UA82637C2 - Method for manufacturing rotor of asynchronous motor - Google Patents

Abstract

A rotor of a magnetic conductor is assembled of sheets made of steel having a high saturation induction, for example, iron-cobalt (49K2A). Rods of both cages, which installed in magnetic conductor slots are made of copper. The rotor is annealed at temperature of magnetic conductor steel annealing, for example (820±10)°С. The asynchronous motor with rotor manufactured in such a way has enhanced energetic characteristic, enhanced performance, enhanced start at saving start current and mass and dimensions of industry analogue.

Description

Description of the invention

The invention relates to electrical engineering, in particular, to the technology of manufacturing rotors and can be used in the development and manufacture of asynchronous motors.

There are known designs of rotors with two short-circuited windings, one of which is the starting (upper) one made of brass, the other - the working (lower) one - made of copper, which are used to improve the starting characteristics of asynchronous motors |11.

During the manufacture and assembly of two-cell rotors with brass and copper rods, the magnetic properties of the electrotechnical steel of the magnetic conductor deteriorate as a result of repeated mechanical effects on it during stamping (appearance of defamation) and dense installation of the rods in the grooves of the magnetic conductor, deformation during welding of the rods and short-circuit rings and mechanical processing of the assembled rotor. At the same time, there are not enough reliable connections in places where dissimilar materials are welded, because brass has a lower melting point than copper, and during welding, the melting of brass rods occurs 12 times earlier than the melting of copper rods and short-circuit rings.

In order to reduce the overall dimensions of electric machines and increase their energy characteristics for the magnetic conductors of the stator and rotor, instead of siliceous electrical engineering steel (2) with a working induction range of up to 1.6-1.8 T, iron-cobalt steel of type 49K2FA |Z) with a working induction range of up to 2 ,3 Tl.

Iron-cobalt steel is supplied without heat treatment, and if the assembly and mechanical processing of rotors with both a single aluminum cage and two-cage rotors made of previously heat-treated sheets are carried out, then, as experimentally established |4), the magnetic properties of this steel deteriorate significantly, practically not differing from properties of siliceous steels.

Cobalt alloys have increased sensitivity to mechanical influences, one of the ways to reduce it is heat treatment, which is carried out in a package and is carried out in a vacuum at a temperature of approximately 830296. s

Rotors made of iron-cobalt steel with a single aluminum cage, which are used at this time, are made from pre-heat-treated sheets, since it is not possible to anneal them into assemblies due to the fact that the annealing temperature of steel is (820 -10)a9C, which is above the melting point of aluminum.

It is not possible to make a rotor made of iron-cobalt steel with a double cage with rods made of brass and copper, followed by annealing into assemblies, because when connecting the rods and short-circuiting rings and soldering with known high-temperature hard solders, when the rotor is fired, the solder melts, and when "joints by welding - the rupture of brass rods in the grooves of the magnetic conductor in connection

WHEREAS p, brass at an annealing temperature close to zero (5). what

The invention is based on the task of improving the manufacturability of the rotor by increasing the reliability of welded joints and improving the energy characteristics of the electric motor. with

The task is solved by the fact that in the manufacture of a two-cage rotor of an asynchronous motor, the magnetic conductor is made of sheets made of steel with a high saturation induction, for example, iron-cobalt (49K2FA), the rods of both cages, which are installed in the grooves of the magnetic conductor, are made of copper, "the assembled rotor types are subjected to annealing at the annealing temperature of the magnetic conductor steel, for example, 40. (820410)2C. - c Making the rods of the launch cage from copper allows you to reduce their diameter in comparison with the rods from "" brass, to perform in the rotor sheet the upper row of grooves of a smaller size in comparison with the sizes of the grooves under the " brass rods, to raise higher (by a larger diameter) the row of grooves of the lower of the cage, which contributes to the reduction of induction in the area of the upper and lower cages due to the increase in the width of the teeth, reduces the reactive component of the current, increases the efficiency, efficiency and power of the engine, allows you to fire up the assembled rotor (without a shaft). co As the tests showed, the starting moment of the 3.5 kW asynchronous motor with a rotor manufactured by the proposed method increased by 3095 while maintaining the starting current, and the efficiency increased by З95 compared to the iron-cobalt steel rotor with a single aluminum cage assembled in advance ( 22) heat-treated sheets, i.e. sheets that were subjected to annealing to charge on the mandrel and pouring with 20 aluminum.

With an increased width of the teeth of the rotor with copper rods of the starting cage and the value of induction, which corresponds to the rotor with brass rods, there is an opportunity to acquire a higher power engine with the same mass and dimensional characteristics.

The claimed invention is novel because it is not known from the prior art, industrially applicable because 22 is intended for use in asynchronous motors. o Thanks to the proposed method, a new technical result was achieved, which consists in the fact that the asynchronous motor with a rotor manufactured by this method is distinguished by improved energy performance characteristics, increased starting torque while maintaining the starting current and mass-dimensional indicators of industrially mastered analogues, and increased manufacturing technology rotor for the use of such an electric motor in electrically driven pumping stations of hydraulic systems of aircraft AN-148,

IL-96-300, BE-200 made it possible to increase the reliability of the start-up with possible reductions in the supply voltage and at negative ambient temperatures.

Sources of information used: 1. Antonov M.K. Technology of assembly of electrical machines and devices. - Moscow: Higher School, 1986. - 288 p. bo 2. GOST 21427.2-83 Electrotechnical cold-rolled anisotropic thin-sheet steel. Technical conditions.

Z. GOST 10160-75 Precision soft magnetic alloys. Technical conditions. 4. Getya A.N., Sharaban Y.V., Matusevych V.A. Questions about the application of Re-So steel in electric engines of aviation units// Herald of NTU "Khpy". - 2003- Mo11. - P. 28-35. 5. Handbook of machine-building materials (in four volumes) / edited by G.I. Pohodina-Alekseeva. -

Volume 2. Non-ferrous metals and their alloy!. - M: Mashgiz, 1959. - P.175, fig.27.

Claims (1)

The formula of the invention is the method of manufacturing the rotor of an asynchronous motor, which consists in the fact that in a two-cell rotor, the magnetic conductor is made of sheets made of steel with a high saturation induction, for example iron-cobalt (49K2FA), the rods of both cages, which are installed in the grooves of the magnetic conductor, are made of copper, the assembled rotor is subjected to annealing at the annealing temperature of the magnetic conductor steel, for example (820-10)20. Official Bulletin "Industrial Property". Book 1 "Inventions, useful models, topographies of integrated microcircuits", 2008, M 8, 25.04.2008. State Department of Intellectual Property of the Ministry of Education and Science of Ukraine. s o cha (ze) (Se) s Zo so - with . and? so ko (22) o what F) ko 60 b5