Date

2021-6-24

Author

Polat, Hakan

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Slip rings are often used in wound rotor synchronous machines to supply required field excitation during rotation. They mainly consist of carbon brushes and copper rings where the power transmission is achieved by constant friction, which results in mechanical wear over time. To eliminate the contact, brushless exciters are used. However, their low-speed operation is problematic. Therefore, in this thesis, the aim is to design a contactless slip-ring with improved fault tolerance to supply the required field current without physical contact and with a wide speed range limited solely by mechanical limitations. To achieve high reliability, modular design is employed. The power transfer is achieved by two transmitters and four receivers whose outputs are connected in parallel to form a common DC-bus. The system is series-series compensated. The problem of current/power-sharing is solved first analytically with the introduction of cross-coupling and intentional detuning. Then a 1 kW system is designed to experimentally verify the proposed methods. While an increased power-sharing is observed, to further increase the fault tolerance, a middle-stage resonator is added, and an experimental setup is built. Finally, the presented system is mounted on a rotating shaft, and improved fault tolerance compared to conventional single transmitter single receiver inductive power transfer systems is achieved.

Subject Keywords

Wireless power transfer, Inductive power transfer, Series-series compensation, Resonator system, Modularity, Fault tolerance, Reliability

URI

https://hdl.handle.net/11511/91475

Collections

Graduate School of Natural and Applied Sciences, Thesis