A novel magnetic harmonic gear

Rens, Johan; Atallah, K.; Calverley, S.D.; Howe, D.

doi:10.1109/iemdc.2007.382752

Cited by 39 publications

(36 citation statements)

References 2 publications

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“…Magnetic gears have been explored more in recent years with the advent of rare-earth permanent magnets. Gears studied in [4][5][6][7] range from concentric planetary gears to newer more exotic versions such as the cycloid and harmonic gear. The torque densities for the gears studied and built range from 72 Nm/l for early prototypes all the way to 185 Nm/l for the latest prototypes, compared with 30 Nm/l for liquid-cooled electric machines.…”

Section: Introductionmentioning

confidence: 99%

Gearing ratios of a magnetic gear for marine applications

Frank

Toliyat

2009

2009 IEEE Electric Ship Technologies Symposium

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Marine propulsion systems have become increasingly electromechanical in recent years. Proposed systems show increasing torque density in an effort to reduce volume and weight. A magnetic gear is proposed to reduce the size of the propulsion motor and achieve similar torque amplification provided by a mechanical gearbox, without the maintenance and breakdown issues. A magnetic gearbox, of the concentric planetary type, will be studied for the high-torque low-speed requirements of a marine propulsion system. Torque ripple is investigated across multiple models to determine acceptable torque transfer performance.

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Section: Introductionmentioning

confidence: 99%

Gearing ratios of a magnetic gear for marine applications

Frank

Toliyat

2009

2009 IEEE Electric Ship Technologies Symposium

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“…It was first proposed in [20], while its fundamental theory was clearly explained and demonstrated in [21]. The operation of a magnetic harmonic gear relies on a mechanism to produce time-varying, sinusoidal variation of the air-gap between a flexible low-speed PM rotor and a rigid PM stator [21], [22]. The distinct advantages associated with harmonic MGs are high gear ratios, high torque density and smooth torque transmission [23].…”

Section: A Torque Dense Magnetic Gear Topologiesmentioning

confidence: 99%

“…The practical implementation of a harmonic MG is complicated by the need for a flexible PM low-speed rotor. Alternative configurations were proposed such as the use of a rigid and eccentrically rotating low-speed rotor [24], and a dual stage arrangement [21], [23]. However, the structural complexity of this type of MG remains a deterrent to further exploitation of this topology.…”

Section: A Torque Dense Magnetic Gear Topologiesmentioning

confidence: 99%

“…The harmonic magnetic gears share a similar operating principle as that of the mechanical harmonic gears. It was first proposed in [20], while its fundamental theory was clearly explained and demonstrated in [21]. The operation of a magnetic harmonic gear relies on a mechanism to produce time-varying, sinusoidal variation of the air-gap between a flexible low-speed PM rotor and a rigid PM stator [21], [22].…”

Section: A Torque Dense Magnetic Gear Topologiesmentioning

confidence: 99%

“…The distinct advantages associated with harmonic MGs are high gear ratios, high torque density and smooth torque transmission [23]. The gear ratio of a harmonic magnetic gear is given as [21]:…”

Section: A Torque Dense Magnetic Gear Topologiesmentioning

confidence: 99%

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Magnetic gear technologies: A review

Tlali

Wang

Gerber

2014

2014 International Conference on Electrical Machines (ICEM)

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This paper reviews the historic and current development of magnetic gear technologies. There has been considerable amount of research and development activities on magnetic gear technologies in recent years. However, it is still not clear if this technology is ready for potential industry applications. The purpose of this paper is to summarize the historic and current development work of magnetic gear technologies in an attempt to give readers some insight into the advantages and disadvantages, challenges, opportunities and technology readiness.

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Design and analysis of a two‐stage transmission magnetic‐geared machine

Jin

Zhang

2019

IEEJ Transactions Elec Engng

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The purpose of this paper is to realize a two-stage transmission magnetic-geared (2-STMG) machine with high gear ratio. The proposed machine contains a concentric magnetic gear (CMG) and a Vernier machine (VM). Both the components meet the magnetic gearing effect and share a common high-speed rotor (HSR). The VM is the first stage, and the CMG is the second stage. The designed gear ratio of the proposed 2-STMG is 34. The magnetic flux is partially coupled to the HSR yoke. The cogging torque on the HSR is slightly higher than that on the low-speed rotor (LSR). A method is presented to detect the gear ratio of magnetic geared machines with the back-electromotive force (back-EMF). And the evaluated gear ratio of the prototype is found to be close to the design value. The amplitude of the fundamental back-EMF is nearly linear with the LSR speed, and the slope of the fitting curve is ∼0.16 V/rpm. The peak static torques on both rotors are positively correlated with the DC currents applied to windings but limited by saturation when current is larger than 4A. The 2-STMG machine is controllable, and the speed ratio of HSR to LSR is close to the gear ratio of the outer CMG.

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A novel magnetic harmonic gear

Cited by 39 publications

References 2 publications

Gearing ratios of a magnetic gear for marine applications

Gearing ratios of a magnetic gear for marine applications

Magnetic gear technologies: A review

Design and analysis of a two‐stage transmission magnetic‐geared machine

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