DESIGN FEATURES OF AXIAL FLUX ELECTRIC MOTOR FOR AIRCRAFT PROPELLER

Abstract

In this paper the radial and axial design of an electric motor with a speed of 2700 rpm, a torqueof 250 Nm and air cooling is compared. Calculations were carried out using Ansys ElectronicsDesktop and Ansys MotorCad by the finite element method in 2D and 3D. It is shown that the axialdesign allows to increase the specific power by 30%. The design of the axial motor is describedin details. The problems associated with the deformation of the rotor related to magnetic attractionforces are described. The design of the rotor, which makes it possible to reduce losses in permanentmagnets and the magnetic circuit of the rotor to an acceptable level is described. The influenceof slot opening, segmentation of permanent magnets on the level of losses in the rotor is described.The design of the active part of the stator, which does not have a magnetic circuit yoke, is described,as well as the advantages that such a design has over the variant with a yoke. The materials thatcan be used for the stator tooth, as well as the difficulties associated with the layout without a yoke,are described. The selection process of the slots number according to a combination of various criteriais presented. The criteria are: the mass of the teeth, the shape of the linear EMF, the level of lossesin the rotor, the phase inductance, the cogging moment, the winding factor. The efficiency of the aircooling system, in which the movement of the refrigerant occurs due to the rotation of the rotors,is substantiated, and the results of the thermal calculation are shown.