A Review on Magnetic Gears: Topologies, Computational Models and Design Aspects

Wang, Yawei; Filippini, Mattia; Alotto, Piergiorgio

doi:10.1109/icelmach.2018.8507204

Cited by 12 publications

(9 citation statements)

References 66 publications

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“…This is mainly due to the flux concentration effect (two PM poles pushing flux in the same direction) through the steel segments between circumferentially magnetized PMs as shown in Figure 4. Moreover, experimental validation results presented in literature demonstrate a spoke PM FM-MG prototype with the highest torque density among other rotor designs [4][5][6]14]. Consequently, both LPR and HPR are configured with a spoke PM design.…”

Section: Baseline Design Materials and Specificationsmentioning

confidence: 88%

“…In order to introduce the reader to the MGs topologies, MGs can mainly be classified into two categories provided in Figure 1. The first category is the one that is mainly derived from mechanical gearboxes, which will not be considered in this paper due to its poor torque density [3][4][5][6]. On the other hand, the second category relies on the FM concept and will be considered extensively in this paper.…”

Section: Literature Review On Flux Modulation Magnetic Gearsmentioning

confidence: 99%

“…It should be noted that it is often the case that one particular issue can be "resolved", but at the expense of making another issue appear or get much worse. For example, [14] demonstrates a FM-MG prototype with the highest torque density reported in literature so far [4][5][6]. However, the rotor tip speed is limited by the segmented structure beside the low gear ratio 1:4.25.…”

Section: Challenges Of Magntic Gears and Magnetically Geard Machinesmentioning

confidence: 99%

See 2 more Smart Citations

Magnetic Gears and Magnetically Geared Machines with Reduced Rare-Earth Elements for Vehicle Applications

Al-Qarni

El-Refaie

2021

WEVJ

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This paper covers a new emerging class of electrical machines, namely, Magnetic Gears (MGs) and Magnetically Geared Machines (MGMs). This particular kind of gears/machines is capable of either scaling up or down the revolutions-per-minute to meet various load profiles as in the case of mechanical gearboxes, but with physical isolation between the rotating components. This physical isolation between the rotational components leads to several advantages in favor of MGs and MGMs over mechanical gearboxes. Although MGs and MGMs can potentially provide a solution for some of the practical issues of mechanical gears, MGs and MGMs have two major challenges that researchers have been trying to address. Those challenges are the high usage of rare-earth Permanent Magnet (PM) materials and the relatively complex mechanical structure of MGs and MGMs, both of which are a consequence of the multi-airgap design. This paper presents designs that reduce the PM rare-earth content for Electric Vehicles (EVs). Additionally, the paper will ensure having practical designs that do not run the risk of permanent demagnetization. The paper will also discuss some new designs to simplify the mechanical structure.

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Section: Baseline Design Materials and Specificationsmentioning

confidence: 88%

Section: Literature Review On Flux Modulation Magnetic Gearsmentioning

confidence: 99%

Section: Challenges Of Magntic Gears and Magnetically Geard Machinesmentioning

confidence: 99%

See 1 more Smart Citation

Magnetic Gears and Magnetically Geared Machines with Reduced Rare-Earth Elements for Vehicle Applications

Al-Qarni

El-Refaie

2021

WEVJ

View full text Add to dashboard Cite

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“…However, the eccentric magnetic harmonic gear (EMHG) can achieve large torque transmission with high gear ratios, and the torque densities can be up to 150 kN m/m 3 [6], which is the new topological structure of the MG. The EMHG can be integrated into a permanent‐magnet machine, which is more suitable for low speed operation and high torque output applications, such as electric vehicles and wind turbines [7–10].…”

Section: Introductionmentioning

confidence: 99%

Exact magnetic field analytical model for eccentric magnetic harmonic gears using hyperbolic cotangent transformation

Liu

Zhao

Sun

et al. 2020

IET Electric Power Applications

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The eccentric magnetic harmonic gear (EMHG) utilises the change of the magnetic permeability caused by eccentric structure to achieve large torque transmission with high gear ratios. This study presents an exact EMHG analytical model based on the hyperbolic cotangent transformation method. The exact method has no truncation errors and thus it is appropriate for the analysis of magnetic fields in the EMHG with large eccentricity. Firstly, the eccentric air‐gap magnetic field distributions are obtained by modulating the concentric magnetic field distributions with the relative permeance function. Then, the air‐gap flux density of the EMHG is obtained according to the superposition of the flux density by the eccentric rotor and stator permanent magnets acting alone. Furthermore, the analytical results of the air‐gap flux density and electromagnetic torque are compared with those of the finite‐element method, which verifies the correctness and validity of the analytical model. Finally, the experimental measurements on the dual‐stage EMHG confirm the validity of the analytical prediction.

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“…1 Its advantages are particularly obvious in the electromechanical system, which has the characteristics of light weight, heavy load, low power consumption. 2 As mechanical transmission, torque change and deceleration control equipment, gear is widely used in industry and aerospace. 3 On the inertial stabilization platform of aerial remote sensing, due to the influence of flight platform environment, it requires small volume, light weight and strong anti-interference characteristics.…”

Section: Introductionmentioning

confidence: 99%

On-line measurement method of transmission backlash based on angular velocity and double-end angular position information

Liang

Zhang

et al. 2020

Measurement and Control

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Backlash is the inherent characteristic of gear transmission system. It is an important mean to measure and compensate backlash to improve transmission performance. When the driving gear reverses, due to the existence of backlash, the driven gear will still keep its original steering due to inertial motion until the driven gear collision with the driving gear. In this paper, based on the analysis of the tooth gap of the driving gear and the driven gear, an on-line measurement method of the meshing tooth gap combining the angular velocity of the load end with the information of the Angle position of the two axes of the master-slave gear is presented. This method uses the gyroscope at the load end (driven wheel) to monitor the sudden change of angular velocity at the moment of gear reverse impact and re contact, and the signal is used as the judgment basis for the reverse contact moment of the driving gear and driven gear. Then, the angular position data of driving gear and driven gear are fused at the time of reverse rotation and contact impact, and the backlash of the gear is calculated online. Finally, setting up an experimental platform for measuring backlash, and the proposed method is verified. The experimental results show that the proposed method can achieve accurate backlash measurement.

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A Review on Magnetic Gears: Topologies, Computational Models and Design Aspects

Cited by 12 publications

References 66 publications

Magnetic Gears and Magnetically Geared Machines with Reduced Rare-Earth Elements for Vehicle Applications

Magnetic Gears and Magnetically Geared Machines with Reduced Rare-Earth Elements for Vehicle Applications

Exact magnetic field analytical model for eccentric magnetic harmonic gears using hyperbolic cotangent transformation

On-line measurement method of transmission backlash based on angular velocity and double-end angular position information

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