The theory of the inductor alternator

Walker, J.H.

doi:10.1049/ji-1.1942.0099

Cited by 26 publications

(7 citation statements)

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“…Besides, FEFSMs have the advantage of cost-saving materials as the PM on stator used in PMFSMs is replaced by excitation from DC coils. In addition, the FEFSM machine with salient rotor is a standards combination of SRM and inductor generator technology [5], [6]. The motor's reliability also has been verified in variety of applications requiring high power and high torque density [7]- [9].…”

Section: Introductionmentioning

confidence: 99%

Preliminary Design Analysis of a New Field Excitation Flux Switching Machine with Segmental Rotor and Non-overlap Winding

Omar¹,

Sulaiman²,

Soomro³

et al. 2018

IJET

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Recently, a three-phase Field Excitation Flux Switching Motor (FEFSM) with salient rotor structure has been introduced with their advantages of easy rotor temperature elimination and controllable FEC magnetic flux particularly meet for high torque, high power as well as high speed diverse performances. Nevertheless, the salient rotor structure is found to lead a longer magnetic flux path between stator and rotor producing weak flux linkage along with low torque performances. Therefore, a new structure of a single-phase FEFSM using segmental rotor with non-overlap windings is proposed. Segmental rotor and non-overlap windings are the clear advantages of these topologies as the copper losses gets reduce and rotor becomes less weight as well as more robust. Detailed analysis on winding arrangement test analysis, armature and FEC flux linkage, back-EMF and average torque characteristics have been performed by using 2D Finite Element Analysis (FEA) through JMAG version 15 software. The results show that the proposed motor with segmental rotor and non-overlap windings produce short flux path, high flux linkage and the highest torque capability achieved is 0.91 Nm.

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Section: Introductionmentioning

confidence: 99%

Preliminary Design Analysis of a New Field Excitation Flux Switching Machine with Segmental Rotor and Non-overlap Winding

Omar¹,

Sulaiman²,

Soomro³

et al. 2018

IJET

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

“…Furthermore, to manufacture the FEFSM motors, the PM on the stator of conventional PMFSMs is replaced by DC field excitation coil. In other words, the FEFSM motors having salient-rotor structure is a novel topology, merging the principles of the SRMs and inductor generator [7][8].The performance of FSM is enhanced by using segmental rotor configuration in recent research [9]. Segmental rotor is designed in a manner such that to achieve bipolar flux in armature winding, which has neither magnets nor winding.…”

mentioning

confidence: 99%

Design and Analysis of Wound Field Three-Phase Flux Switching Machine with Non-overlap Windings and Salient Rotor

Khan¹,

Sulaiman²,

Ahmad³

et al. 2015

ijeei

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Topologies for three-phase salient rotor flux-switching machines having non-overlap armature and field windings are presented. Salient rotor is used to modulate and switch the polarity of the flux linkage in the armature winding and this phenomenon represents the basic principle of operation of these types of machines. Non-overlap windings and toothed-rotor are the clear advantages of these topologies as the copper losses gets reduce and rotor becomes more robust. Finite Element Analysis (FEA) is used to examine the three phase topology of proposed Wound-field flux switching motor (WFFSM) with non-overlap windings and salient rotor. Coil test analysis, peak armature flux linkage, cogging torque, induced emf and average torque are examined. On the basis of these analyses, it is confirmed that 24S-10P has high flux linkage, less cogging torque and high average torque as compared to other WFFSMs.Keywords: Wound-field flux switching motor (WFFSM), topology, salient rotor, non-overlap windings IntroductionIn the mid 1950s, the first concept of flux switching machine (FSM) has been founded and printed. 4 stator slots and 4 rotor poles (4S-4P) permanent magnet FSM i.e. permanent magnet single-phase limited angle actuator or more well-known as Laws relay has been developed [1], and then single phase generator with 4 stator slots, and 4or 6 rotor poles (4S-4/6P) has been invented [2].Over the last decade, many FSM topologies have been introduced for various application i.e. automotive, domestic appliances, aerospace etc. FSM can be classified into three groups that are permanent magnet (PM) FSM, Field Excitation (FE) FSM and Hybrid Excitation (HE) FSM. PM and field winding are the main sources of flux in PMFSM and FEFSM while in HEFSM, both field winding and permanent magnet produces the flux [3][4][5][6]. In all these FSMs, the armature winding and field winding or PMare located on the stator. When compare with other FSMs, the FEFSM motor has advantages of low cost, simple construction, magnet-less machine, and variable flux control capabilities suitable for various performances. Furthermore, to manufacture the FEFSM motors, the PM on the stator of conventional PMFSMs is replaced by DC field excitation coil. In other words, the FEFSM motors having salient-rotor structure is a novel topology, merging the principles of the SRMs and inductor generator [7][8].The performance of FSM is enhanced by using segmental rotor configuration in recent research [9]. Segmental rotor is designed in a manner such that to achieve bipolar flux in armature winding, which has neither magnets nor winding. To produce bipolar flux linkages in this way, a toothed-rotor structure may be used but it requires overlap windings on the stator [10]. Non-overlap windings have been used in [11] to increase the efficiency by reducing the copper losses and enhanced the speed torque characteristics of FSM.A three-phase FSM using a segmental rotor has been proposed in [12] to improve fault tolerance to a reduction in torque pulsations and power con...

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“…In addition, to manufacture the FEFSM, the PM is replaced by DC FE coil on the stator of conventional PMFSMs. In other words, FEFSM with salient rotor structure is a novel topology, merging the principles of the inductor generator and the switch reluctance machines SRMs [5][6].…”

Section: Introductionmentioning

confidence: 99%

Comparative Performance of FE-FSM, PM-FSM and HE-FSM with Segmental Rotor

Soomro

Sulaiman

Khan

2015

AMM

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Abstract. Flux switching machines (FSMs), new type of electric machines with unique operating principles have been introduced and published recently. FSMs contain armature and excitation sources on the stator with robust rotor structure. According to rotor structure FSMs can be classified into two types namely salient pole rotor and segmental pole rotor. Various topologies have been studied and published using both rotor structures, however salient pole rotor has a demerit of less torque generation due to longer flux path resulting flux leakage surrounding the rotor. In this paper a new structure of hybrid excitation FSM (HEFSM) with segmental rotor is proposed and a comparative analysis with the invented field excitation FSM (FEFSM) and permanent magnet FSM (PMFSM) is presented. Initially, coil arrangement tests are examined to confirm the operating principle of HEFSM with segmental rotor. Moreover, the cogging torque, induced voltage, magnetic flux, torque at various armature current densities and power characteristics are observed based on 2D-finite element analysis (FEA).

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The theory of the inductor alternator

Cited by 26 publications

References 0 publications

Preliminary Design Analysis of a New Field Excitation Flux Switching Machine with Segmental Rotor and Non-overlap Winding

Preliminary Design Analysis of a New Field Excitation Flux Switching Machine with Segmental Rotor and Non-overlap Winding

Design and Analysis of Wound Field Three-Phase Flux Switching Machine with Non-overlap Windings and Salient Rotor

Comparative Performance of FE-FSM, PM-FSM and HE-FSM with Segmental Rotor

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