SU888275A1 - Single-phase induction motor - Google Patents

Description

I

This invention relates to electrical. and can be used, for example, in the production of single-phase electric motors for driving household appliances.

Single-phase asynchronous electric motors with a pole-pole stator are known, whose magnetic circuit contains sections with different resistance to a variable magnetic flux. ku, and laminated magnetic shunts tl. The engine has bearing shields, a short-circuited rotor and windings located at the poles.

The disadvantage of such an engine is the complexity of the design due to the presence of shunts and bearing shields.

The closest to that described by technical sufficiency is a single-phase asynchronous motor, where to create a rotating magnetic field, the adjacent poles with the adjacent parts of the magnetic core are made of steels with different coercions. 2. The engine contains a winding and a short-circuited rotor, fortified on the bearing shields.

The disadvantages of the engine are the complexity of the design associated with the presence of bearing shields and with the implementation of the stator of the elements laminated from different grades of lithium steel. In addition, areas collected from steels with different coercive forces are included in the motor magnetic circuit in series, which leads to a decrease in the phase shift

15 magnetic fluxes in adjacent poles and to a decrease in torque.

The purpose of the invention is to simplify the design and increase

20 engine torque.

Claims (3)

The goal is achieved by the fact that in a well-known single-phase asynchronous motor containing a rotor and a stator with magnetic conductor including rmo and poles, the adjacent poles are made of a material with different coercivity and the instructor of the stator is made of separate parts of the U-shaped form, the parallel of which they form poles, and the transverse ones are the rm, and the poles and rmo of each U-shaped part are made of material with the same magnitude of coercive force. The U-shaped parts of the stator magnetic circuit may be located on opposite sides of the rotor in planes passing through the longitudinal axis of the engine and shifted in a simple manner relative to each other. U-shaped parts of the stator magnetic circuit can be fastened together with a bracket of non-magnetic material. At least one U-shaped part of the stator magnetic circuit can be made pressed of ferromagnetic powder material. In FIG. 1 shows the proposed single-phase asynchronous motor, front view; in fig. 2 - the same top view; in fig. 3 the same, side view. The stator magnetic core of a single-phase motor consists of separate parts of a U-shaped form. As an example, the motor is shown, the stator magnetic core is made of two U-shaped parts. One U-shaped part of the magnetic circuit consists of opposite poles 1, filled together with rm 2 from a material with a small amount of coercive force, for example, from ordinary electrical steel sheet or pressed out of iron powder with a low content of impurities without a binder. The other P-shape consists of the opposite pyluses 3 which are made integral with the k k from a material with a large amount of coercive force, for example, from high-strength sheet steel or extruded from iron powder with a high content of impurities and bonding. The poles with their closure rims are located in planes passing through the longitudinal axis of the engine and sdut (x in space at a certain angle. In this case the opposite sides of the rotor are located. 54 The engine has two windings 5 and 6 located at both poles and on frames. The shaft 7 of a short-circuited rotor 8 rotates in bearings 9 located in opposite frames 2 and t. To simplify the drawing, parts of the windings are shown schematically. Neighboring poles with closing frames are fixed with a nonmagnetic material bracket, for example, magnetic steel or plastics (to reduce dissipation). The stator windings are wound around the poles and the frame so that the magnetizing forces of the parts of the windings located on the poles and the frame are folded. The described motor has no bearing shields. Magnetic-conducting frames perform the role of the bearing shields The magnetically conducting elements can be made extruded from a ferromagnetic powder. The complexity of manufacturing such an engine is reduced by 1.5-2 times. Magnetic stator circuits (two pairs of poles with roms are made of the same material without technological gaps. This allows to increase the phase shift of magnetic fluxes in adjacent poles and thereby increase the motor torque, reduce the magnetizing current. Formula of the invention, Single-phase asynchronous motor containing a rotor and a stator with a Mai-conductor, including rmo and poles, the adjacent poles are made of a material with different magnitude of the coercive force, characterized in that, in order to simplify its design and increase rotation luminant moment magnetic stator formed of separate parts in U-shape, parallel parts which form the pole and are transverse yoke, the pole and the yoke of each U-shaped portion formed of a material having a coercive force of equal magnitude. 2. An engine according to claim 1, characterized in that the U-shaped parts of the stator magnetic circuit are located on opposite sides of the rotor in planes passing through the longitudinal axis of the engine and displaced relative to each other. 3. The engine according to Claims 1 and 2, characterized in that the U-shaped parts of the stator magnetic circuit are fastened together with a non-magnetic material bracket. k. The engine on the PP. 1-3, which is based on the fact that at least one U-shaped part of the magneto88275 stator wires are made of pressed ferromagnetic powder material. 5 Sources of information taken into account in the examination 1. USSR Author's Certificate No. 158336, cl. N. O. K 17/10, 1963. 2. USSR author's certificate 10 No. 78IZ, cl. H 02 K 17/10, 19i9. / / X -at 1 fuz.Z one FIG. 3