Design And Analysis Of A Novel Double Stator Bearingless Switched Reluctance Motor

As a major national development strategic planning,high-end equipment manufacturing industry has made great progress in recent years.As a kind of precision mechanical equipment,bearingless switched reluctance motor has a broad prospect in aeronautical starting/generator system,vacuum and aseptic workshop processing,turbine machinery and other fields due to its excellent characteristics like no mechanical wear and no lubrication.In order to reduce the complexity of the control system of bearingless switched reluctance motor and improve its efficiency and overload capacity,a novel 12/8 double stator bearingless switched reluctance motor（DSBSRM）is proposed based on the conventional double stator bearingless switched reluctance motor.The proposed structure is composed of outer stator,hybrid rotor and inner stator,the outer stator is used to generate rotational torque and the inner stator is used to generate suspending force.Compared with the conventional motor,the proposed motor can operate in short flux paths,eliminate the reverse flux in stator yoke during the commutation of the torque windings,reduce the core loss and improve the efficiency.At the same time,the magnetic measures in the hybrid rotor of the proposed motor lead to better decoupling characteristics between torque and suspending force,which simplify the control method.To verify the proposed motor,the structure and working principle of the proposed motor are introduced in detail firstly.Based on the research results of bearingless motor,the structure parameters of outer stator,hybrid rotor and inner stator are designed.Secondly,the characteristics of conventional DSBSRM and proposed DSBSRM are analyzed and compared by the finite element method.The results show that the proposed motor has better decoupling characteristics,lower core loss and higher efficiency,which verifies the validity of the proposed motor.Finally,the finite element static simulation results of the proposed motor are used as the reference data of dynamic simulation,and the speed control model and suspending force control model of the proposed motor are established in MATLAB/simulink.Dynamic simulation experiments are carried out under different operating conditions,the results show that the motor works well,and torque and suspension force control are decoupled,which proves the effectiveness of proposed structure.