Abstract
This paper proposes a novel flux focusing magnetically geared (MG) machine for wind power generation, considering the permanent magnets (PMs) eddy current loss and the balance between the pull-out torque of MG machine and the back-electromotive force (EMF)of the PM brushless machine. The PM eddy current loss in the two rotors of the conventional surface-mounted MG machine is calculated and analyzed by using finite-element method. By adopting serial-spoke structure in the inner rotor, a novel rotor structure for a MG machine is proposed to reduce the PM eddy current loss. Moreover, in order to balance the pull-out torque and the back-EMF, several serial-spoke structures and the main design parameters are investigated. Then, a quantitative comparison between the proposed topology and the conventional surface-mounted MG machine is performed. The analysis results indicate that the PM eddy current loss of the proposed MG machine can be significantly reduced and its pull-out torque and back-EMF can be balanced well.
Highlights
With the increase of energy problems and environmental pollution, wind power as an abundant, clear, renewable energy resource has gained more and more attention
Wind power generation can be classified as constant speed constant frequency and variable speed constant frequency
A mechanical gearbox and a medium or high speed machine is often engaged to match the low speed of wind turbine and relatively high rotor speed of generator
Summary
With the increase of energy problems and environmental pollution, wind power as an abundant, clear, renewable energy resource has gained more and more attention. Wind power generation can be classified as constant speed constant frequency and variable speed constant frequency. A mechanical gearbox and a medium or high speed machine is often engaged to match the low speed of wind turbine and relatively high rotor speed of generator. These geared wind turbine systems exhibit certain advantages such as high generator efficiency and light weight [5]. The direct-drive wind power PM generator has become more and more attractive due to its lower part count, simplicity and higher reliability prospects
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