Comparison of the electromagnetical performance of simplex wave and lap windings

A main feature of modern DC machines should be little maintenance. Improved commutation with reduced brush wear is therefore necessary. A comparison of simplex wave and lap windings is carried out, concerning good commutation. Wave windings need lower numbers of turns per armature coil than lap windings for the same rated motor data, which enables motors to reach longer operating intervals between brush exchange. Thus wave windings should be preferred in spite of higher brush load due to equalizing currents, and preferably excited slot-frequent shaft bending vibrations