Direct-driven permanent-magnet generator design method for small-scale maglev bearing system wind turbine

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Direct-driven permanent-magnet generator design method for small-scale maglev bearing system wind turbine


Author: Jiang, Guanming
Title: Direct-driven permanent-magnet generator design method for small-scale maglev bearing system wind turbine
Degree: M.Eng.
Year: 2010
Subject: Hong Kong Polytechnic University -- Dissertations
Permanent magnet motors
Magnetic suspension
Wind turbines -- Design and construction
Department: Dept. of Building Services Engineering
Pages: vi, 110 leaves : ill. ; 31 cm.
Abstract: There are quiet a lot of problems as fossile fuel are becoming gradually exhausted since 1980s. It is important and necessary tofind an alternative renewable resource. Wind power becomes one option, beacase it has many advatages comparing with others. This thesis developed a design method of the vertical wind turbine generator with a maglev bearing, permanent-magnets direct-driven (PMDD) structure. This study analyzed advantages and disadvantages of topology types and gear structures and investigated the features of low starting speed and maglev bearing structure. The axial flux direct-driven structure is slightly larger than conventional type (with gear box) but it had higher efficiency than the latter one. In additional, there are many features of maglev bearing system such as lower starting torque and lower average losses. The numerical values of average torque, starting torque, diameter, volume and height were calculated by certain equations. The magnets intensity, inductance and resistance were simu1ated by the software Ansys which were compared with the therotical value. Matlab was used to simulate the power output and the losses considering the inductance and resistance which were achieved by the software Ansys and equation calculations. The power losses should be controlled at the lower level to enhence the efficiency. This thesis emphasized to the starting torque, average torque, weight and power losses which should be balanced by the equations and software simulation results. In other word, the power losses and torque value could optimize the diameter which could be slightly diminished as possible. According to the results and figures it gives that the torque and losses could be decreased when the diameter and total weight were diminished. In general, according to this method of design, the performance of Maglev-Bearing system wind turbine was maximized, the cut-in wind speed of system was contolled in a lower level.

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