Enhancing Capabilities of Double Sided Linear Flux Switching Permanent Magnet Machines

Ullah, Noman; Basit, Abdul; Khan, Faisal; Ullah, Wasiq; Shahzad, Mohsin; Zahid, Atif

doi:10.3390/en11102781

Cited by 12 publications

(5 citation statements)

References 33 publications

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“…They are also capable of achieving higher thrust densities than LIMs [53], [59], while lowering thermal management requirements on their secondary side [48], [49]. Even so, their thrust capability is still lower than the one from LPMSMs [51], [65], [127].…”

Section: Linear Switched Reluctance Machinesmentioning

confidence: 99%

“…There are four main types of LPPMs currently in the literature. These machines are Linear Switched-Flux Permanent Magnet Machines (LSFPMs) [3], [5], [22], [26], [74], [94]- [127], [139], Linear Flux-Reversal Permanent Magnet Machines (LFRPMs) [128]- [144], Linear Doubly-Salient Permanent Magnet Machines (LDSPMs) [145], [146] and Linear Vernier Permanent Magnet Machines (LVPMs) [147]- [176]. Their structural advantage over conventional LPMSMs, i.e., the absence of PMs in the secondary, has brought a huge amount of research involving these LPPMs.…”

Section: Linear Primary Permanent Magnet Machinesmentioning

confidence: 99%

“…Moreover, due to the modular structure, the primary of LSFPMs tends to be mechanically weak [102], and their detent and thrust ripple performance is quite sensitive to manufacturing tolerances [102]. In fact, both the no load and on load ripples of LSFPMs are generally quite high [3], [26], [98], [113], [127]. Another drawback of LSFPMs is the amount of PM material that they require per unit of thrust [74], [103], [104], [106].…”

Section: Switched-flux Machinesmentioning

confidence: 99%

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Linear Machines for Long Stroke Applications—A Review

et al. 2020

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This document reviews the current state of the art in the linear machine technology. First, the recent advancements in linear induction, switched reluctance and permanent magnet machines are presented. The ladder slit secondary configuration is identified as an interesting configuration for linear induction machines. In the case of switched reluctance machines, the mutually-coupled configuration has been found to equate the thrust capability of conventional permanent magnet machines. The capabilities of the so called linear primary permanent magnet, viz. switched-flux, flux-reversal, doubly-salient and vernier machines are presented afterwards. A guide of different options to enhance several characteristics of linear machines is also listed. A qualitative comparison of the capabilities of linear primary permanent magnet machines is given later, where linear vernier and switched-flux machines are identified as the most interesting configurations for long stroke applications. In order to demonstrate the validity of the presented comparison, three machines are selected from the literature, and their capabilities are compared under the same conditions to a conventional linear permanent magnet machine. It is found that the flux-reversal machines suffer from a very poor power factor, whereas the thrust capability of both vernier and switched-flux machines is confirmed. However, the overload capability of these machines is found to be substantially lower than the one from the conventional machine. Finally, some different research topics are identified and suggested for each type of machine.

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Section: Linear Switched Reluctance Machinesmentioning

confidence: 99%

Section: Linear Primary Permanent Magnet Machinesmentioning

confidence: 99%

Section: Switched-flux Machinesmentioning

confidence: 99%

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Linear Machines for Long Stroke Applications—A Review

et al. 2020

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“…For this reason, research on the application of HTS field coils to electrical rotating machines with a stationary field coil structure has been active. In particular, the FSM with stationary HTS field coils is becoming more attractive, given its advantages of a robust rotor and a reliable machine structure [32][33][34][35][36][37][38]. Various researchers have attempted to apply HTS coils to electrical machines, such as motors and generators [26][27][28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

A Flux-Controllable NI HTS Flux-Switching Machine for Electric Vehicle Applications

2020

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This paper deals with a flux-controllable NI HTS flux-switching machine (FSM) for electric vehicle (EV) applications. In a variable-speed rotating machine for EVs, such as electric buses, electric aircraft and electric ships, an electric motor capable of regulating the flux offers the advantage of constant output operation. In general, conventional HTS rotating machines have excellent flux-regulation performance, because they excite an HTS field coil. However, it is difficult to ensure any flux-regulation capabilities in HTS rotating machines using HTS field coils that apply the no-insulation (NI) winding technique, due to the inherent charge and discharge delays in these machines. Nevertheless, the NI winding technique is being actively researched as a key technology for the successful development of HTS rotating machines, because it can dramatically improve the operational stability of HTS field coils. Therefore, research to implement an HTS rotating machine with flux-regulation capabilities, while improving the operating stability of the HTS field coil using the NI winding technique, is required for EV applications. In this paper, we propose an HTS rotating machine with a flux switching structure, a type of topology of a rotating machine that is being actively studied for application to the electric motors used in EVs. The proposed HTS flux-switching machine (FSM) uses NI field coils, but additional field windings are applied for flux regulation, which enables flux control. In this study, an NI HTS field coil was also fabricated and tested because the characteristic resistance value should be used for the design and characteristic analyses of machines which utilize an NI coil. The simulation model used to analyze the flux-regulation performance capabilities of the NI HTS FSM were devised based on the characteristic resistance values obtained from a charging test of the fabricated NI HTS field coil. This study can provide a good reference for further research, including work on the manufacturing of a prototype NI HTS FSM for EV applications, and it can be used as a reference for the development of other HTS rotating machines, such as those used in large-scale wind power generation, where flux-regulation capabilities are required.

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“…Double‐sided LPMFSMs can be categorised as; (a) dual‐stator LPMFSMs (DSLPMFSMs) and (b) dual‐mover LPMFSMs (DMLPMFSMs). Both of these topologies have their own merits and de‐merits, such as DSLPMFSM has a merit of low flux leakage [14] and a demerit of high thrust force ripples. DMLPMFSM suffers with a drawback of low flux linkage with advantage of low thrust force ripples and detent force values.…”

Section: Introductionmentioning

confidence: 99%

Performance comparison and optimisation of dual mover linear permanent magnet flux switching machine

Ullah

Khan

Basit

et al. 2019

IET Electric Power Applications

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Short moving primary and rigid low-cost secondary are important requirements of linear machines designed for long stroke applications. In the race, linear permanent magnet flux switching machine (LPMFSM) is a competitive candidate by confining excitation sources to short mover, thus making stator robust and low cost (made of only iron). However, single-sided LPMFSM exhibit a demerit of high normal (attraction) force due to its topology. In order to rectify the problem and enhance thrust force profile, two novel double-sided LPMFSMs are proposed with dual stator and dual mover topologies. After stator pole study, both topologies with same design dimensions are analysed and compared by 2-D finite element method here. Detailed analysis revealed that 12/14 DMLPMFSM exhibit low numerical values of thrust force ripples and detent force while maintaining average thrust force value. Hence, 12/14 DMLPMFSM is selected and optimised by structure-based deterministic optimisation (SBDO) approach to further enhance thrust force profile. Finally, comparison of initial and optimised design of 12/14 DMLPMFSM is presented to validate optimisation procedure.

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Enhancing Capabilities of Double Sided Linear Flux Switching Permanent Magnet Machines

Cited by 12 publications

References 33 publications

Linear Machines for Long Stroke Applications—A Review

Linear Machines for Long Stroke Applications—A Review

A Flux-Controllable NI HTS Flux-Switching Machine for Electric Vehicle Applications

Performance comparison and optimisation of dual mover linear permanent magnet flux switching machine

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