This paper [17] presents the use of semi-magnetic wedges to close stator slots for the reduction of higher spatial harmonics in the magnetic field in the air gap of an induction motor.…”

A New Stator Slot Design in order to Eliminate Space Harmonics in Induction Motors

“…(Kocabaş ve Mergen 2008) çalışmalarında uzay harmoniklerini azaltmak için asenkron motorun stator oluk yapısında ve kullanılan sargıların yerleşiminde değişiklik yapmışlardır. (Gyftakis et al 2013) 3 fazlı asenkron motorun stator oluk kenarlarının yapısının motor performansına etkilerini sonlu elemanlar yöntemi kullanarak analiz etmişlerdir. Uygun oluk kenarının seçilmesi ile harmonikler içeren hava aralığı manyetik alanın azaltılabileceğini ifade etmişlerdir.…”