Mass Eccentricity Vibration Control For A Bearingless Switched Reluctance Motor

Bearingless switched reluctance motor(BSRM) integrates functions of rotation and levitation and has the advantages of simple structure and good adaption for high speed and bad environment. The motor has potential application prospect in the field as aerospace actuation. The technique of self-bearing in switched reluctance motor(SRM) can suppress the vibration in the motor and mechanical noise by control the magnetic force between the rotor and stator actively.This article takes the single-winding and double winding structure BSRM as the research objects. In order to suppress the vibration caused by the mass eccentricity of the rotor, different unbalanced compensation control methods are proposed. The main contents are concluded as follow:Firstly, the mathematical models of BSRM based on the virtual displacement and maxwell stress method are deduced, supplying the mathematical foundation for unbalanced compensation.Then, the methods using the algorithm of least mean square(LMS) and coordination transformation are applied to suppress the vibration on the stator housing by controlling no centrifugal force in controller. In the other side, in order to restrain the rotor spin around its geometric center, extra compensation force is added in the controller to decrease the influence of centrifugal force to minimize the displacement of rotor.Finally, due to the abrupt change of the radial force in each phase, the method of controlling the rise time and descent time of current and optimizing the current function is used to restrain the high frequency component in the vibration.Based on the above thoery research, the experiments are conducted on the platform of double-winding and single-winding structure BSRM to verify the availability of the proposed unbalanced compensation methods.