Design, Construction, and Analysis of a Large-Scale Inner Stator Radial Flux Magnetically Geared Generator for Wave Energy Conversion

A magnetically geared machine (MGM) integrates a magnetic gear with a low-torque, high-speed electric machine to create a single compact high-torque, low-speed device with the size advantages of a mechanically geared system and the reliability of a direct drive machine. This work investigates the us...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2018-07, Vol.54 (4), p.3305-3314
Main Authors: Johnson, Matthew, Gardner, Matthew C., Toliyat, Hamid A., Englebretson, Steven, Ouyang, Wen, Tschida, Colin
Format: Article
Language:English
Subjects:
Cost
direct drive
efficiency
Electric bridges
end-effects
Energy conversion
Engineering
finite element analysis
Finite element method
Flux
generator
Generators
Gravimetry
large scale
Magnetic flux
magnetic gear
Magnetic gears
magnetically geared machine (MGM)
Modulation
optimization
Product design
radial flux
Rotors
Stators
Torque
torque density
wave energy
Wave power
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Summary:A magnetically geared machine (MGM) integrates a magnetic gear with a low-torque, high-speed electric machine to create a single compact high-torque, low-speed device with the size advantages of a mechanically geared system and the reliability of a direct drive machine. This work investigates the use of MGMs for wave energy conversion through the development of a large-scale magnetically decoupled inner stator radial flux magnetically geared generator rated for 10 kW at an input speed of 30 r/min. Critical design trends are illustrated using parametric two-dimensional and three-dimensional finite element simulation results. Information is also provided about the prototype's mechanical structure and key magneto-mechanical design considerations, including the impact of modulator bridges and the extent of axially escaping leakage flux. The prototype's experimental stall torque of 3870 Nm represents a 99.1% match with the simulated stall torque and corresponds to volumetric and gravimetric torque densities of 82.8 kNm/m 3 and 14.5 Nm/kg, respectively. Additionally, the prototype achieves an experimental efficiency of approximately 90% for operation near rated torque.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2018.2828383