Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 27, Issue 11, Pages 4638-4645Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2012.2191160
Keywords
Brushless; capacitive power transfer; noncontact; resonant converter; rotating capacitor; slip rings; wireless power transfer; wound field synchronous machine (WFSM)
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Permanent magnet (PM) synchronous machines are utilized in a wide variety of applications due to their many desirable characteristics, including high torque density capability and high efficiency. In the near future, however, the demand for the PM rare earth materials is projected to exceed world production. As a result, electric machines that do not rely on rare earth materials, such as wound field synchronous machines (WFSMs), are receiving renewed attention for use in traction and wind energy applications. However, WFSMs require a current delivery mechanism to the rotor such as mechanical slip rings whose components require periodic replacement and generate adverse debris within the machine enclosure. Rotary transformers may replace slip rings but also introduce rotor speed dependences and magnetic coupling difficulties. This paper proposes a capacitive noncontact power transfer technique to eliminate the need for mechanical slip rings while also avoiding the pitfalls of rotating transformer technologies. The capacitive power transfer system is compared to traditional rotor power coupling techniques and its performance is validated with experimental results.
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