Modular Rotor Single Phase Field Excited Flux Switching Machine with Non-Overlapped Windings

Abstract

This paper aims to propose and compare three new structures of single-phase field excited flux switching machine for pedestal fan application. Conventional six-slot/three-pole salient rotor design has better performance in terms of torque, whilst also having a higher back-EMF and unbalanced electromagnetic forces. Due to the alignment position of the rotor pole with stator teeth, the salient rotor design could not generate torque (called dead zone torque). A new structure having sub-part rotor design has the capability to eliminate dead zone torque. Both the conventional eight-slot/four-pole sub-part rotor design and six-slot/three-pole salient rotor design have an overlapped winding arrangement between armature coil and field excitation coil that depicts high copper losses as well as results in increased size of motor. Additionally, a field excited flux switching machine with a salient structure of the rotor has high flux strength in the stator-core that has considerable impact on high iron losses. Therefore, a novel topology in terms of modular rotor of single-phase field excited flux switching machine with eight-slot/six-pole configuration is proposed, which enable non-overlap arrangement between armature coil and FEC winding that facilitates reduction in the copper losses. The proposed modular rotor design acquires reduced iron losses as well as reduced active rotor mass comparatively to conventional rotor design. It is very persuasive to analyze the range of speed for these rotors to avoid cracks and deformation, the maximum tensile strength (can be measured with principal stress in research) of the rotor analysis is conducted using JMAG. A deterministic optimization technique is implemented to enhance the electromagnetic performance of eight-slot/six-pole modular rotor design. The electromagnetic performance of the conventional sub-part rotor design, doubly salient rotor design, and proposed novel-modular rotor design is analyzed by 3D-finite element analysis (3D-FEA), including flux linkage, flux distribution, flux strength, back-EMF, cogging torque, torque characteristics, iron losses, and efficiency.

Design and Thermal Analysis of Linear Hybrid Excited Flux Switching Machine Using Ferrite Magnets

“…The average thrust force for 6/5 is higher than 6/7, so it is considered for further analysis. The velocity of the machine is dependent on the input source frequency and pole pitch of the machine and can be found by using Equation (2) [22].…”

Design of 6 slots/10 poles modular rotor sandwich switched flux switching permanent magnet motor

“…Each stator pole in that has a PM component. However, the reduced winding space still has an impact on torque density [10,11].…”

Design and lumped parameter magnetic network model of hybrid excited consequent pole flux switching machine

“…Stator wound field flux switching machines (WFFSM) are considered a promising candidate because of their robust rotor structure, good thermal management, less potential demagnetization and elimination of brushes and slip rings (Tang et al , 2012; Aoyama et al , 2018). However, they possess an extensive downside of low torque density with weak flux linkage (Ur Rahman et al , 2019).…”