AC motors and generators with six-phase stator windings

摘要

Various patterns of armature windings (3-phase or 6-phase) of electric induction motors and generators are evaluated with respect to increasing motor parameters and diminishing costs of frequency converter. The advantages of nonsymmetric phase spatial distribution of 6-phase winding are shown. Calculated space harmonics of magnetmotive force (MMF). Performing of lab tests of 50 kW 3-phase and 6-phase motors. Elimination of 3rd, 5th, 7th spatial harmonics of MMF in motors and generators. It causes increasing the efficiency of 50 kW motor by 0.4%. Design and manufacturing of motors of large output (> 1000 kW) for inverter fed and low voltage (< 100 V) medium output motors (especially permanent magnet motors) due to easier winding coil manufacturing, as well as better parameters of ready made machines. Clearly showing advantages of 6-phase machines confirmed by results of lab tests.