Designing of High Speed Permanent Magnet Electric Machines with Rotor Strength Verification

Abstract

The paper is devoted to the design of high-speed electric machines with magnetoelectric excitation, taking into account the required electromagnetic and strength parameters provision. The active part sizes of such machines highly depend on electromagnetic loads – magnetic flux density in the air gap, armature line current density. Magnetic flux density, in turn, is a function of the non-magnetic gap magnitude between the rotor and the stator, which is determined by the thickness of the used permanent magnet (PM) sleeve mounted on the rotor surface. The finite element method is used to study the strength characteristics dependence - mechanical stresses and rotor elements deformation on the method of fixing the PM: glue, sleeve, glue and sleeve at the maximum speed of the autonomous mobile object motor-generator. The magnetic flux density in the gap is verified by the finite element method. guidance’s are given on the choice of the method of fixing the SPM on the rotor and the thickness of the carbon fiber sleeve.