RU1838863C - Asynchronous three-phase electric motor - Google Patents

Abstract

Usage: multiphase asynchronous motors as an electric drive in general industrial application. The inventive asynchronous electric motor contains axially spaced teeth on the stator, made in the form of packets, covered by coils of phase windings, the ends of the teeth on both sides are closed by ring frames, and the coil groups of each phase are made of three coils, the number of turns of which are in a ratio of 4: 7: 4, which simplifies the design and improves the energy performance of the engine. 2 ill.

Description

The invention relates to electrical engineering, in particular to three-phase asynchronous motors with squirrel-cage or phase rotors.

The purpose of the invention is to simplify the design and increase the energy performance of the engine.

In FIG. 1 shows a longitudinal section of a three-phase bipolar asynchronous motor with axially spaced teeth; in FIG. 2 is a diagram of a portion of a stator winding of a motor located on one side of a packet. : The stator of an asynchronous three-phase motor consists of two belts 1 and 2, which are rings wound from electrical steel tape, and teeth 3, on which parts of the winding 4 and 5 are placed. Under the teeth, in the area free of windings, there is a rotor 6 The number of teeth is 12p. The phase windings of the motor are shifted relative to each other by 120 el, degrees, and consist of each of 2 p coil groups (Fig. 2), the latter are spaced apart by

180el hail, and are included among themselves sequentially and counter. Each reel group consists of three coils located on adjacent teeth and connected in series according to which the number of turns in which are in a ratio of 4: 7: 4. The winding of each of the phases consists of two identical parts 4 and 5, placed at the opposite ends of the teeth in the axial direction, and both parts of the winding are interconnected in series.

According to the calculation, the ratio of the amplitude of the main (first) harmonic component of the MDS to the amplitudes of the fifth and seventh was 259.6; winding coefficients for the indicated higher harmonics of the MDS are 51.9 times less than the winding coefficient for the fundamental harmonic, which is more significant compared to the prototype. For this reason, the proposed engine in comparison with the prototype has better energy performance, namely: higher efficiency, better starting

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properties and lower level of magnetic vibration. In addition, the design of the motor is simplified, since the coil groups of the stator winding consist of three sequentially connected coils (in the prototype of four) and half of the total number of teeth are coils belonging to only one of the phases. The latter increases the maintainability of the proposed engine.

Claims (1)

SUMMARY OF THE INVENTION An asynchronous three-phase electric motor with a stator containing 12p axially spaced teeth made in the form of packets, the ends of which radially form a bore. 0 5 curator, on the one hand closed by an annular ring, phase windings consisting of 2P coil groups spaced 180 el apart from each other. degrees and connected between each other in series, and the coils forming the coil groups are connected in series according to and placed on a number of located teeth, characterized in that, in order to simplify the design and improve energy performance, the ends of the teeth on the other hand are also closed by an annular ring, and the coil groups of each phase are made of three coils, the number of turns of which are in a ratio of 4: 7: 4, where P is the number of pole pairs. i and - j .  & OSH &. l -0 # oz Editor fi & 2 Compiled by T. Kalashnikov Tehred M. Mbrgenthal Corrector M. Samborska 1 4 srig. { osh -0 # oz /