| Like the double windings bearingless permanent magnet synchronous motor(BPMSM),single winding BPMSM has also the advantages of high power density,no lubricant,no wear,no mechanical noise,and so on,and there exist the extra merits which include smaller motor size,simpler processing process and lower power loss.With the production technical innovation and the increase of manufacturing level,the industrial automation makes more stringent requirements on design and application of modern permanent magnet motors.So they have broad application prospects in the fields of centrifugal compressors,artificial heart blood pump,industrial robot and flywheel energy storage systems,etc..The principle of internal structure of motor,scheme of an improved T-shaped winding structure,closed loop control strategy of the suspension force vector and simulation model and experiment platform are done depth researches in this dissertation.The basic contents and achievements are as follows:(1)Firstly,the development,research and application of BPMSM and single winding BPMSM at home and aboard are presented.On the basis of a review of the winding structure and control strategy of various bearingless motors,a novel BPMSM with dual three-phase windings topology is proposed;an analysis on operatation mechanism and mathematical model is done detailedly;the model is simulated and analyzed based on ANSYS/Maxwell.In addition,a control strategy of supplying unbalanced phase current for controlling the motor is established correspondingly.Modeling and simulation are performed for the control system by Matlab.(2)Secondly,in order to optimize the structure of the double three phase BPMSM,a T-shaped single winding configuration is proposed,it allows the motional-EMFs of the corresponding phase windings to offset each other in the opposite direction,and avoids the side-effects on the normal suspension force current.The analytical expressions are further derived and the motional-EMF and motor performance parameters are analyzed by finite element method.In addition,a suspension force vector closed loop control strategy with a winding current observation is proposed to improve the suspension performance.The control strategy is demonstrated by software(MATLAB)simulation.(3)Finally,according to the control strategy,the hardware circuit and software system are designed by using digital control processor TMS320F2812.The DSP minimum system circuit,main drive circuit and signal sampling circuit are designed and welded,the system software design flow is provided.Thus,the internal winding of a prototype of double winding BPMSM is folded again based on the T-type winding structure,and debugging and experimental analysis aredone,the value of measured waveforms are obtained and the purpose of the research and the expected results of the experiment are realized. |
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