Design and Experimental Testing of a Magnetic Gear for an Electric Aircraft Drivetrain

Article Energy & Fuels

Experimentally Testing a Halbach Rotor Coaxial Magnetic Gear With 279 Nm/L Torque Density

Ho Yin Wong et al.

Summary: This paper presents the design, analysis, and experimental testing results of a 5.67:1 Halbach rotor magnetic gear with a ferromagnetic back support. The testing results of two different support designs, rectangular modulation supports and bridgeless circular modulation support rod, are evaluated. The presented design demonstrates the capability to operate with a peak torque of 189 Nm and an active region torque density of 279.3 Nm/L.

IEEE TRANSACTIONS ON ENERGY CONVERSION (2023)

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Article Energy & Fuels

Pole and Segment Combination in Concentric Magnetic Gears: Vibrations and Acoustic Signature

Simon Staal Nielsen et al.

Summary: This paper examines the impact of cogging torque and unbalanced radial magnetic forces on vibrations and acoustic noise properties in concentric magnetic gears through three physical demonstrators with unique properties. It shows how these factors dominate the acoustic and vibrational properties and affect the sensitivity of the magnetic gears to system eigenfrequencies.

IEEE TRANSACTIONS ON ENERGY CONVERSION (2022)

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Article Engineering, Electrical & Electronic

A Review of Electric Aircraft Drivetrain Motor Technology

Jonathan Z. Bird

Summary: This article reviews the power density and torque density of permanent magnet motor technology in electric aircraft, and suggests using magnetic gearing and an integrated contra-rotating motor propeller co-design approach to increase propulsive thrust performance and overall power density.

IEEE TRANSACTIONS ON MAGNETICS (2022)

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Article Engineering, Electrical & Electronic

Review and Analysis of Coaxial Magnetic Gear Pole Pair Count Selection Effects

Bryton Praslicka et al.

Summary: This article investigates the impact of design parameters on the performance of magnetic gears and proposes new factors to measure torque ripple. The study suggests that considering symmetry and choosing noninteger gear ratios can help reduce torque ripple.

IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS (2022)

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Article Engineering, Electrical & Electronic

A Dual-Stack Coaxial Magnetic Gear for a Wave Energy Conversion Generator

Hossein Baninajar et al.

Summary: This article presents the design and analysis of a 7.67:1 gear ratio magnetic gear for a wave energy converter, which achieved high efficiency and torque density through a unique rotor topology and the use of laminated magnets and low-loss electrical steel.

IEEE TRANSACTIONS ON MAGNETICS (2022)

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Article Energy & Fuels

Optimization of Coaxial Magnetic Gear Design and Magnet Material Grade at Different Temperatures and Gear Ratios

Matthew C. Gardner et al.

Summary: Magnetic gears have the potential to optimize designs for higher specific torque by using different magnet materials on different rotors, especially when designing with a large gear ratio. The increase in temperature results in an exponential decay in achievable specific torque, but does not significantly impact optimal geometric parameters, primarily affecting optimal materials.

IEEE TRANSACTIONS ON ENERGY CONVERSION (2021)

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Article Computer Science, Information Systems