| A bearingless induction motor(BIM)with magnetic bearings and traditional induction motor is developed to meet the needs of modern industrial production for high speed and performance.BIM counts among the most promising bearingless motors because it can meet the requirements of bearingless support operation in clean,corrosive,high speed and super high speed environment.This dissertation conducts research on BIM operation mechanism,mathematical model establishment,sensorless speed sensor control,support vector machine inverse decoupling control and digital control system implementation.The main work and achievements of the thesis are as follows:(1)The current status of the BIM globally is reviewed,and the development trends and application fields are introduced.Through describing the operational mechanism of the BIM,a mathematical model is established to build the air-gap field-oriented control system,which lays a foundation for motor design and high-performance control.(2)This dissertation a sensorless control strategy based on iterative central differential Kalman filter to solve the problem of low cost self-detection of rotational speed in the BIM operation control.This method combines Sterling interpolation formula with iterative cycle and introduces Kalman filter to estimate the rotor speed of the motor and achieve the stable suspension under the speed sensorless mode of the BIM.(3)This dissertation proposes an inverse decoupling control strategy for support vector machines based on simulated annealing particle swarm optimization,aiming at the characteristics of BIM multivariable,nonlinear and strongly coupled complex systems.This method,based on the BIM mathematical model,uses the nonlinear support vector mechanism to build its inverse system,which is in series with the original system to form a pseudo-linear composite system.The original nonlinear system of BIM was decoupled into three subsystems,and then SA-PSO was introduced to improve the parameter fitting accuracy.The results show that the decoupling control strategy can realize the dynamic decoupling and stable suspension operation between the rotational speed radial displacement and magnetic linkage of BIM.(4)A BIM digital control system experimental platform is established with the TMS320F2812 DSP as the control core.The results verify that the designed digital control system can achieve stable suspension of the BIM and high dynamic and static performance. |
PDF Full Text Request