A multielement magnetic gear

Hesmondhalgh, D.E.; Tipping, D.

doi:10.1049/ip-b.1980.0017

Cited by 39 publications

(22 citation statements)

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“…Therefore, they have low vibration and acoustic noise, easy maintenance, and no lubricant against conventional mechanical gears. Various types of magnetic gears have been introduced in previous papers (1)- (3) . Among them, a planetary type magnetic gear (4) has attracted interest recently.…”

Section: Introductionmentioning

confidence: 99%

Experimental Tests and Efficiency Improvement of Surface Permanent Magnet Magnetic Gear

2014

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Magnetic gears offer several advantages against conventional mechanical gears such as easy maintenance, low vibration and acoustic noise, and high reliability. For the practical application of magnetic gears, experimental studies on gear characteristics that consider real manufacturing constraints should be performed. This paper presents the loss analysis, experimental tests, and performance improvement of a surface permanent magnet (SPM) magnetic gear. The torque characteristic and the efficiency of the SPM magnetic gear were calculated using finite element analysis (FEA). Experiments were performed on a trial magnetic gear. The FEA and experimental results demonstrated the improved efficiency of the trial gear. The maximum efficiency of the improved gear was over 96%.

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Section: Introductionmentioning

confidence: 99%

Experimental Tests and Efficiency Improvement of Surface Permanent Magnet Magnetic Gear

2014

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“…In 1980, a multielement MG which employed the variable reluctance principle to transmit torque was proposed [1]. However, it not only has low torque density and complexity, but also suffers from low efficiency due to the excitation loss, core loss and brush friction.…”

Section: Converted Magnetic Gearsmentioning

confidence: 99%

“…In contrast, the magnetic gear (MG) offers significant advantages of reduced acoustic noise, minimum vibration, free from maintenance, improved reliability, inherent overload protection, and physical isolation between the input and output shafts. However, for a long time, MGs have received relatively little attention, probably due to the poor torque density and relative complexity of the magnetic circuits [1,2].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Magnetic-Geared Permanent-Magnet Machines

Li¹,

Chau²,

Cheng³

et al. 2013

PIER

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Abstract-With the advent of magnetic gears, researchers have developed a new breed of permanent-magnet machines. These magnetic-geared permanent-magnet machines artfully incorporate the concept of magnetic gearing into the permanent-magnet machines, leading to achieve low-speed high-torque direct-drive operation. In this paper, a quantitative comparison of three viable magnetic-geared permanent-magnet machines is firstly performed, hence revealing their key features, merits, demerits and applications.Initially, the development of the magnetic gears, including the converted topologies and field-modulated topologies, is reviewed. Then, three viable magnetic-geared permanent-magnet machines are identified and discussed. Consequently, the corresponding performances are analyzed and quantitatively compared. The results and discussions form an important foundation for research in low-speed high-torque direct-drive systems.

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“…Magnetic gears are an alternative technology which may offer significant advantages, such as, reduced maintenance and improved reliability, inherent overload protection, and physical isolation between input and output shafts. However, despite these advantages magnetic gearing has received relatively little attention to date, probably because of the relative complexity and poor torque density of the magnetic circuits which have been proposed [1,2]. Therefore, for applications in which mechanical gearing cannot be accommodated, direct electrical drives are employed.…”

Section: Introductionmentioning

confidence: 99%