Radial Force Characteristic Assessment in a Novel Two-Phase Dual Layer SRG Using Fem

Abstract

Abstract-This paper investigates the radial force characteristics of a novel two-phase dual layer switched reluctance generator. The proposed generator consists of two magnetically dependent stator and rotor layers, where each stator set includes four salient poles with windings wrapped around them while, the rotor comprises of two salient poles. In this paper, the radial and tangential force components and their trends in healthy condition under different load levels are assessed with the respect to critical rotor positions. One of the most important problems seen in the industrial applications of generators which have concerned users is the rotor eccentricity which may conclude the unbalanced distribution of flux linkage as well as acoustic noise and vibration due to the radial forces produced during the rotation of machine's rotor. In this regard, in this paper, it is attempted to obtain and evaluate the radial force components resulted from different degrees of eccentricity faults.

Electromagnetic Design and Fem Analysis of a Novel Dual-Air-Gap Reluctance Machine

“…Therefore, the flux linked is given by Equation (12). Figure 4 shows the magnetic circuit for a typical double-rotor structure and the magnetic circuit (the net air-gap length is still maintained).…”

“…The electro-magnetic design and analysis of double-rotor flux modulated permanent magnet machines is put forward in [11]. The dual-layer rotor reluctance generator is presented in [12] using finite element analysis. The double-rotor structure with independent operation of the two rotors using simulation is presented in [13].…”

Electromagnetic Analysis of Different Geometry of Transmitting Coils for Wireless Power Transmission Applications

“…This method approaches the problem by reducing errors [18]. FEM is used in different researches for various purposes such as modeling and parameter identification [19][20][21][22][23][24][25]. An acceptable solution from Maxwells equations for most practical cases is neither possible nor accurate.…”

Reduction of Eddy Current Loss of Permanent-Magnet Machines With Fractional Slot Concentrated Windings

“…However, by using the improved 18-teeth/10-poles winding in Figure 8(b), the 1st sub-harmonic component is suppressed, hence limiting the flux density to flow around one-half of the machine. Then, by using the air-gap flux density components, the magnetic radial forces can be calculated according to the Maxwell's stress method [10],…”

“…For PM machines, only the specific magnetomotive force (MMF) winding harmonic for the armature field interacts with the PM field to produce continuous torque. The others are undesirable and will degrade machine performance, such as localized core saturation, eddy current loss in PMs [7,8], additional core losses in rotor and stator, and noise and vibration [9,10], which are the main disadvantages of the FSCW types. These harmonics cause flux variation in the air-gap.…”