Análisis de la Deformación Del Campo Magnético Rotacional Causada Por Armonicos Homopolares en Motores Trifásicos Con Saturación

Abstract

This article analyzes the deformation of the rotational magnetic field in three-phase motors, caused by the presence of zero-sequence harmonics in the current and the effect of ferromagnetic material saturation. Zero-sequence harmonics contribute to core saturation and the deformation of flux density waves, generating positive and negative sequence harmonics. It is highlighted that the saturation of the ferromagnetic material gives the field a hexagonal shape, moving away from the ideal circle described in classical literature. It is concluded that, although the presence of zero-sequence harmonics in the current is allowed, they do not affect the rotational magnetic field directly, but their presence generates distortions in the flux densities due to core saturation, which creates additional harmonics that deform the trajectory of the rotational magnetic field in addition to the hexagonal shape generated by saturation. The machine model and the evaluation of the rotational magnetic field are performed in Matlab Simulink using the Clark transform.

Keywords

• campo magnético rotacional
• armónicos homopolares
• saturación
• deformación
• motores trifásicos.