Abstract
THE PURPOSE. The asynchronous electric motor with a squirrel cage rotor is widely used in the electric driven industry and agricultural machinery. One of the possible ways to improve its energy characteristics is to use a combined 12-zone stator winding instead of the standard 6-zone one. However, in a combined winding with a parallel connection of the «star» and «delta» phases, the phases may not be loaded equally. Therefore, the main purpose of the work under analysis is to study the distribution of currents between the phases of the «star» and «delta» in the asynchronous motor with a combined winding.METHODS. The study was performed on the AIR71V4 engine, rewound onto a combined winding, in which the real ratio of the active resistances of the «delta» and «star» turned out to be 7% less than the theoretical one. The tests were carried out in no-load and short-circuit mode when powered from a three-phase network, as well as in short-circuit mode when one of the line wires is broken.RESULTS. The work gives the values of the currents flowing through the phases of the combined winding. For the experimental sample, the deviation of the obtained currents from the theoretical values is determined. Equations of currents are obtained when one of the linear wires is broken. Schemes for switching on the main contacts of a thermal relay for a motor with a combined winding are proposed.CONCLUSION. The results of the study showed that in an asynchronous motor with a combined winding, in which the real ratio of the active resistances of the «delta» and «star» is less than the theoretical one, the current is not proportionally distributed over the phases. The most preferred circuit for switching on a thermal relay is one in which its main contacts are connected to the «delta» phases, and the thermal relay must be three-pole.
Highlights
For citation: Martynov KV, Panteleeva LA, Vasiliev DA, Dresvyannikova EV
Scheme of a single-layer combined 12-zone зонной обмотки экспериментального winding of an experimental motor электродвигателя
Дресвянникова Елена Владимировна – канд.техн.наук., доцент, доцент кафедры «Энергетики и электротехнологии», Ижевская государственная сельскохозяйственная академия»
Summary
Исследования проводились на асинхронном электродвигателе АИР71В4 с номинальной мощностью 0,75 кВт, в который была уложена совмещённая 12-зонная обмотка (рис. 2). Исследования проводились на асинхронном электродвигателе АИР71В4 с номинальной мощностью 0,75 кВт, в который была уложена совмещённая 12-зонная обмотка Перемотка осуществлялась на ЗАО «Удмуртский электроремонтный завод», а обмоточные данные рассчитывались с помощью программы [16]. Из-за округления сечений обмоточных проводов до стандартных значений активное сопротивление фаз «треугольника» получилось немногим меньше теоретического, а опытное отношение активных сопротивлений «треугольника» и «звезды» меньше теоретического на 7%. 2. Схема однослойной совмещённой 12- Fig. 2. Scheme of a single-layer combined 12-zone зонной обмотки экспериментального winding of an experimental motor электродвигателя. В таблице 1 приведены некоторые обмоточные данные совмещённой обмотки экспериментального электродвигателя
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