Analysis and Testing of a Coaxial Magnetic Gearbox With Flux Concentration Halbach Rotors

doi:10.1109/TMAG.2017.2715799

Title: Analysis and Testing of a Coaxial Magnetic Gearbox With Flux Concentration Halbach Rotors

Abstract

Halbach array magnetic gearboxes have been discussed as being able to create high torque density. However, Halbach arrays are difficult to mechanically assemble, and often the effective air gap must be made larger to provide space for a retaining sleeve. This paper investigates here the benefits of using an additional ferromagnetic retaining pole within the Halbach array structure. It is shown that utilizing this flux concentration ferromagnetic pole improves the torque density and can also help retain the magnets in place.

Authors:

Som, Debarupa ^[1]; Li, Kang ^[1]; Kadel, Joshua ^[1]; Wright, Jason ^[1]; Modaresahmadi, Sina ^[1];

^[2]; William, W. ^[1]

Univ. of North Carolina, Charlotte, NC (United States). Dept. of Electrical and Computer Engineering
Portland State Univ., Portland, OR (United States). Dept. of Electrical and Computer Engineering

Publication Date:: 2017-06-15

Research Org.:: Univ. of North Carolina, Charlotte, NC (United States)

Sponsoring Org.:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Wind Energy Technologies Office (EE-4WE)

OSTI Identifier:: 1505685

Grant/Contract Number:: EE0006801

Resource Type:: Accepted Manuscript

Journal Name:: IEEE Transactions on Magnetics

Additional Journal Information:: Journal Volume: 53; Journal Issue: 11; Journal ID: ISSN 0018-9464

Publisher:: Institute of Electrical and Electronics Engineers. Magnetics Group

Country of Publication:: United States

Language:: English

Subject:: 42 ENGINEERING; analytical models; axial coupling; electromagnetic forces; Halbach rotor; radial coupling

Citation Formats


                    Som, Debarupa, Li, Kang, Kadel, Joshua, Wright, Jason, Modaresahmadi, Sina, Bird, Jonathan Z., and William, W. Analysis and Testing of a Coaxial Magnetic Gearbox With Flux Concentration Halbach Rotors.  United States: N. p., 2017. 
        Web.  doi:10.1109/TMAG.2017.2715799.

Copy to clipboard


                    Som, Debarupa, Li, Kang, Kadel, Joshua, Wright, Jason, Modaresahmadi, Sina, Bird, Jonathan Z., & William, W. Analysis and Testing of a Coaxial Magnetic Gearbox With Flux Concentration Halbach Rotors.  United States.  doi:10.1109/TMAG.2017.2715799.

Copy to clipboard


                    Som, Debarupa, Li, Kang, Kadel, Joshua, Wright, Jason, Modaresahmadi, Sina, Bird, Jonathan Z., and William, W. Thu .  
        "Analysis and Testing of a Coaxial Magnetic Gearbox With Flux Concentration Halbach Rotors".  United States.  doi:10.1109/TMAG.2017.2715799.  https://www.osti.gov/servlets/purl/1505685.

Copy to clipboard


                    
@article{osti_1505685,

  title        = {Analysis and Testing of a Coaxial Magnetic Gearbox With Flux Concentration Halbach Rotors},

  author       = {Som, Debarupa and Li, Kang and Kadel, Joshua and Wright, Jason and Modaresahmadi, Sina and Bird, Jonathan Z. and William, W.},

  abstractNote = {Halbach array magnetic gearboxes have been discussed as being able to create high torque density. However, Halbach arrays are difficult to mechanically assemble, and often the effective air gap must be made larger to provide space for a retaining sleeve. This paper investigates here the benefits of using an additional ferromagnetic retaining pole within the Halbach array structure. It is shown that utilizing this flux concentration ferromagnetic pole improves the torque density and can also help retain the magnets in place.},

  doi          = {10.1109/TMAG.2017.2715799},

  journal      = {IEEE Transactions on Magnetics},

  number       = 11,

  volume       = 53,

  place        = {United States},

  year         = {2017},

  month        = {6}

}

Copy to clipboard

Journal Article:

Free Publicly Available Full Text

Accepted Manuscript (DOE)

Publisher's Version of Record

DOI: 10.1109/TMAG.2017.2715799

Other availability

Search WorldCat to find libraries that may hold this journal

Citation Metrics:

Cited by: 12 works

Citation information provided by
Web of Science

Figures / Tables:

Fig. 1: Cross-sectional view of a 4.25:1 flux concentration Halbach rotor magnetic gearbox. The inner rotor as p₁=4 pole-pairs, the outer rotor has p₃=13 pole-pairs and there are $n_2$ =17 ferromagnetic segments.

All figures and tables (22 total)

Save / Share:

Export Metadata

Save to My Library

Figures / Tables found in this record:

Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.

Similar records in OSTI.GOV collections:

Advanced High Torque Density Magnetically Geared Generator

Technical Report Bird, Jonathan ; Williams, Wesley

The objective of this research project was to investigate the fundamental torque density limitations of multistage flux focusing magnetic gears and magnetically geared direct-drive generators for wind turbines. Magnetic gears create non-contact speed amplification by modulating the air-gap magnetic field harmonics created by magnetic rotors. By integrating a stator into the magnetic gear structure a very high torque density direct-drive generator can be created. Magnetic geared systems offer unique capabilities that are currently not available using existing mechanically geared systems, such as overload protection. Magnetic gears also offer the potential for higher reliability, higher efficiency and quieter operation than ismore »« less
DOI: 10.2172/1494152

Full Text Available
Investigating the Performance of a Fully Laminated Flux-Focusing Magnetic Gearbox

Journal Article Li, Kang ; Uppalapati, Krishna Kiran ; Wright, Jason ; ... - Progress in Electromagnetics Research C

This paper presents here the design investigation and experimental testing of a flux-focusing magnetic gearbox with a fully laminated rotor structure. The unique feature of this flux-focusing magnetic gearbox design is that the three rotors are each made of a single lamination stack, and the central modulation structure is retained in place without the use of a resin filler such as epoxy. Ferromagnetic bridges are used to connect individual pole pieces together. It is shown that the use of the ferromagnetic bridges reduces the calculated torque density from 156 Nm/L to 139 Nm/L (a reduction of 11%). The experimentally measuredmore »« less
DOI: 10.2528/PIERC18062509

Full Text Available
A comparative analysis of torque production in Halbach and conventional surface-mounted permanent-magnet synchronous motors

Conference Ofori-Tenkorang, J. ; Lang, J.H.

The general question of when and why one should use a Halbach rotor in the design of surface-mounted permanent-magnet synchronous motors is addressed. The torque production capabilities of Halbach and conventional magnet arrays under the constraints of fixed magnet volume, and fixed power dissipation in slotless armature windings, are compared and the results presented in a graphical manner along with intuitive models that qualitatively explain these results. They conclude that, for permanent-magnet synchronous motors where the application precludes the use of a magnetic back-iron, the Halbach array always produces higher torque than the conventional array, for the same volume ofmore »« less
Vibration Analysis of the First Stage of a Multi-stage Coaxial Magnetic Gearbox

Conference Modaresahmadi, Sina ; Li, Kang ; Williams, Wesley ; ...

This paper describes an analytical model of a single stage of a series- connected multi- stage coaxial magnetic gear (MSMG). This model is a system of spring-mass-dampers which is then used to investigate the vibrational modes and natural frequencies of the system at the rotational speeds observed during operation. This approach includes the bending and shear forces created in the magnetically active area of the gearbox which are generated due to the relative motion of the magnets that in turn produce fluctuating magnetic fields. Understanding these vibrational modes is important for magnetic gearboxes to realize their potential for long duration,more » low maintenance operation.« less
DOI: 10.1109/SECON.2018.8478981

Full Text Available
Electromagnetic analysis and experimental testing of a flux focusing wind turbine magnetic gearbox

Journal Article Li, Kang ; Modaresahmadi, Sina ; Williams, Wesley ; ... - IEEE Transactions on Energy Conversion

The electromagnetic design of the second stage of a 59:1 multistage magnetic gearbox for a wind turbine demonstrator is presented here. The multistage series connected magnetic gearbox is composed of a 6.45:1 first stage and 9.14:1 second stage magnetic gear. The magnetic gears utilize a flux focusing spoke type rotor typology with a unique segmented fully laminated design. The electromagnetic impact of structural design changes on the second stage gearbox is considered with respect to torque density. Severe 3-D edge effects were encountered that greatly reduced the expect torque density of the stage 2 magnetic gear. Experimental testing of themore »« less
DOI: 10.1109/TEC.2019.2911966

Similar Records