Research on yokeless double-sided multi-tooth flux-switching linear motor

Abstract

Users who downloaded this article also downloaded: (2016),"Special issue on recent advances in electrical machines", COMPEL -The international journal for computation and mathematics in electrical and electronic engineering, Vol. 35 Iss 2 pp. -http:// dx.(2016),"Modeling and simulation analysis of the hybrid excitation synchronous machine system utilizing tooth harmonic for excitation", COMPEL -The international journal for computation and mathematics in electrical and electronic engineering, Vol. 35 Iss 2 pp. 540-555 http:// dx.(2016),"Investigation of modular odd-pole PM linear synchronous motors with flux gaps", COMPEL -The international journal for computation and mathematics in electrical and electronic engineering, Vol. 35 Iss 2 pp. 424-438 http://dx.If you would like to write for this, or any other Emerald publication, then please use our Emerald for Authors service information about how to choose which publication to write for and submission guidelines are available for all. Please visit www.emeraldinsight.com/authors for more information. About Emerald www.emeraldinsight.comEmerald is a global publisher linking research and practice to the benefit of society. The company manages a portfolio of more than 290 journals and over 2,350 books and book series volumes, as Downloaded by University College London At 11:22 28 June 2016 (PT)well as providing an extensive range of online products and additional customer resources and services.Emerald is both COUNTER 4 and TRANSFER compliant. The organization is a partner of the Committee on Publication Ethics (COPE) and also works with Portico and the LOCKSS initiative for digital archive preservation. AbstractPurpose -Due to the advantages of direct driven, high thrust density, and high efficiency, flux-switching linear motor (FSLM) is required for many applications, including aerospace and automotive. However, the vibration caused by detent force and difficulties in the assembly produced by the large normal force become the barriers that restrict its development. The paper aims to discuss these issues. Design/methodology/approach -In order to improve the electromagnetic performance of double-sided multi-tooth FSLM (DMTFSLM), a yokeless DMTFSLM with moving primary is proposed and compared with normal DMTFSLM. Moreover, with theoretical analysis, the selection principle of slot-pole number combination is obtained. DMTFSLMs with four slot/pole combinations, 6s/16p, 6s/17p, 6s/19p, 6s/20p, are analyzed based on finite element analysis model. Finally, several parameters of this yokeless DMTFSLM have been optimized to obtain the better performance. Findings -In yokeless DMTFSLM, it is found that the asymmetry of Back-EMF caused by the end-effect is eliminated, which leads to a better thrust force performance in comparison with the normal structure. The small attractive force between the secondary and the primary makes it easier for assembly and also can reduce the friction, which is more suitable for high-speed application. In addition, the best slot-pole combination rul...

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

“…Reason behind increase in detent force is uplifting of thrust force profile. Thrust force ripple ratio is reduced due to closer range of thrust force profile peaks and high value of average thrust force, as presented in (3). Average thrust force and thrust force ripples of both machines at different current densities are also compared and concluded that average thrust force and thrust force ripples of initial model almost linearly grow with increase in current density.…”

“…This unique feature enables salient, robust, and low-cost stator [2]. LPMFSM topology attracted attention of numerous researchers around the globe due to additional advantages of bipolar flux linkage, good thermal dissipation as PMs are confined to short mover, armature field and PM field are in parallel, high reliability, fault tolerant due to low mutual inductances, high thrust force/power density, good dynamic response, and sinusoidal back-EMF [3][4][5][6][7][8].…”

“…This drawback increases friction force and exerts additional unbalanced forces on bearings and allied facility, hence reducing overall machine efficiency [5,9]. Whereas double-sided LPMFSMs has zero average normal force over one electrical period [3,5]. Other advantages of double-sided LPMFSM are almost double thrust force density when compared with singlesided LPMFSM, high power factor, good overload capability, offer reduced thrust force ripples by adjusting armature windings' current of the two sides, and linearity even under high excitation sources [10][11][12][13].…”

Enhancing Capabilities of Double Sided Linear Flux Switching Permanent Magnet Machines

“…Comparison of double stator and double mover LFSM is performed in [24] and the authors claim an advantage of a low thrust force ratio for the DSLFSM structure with moving primary (mover). Analysis and design of a LFSPMM with a yokeless double stator conventional topology is presented in [25,26] and one with multitooth topology is presented in [27,28]. On the other hand, the multi-tooth configuration would result in more severe magnetic leakage on the mover pole, which could easily saturate the mover iron teeth even with a light electric load.…”

A Novel Axial Flux Magnetically Geared Machine for Power Split Application

“…In this paper, a new 3-phase AFMGPM machine for power split application is proposed, of which the basic concept is presented in [18] and [19]. The topology is a combination of a high performance yokeless and segmented armature machine, as presented in [20], [21], and an axial MG, which shares the machine stator as modulation ring. It should be noted that the distinct feature of the proposed machine is that the fractional slot concentrated winding is utilised to amplify the torque of both PM rotors with different pole-pair numbers.…”