On Improvement of the Harmonic Composition of the Magnetomotive Force of Fractional Tooth Windings

Abstract Fractional tooth windings of synchronous electric machines with magnetoelectric excitation and a number of slots per pole and phase that is less than one, in addition to the working harmonic of the magnetomotive force, create a number of harmonics not involved in energy conversion. There are various ways to improve the harmonic composition of the magnetomotive force of such windings. The use of two identical windings shifted relative to each other by a certain angle can be mentioned as the most efficient. The article presents a harmonic analysis of the magnetomotive force generated by a fractional tooth winding consisting of two elementary windings.