Design and optimization of bearingless permanent magnet slice motors for high speed and high power density applications
Focusing on the design of bearingless permanent magnet slice motors for high speed and high power density applications,the topology,winding structure,main dimensions,control method and process scheme were optimized.Through the analysis of working conditions,the features of the topology can be concluded.As a result,a surface-mounted type bearingless permanent magnet slice motor with dual-three phase toroidal combined windings was proposed.Taking both the torque and suspension force into consideration,the ratio of the internal and external diameter,the length of magnetic gap and the pa-rameters of the permanent magnets were optimized.Besides,to avoid the decrease of suspension force due to saturation and end-winding effect,the control method leading-angle field-weakening was adopted as well as making the stator slightly longer than the rotor.The finite element analysis model and the ex-perimental prototype were set up to evaluate the torque and suspension force performance.It is proved that the proposed model is able to produce the needed torque and suspension force with good performance.
bearingless permanent magnet slice motorhigh speed and high power densitytoroidal wind-ingoptimizationfield-weakening controlend-winding effect
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