SU752632A1 - Protective shield for electric-machine rotor superconductive exciting winding - Google Patents

Description

The invention concerning the electromachine construction H can be used in rotors of electric alternating-current machines with superconducting winding of excitation. To erase the superconducting excitation winding of the rotor from the nepeMetmbix composition. The magnetic fields created by the current of the core and from the radial heat sources flowing through the gap with the rotor and the stator, across the superconducting excitation winding, place the electromagnetic and electrothermal screens of various designs. A rotor of an electrical machine with a superconductor ayu excitation winding with a protective screen is known, having either a single-layer structure in which a screen tube of a conductor of electrically conductive material or a multi-layered structure in which thin-walled tubes of a screen of electrically conductive material alternate with coaxial thin-walled tubes VH3 of a non-magnetic material, or KCHcapyiciiHio 9kl) aka, representing MOHonifT dbm of the non-magnetic winding of a non-magnetic material, or the screen is set to Balu Pa ( BOKpjT turns turning gears 1) w y. . The disadvantage of screen erections is on the view of the wall and the complexity of izgotoshgena, since screening requires the insertion of a small screen for 1) H of highly conductive material or the thinning of thin walls of the first tube diameters with the provision of alternating landings of coaxially arranged pipes. IvBeste is also a protective shield of the superconducting excitation winding of the electric rotor, containing a tubular frame made of nonmagite material and a pipe made of highly electrically conductive material, which is located inside the frame with a dense junction of surfaces and having channels. oh, a fall. 2. The disadvantage of this design is the complexity and, therefore, the high cost of production of high-strength sKjaana for a high-powered machine. In case of a short circuit of the winding of the core, the poTop i screen has a large variable torque of four to ten times, exceeding the rated torque of the machine. Therefore, the screen should be designed to ensure reliable connection of the pipes to each other (the opposing forces of twisting the layers are eccentric relative to each other. The shrinkage of screen welded or forged pipes requires further processing and planting, which is difficult for relatively large diameters and small thicknesses The purpose of the acquisition is to simplify the technology and increase the reliability of the protective screen. The delivered chain is achieved by the fact that the pipe is made of highly conductive material There are tightly compressed turns of cylinders, in which reinforcing elements of a nonmagnetic spring, for example, a tubular material, and cooling channels are located, and the cylindrical surface of the frame, which is conjugated to the surface of the pipe, is made of cotton. elements. In addition, the lateral surfaces of the coils of the spring are made with well developed HNOS1-YAMI, nairimer, in the form of grooves and openings, located in the slots. FIG. i schematically shows the design of the screen, longitudinal section; in fig. 2 on the axial device with axial. in fig. 3 - a variant of the screen with developed lateral surfaces of the coils, a longitudinal section; pa fig. 4 screen with reinforcing elements, continuous section; in fig. 5 - screen with cooling channels, longitudinal section; in fig. 6 - a screen with channels arching elements with a longitudinal section. The protective screen of the superconducting winding of the rotor of the electric machine contains a tubular icapifac i of non-high-strength high-strength material, inside which is placed a pipe 2 of high-electrical conductivity of the material, made in the form of a jraoTHO shrinkable coil of a cylindrical spring from a strip of muhhelel The coyer’s armor is a spring-loaded, non-magnetic material 3, for example tubular m and has channels 4 for cooling the protective screen. The presence of a developed surface of the lateral sides of the coils (not shown) forming pipe 2 contributes to the enhancement of TeriJiOBOiX) and electrical contact. To compensate for the change in the length of the electrically conductive pipe 2, caused by the rotor being heated and warmed, in structures cooled with refrigerant passing through the channels 4 of the screen, an axial pressure device 5 is provided. In addition, to hold the pipe 2 in the frame 1, In particular, in the interaction of eddy currents with a magnetic field from the action of forces, the pressure rises to destroy and degrade the tsa-aank yutrub 2,. the surface of the frame in contact with the surface of the pipe 2 has a roughness. When the electric machine is in operation, alternating magnetic fields arise in the stator winding (not shown), which violate superconductivity in the excitation winding. In the proposed construction, with a load, the eddy currents arising in the pipe 2 of the protective electrothermal screen shield alternating fields, preventing them from reaching the superconducting winding. Sanitary screened by a coolant circulating through screw channels 4, the electro-electric screen protects the superconducting field winding of the electric machine from radial heat mirrors (not shown) arising from the electric machine and released from the stator winding through the gap to the Bree rotor short-circuit of the winding of the core on the rotor screen acts a large torque, four to ten times the nominal torque of the machine, tends to reach pipe 2 of highly electrically conductive material and Turning it relative to the frame 1, therefore the cylindrical surface of the frame i, in contact with the pipe 2, is made rough, for better adhesion between the frame 1 and the pipe 2, executed in the form of a cylindrical axially tightly compressed in the axial direction, springs (pipes 2),. the diameter of which increases when compressed, which provides the necessary fit and reliable fit with the frame .1. In addition, the longitudinal reinforcement of spontaneous cross-section strips by a nonmagnetic spring material also contributes to the strengthening of the joint between the tube of the frame 1 and the high-conducting pipe 2. The developed side surfaces of the turns of the tube 2 when

tight compression provides improved electric and thermal contact between the coils in the axial direction, which contributes to a better shielding of electromagnetic and heat fluxes, and also increases the honey; anic strength of pipe 2 of highly conductive material

The construction of a custom shield for the superconducting excitation winding of a poi-opa electric tube in a tube of an outer framework and a tube fixed on its inner diameter from a highly electrically conductive material, in the form of a compressed cylindrical nppJCHHMs, significantly simplifies the technology for producing the shield due to the fact that this tube is made of reinforced strips of rectangular cross section, and the necessary fit in the frame with a rough cylindrical surface is compressed, since the diameter of the spring increases in compression, some- does not require planting treatment. cylindrical1 (H. of the appearance and provides a perfect npoijHoe connection of the frame with the pipe on a highly electrically conductive material.

Reinforcing the strip of turns of the pipe with a tubular non-magnetic spring material provides the strength of a tube made of a view-electrophoretic material and cooling the screen with a coolant that is built in along the spiral ducts.

The proposed screen construction can be used both in a dual screen of a superconducting field winding, i.e., for both external electromagnetic and internal elestro thermal.

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invention formula

1c The protective screen of the superconducting winding {1 and the roacher of an electric machine, containing a tubular Kapica from a non-magnetic material and a pipe made from a juice-conducting material, has been cracked inside a karsas with tight junction of the surfaces and has 1 cooling channels, different from In order to simplify technology and increase reliability, a pipe made of highly electrically conductive material is drawn out in the form of plt compressed turns of cylinders. pens, in which reinforcing elements of nonmagneto spring, for example, a tubular material, and cooling channels, are located, and the structural surface of the framework, copiJi; enna with the surface of the pipe, made rough

2. The protective screen according to claim i, which is based on the fact that the cooling channels are located in the reinforcing elements,

3, Zeruyitny screen for W1. 1 and 2, about t-i l and h and y and with the fact that lateral hyper-turns of the spring coil are outfitted with razokty-pe surface, naprpler,

in the wada of the slots if protrusions located 3 tsaz.

Sources of information, taken into consideration in the examination 1. US patent number 3956648 Cl. 3iO.40, 1970.

. 2. ABTOpciioe certificate of the USSR in accordance with the application No. 1972945, cl. H O2 K 9/197, 1973.

five

Claims (3)

Claim 1. The protective screen of the superconducting excitation winding of the rotor of an electric machine, containing a tubular frame made of non-magnetic material and a pipe made of a high-conductive material located inside the frame with a tight interface and having cooling channels, which are different in order to simplify the technology and to increase reliability, a pipe made of highly electrically conductive material is made in the form of plbt-compressed turns of cylindrical springs, in which reinforcing elements are made of non-magnetized spring, on example, tubular material, and cooling channels, and the cylindrical surface of the carcass mating with the surface of the pipe is made rough 2. The protective screen according to claim 1, characterized in that the cooling channels are located in the reinforcing elements. 3. The protective screen for PP. 1 and 2, due to the fact that the lateral surfaces of the coil of the spring are made with developed surfaces, for example, in the vice grooves and protrusions located in YaZZKh, with a dagent circulating through screw tubular channels. The proposed screen design can also be used to give a double screen to a superconducting field coil, i.e., as for an external electro35