A survey on a novel double-rotor spoke-type permanent magnet induction generator employing bridged and bridgeless structures

Derakhshani, Mohammad Mahdi; Ardebili, Mohammad; Jafari, Reza

doi:10.1007/s00202-021-01352-z

Cited by 3 publications

(3 citation statements)

References 26 publications

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“…The LP-MVMs presented in this paper take advantage of the doublesided structure to eliminate the disadvantageous attraction Segmented spoke-type magnets are preferred for the spoketype LPMVM. Hence, the leakage flux can be decreased owing to the eradication of iron bridges [16]. Also, one of the stators is shifted as half of the stator tooth pitch to realize the fluxfocusing effect; consequently, a higher thrust force can be provided for the proposed linear structure.…”

Section: B Configuration Of Linear Pm Vernier Machinesmentioning

confidence: 99%

A High Thrust Force Spoke-Type Linear Permanent Magnet Vernier Machine with Reduced Thrust Force Ripple

Jafari,

Asef,

Ardebili

et al. 2023

2023 International Conference on Smart Energy Systems and Technologies (SEST)

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Linear permanent magnet vernier machines (LP-MVMs) have become prevalent in direct-drive applications, such as wave energy harvesting systems and traction applications, owing to their distinctive merit of providing high thrust force at low speeds. In this paper, a novel structure of a double-sided spoke-type linear PM vernier machine is proposed, which takes advantage of the magnetic gearing effect. The proposed doublesided linear machine exploits spoke-type permanent magnets (PMs) and one of the stators is displaced as half of the stator tooth pitch to obtain the flux-focusing effect. The thrust force ripple of the proposed spoke-type LPMVM can be decreased by adjusting the stator end-teeth and mitigating the detrimental impact of the longitudinal effect, leading to a novel structure of LPMVM, which offers high thrust force density, higher power factor, and lower thrust force ripple. The proposed LPMVM with adjusted end-teeth is a suitable candidate for different direct-drive applications. The presented spoke-type linear PM vernier machine is compared with a conventional surface-mounted LPMVM in order to validate the superiority of the new structure. Also, transient and steady-state thermal analyses of the proposed LPMVM are performed to verify the thermal stability of the new machine. A two-dimensional finite element analysis (2D-FEA) is adopted to confirm the outstanding characteristics of the proposed doublesided spoke-type linear vernier structure.

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Section: B Configuration Of Linear Pm Vernier Machinesmentioning

confidence: 99%

A High Thrust Force Spoke-Type Linear Permanent Magnet Vernier Machine with Reduced Thrust Force Ripple

Jafari,

Asef,

Ardebili

et al. 2023

2023 International Conference on Smart Energy Systems and Technologies (SEST)

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“…Renewable energy resources have gained attraction as substitutes for fossil fuels due to their significant advantages, including being clean and free and having no adverse environmental impacts [1]. Wave energy applications are among the most significant kinds of renewable energy systems that can be exploited to transform wave motions into electrical power [2,3].…”

Section: Introductionmentioning

confidence: 99%

Optimal gear ratio selection of linear primary permanent magnet vernier machines for wave energy applications

Jafari,

Asef,

Sarhadi

et al. 2023

IET Renewable Power Gen

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Linear permanent magnet vernier generators offer a high capability of force density, making them appealing configurations for wave energy harvesting systems. In absolute terms, the performance of these machines is significantly influenced by the selection of slot/pole combinations based on the magnetic gearing effect. For the first time, this paper aims to investigate the impact of different gear ratios on a wide array of linear primary permanent magnet vernier machines (LPPMVMs) with different slot/pole combinations based on fair criteria to offer a more comprehensive understanding of gear ratio selection. To find the optimal number of slots and poles, the response surface methodology is adopted to obtain a robust design and make a fair comparison among LPPMVMs with optimum design characteristics using a cost‐effective approach for the fast and reliable optimisation process. The higher gear ratios result in higher thrust force capability. This will help establishing a new route toward faster develpment of advanced LPPMVMs. The power loss models of LPPMVMs are studied to predict their steady‐state and transient thermal behaviours, verifying their stability and safety, while a simple external forced convection method can be utilised. To verify the model, finite element analysis is exploited to confirm the electromagnetic and thermal analysis results and provide a more exhaustive investigation.

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“…The capacity of ocean wave energy was estimated between 8000 to 80,000 TW•h/yr or 1 to 10 TW, indicating the importance of wave energy conversion technology [13]. However, this technology is moderately immature in comparison with other consequential energy resources, such as wind [14] and solar energy [15,16]. In order to harvest the environmentally friendly wave energy of oceans, wave energy converters (WECs) are employed.…”

Section: Introductionmentioning

confidence: 99%

Linear Permanent Magnet Vernier Generators for Wave Energy Applications: Analysis, Challenges, and Opportunities

et al. 2022

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Harvesting energy from waves as a substantial resource of renewable energy has attracted much attention in recent years. Linear permanent magnet vernier generators (LPMVGs) have been widely adopted in wave energy applications to extract clean energy from oceans. Linear PM vernier machines perform based on the magnetic gearing effect, allowing them to offer high power/force density at low speeds. The outstanding feature of providing high power capability makes linear vernier generators more advantageous compared to linear PM synchronous counterparts used in wave energy conversion systems. Nevertheless, they inherently suffer from a poor power factor arising from their considerable leakage flux. Various structures and methods have been introduced to enhance their performance and improve their low power factor. In this work, a comparative study of different structures, distinguishable concepts, and operation principles of linear PM vernier machines is presented. Furthermore, recent advancements and innovative improvements have been investigated. They are categorized and evaluated to provide a comprehensive insight into the exploitation of linear vernier generators in wave energy extracting systems. Finally, some significant structures of linear PM vernier generators are modeled using two-dimensional finite element analysis (2D-FEA) to compare their electromagnetic characteristics and survey their performance.

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A survey on a novel double-rotor spoke-type permanent magnet induction generator employing bridged and bridgeless structures

Cited by 3 publications

References 26 publications

A High Thrust Force Spoke-Type Linear Permanent Magnet Vernier Machine with Reduced Thrust Force Ripple

A High Thrust Force Spoke-Type Linear Permanent Magnet Vernier Machine with Reduced Thrust Force Ripple

Optimal gear ratio selection of linear primary permanent magnet vernier machines for wave energy applications

Linear Permanent Magnet Vernier Generators for Wave Energy Applications: Analysis, Challenges, and Opportunities

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