SU1728938A1 - Two-speed asynchronous motor - Google Patents

Abstract

The invention relates to electrical engineering. SUMMARY OF THE INVENTION: The magnetic system of each part of the stator rotor has two diametrically located protrusions with Ш-shaped magnetic conductors, the phase windings are divided into half-windings, which are placed on the выступ protrusions and middle projections of the-shaped magnetic conductors. 2 Il.

Description

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WITH

The invention relates to electrical engineering, in particular to the construction of a multi-speed asynchronous motor, and may find application in motors for household appliances, in particular, in electric motors for domestic fans.

Single-phase asynchronous electric motors are known that contain a stator with four clearly pronounced poles, two of which are partially covered by short-circuited coils, windings in the form of coils located at each of the poles, and a rotor with a short circuit. winding. In order to obtain two frequencies of rotation of the rotor, the coils have two variants of connections with each other.

The closest in technical essence to the present invention is a two-phase two-speed asynchronous electric motor of the end type, containing a stator consisting of two disk parts, one of which is shifted relative to the other by 60 el. hail

Each part has six clearly expressed poles with phase windings made in the form of pole-selectable concentrated coils fixed on the indicated poles, and a rotor located between them with a short circuit. winding.

The disadvantages of this engine are the increased costs of active materials and low torque at higher speeds. The increased costs of copper windings are due to the fact that in half of the lying coils located at different poles, the currents have opposite directions and the magnetomotive forces generated by them compensate each other, thus a part of the copper windings located in the motor does not create a dns ., i.e. not used.

The aim of the invention is to reduce the cost of active materials and increase

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torque at higher speeds.

The goal is achieved by the fact that

In a two-speed asynchronous electric motor comprising a two-part stator with a six-pole magnetic system with phase windings on each of the parts and a rotor located between said parts of the stator, the magnetic system of each part of the stator is equipped with H-shaped magnetic conductors with pole lugs, the magnetic system of each parts of the stator stator are made with two diametrically located protrusions on which the W-shaped magnetowires are fixed, and the phase windings are made in the form of semi-windings, which are placed on ystupah secondary yoke and the pole projections SH- shaped magnetic cores, wherein said poluobmotki phases included under-sequentially.

This arrangement of the coils of the windings on the magnetic core, having the specified configuration, leads to the fact that the stator does not have coils with currents of opposite direction in the sides located near (which is in the prototype), due to which the entire amount of copper stored in the engine is most fully used . Also, when the semi-windings of the phase coils are sequentially switched on, which corresponds to the higher rotational frequency, the amplitude of the first harmonic of the induction in the gap increases, which leads to an increase in the engine torque. When the ampere-turns (ppm) are preserved in the phase, as compared with the prototype, the moment increases approximately 2-3 times.

Figure 1 presents the proposed two-speed synchronous motor, scan; figure 2 is a part of the magnetic circuit and plots ppm

The engine contains two parts of the stator 1, shifted one relative to the other by 90 electr., The magnetic circuit 2 of each of which contains a PMO 3 with two diameters 4 and 5 located diametrically opposite to which the W-shaped magnetic cores 6 are attached, protruding parts 7 of which are poles, and

phase windings, made in the form of lumped coils 8 and 9, are placed on protrusions 4 and 5 and middle protrusions 7 of W-shaped magnetic circuits 6, and a disk short-circuited rotor located between the parts of stator 1. When the coils 8 and 9 are consistently turned on, bipolar magnetic field 11, and with a counter-switching - six-pole field 12.

The proposed engine works as follows.

On the phase windings of the engine, in which each phase winding, is located on one of the parts of the stator 1 ,. consists of

connected in series coils, an alternating voltage is applied, which creates a rotating magnetic field in the engine air gap. The interaction of this field with 10 currents induced in a short-circuited rotor leads to the appearance of a torque. If coils 8 and 9 are agreed to turn on to create a bipolar field, the electric motor has a synchronous rotation frequency of 3000 rpm. The counter-switching of the coils permits a six-pole field and a synchronous rotor speed of the electric motor of 1000 rpm.

Claims (1)

DETAILED DESCRIPTION OF THE INVENTION A two-speed asynchronous motor comprising a two-part stator with a six-pole magnetic system and phase windings on each of the parts, a rotor located between said parts of the stator, characterized in that, in order to reduce the cost of active materials and increase torque at the highest frequency of rotation, it is equipped with W-shaped magnetic conductors with pole protrusions, the magnetic system of each part of the stator ма s frame is made with two diametrically located protrusions on which W-shaped magnetic cores, and the phase windings are made in the form of semi-windings, which are located on the protrusions of the chassis and the middle pole projections of the W-shaped magnetic circuits, and the indicated half-windings of the phases are connected in-series. Xz b 3 7 eleven 6385 10 / J / / L N 1  G 1 TA i / g J /