PROJECT TITLE :
Study of Direct-Drive Permanent-Magnet Synchronous Generators With Solid Rotor Back Iron and Different Windings
Direct-drive permanent magnet (PM) synchronous generators (DDPMSGs) are gaining more and more attention and application for wind power. This paper presents a comprehensive performance comparison of an external rotor surface-mounted PM synchronous generator equipped with 3 commonly used winding sorts, i.e., integral-slot distributed winding (ISDW), fractional-slot concentrated winding (FSCW), and fractional-slot distributed winding. The tradeoff between torque and the power factor, loss distribution, current, torque, and PM demagnetization characteristics below a brief-circuit fault and the steady temperature rise are investigated and compared using finite-element analyses. It is found that, generally, FSCW PM generators exhibit high rotor losses compared with ISDWs, that can lead to a very heat rise. Measures like phase PMs and also the adoption of lamination steel within the rotor can scale back the rotor loss and greatly improve the machine potency. However, the temperature rise of FSCW machines is still over that of ISDW machines. The conclusion is meant to help select the correct winding types.
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