Design Of 100kW Permanent Magnet Wind Generator And Calculation And Analysis Of Eddy Current Losses In Permanent Magnet

Direct Driven Permanent Magnet Wind Generator has a lot of advantages:a light weight, high efficiency, low noise, low maintenance costs and reliable operation. It is occupying larger and larger share of the wind power market. The design technology of wind generator as the core of wind generator system becomes a big challenge for researchers. And heat dissipation of rotor was considered less in the traditional design, which exacerbated the possibility of permanent magnet demagnetization. So this thesis has been analyzed deeply the eddy current loss in permanent magnet. The main contents are as follows:Firstly, the reason of eddy current loss in the permanent magnet is analyzed and the air gap permeance expression of surface motor with pole shoe is derived. On the Basis of harmonic theory, the content of space harmonic is analyzed by combining finite element. The calculation method of eddy current loss is summarized. It has been summed up that slot opening size, the length of air gap, pole-arc coefficient, current waveform distortion and different pole and slot combinations have impact on eddy current losses, obtained:Slot opening size, the length of air gap, current waveform distortion and pole-arc coefficient have great impact on eddy current losses; for three kind of pole and slot combinations as 40 poles 42 slots,40 poles 45 slots and 40 poles 48 slots,40 poles 42 slots and 40 poles 45 slots which include even orders of space harmonic have greater eddy current losses.Secondly, the radial flux permanent magnet wind generator has been designed, which rating power is 100kW, rating speed is 100r/min and efficiency is 94%.The combinations of pole and slot as 40 poles 42 slots,40 poles 45 slots and 40 poles 48 slots are calculated and compared. Then combined with electromagnetic field calculation, the impact of the main size ratio on the amount of useful effective material was analyzed, obtained:The amount of useful effective material increases with increasing main size ratio. When(?) isn't little than 6.16. the increasing amplitude of the amount of useful effective material is big. The impact of the sizes of permanent magnet on reactance parameters, No-Load EMF and cogging torque was analyzed. There is no irreversible magnet demagnetization in motor three-phase sudden short-circuit simulation. The impact of the ratio of slot height and slot width on copper loss and core loss was analyzed, obtained:When the slot assurance is constant, there will be a turning point in the curve that make the core loss do not reduce again by changing the ratio of slot height and slot width. Eventually, the design rationality was verified by electromagnetic field calculation and experiment.