Асинхронные двигатели с тангенциальным смещением зубцовых гармоник магнитного поля. Ч. 1. Добавочные электродвижущие силы и потери

Abstract

Обоснован способ снижения добавочных потерь короткозамкнутых асинхронных двигателей использованием роторов с тангенциальным смещением участков стержней разделенных промежуточными кольцами и соответственно со смещением гармонических составляющих магнитного поля, вызванных зубчатостью активных поверхностей и дискретностью распределения обмоток. Приведено выражение коэффициента ослабления гармоник поля при тангенциальном смещении участков стержней и зубцов магнитопровода.

Purpose. Presentation of way to improve additional active power losses of induction motor with partitioned magnetic core and rotor winding with intermediate squirrel-cage rings by tangential shift of higher harmonics of magnetic field, which were caused by tooth components of air gap conductance and discrete distribution of winding. Methodology. The proof of compensation effect of higher components of electromotive forces is based on the analytic method of specific conductivity of air gap. Results. The possibility of mutual compensation of electromotive forces from tooth higher harmonics by shift of parts of teeth and bars by proportions of teeth segmentations has been shown. Formula of tangential displacement of rotor winding has been derived. Originality. At present, the tendency of reducing active power losses of electrical machines is a reduction of electromagnetic loads and an increasing the length and material consumption of machine, which is contrary to requirement of resource conservation in the construction of electrical machines. But the way, which is proposed in this article, is implemented by shift of teeth and parts of winding bars in adjacent sections of rotor magnetic core. Practical value. The practical reduction of electromotive forces from tooth harmonics of gap conductivity and magnetomotive forces is achieved by mutual shift by a quarter (half) of tooth division of two symmetrical rotor sections, each of which is consisted of two half-shifted (quarter) tooth segmentation parts.