SU1390717A1 - Device for heating articles with windings - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to devices for drying the insulation of the core windings of collector electric machines. The purpose of the invention is to reduce the duration of the process and improve the quality of the insulation by increasing the uniformity of heating. In the device, the three-phase winding is placed in the grooves of the magnetic circuit, made in the form of the stator core of an asynchronous electric machine, in the teeth of which an annular groove is made, where the coil of the cylindrical inductor is located. The winding of the processed core is short-circuited in a collector ring. The rotating magnetic flux created by the three-phase winding induces a short-circuit in short-circuited sections leading to the heating of the winding, and the core steel is heated by eddy currents induced by the alternating magnetic flux of the cylindrical inductor. The device allows you to get a uniform on; heat insulation 1 hp f-ly, 1 ill. i (L

Description

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This invention relates to electrical engineering, in particular, to devices for drying the insulation of Korean coil collector electric machines.

The purpose of the invention is to reduce the duration of the process and improve the quality of the insulation. By increasing the heating uniformity when drying the insulation of the windings of the collector machine cores.

The drawing shows a diagram of the proposed device.

The device comprises a housing 1 with a thermally insulated external surface. A cylindrical magnetic core 2 mounted on its inner surface is made in the form of a stator core of an asynchronous electric machine, in the grooves of which a three-phase distributed winding 3 is placed. whose length is 0.28 to 0.31 of the length of the grooved portion of the core. The magnetic core 2 and the coil 5 are symmetrical with respect to the middle section of the core of the core 6 of the electric machine. The contact device (ring) 7 is a copper bus with a soldering 8 of the brush wire on the surfaces in contact with the collector, which ensures a uniform and reliable electrical contact.

At the bottom of the housing 1, a stand 9 is installed, having, like the cover 10 of the housing 1, a clamp 11 for fastening. No shaft ends of the core 6, which ensures the alignment of the core and the device, and also prevents possible movements during the heat treatment process.

The parameters of the cylindrical inductor and the three-phase winding 3 are determined by the structure of the core and, for example, for. The engine core NB-418K6 has the following meanings.

Cylindrical inductor: voltage 127 V; current 120 A; the number of turns 40; power 6.5 kW.

Three-phase winding: winding type - wave, connected according to scheme Y ;; voltage 380 V; number of poles 6, current 200 A; power is 15,3 kW.

The device with the parameters provides an almost uniform insulation heating along the length of the sections about

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hanks to drying temperature (160 ° C) for 0.5 h.

The device works as follows.

A shorting ring 7 is placed on the collector core 6. Then the measles 6 are placed upwardly on the stand 9 by the collector 9. The heat treatment chamber is closed with a claw 10, the shaft 6 is fixed by locks 11. frequency 50 Hz) voltage.

The magnetic flux of a cylindrical inductor, having a preferential direction along the axis of the core 6, induces eddy currents in its ferromagnetic core, heating it to the required temperature. The three-phase winding 3 creates a rotating magnetic flux, inducing a short-circuit in short-circuited coils of the winding, the ohmic losses from the flow of which in copper serve as a heat source when drying the insulation.

In the process of heating and heat treatment, a constant temperature control in the frontal and groove parts of the winding is carried out, on the basis of which the voltages of the cylindrical inductor and the three-phase winding are adjusted. When the drying temperature is reached, the sources of the electromagnetic field are switched to the intermittent operation in order to maintain the required insulation temperature. When using the proposed device, the heat treatment time is reduced by 4-4.5 times. Energy savings by reducing drying time, for example, for the NB-418K6 electric motor, will be on the order of 400 kWh.

Claims (2)

1. Device for heating products with windings, comprising a cylindrical inductor containing a laminated magnetic circuit with an annular groove and an inductor located in the annular groove of the laminated magnetic conductor, in order to reduce the duration of the process and improve the quality of the insulation by to increase the uniformity of heating when drying the insulation of korea collector electric machines, it is equipped with a contact device for shorting the winding of the core over the collector, laminated magnetic circuit Execute the additional longitudinal grooves and provided with three-phase distributed winding disposed in slots prodolnps magnetic laminations. 2. The device according to claim 1, on. t l and often because the laminated magnetic circuit is made with the number of poles equal to the number of poles of the collector electric machine. ///////// /////// / //// At ////// ////////// .