Multi‐dimensional switched reluctance motors for industrial applications

2011 ◽  
Vol 38 (4) ◽  
pp. 419-428
Author(s):  
J.F. Pan ◽  
Norbert Cheung
Keyword(s):  
Performance Prediction ◽  
Low Cost ◽  
Design Procedure ◽  
Experimental Results ◽  
Circuit Board ◽  
Small Scale ◽  
Direct Drive ◽  
Element Analysis ◽  
Content Type ◽  
Switched Reluctance

PurposeThe paper aims to discuss a new direction of design outline of four‐axis machine with multi‐dimensional motors. It proposes an integrated, direct‐drive machine based on switched reluctance (SR) principles. This includes how the machine is constructed and the structure of each axis of motion. The simulation and control results are also provided for performance prediction. The study aims to provide a solution and find applications for high‐performance, low‐cost manufacturing facilities.Design/methodology/approachThe study is based on simulation and experimental results for performance prediction of the multi‐dimensional motors. With the approach of grounded theory on SR machines, design and construction of each axis of motion is verified with finite element analysis. Then, corresponding control strategy is provided for the control of each axis of motion. Some corresponding experimental results are carried out to verify motor performance.FindingsThe paper provides a general design procedure for direct‐drive, integrated, multi‐dimensional SR motors. It suggests a mechanically robust, low‐cost and simple machine structure for potential applications of industrial multi‐axis machines.Research limitations/implicationsConsidering the performance from the prototype, it is expected to find applications in low‐level force and torque output such as automated small‐scale printed circuit board drillings.Practical implicationsOwing to the limitations of the present study, the machine needs further control tests for robust or adaptive applications. Therefore, researchers are encouraged to implement further advanced control strategies on the machine.Originality/valueThe authors attempt to provide a comprehensive solution of multi‐axis machine design based on direct‐drive, low‐cost multi‐dimensional SR motors.

scholarly journals Wind Micro-Turbine Networks for Urban Areas: Optimal Design and Power Scalability of Permanent Magnet Generators

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2759 ◽  
Author(s):  
Marco Palmieri ◽  
Salvatore Bozzella ◽  
Giuseppe Cascella ◽  
Marco Bronzini ◽  
Marco Torresi ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Urban Areas ◽  
Permanent Magnets ◽  
Design Procedure ◽  
Circuit Board ◽  
Small Scale ◽  
Electrical Machine ◽  
Direct Drive ◽  
Original Design ◽  
Power Capability

This work is focused on the design optimization of electrical machines that are used in small-scale direct-drive aerogenerators. A ducted wind turbine, equipped with a diffuser, is considered due to its enhanced power capability with respect to bare turbines. An annular type Permanent Magnet brushless generator is integrated in the turbine structure: the stator coils are placed in the internal part of the diffuser, whereas the permanent magnets are on an external ring connected to the turbine blade tips. Moreover, as regards the stator windings, the Printed Circuit Board (PCB) technology is investigated in order to exploit its advantages with respect to conventional wire coils, such as the increased current density capacity, the reduction of costs, and the enhanced precision and repeatability of the PCBs. An original design procedure is presented together with some scalability rules. An automated tool has been developed in order to aid the electrical machine designer in the first design stages: the tool performs multi-objective optimizations (using the Matlab Genetic Algorithm Toolbox), coupled to fast Finite Element analysis (through the open-source software FEMM) for the evaluation of the electromagnetic torque and field distribution. The proposed procedure is applied to the design of an annular PM generator directly coupled to a small-scale turbine for an urban application.

Analysis of torque ripple and fault-tolerant capability for a 16/10 segmented switched reluctance motor in HEV applications

2019 ◽  
Vol 38 (6) ◽  
pp. 1725-1737
Author(s):  
Xiaodong Sun ◽  
Jiangling Wu ◽  
Shaohua Wang ◽  
Kaikai Diao ◽  
Zebin Yang
Keyword(s):  
Fault Tolerant ◽  
Switched Reluctance Motor ◽  
Torque Ripple ◽  
Experimental Results ◽  
Element Analysis ◽  
Content Type ◽  
Switched Reluctance ◽  
Output Torque ◽  
Reluctance Motor ◽  
Lower Torque

Purpose The torque ripple and fault-tolerant capability are the two main problems for the switched reluctance motors (SRMs) in applications. The purpose of this paper, therefore, is to propose a novel 16/10 segmented SRM (SSRM) to reduce the torque ripple and improve the fault-tolerant capability in this work. Design/methodology/approach The stator of the proposed SSRM is composed of exciting and auxiliary stator poles, while the rotor consists of a series of discrete segments. The fault-tolerant and torque ripple characteristics of the proposed SSRM are studied by the finite element analysis (FEA) method. Meanwhile, the characteristics of the SSRM are compared with those of a conventional SRM with 8/6 stator/rotor poles. Finally, FEA and experimental results are provided to validate the static and dynamic characteristics of the proposed SSRM. Findings It is found that the proposed novel 16/10 SSRM for the application in the belt-driven starter generator (BSG) possesses these functions: less mutual inductance and high fault-tolerant capability. It is also found that the proposed SSRM provides lower torque ripple and higher output torque. Finally, the experimental results validate that the proposed SSRM runs with lower torque ripple, better output torque and fault-tolerant characteristics, making it an ideal candidate for the BSG and similar systems. Originality/value This paper presents the analysis of torque ripple and fault-tolerant capability for a 16/10 segmented switched reluctance motor in hybrid electric vehicles. Using FEA simulation and building a test bench to verify the proposed SSRM’s superiority in both torque ripple and fault-tolerant capability.

Influence of fiber stacking sequences and matrix materials on mechanical and vibration behavior of jute/carbon hybrid composites

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Sathiyamoorthy Margabandu ◽  
Senthil Kumar Subramaniam
Keyword(s):  
Tensile Strength ◽  
Hybrid Composites ◽  
Low Cost ◽  
Laminated Composite ◽  
Experimental Results ◽  
Element Analysis ◽  
Content Type ◽  
Vibration Behavior ◽  
Damping Behavior ◽  
Composite Models

Purpose The study aims to investigate the influence of fabric hybridization, stacking sequences and matrix materials on the tensile strength and damping behavior of jute/carbon reinforced hybrid composites. Design/methodology/approach The hybrid composites were fabricated with different sequences of fabric plies in epoxy and polyester matrix using a hand layup technique. The tensile and vibration characteristics were evaluated on the hybrid laminated composite models using finite element analysis (FEA), and the results were validated experimentally according to ASTM standards. The surface morphology of the fractured specimens was studied using the scanning electron microscope. Findings The experimental results revealed that the position of jute layers in the hybrid composites has a significant influence on the tensile strength and damping behavior. The hybrid composite with jute fiber at the surface sides and carbon fibers at the middle exhibited higher tensile strength with superior damping properties. Further, it is found that the experimental results are in good coherence with the FEA results. Originality/value The less weight and low-cost hybrid composites were fabricated by incorporating the jute and carbon fabrics in interply configurations. The influences of fabric hybridization, stacking arrangements and matrix materials on the tensile and vibration behavior of jute/carbon hybrid composites have been numerically evaluated and the results were experimentally validated.

Social media: a blessing or a curse? Voice of owners in the beauty and wellness industry

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Kulvinder Kaur ◽  
Pawan Kumar
Keyword(s):  
Social Media ◽  
Low Cost ◽  
Growth Potential ◽  
Social Media Marketing ◽  
Small Scale ◽  
Content Type ◽  
Social Media Platforms ◽  
Pros And Cons ◽  
Marketing Tool ◽  
Use Of Internet

PurposeThe rise in the use of Internet technologies and social media has shifted the marketing practices from offline to online. This study aims to determine the pros and cons of social media marketing in the beauty and wellness industry.Design/methodology/approachIn-depth interviews were conducted with the owners and marketing executives of beauty and wellness centers to understand the use of popular social media platforms in this industry and their pros and cons.FindingsThe researchers identified eight merits and seven demerits of social media in the beauty and wellness industry. Every respondent is happy and satisfied with social media use, particularly Instagram and Facebook. Irrespective of the demerits, they have shown the intention to increase its usage in the future. The merits override demerits; thus, social media is a blessing for this industry from the owners' perspective.Research limitations/implicationsThe research is exploratory and is confined to just one industry. Research implication is that the visual nature of social media makes it a powerful tool for the promotion of the beauty and wellness industry.Practical implicationsThe study's findings will be beneficial for small-scale businesses as it will push them to take advantage of this low-cost marketing tool.Social implicationsSocial media marketing is helpful for communication and marketing purposes for society.Originality/valueThe beauty and wellness industry remained unfocused by researchers because it is highly unorganized, fragmented and not regulated, yet has huge growth potential. This research will provide a closer look at this industry as well as social media marketing.

Analytical sub-domain model for predicting open-circuit field of permanent magnet vernier machine accounting for tooth tips

2016 ◽  
Vol 35 (2) ◽  
pp. 624-640 ◽  
Author(s):  
Y. Oner ◽  
Z.Q. Zhu ◽  
L.J. Wu ◽  
X. Ge
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Open Circuit ◽  
Air Gap ◽  
Domain Model ◽  
Direct Drive ◽  
Element Analysis ◽  
Cogging Torque ◽  
Content Type ◽  
Flux Modulation

Purpose – Due to high electromagnetic torque at low speed, vernier machines are suitable for direct-drive applications such as electric vehicles and wind power generators. The purpose of this paper is to present an exact sub-domain model for analytically predicting the open-circuit magnetic field of permanent magnet vernier machine (PMVM) including tooth tips. The entire field domain is divided into five regions, viz. magnets, air gap, slot openings, slots, and flux-modulation pole slots (FMPs). The model accounts for the influence of interaction between PMs, FMPs and slots, and radial/parallel magnetization. Design/methodology/approach – Magnetic field distributions for slot and air-gap, flux linkage, back-EMF and cogging torque waveforms are obtained from the analytical method and validated by finite element analysis (FEA). Findings – It is found that the developed sub-domain model including tooth tips is very accurate and is applicable to PMVM having any combination of slots/FMPs/PMs. Originality/value – The main contributions include: accurate sub-domain model for PMVM is proposed for open-circuit including tooth-tip which cannot be accounted for in literature; the model accounts the interaction between flux modulation pole (FMP) and slot; developed sub-domain model is accurate and applicable to any slot/FMP/PM combinations; and it has investigated the influence of FMP/slot opening width/height on cogging torque.

Investigation of performance of small wind turbine blades with winglets

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Michal Kulak ◽  
Michal Lipian ◽  
Karol Zawadzki
Keyword(s):  
Wind Turbine ◽  
Low Cost ◽  
Turbine Blades ◽  
Significant Degree ◽  
Small Scale ◽  
Performance Study ◽  
Wind Turbine Blades ◽  
Content Type ◽  
Efficiency Increase ◽  
Energy Prosumers

Purpose This paper aims to discuss the results of the performance study of wind turbine blades equipped with winglets. An investigation focusses on small wind turbines (SWTs), where the winglets are recalled as one of the most promising concepts in terms of turbine efficiency increase. Design/methodology/approach To investigate a contribution of winglets to SWT aerodynamic efficiency, a wind tunnel experiment was performed at Lodz University of Technology. In parallel, computational fluid dynamics (CFD) simulations campaign was conducted with the ANSYS CFX software to investigate appearing flow structures in greater detail. Findings The research indicates the potential behind the application of winglets in low Reynolds flow conditions, while the CFD study enables the identification of crucial regions influencing the flow structure in the most significant degree. Research limitations/implications As the global effect on a whole rotor is a result of a small-scale geometrical feature, it is important to localise unveiled phenomena and the mechanisms behind their generation. Practical implications Even the slightest efficiency improvement in a distributed generation installation can promote such a solution amongst energy prosumers and increase their independence from limited natural resources. Originality/value The winglet-equipped blades of SWTs provide an opportunity to increase the device performance with relatively low cost and ease of implementation.

scholarly journals Design of a Novel Modular Axial-Flux Double Rotor Switched Reluctance Drive

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1161 ◽  
Author(s):  
Pere Andrada ◽  
Balduí Blanqué ◽  
Eusebi Martínez ◽  
José Ignacio Perat ◽  
José Antonio Sánchez ◽  
...  
Keyword(s):  
Design Procedure ◽  
Experimental Measurements ◽  
Axial Flux ◽  
Element Analysis ◽  
Switched Reluctance ◽  
Flux Reversal ◽  
Switched Reluctance Machines ◽  
Output Torque ◽  
Rotor Poles ◽  
New Distribution

Nowadays, there is a renewed interest in switched reluctance machines and especially in axial-flux switched reluctance machines (AFSRM). This paper presents a comprehensive design procedure for modular AFSRM with an inner stator and two exterior rotors that have a new distribution of the stator and rotor poles, resulting in short magnetic paths with no flux reversal. After a description of the proposed machine, the output torque equation is derived from a simplified non-linear energy conversion loop and guidelines for its design are given. Once the preliminary sizing has been carried out the different modules of the AFSRM, the magnetically active parts made with SMC, are reshaped or refined using 3D printing and 3D electromagnetic finite element analysis until they reach their definitive shape and dimensions. Finally, an AFSRM has been built following the proposed design procedure and has been validated by experimental measurements.

Novel linear switched-flux PM machine with 9/10 primary/secondary pole number combination

2015 ◽  
Vol 34 (6) ◽  
pp. 1656-1672 ◽  
Author(s):  
Qinfen Lu ◽  
Yanxin Li ◽  
Yunyue Ye ◽  
J.T. Chen ◽  
Z.Q. Zhu
Keyword(s):  
Permanent Magnet ◽  
Thrust Force ◽  
Load Condition ◽  
Design Parameters ◽  
Force Density ◽  
Direct Drive ◽  
Low Thrust ◽  
Element Analysis ◽  
Content Type ◽  
Force Ripple

Purpose – Due to linear structure, linear switched flux permanent magnet machines (LSFPMMs) also may have odd pole primary, such as 9, 15, 21, etc., without unbalanced magnetic force in equivalent rotary machines. The paper aims to discuss these issues. Design/methodology/approach – In order to increase the thrust force density, the influence of some major design parameters, including split ratio, PM thickness, primary slot width and secondary pole width, are investigated by finite element analysis. For reducing the thrust force ripple under on-load condition, the end auxiliary teeth are adopted and their positions are also optimized. Findings – This novel 9/10 primary/secondary poles LSFPMM has high average thrust force and low thrust force ripple by optimization. The results demonstrate that the odd pole primary may be a good candidate for long-stroke linear direct drive application. Originality/value – A novel 9/10 primary/secondary poles linear switched flux permanent magnet machine is developed in this paper. The similar conclusions could be obtained for other LSFPMMs with odd pole primary.

Design and realization of a novel magnetic nutation drive for industry robotic wrist reducer

2017 ◽  
Vol 44 (1) ◽  
pp. 58-63 ◽  
Author(s):  
Ding-jian Huang ◽  
Li-gang Yao ◽  
Wen-jian Li ◽  
Jun Zhang
Keyword(s):  
Low Cost ◽  
Three Dimensional ◽  
Transmission Ratio ◽  
Drive Mode ◽  
Element Analysis ◽  
Compact Structure ◽  
Content Type ◽  
Contact Transmission ◽  
Three Dimensional Finite Element ◽  
Robotic Wrist

Purpose The purpose of this research is to achieve a novel magnetic nutation drive for an industry robotic wrist reducer. Design/methodology/approach A novel magnetic nutation drive is proposed, and the structure and principle of the designed magnetic nutation drive are described in this study. Three-dimensional finite element analysis is used to compute the magnetic and torque of the magnetic nutation drive. Furthermore, a prototype of this novel magnetic nutation drive device is developed with 3D printing technology and tested to verify the feasibility of the proposed structure and principle. Findings The simulation and experimental results indicated that the proposed magnetic nutation drive device could meet the desired specifications, and that this novel magnetic nutation drive device successfully realized the non-contact transmission ratio of 105:1 required for a robotic wrist reducer. Practical implications This novel magnetic nutation drive is low-cost and easy to make and use, and which provides the non-contact transmission ratio of 105:1 required for a robotic wrist reducer. Originality/value For the first time, this research applies the permanent magnet drive technology to nutation drive and puts forward a new non-contact nutation drive mode. The novel drive mode can solve some problems of the traditional mechanical contact nutation drive, such as vibration, friction loss, mechanical fatigue and necessity of lubrication. The proposed non-contact nutation drive device can achieve a high reduction ratio with compact structure and can be suitable for industry application.

Quality changes in fresh rohu (Labeo rohita) cutlets added with fibers from ragi, oat and jowar

2016 ◽  
Vol 46 (4) ◽  
pp. 571-582 ◽  
Author(s):  
Gurnoor Kaur Lubana ◽  
Baljot Kaur Randhawa ◽  
Vijay Kumar Reddy Surasani ◽  
Ajeet Singh
Keyword(s):  
Low Cost ◽  
Nutritional Composition ◽  
The Body ◽  
Rich Source ◽  
Market Potential ◽  
Small Scale ◽  
Fish Products ◽  
Content Type ◽  
Overall Acceptability ◽  
Cooking Properties

Purpose This study aims to develop fiber-enriched cutlets from minced meat of rohu and study the effects of fiber inclusion on composition, cooking properties and acceptability of cutlets. Design/methodology/approach Cutlet mix prepared using rohu mince was divided into four lots, out of which three lots were enriched with fibers from ragi (RFC), jowar (JFC) and oat (OFC) at 10 per cent over and above its quantity. Prepared cutlets were analyzed for nutritional composition, texture, cooking properties and sensorial quality. Findings Moisture, protein, fat, fiber and ash contents (per cent) of the fiber-enriched cutlets ranged between 40.4-42.0, 24.5-25.5, 13.2-14.7, 1.8-2.0 and 2.4-2.5 per cent, respectively. The addition of fibers increased the cooking yield of cutlets from 84.6 to 87.5 per cent. RFC lot cutlets had the lowest whiteness values and the highest hardness and shear force values. Cutlets from all the lots had an overall acceptability scores more than 7.0, indicating the sensorial acceptability. Although the differences were insignificant, cutlets from the RFC lot were less acceptable, which might be because of the dark color and tough texture. Hence, jowar and oat flour at 10 per cent can be used to enrich rohu cutlets without affecting their sensorial acceptability. Research limitations/implications Sources of fiber will be the major limitation in the work, as the fiber inclusion may negatively affect the quality and acceptability of cutlets. Time of cooking will also influence the final product characteristics, which need to be standardized. Practical implications Fish is a rich source of protein but lacks fiber, which is essential for body metabolism. Grains are rich source of fibers but lack some essential nutrients required by the body. In India, many people are dependent on fish for protein due to its high nutritious value. So enriching fish meat with fiber sources will address the health-related problems associated with low-fiber diets. The methodology developed in this work can be used to fulfill the demand for balanced and nutritious diet. Because of increasing health awareness, fish products with added fiber will also increase its market potential. Social implications The methodology developed can be used by small-scale entrepreneurs to earn more income by developing functional fish products with low-cost ingredients. The developed products will not only address the issues related to the consumption of low-fiber diets but also create a market for fish products because of their health-benefiting effects. Originality/value The work is completely original in nature. The results reported are unique and the outcome of the research has social applicability.

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