Basic Theory And Experiments On Bearingless Synchronous Reluctance Motor

Super high speed drives for machine tools, flywheels, turbomolecular pumps, compressors are required urgently since the fifties of the 20th century, the naissance of bearingless synchronous reluctance motor is demanded for the development of the modern industry production and technology. Bearingless synchronous reluctance motor is a new high speed electric machinery combined the advantages of magnetic bearings and synchronous reluctance motor, compared to the motor supported by slide or ball bearings, it has high speed, no contact, no lubrication, no wear and so on. Furthermore, the benefits are apparent in comparison to the conventional drives with magnetic bearings, such as the motor axial length is shortened, the critical speed is increased and the motor construction is simplified. In addition, compared to other types of bearingless motor, there are many advantages, for example the simple control system, rugged structure, low costs, etc. In particular, bearingless synchronous reluctance motor is advantageous for high-speed applications because of the absence of permanent magnets or windings on the rotor.The bearingless synchronous reluctance motor is a nonlinear and strongly coupled multi-variable system, the realization of the motor suspension operation is a challenge work. In China, it is the first time that the motor is studied in this dissertation, the research focuses on the fundamental theory and experiments for the motor.Firstly, the principles of the rotor suspension are explained, then the whole mathematic models of radial forces and the torque are derived, moreover, an effective decoupling control method is proposed and control system has been simulated in MATLAB.Secondly, because of the absence of the design theory for bearngless motor, a standard induction motor is refitted to a bearingless synchronous reluctance motor in this dissertation, furthermore, analysis and calculation for the motor using finite element method are completed.Finally, hardware for power converter circuit and software based on TMS320LF2407 DSP are designed, test results have validated that the design is demanded for the control system, the program flow charts for the software are also given.In the dissertation, the key technologies of the bearingless synchronous reluctance motor are introduced and some important valuable conclusions are obtained, they can provide the foundation of the further research for this project.