| A bearingless induction motor(BL-IM)utilizes the similarity of the magnetic bearing and the stator structure of the motor,and inserts another set of levitation windings on an ordinary motor with only one set of torque windings,which can realize the rotation of the motor and self-suspension at the same time,It exhibits a wide range of application values in flywheel energy storage,aerospace industry,medical field,high-clean operation even some other fields.This paper focuses on the BL-IM operating mechanism,mathematical model establishment,rotor mass imbalance compensation and digital control system.The staple research contents and results are shown below:Firstly,the BL-IM research background,research status,future trends and application fields are discoursed.The design idea of the BL-IM,the principle of suspension and the conditions of stable suspension are described.Analytical method is used to build the mathematical model of the motor,and the air-gap field-oriented control strategy is selected in many vector controls to consolidate the theoretical foundation for the subsequent vibration compensation.Secondly,in order to solve the problem of eccentric vibration of the rotor mass of the bearingless asynchronous motor caused by the mechanical imbalance and improve the suspension performance of the rotor,two different compensation control strategies are designed and a brief comparative analysis is made.One is based on a Radial-Basis Function(RBF)neural network control method to control the displacement of the rotor,this method is generally suitable for occasions with a high speed.The other is the compensation control strategy of Unbalance Mass Radius Product(UMRP)search,this method is generally suitable for occasions with higher suspension requirements.In order to verify the effectiveness of the two methods,simulation models were constructed in Matlab and the two compensation control strategies are analyzed.Finally,a BL-IM rotor unbalance compensation digital control experimental platform with TMS320F2812 as the core is constructed.The speed response characteristics,levitation characteristics and current characteristics are researched on the experimental platform,and the experimental results are analyzed.The designed digital control system can not only realize the stable suspension of the BL-IM,but also has good dynamic and static performance according to the experimental results. |
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