Design and finite element analysis of modular C-Core stator tubular linear oscillating actuator for miniature compressor

Purpose This paper aims to provide an overview of the recent developments and new topologies of single-phase moving magnet linear oscillating actuators (MMLOAs). The key advantage of the MMLOA when compared with conventional LOA is the absence of screws, gears and crankshaft mechanism, which results in fewer mechanical parts, simple structure, easy fabrication, lower noise levels and negligible frictional losses. Design/methodology/approach The review included papers up to August 2021. The structural designs of alternative topologies are deliberated in detail, and their relative merits and demerits are evaluated. Specific design issues, including pole and tooth number combinations, stroke length, magnet pole ratio and split ratio, are investigated. The imperative phenomena of the resonance, as well as the adjustable stroke, are also discussed in detail. Findings The electromagnetic performance in terms of thrust force of selected MMLOA topologies is compared. It is observed that the MMLOA with flux bridge topology has the highest thrust force of 365 N because of the large volume of the permanent magnets (PMs) used, which consequently increased the mass of the mover but based on overall performance analysis, single-phase end ferromagnetic Halbach surface-mounted PM LOA has the highest efficiency around 92%. Originality/value This review provides a comparative analysis for different tubular MMLOA topologies based on design construction and their electromagnetic performances.

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“…For designing C- and E-core stator types, the number of turns N can be calculated using equation (4) (Khalid et al , 2021): …”

Section: Design Issuesmentioning

confidence: 99%

“…A technique is proposed for future work based on a split ratio. The proposed technique is applied to the topology shown in Figure 12 (Khalid et al , 2021). In this procedure, R T is kept constant while the mover radius R M is kept variable.…”

Section: Resonance Operationmentioning

confidence: 99%

Review of moving magnet linear oscillating actuators for linear compressor application

Khalid

Khan

Ullah

et al. 2022

WJE

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“…The mechanical structure of an LOA is composed of two main parts; one is stator and the other is mover. Stator is generally composed of coil and provides controlled magnetic field (Khalid et al , 2021). On the basis of mover configuration, there are three types of LOAs: moving-magnet, moving-coil and moving-iron.…”

Section: Introductionmentioning

confidence: 99%

Performance and design comparison of moving-magnet linear oscillating actuators based on their mover positions

Ahmad

Ullah

et al. 2022

WJE

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Purpose This study aims to investigate and compare the characteristics of three topologies of moving-magnet linear oscillating actuator (LOA) based on their mover position. Positive aspects and consequences of every topology are demonstrated. Three topologies of axially magnetized moving-magnet LOA; outer mover, inner mover (IM) and dual stator (DS) are designed and examined. Due to its characteristically high thrust density and more mechanical strength, axially magnetized tubular permanent magnets (PMs) are used in these topologies. Design/methodology/approach LOAs are designed and optimized using parametric sweep, in term of design parameters and output parameters like thrust force, stroke and operating resonance frequency of the LOA. All the pros and cons of each topology are investigated and compared. Output parameters of the LOAs are compared using same size of the investigated LOAs. Mover mass, which plays a vital role in resonant operation, is analyzed for IM and DS designs. Investigated LOAs are compared with conventional designs of LOA for compressor in refrigeration system with regards of motor constant, stroke and thrust per PM mass. Findings This paper analyzes three topologies of moving-magnet LOAs. The basic difference between investigated LOAs is the radius of tubular-shaped mover from its central axis. All the design parameters are compared and concluded that thrust per PM mass of IMLOA is maximum. OMLOA provides maximum motor constant of value 180 N/A. DSLOA provides thrust force with motor constant 120 N/A and required intermediate materials of PMs. All the three designs give the best results in terms of motor constant and thrust per PM mass, compared to conventional designs of LOA. Originality/value This paper determines the impact of mover position from its central axis in a tubular-shaped moving-magnet LOA. This work is carried out in correspondence of latest papers of LOA.

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“…Mover – moving part of LOA composed of different configuration with regard to active and passive parts. Major configurations of mover used in conventional designs of LOA are moving magnet (MM), moving coil and moving iron (Khalid et al , 2021; Jomde et al , 2018; Bijanzad et al , 2017). MMLOA is superior over others on account of high EM force density, small mover mass and fast response.…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of modular moving magnet linear oscillating actuator for compressor in refrigeration system

Khan

Khan²,

Jawad³

et al. 2022

WJE

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Purpose This paper aims to investigates a novel design of a modular moving magnet linear oscillating actuator (MMM-LOA) with the capability of coupling modules, based on their application and space requirements. Design/methodology/approach Proposed design comprised of modules, and modules are separated by using nonmagnetic materials. Movable part of the proposed design of LOA is composed of permanent magnets (PMs) having axial magnetization direction and tubular structure. Stator of the proposed design is composed of one coil individually in a module. Dimensions of the design parameters are optimized through parametric analysis using COMSOL Multi Physics software. This design is analyzed up to three modules and their response in term of electromagnetic (EM) force and stroke are presented. Influence of adding modules is analyzed for both directions of direct current (DC) and alternating input loadings. Findings Proposed LOA shows linear increase in magnitude of EM force by adding modules. Motor constant of the investigated LOA is 264 N/A and EM force per PM mass is 452.389 N/kg, that shows significant improvement. Moreover, proposed LOA operates in feasible region of stroke for compressor application. Furthermore, this design uses axially magnetized PMs which are low cost and available in compact tubular structure. Originality/value Proposed LOA shows the influence of adding modules and its effect in term of EM force is analyzed for DC and alternating current (AC). Moreover, overall performance and structural topology is compared with state-of-the-art designs of LOA. Improvement with regard of motor constant and EM force per PM mass shows originality and scope of this paper.

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Design and finite element analysis of modular C-Core stator tubular linear oscillating actuator for miniature compressor

Cited by 7 publications

References 22 publications

Review of moving magnet linear oscillating actuators for linear compressor application

Review of moving magnet linear oscillating actuators for linear compressor application

Performance and design comparison of moving-magnet linear oscillating actuators based on their mover positions

Design and analysis of modular moving magnet linear oscillating actuator for compressor in refrigeration system

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