A NOVEL HYBRID EXCITATION DOUBLE-STATOR BEARINGLESS SWITCHED RELUCTANCE MOTOR

In view of lower power density and being unable to produce big radial force, this paper presents a new design of the hybrid excitation double-stator bearingless switched reluctance motor, which combines conventional double-stator bearingless switched reluctance motor (DSBSRM) with rareearth permanent magnetic materials of high performance. Firstly, the basic structure and principle of the hybrid excitation DSBSRM are introduced. Secondly, the electromagnetic analysis is performed on the motor by two-dimensional finite element analysis (2D FEA), and the comparison is made between the proposed motor and traditional DSBSRM. Thirdly, the magnetic equivalent circuit (MEC) is established to deduce the mathematical models of the radial suspension force, torque and inductance. The current stiffness coefficient and displacement stiffness coefficient are derived by linearizing the mathematical models. Finally, the mathematical models are proved to be correct by 2D FEA.