Analysis And Design Of Bearingless Flux-Switching Permanent Magnet Motor

Bearingless motors combine the functions of magnetic bearing and motors, and have the advantages of no friction, no lubrication, long life, which have good application in the flywheel energy storage, aerospace and chemical industry fields. However the conventional bearingless permanent magnet motors having magnets in the rotor (called as rotor-PM motors) compromise the performance due to the poor cooling and high speed limitation. In the paper,3-phase bearingless flux-switching permanent magnet (called as BFSPM) motor with 12-stator-teeth/10-rotor-poles and 12-stator-teeth/10-rotor-poles are proposed, in which both the armature windings, suspending windings and PMs are in the stator, while no PMs or windings is in the rotor. In addition, the proposed BFSPM motors inherit the advantages of FSPM motors, including high power density, consistency and compensation between two sets of the armature windings, etc. The topology structure and operation principles are introduced firstly. Secondly, the electromagnetic characteristics are investigated and the optimization design of 12/10 pole BFSPM motor have been completed by finite-element parametric design. Finally, the experimental platform of drive and control system is established based on the digital signal processor TMS320F28335. The results of this thesis lay a theoretical foundation for BFSPM motor in the further research.The main work done in this thesis is briefly listed as follows:(1)The topology structure and suspension force principle are of the proposed 12/10 pole and 12/14 pole BFSPM are analyzed..(2) The 2-D finite-element model is built based on Ansoft and electromagnetic performances are compared for the two structure motors. In addition, static characteristics and performance of rotor eccentricity are analyzed for 12/10 pole BFSPM motor.(3) The iron losses are calculated in different operation conditions, including no-load, only armature current or suspending current, and the eddy current loss of PMs and copper loss are calculated too.(4) The output power equations of 12/10 pole BFSPM motor are deduced, and the effects of main dimensions on the performance are studied. In addition, the motor is manufactured.(5) The drive and contol system is built based on the digital signal processor TMS320F28335. The main hardware of the system includes power converter, isolating and driving of the PWM signal, sampling and processing of the signals of voltage or current, as well as hardware protection circuit, etc.