Bearingless Switched Reluctance Motor And Its Control Research

Bearingless switched reluctance motor (BSRM) gathers bearingless technology and switched reluctance speed control technology in integral whole, which not only retains the advantages of traditional SRM, but also avoids the shortcomings of the mechanical bearing. So BSRM is particularly suitable for high-speed applications. At present, BSRM is the forefront of hot topics for the domestic and foreign scholars. This subject which developing the control strategy research to it, may get some basic work for the development and perfection of the technology. Meanwhile, it may provide certain reference value for the study of scholars engaged in related research and our group ongoing BSRM theory research.The topic is come from Natural Science Foundation youth funding project (number:50907003). Firstly, the paper introduces the development status of BSRM. After giving the BSRM structure, the paper describes its radial suspension principle, and gives its mathematical model combined with results of previous, which provides the theory instruction for the finite subsequent element analysis and control system design thereafter. Then, the BSRM finite element model is established by Ansoft simulation software. Based on massive simulated data, the thorough analysis is carried out, which is on the influences of the related parameters to the motor radial force and torque. In addition, this paper also explores the static characteristic of radial force and torque under magnetic saturation and rotor eccentricity. Subsequently, the motor transformation is completed according to topic requirements, while the design, fabrication and debugging work of control platform each modular circuit is completed. The hardware part is mainly including main wingding power circuit, driving circuit and power supply circuit, auxiliary wingding power circuit, driving circuit and power supply circuit, DSP smallest system circuit, rotor position detection and logical processing circuit, rotor radial displacement detection and signal processing circuit, current detection and signal processing circuit, bus voltage detection and signal processing circuit, various protection circuits and so on. At last, the preliminary experiment to the motor is carried on using the control platform designed above, which mainly includes preliminary rotation test, observation of the vibration condition during the test and the motor suspension system static test. Last binding the theory, the test data is analyzed tentatively. The tests firstly verify that the transformation of the system prototype is successful. Simultaneously, this control system design scheme and thinking, and the exploration work of the BSRM radial force and electromagnetism torque characteristic law laid the foundation for the BSRM further study.