Topologies for wound-field three-phase segmented-rotor flux-switching machines

Zulu, Ackim; Mecrow, B.C.; Armstrong, Matthew

doi:10.1049/cp.2010.0090

Cited by 54 publications

(41 citation statements)

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“…The electromagnetic torque, T e , developed in an electrical machine generally consists of a reluctance torque component, T rel , and an excitation torque component, T exc , and may be expressed in a polyphase arrangement as [16]: T…”

Section: Torque Vs Armature Current Density At Maximum Field Currentmentioning

confidence: 99%

A novel wound field flux switching machine with salient pole rotor and nonoverlapping windings

Khan¹,

Sulaiman²,

Ahmad³

2017

Turk J Elec Eng & Comp Sci

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A flux switching machine (FSM) with a segmented rotor and nonoverlapping windings is an attractive alternative for driving high torque density applications. However, a rotor with segments makes the motor less robust as well as difficult to be assembled, while a FSM with salient rotor and overlapping windings inherits high copper losses and less efficiency due to high coil volume. In this paper, a novel structure of FSM with nonoverlapping windings and salient rotor is proposed, making it different from the 10Slot-8Pole segmental and salient rotor FSM. Several design parameters defined in the rotor, armature coil, and field excitation coil are treated by the deterministic optimization approach until the target values are achieved and the performances are analyzed by two-dimensional finite element analysis. The optimized design has achieved average torque of 27.06 Nm and power of 6.83 kW at armature current density, Ja , of 30 A rms /mm 2 and maximum field current density, Je , of 30 A/mm 2 , which is greater than the 10Slot-8Pole segmental rotor and salient rotor FSM. Wound field FSMs with salient rotor and nonoverlapping windings should be considered as promising candidates for hybrid electric vehicles and all-electric boats due to their high torque density, robust rotor, and fewer losses.

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Section: Torque Vs Armature Current Density At Maximum Field Currentmentioning

confidence: 99%

A novel wound field flux switching machine with salient pole rotor and nonoverlapping windings

Khan¹,

Sulaiman²,

Ahmad³

2017

Turk J Elec Eng & Comp Sci

View full text Add to dashboard Cite

show abstract

“…The total flux generation is limited in the stator due to isolation of DC FEC as shown by circle and thus reducing [39]. To improve the drawbacks field excitation SFM, 12S-8P SFWFM with segmental rotor has been designed, as shown in Figure 6 and experimentally tested [31]. Concentrated winding arrangement is used in this design which gives shorter end windings of DC FEC and armature coil when compared with tooth rotor structure with distributed windings.…”

Section: Structure Review Of Sfwfmsmentioning

confidence: 99%

Review of Switched Flux Wound-Field Machines Technology

Khan

Sulaiman

Ahmad

2016

IETE Technical Review

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This paper explains the state of art of switched flux wound-field machines (SFWFMs). The main advantage of these SFWFMs when compared with induction machines, synchronous machines, direct current machines, etc. is that all the active parts such that armature coil and field excitation coil are located on the stator while the rotor part consists of only iron material without windings. This makes the machine more robust, simple structure, and more suitable to be used for high-speed applications, compared to induction machine which has low mechanical strength, less torque desnity, and low power factor. Theories, numerical and technical literature of different SFWFM are described and analysed. Merits and demerits of different SFWFM structure are discussed. This paper categorized SFWFM topologies on the basis of their structure, flux linkage, cogging torque, average torque, and efficiency.

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“…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 converter rating per phase. Figure1 [10] and 2 [12] shows FSMs having segmented-rotor with non-overlap windings and toothed-rotor with overlap windings at the stator.…”

Section: Introductionmentioning

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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Topologies for wound-field three-phase segmented-rotor flux-switching machines

Cited by 54 publications

References 0 publications

A novel wound field flux switching machine with salient pole rotor and nonoverlapping windings

A novel wound field flux switching machine with salient pole rotor and nonoverlapping windings

Review of Switched Flux Wound-Field Machines Technology

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

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