Finite-Element Analysis about Coupling Characteristics of Electromagnetic Force of a Bearingless Switched Reluctance Motor

A bearingless switched reluctance motor of 12/8 structure was used to explain the production principle of suspending force.A finite-element simulation model of the sample motor was established and coupling characteristics of electromagnetic forces were analyzed by MAXWELL2D,including radial coupling characteristics of suspending force on two degrees of freedom,coupling characteristics between suspending force and electromagnetic torque. Moreover,the effects on coupling of electromagnetic forces caused by radial displacement of the rotor were also analyzed.The analysis results show that the radial coupling of suspending forces mainly appears at initial overlapping positions;the coupling effects of torque adjustment on suspending force is the main factor in coupling characteristics between suspending force and electromagnetic torque and the radial displacement can affect the radial coupling of suspending forces to a certain extent.The results can provide useful references for motor's optimization design, mathematical model research and decoupling control design.