Performance Analysis of a Modular E-Shaped Stator Hybrid Excited Flux Switching Motor With Flux Gaps

Abstract

This paper proposes a new modular hybrid excited flux switching motor (MHEFSM) with flux gaps, adding the fault-tolerant capability to the proposed motor. The proposed motor uses an E-Shaped stator, as the middle teeth of E-core produce fault-tolerant capability, and in C-core, this capability is eradicated. The no-load flux linkage is calculated by the magnetic network model (MNM) to reduce time and disk storage. The drawback of the constant flux linkage of PM motors is overcome by employing field excitation (FE). The FE helps in regulation flux at higher speeds. The motor leading geometry variables are optimized by using Genetic Global Optimization (GGO). The GGO helped in refining the structure of the motor and has improved the flux linkage by 68.18%, average torque and torque density by 62.35% each, reduced torque ripples by 20.62%, and cogging torque by 18.52%. The volume of permanent magnet (PM) in the proposed MHEFSM is reduced by 36.24%, and 48.49% higher average torque and torque density is obtained compared to the state of art motor proposed in the literature. Furthermore, a 3D analysis of the proposed MHEFSM is done to further evaluate the electromagnetic performance.INDEX TERMS Finite element analysis, flux gaps, modular stator, variable flux machine, genetic optimization.

Design and Experimental Validation of a New Outer Rotor Double PM Excited Flux Switching Generator for Direct Drive Wind Turbines

“…In [12], the neodymium PMs were sandwiched on the stator teeth. In contrast, two different inner rotor FSPM machines were presented in [13] and [14]. In [13], the stator core was divided into segments, and the neodymium PMs were positioned inside the stator teeth; in [14], the neodymium PMs were situated between the stator teeth.…”

“…In contrast, two different inner rotor FSPM machines were presented in [13] and [14]. In [13], the stator core was divided into segments, and the neodymium PMs were positioned inside the stator teeth; in [14], the neodymium PMs were situated between the stator teeth. Furthermore, the inner rotor FSPM machine was discussed in [15] and [16], incorporating neodymium PMs placed in both the radial and circumferential directions within the stator core.…”

“…Furthermore, the inner rotor FSPM machine was discussed in [15] and [16], incorporating neodymium PMs placed in both the radial and circumferential directions within the stator core. In this regard, one of the challenges that may be encountered with conventional FSPM machines, such as the outer rotor FSPM machines that have been discussed in [11] and [12], or such as the inner rotor FSPM machines that have been reported in [13] to [16], is the demagnetization of PMs. This is because the PMs are located in the stator core, which has a higher temperature compared to the rotor core.…”