### Abstract

Magnetic gearbox (MGB) is a contactless magnet-based transmission system that transmits mechanical power between two shafts. MGBs offer significant advantages over mechanical gears such as contactless power transfer, high gear ratios, inherent overload protection, high torque density, potential for high efficiency, and maintenance free. Cogging torque minimization is a challenging design aspect and stands as one of the parasitic demerits of MGBs. The proper selection of the combination of the number of pole-pairs of both high and low speed rotors can effectively minimize cogging torque magnitude. However, only some fixed gear ratios can be achieved. For any general desired gear ratio, the torque ripple magnitude may be unacceptable. This paper introduces a new technique for torque ripple reduction in MGB using the axial pole pairing technique, which is usually applied for torque ripple mitigation in conventional PM machines. A conventional 14/4 MGB, which normally results in a significant cogging torque magnitude, is designed and simulated using 3D finite-element analysis (FEA) for different pairing angles for both high and low speed rotors. Based on 3D FEA results, the required optimum pairing angle that optimizes torque transmission while minimizes the corresponding cogging torque is determined.

Original language | English |
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Title of host publication | 7th IET International Conference on Power Electronics, Machines and Drives, PEMD 2014 |

Publisher | Institution of Engineering and Technology |

ISBN (Print) | 9781849198158 |

Publication status | Published - 2014 |

Externally published | Yes |

Event | 7th IET International Conference on Power Electronics, Machines and Drives, PEMD 2014 - Manchester, United Kingdom Duration: 8 Apr 2014 → 10 Apr 2014 |

### Other

Other | 7th IET International Conference on Power Electronics, Machines and Drives, PEMD 2014 |
---|---|

Country | United Kingdom |

City | Manchester |

Period | 8/4/14 → 10/4/14 |

### Fingerprint

### Keywords

- Cogging torque
- Magnetic gear
- Permanent magnet (PM) machines
- Pole pairing
- Torque ripples

### ASJC Scopus subject areas

- Electrical and Electronic Engineering

### Cite this

*7th IET International Conference on Power Electronics, Machines and Drives, PEMD 2014*Institution of Engineering and Technology.

**Torque ripple reduction of radial magnetic gearbox using axial pole pairing.** / Zaytoon, H.; Abdel-Khalik, Ayman; Massoud, A.; Ahmed, Shehab; Elarabawy, I.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

*7th IET International Conference on Power Electronics, Machines and Drives, PEMD 2014.*Institution of Engineering and Technology, 7th IET International Conference on Power Electronics, Machines and Drives, PEMD 2014, Manchester, United Kingdom, 8/4/14.

}

TY - GEN

T1 - Torque ripple reduction of radial magnetic gearbox using axial pole pairing

AU - Zaytoon, H.

AU - Abdel-Khalik, Ayman

AU - Massoud, A.

AU - Ahmed, Shehab

AU - Elarabawy, I.

PY - 2014

Y1 - 2014

N2 - Magnetic gearbox (MGB) is a contactless magnet-based transmission system that transmits mechanical power between two shafts. MGBs offer significant advantages over mechanical gears such as contactless power transfer, high gear ratios, inherent overload protection, high torque density, potential for high efficiency, and maintenance free. Cogging torque minimization is a challenging design aspect and stands as one of the parasitic demerits of MGBs. The proper selection of the combination of the number of pole-pairs of both high and low speed rotors can effectively minimize cogging torque magnitude. However, only some fixed gear ratios can be achieved. For any general desired gear ratio, the torque ripple magnitude may be unacceptable. This paper introduces a new technique for torque ripple reduction in MGB using the axial pole pairing technique, which is usually applied for torque ripple mitigation in conventional PM machines. A conventional 14/4 MGB, which normally results in a significant cogging torque magnitude, is designed and simulated using 3D finite-element analysis (FEA) for different pairing angles for both high and low speed rotors. Based on 3D FEA results, the required optimum pairing angle that optimizes torque transmission while minimizes the corresponding cogging torque is determined.

AB - Magnetic gearbox (MGB) is a contactless magnet-based transmission system that transmits mechanical power between two shafts. MGBs offer significant advantages over mechanical gears such as contactless power transfer, high gear ratios, inherent overload protection, high torque density, potential for high efficiency, and maintenance free. Cogging torque minimization is a challenging design aspect and stands as one of the parasitic demerits of MGBs. The proper selection of the combination of the number of pole-pairs of both high and low speed rotors can effectively minimize cogging torque magnitude. However, only some fixed gear ratios can be achieved. For any general desired gear ratio, the torque ripple magnitude may be unacceptable. This paper introduces a new technique for torque ripple reduction in MGB using the axial pole pairing technique, which is usually applied for torque ripple mitigation in conventional PM machines. A conventional 14/4 MGB, which normally results in a significant cogging torque magnitude, is designed and simulated using 3D finite-element analysis (FEA) for different pairing angles for both high and low speed rotors. Based on 3D FEA results, the required optimum pairing angle that optimizes torque transmission while minimizes the corresponding cogging torque is determined.

KW - Cogging torque

KW - Magnetic gear

KW - Permanent magnet (PM) machines

KW - Pole pairing

KW - Torque ripples

UR - http://www.scopus.com/inward/record.url?scp=84907388530&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84907388530&partnerID=8YFLogxK

M3 - Conference contribution

SN - 9781849198158

BT - 7th IET International Conference on Power Electronics, Machines and Drives, PEMD 2014

PB - Institution of Engineering and Technology

ER -