Finite element analysis of low-speed double disks type permanent magnet synchronous machine

A low-speed double disks type permanent magnet synchronous machine is proposed. The electrical machinepsilas stator slot number is close to the rotor permanent magnet pole number and the statorpsilas tooth width is close to a pole distance. The coils that belong to each phase are concentrated and wound on consecutive teeth, so that the end winding is minimal and the phase windings do not overlap. It is conductive to stator cooling and reducing the moment of inertia by using the structure of double stators on two sides and single rotor in middle. Electrical machinepsilas stator is fixed on the end cover and the rotor magnetism pulling force on two sides can balance each other, so that the axial force has no effect on the bearing. The axis length of this machine is smaller than conventional machines, but motorpsilas power density is improved. A prototype had been analyzed and the calculated result proved that phase electromotive force (EMF) of three phase stator winding is better. The amplitude of harmonic torque and cogging torque are very low in this kind of machine, so stability is improved while the machine is running at a low-speed.