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Low cost and low cogging torque are the most important aspects in the design of direct drive PM wind generators. In this paper a low cost PM wind generator with an irregular, parallel slotted stator is analysed with respect to cogging torque. The sensitivity of average torque and cogging torque to machine dimension variations are investigated. From this a method is proposed whereby regions of low...
This paper proposes a new outer-rotor permanent-magnet (PM) vernier machine for direct-drive wind power generation, which can offer low-speed operation to directly capture wind power, and enable high-speed rotating field design to maximize the power density. Compared with its mechanical gear counterpart, the proposed machine can eliminate the mechanical wear and tear as well as gear transmission loss,...
This paper aims to the disadvantage of high adjustment rate and many ripples for PM synchronous generator in wind power generation system, presents a newly brushless dc wind generator, whose rotor adopts tangential structure and Ferrite material in permanent magnet to increase flux, and the stator is composed of Single-wave winding structure connected polyphase full wave non-controlled rectification...
In order to overcome the problems such as heavy distortion of winding current, low power factor and high cost of DC inductor met in the traditional rectified permanent magnet (PM) wind generation system, a circuit of cascaded single phase power factor correction (PFC) rectifier pair is proposed and discussed. In the new scheme, proper designed armature inductor of the generator is used as boost inductor,...
In this paper, a new PM brushless hybrid machine is proposed and implemented for wind power generation. The key is to incorporate a small DC field winding and an extra air bridge so that the airgap flux can be effectively strengthened or weakened to online keep the output voltage constant throughout the whole wind speed range. Based on its magnetic circuit, it can be derived that a small change in...
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