Design And Research On Key Technology Of 1.5MW Permanent Magnet Synchronous Generator With A Single Stage Gearbox

Wind energy with its advantage of abundant reserves and no pollution, greatly easing fossil energy crisis and environment pollution problem, are being much accounted of by world countries. To improve design and manufacturing technology of wind generator, core of wind turbine system, becomes serious challenge for researchers. This thesis summarizes advantages and disadvantages of existing wind generator, analyzes key design technology of Direct Driven Permanent Synchronous Generator (DDPMG), especially the Permanent Magnet Generator with a single stage gearbox (PMG1G), and finally designs a 1.5MW PMG1G.First, this thesis establishes mode for rectifier techniques including diode rectifier without reactive power compensation, diode rectifier with reactive power compensation and filter circuit, and PWM rectifier in output side of DDPMG, reaching a conclusion that load power factor can be reached 1 and setting the stage for PMG1G design using less electromagnetic materials and enhancing running performance. And this thesis derives perfect design method for PMG1G through studying selection of pole and slot combination, weakening of cogging torque, design of rotor magnet structure, and inductance of stator particularly slot leakage inductance of closed slots.Integrating the design method mentioned above and manufacturer's requirements, this thesis designs five 1.5MW PMG1G under the same qualification with combination of pole and slot as 32 poles 132 slots,40 poles 192 slots,50 poles 180 slots,50 poles 180 slots and 60 poles 216 slots.The 50 poles 180 slots generator has the advantage in amount of electromagnetic materials usage, voltage regulation rate, and electrical efficiency.Finally, this thesis validates the unload and output performance through the unload, load and sudden three-phase short-circuit simulation of the best electromagnetic project by Ansoft Maxwell finite-element analysis (FEA), and get the working point of the permanent magnet pole which demagnetize most seriously when sudden three-phase short-circuit happens, all meeting the design requirement. The results also prove the legitimacy of the study of key design technology for PMG1G. In the end, this thesis calculates temperature rise of 1.5MW 50 poles 180 slots PMG1G with the maximum point of 59.6K in stator, using ANSYS FEA software.