Analysis of the benefits of using 6-phase windings in motors excited with permanent magnets

The electric motors with the number of phases (m > 3) are dedicated to power supply from inverters. The article concerns permanent magnet motors with a 2 x 3-phase winding with a phase shift of 30 degrees. The windings are supplied with 2 x 3-phase voltage temporarily shifted in relation to each other by the angle pi/6=30 degrees. Motors, in relation to the 3rd and 6th phase symmetrical winding, achieve a higher rated torque and compensation of harmonics of magnetomotive force (MMF) of the armature theta(mu) for mu = 5, 7, 17, 19, 29, 31, which results in lower power losses, lower pulsations of the electromagnetic torque, lower magnetic noise and lower vibrations. Such motors are recommended primarily for use in servo drives.