SU1239795A1 - D.c.electric machine - Google Patents

Abstract

The invention relates to the design of electric, direct current machines of low and medium power. The aim of the invention is to increase the specific power by increasing the fill factor of the core of active materials. The machine contains hollow measles, made of a set of alternating magnetically conducting 1 and conductive plates 2., - isolated from each other, mounted - Fiwx parallel to the axis of the machine and fastened together with tapered end sleeves 4. This design allows to increase the volume of grooves, occupied by conductors, to make rational use of high-temperature insulation varieties. Since the contacting of conductive and ferromagnetic plates is carried out only along a smooth side surface, the concentration of stresses at separate points of the insulation is eliminated, which makes it possible to increase the specific power of the machine. 2 Il. i (Л С 16 15 14 13 12 g Т J 53 L- /. ,, 1,1. / /, /. /. 7/7 /: o xVX /: V // S u t5 77/7 / L 7 / r7; to coagulated FIG.

Description

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The invention relates to electrical engineering, in particular to the design of low and medium power direct current electric machines.

The aim of the invention is to increase the power density by increasing the fill factor of the volume. The core of active materials, FIG. 1, shows a machine section along the axis, a general view of FIG. 2, 2 - individual crustal plates.

An anchor consists of a set of alternating ferromagnetic 1 and copper 2 plates like dovetail, insulated with insulating spacers and a layer of varnish coating of ferromagnetic plates. All plates are mounted on basic insulating washers 3, fixing a uniform internal gap, the plate pack is fixed with the help of lateral conical bushings 4, isolated from the core package by an insulating layer 5, in order to prevent the package from rotating around its axis when the shaft loads The pressure sleeves can be serrated or wavy, and the ferromagnetic and current plates are made with a small variation in length (± 0.5-1 mm), respectively. The pressing forces on the bushes are made and pulled out by a nut 6, screwed onto the machine shaft and a second nut 7 and screws 8, Solder the copper plates having longer protruding cantilevers 9, solder the tires 10, with the help of which the EE1; The connection of the core winding with the collector and among themselves is based on the known closed circuits of the core windings. It is possible to manufacture copper plates together with busbars. On the outer surface of the core there are grooves 11, into which an additional band of glass fibers or insulated, non-magnetic wire is laid. Grooves 12 are also provided on the inner surface of the core to improve cooling conditions. Inside the core there is a ferromagnetic cylinder (RMO) 13, profiled by the number of poles and intended for closing the main flow. The ferromagnetic cylinder is mounted on the shaft 15 with the help of bearings 14 and is held in a stationary position by the coupling forces with the main magnetic flux. Conical bushings 4 are provided

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fi

0

five

52

narrow grooves 16 for the passage of cooling air into the inner cavity of the core and into the collector hub.

The proposed design allows very quickly, in a few minutes, the assembly, disassembly and replacement of the core package with a pre-wired tire: the tires are removed from the manifold, which can be achieved by practically unscrewing the lock nuts. The shape and dimensions of the ferromagnetic core plates allow them to be annealed in order to restore the magnetic properties in small-sized, laboratory muffle furnaces with a bore diameter of up to 50-60 mm, whereas for annealing standard disc type core plates, large equipment and devices are required. It is impractical to connect along the edges (solder) ferromagnetic and copper plates between one another: with the aim of providing additional current addition to the core winding, since the conductivity

: 1-1

ferromagnetic plates are equal to gg-

the conductivity of copper, and eddy currents increase significantly.

The use of this core construction allows, in comparison with the designs of both a hollow printed core and a ferromagnetic core with stamped grooves, to significantly increase the volume of the slots (their height) occupied by the conductors. Moreover, due to the presence of two air gaps in the two-sided opening of the groove, the scattering fluxes of the conductors can be distributed more evenly and with electric powers of up to 30-50 kW, the transposition of the elementary conductors may not occur. Another prerequisite of this design is the possibility of a substantial increase in the coefficient of filling of the core with active materials — copper and electrical steel in relation to the volume of insulating materials.

The achievement of a high signaling ratio is not possible due to the following design features. Even insignificant bends and breaks of the insulation along the entire active length of the core are absent, which makes it possible to make a strictly rational use of high-quality, high-temperature insulation varieties with good heat-conducting 1

Tyu - mica, its compositions, glazing, thin ceramic spraying, thin layers of high-temperature compositions. The contacting of individual conductive and ferromagnetic plates is carried out only along the smooth side surface of the ferromagnetic plates, which excludes the concentration of stresses. individual points of isolation. This allows the power range of electric machines to be expanded without the use of additional poles with a corresponding increase in the utilization ratio. Thus, the specific MOBACY of the collector electric machine, directly proportional to the magnitudes of the electromagnetic loads, can exceed the specific power of electric machines as with a hollow printed

397954

with the ferromagnetic groove crust approximately 1.5 - 2.5 times.

Claims (1)

5 Formula Shadow Invention An electric current machine containing a stator with an excitation system, poland with a winding, 10 connected to the collector, and a fixed magnetic core placed inside the rotor, which is such that, in order to increase the specific power by increasing  5 of the coefficient of filling the core with active materials, measles is made in the form of a set of alternating conductive and magnetically conductive plates, isolated one from twenty other, installed parallel to the axis of the machine and fastened together with tapered end bushings. Editor R. Tsitsika Compiled by S. Shutova Tehred o.Sopkr Proofreader T.Kolb 3404/53 Circulation 631 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 0IAZ.2