Hybrid stator-pole switched reluctance motor to improve radial force for bearingless application

A novel hybrid stator-pole switched reluctance motor (HSPSRM) to improve radial force for bearingless application is presented in this paper. The proposed motor can generate a constant suspending force independent of rotor position only using small current excitation. And torque control can be naturally decoupled form suspending force control. Measured data and the results of numerical analysis are given to evaluate the motor structure. In the numerical analysis, the finite element method (FEM) is employed due to the highly nonlinear nature of the motor. A prototype hybrid stator-pole SRM is manufactured and tested in the experimental studies. The obtained test and simulation results show that the hybrid stator-pole SRM structure has a constant suspending force, which can be controlled independent from torque control.

[1]  Timothy J. E. Miller,et al.  Switched Reluctance Motors and Their Control , 1993 .

[2]  Ferhat Daldaban,et al.  Multi-layer switched reluctance motor to reduce torque ripple , 2008 .

[3]  Sheng-Ming Yang,et al.  An Approach to Producing Controlled Radial Force in a Switched Reluctance Motor , 2007, IEEE Transactions on Industrial Electronics.

[4]  C. Broche,et al.  Calculation of the electromagnetic parameters of a switched reluctance motor using an improved FEM-BIEM. Application to different models for the torque calculation , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.

[5]  Sheng-Ming Yang,et al.  Instantaneous Shaft Radial Force Control with Sinusoidal Excitations for Switched Reluctance Motors , 2007, IEEE Transactions on Energy Conversion.

[6]  Wilfried Hofmann,et al.  Analytically Computing Winding Currents to Generate Torque and Levitation Force of a New Bearingless Switched Reluctance Motor , 2006, 2006 12th International Power Electronics and Motion Control Conference.

[7]  H. Akagi,et al.  Radial force and torque of a bearingless switched reluctance motor operating in a region of magnetic saturation , 2002, Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344).