Novel Rotary Transformer Topology With Improved Power Transfer Capability for High-Speed Applications

This article proposes a new rotary transformer topology enabling reduction of leakage inductances and significant improvement of power transfer capability compared to traditional topologies thanks to its interleaved windings and resonant compensation circuits. The proposed rotary transformer feature...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2020-01, Vol.56 (1), p.277-286
Main Authors: Raminosoa, Tsarafidy, Wiles, Randy H., Wilkins, Jonathan
Format: Article
Language:English
Subjects:
ADVANCED PROPULSION SYSTEMS
Air gaps
Capacitors
Coils (windings)
Composite materials
Electric vehicle
Hybrid vehicles
Interleaved windings
Oil insulation
Power efficiency
Power transfer
Power transformer insulation
rotary transformer
rotor excitation
Rotors
Synchronous machines
Topology
Traction motors
Transformers
Windings
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Summary:This article proposes a new rotary transformer topology enabling reduction of leakage inductances and significant improvement of power transfer capability compared to traditional topologies thanks to its interleaved windings and resonant compensation circuits. The proposed rotary transformer features a nonferrite rotating part made of lightweight strong nonconductive and nonmagnetic composite material and a large air gap, allowing safe operation at high rotational speeds. Hence, this novel rotary transformer can enable the adoption of wound rotor synchronous machines for electric or hybrid vehicle traction. The performance of the proposed new topology was evaluated and compared to the conventional one. Significant performance improvement was confirmed. A 10-kW proof of concept prototypes was built, and the test has validated the power transfer capability with 95.9% efficiency.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2019.2955050