Electric machine

FIELD: electricity.

SUBSTANCE: electric machine includes case with end screens, housing a laminated stator core with slots where winding coils are located and fixated by wedges, with rotor positioned inside stator cavity and including inducer actuating poles, permanent magnets, no-magnetic wedges and shaft, so that rotor length exceeds inducer length. Rotor end sections are made in the form of cylindrical bushings out of non-magnetic material, flush-mounted on external surface of inducer, rotor bearing unit allows for static gas and dynamic gas support, and for that purpose external rotor features cylindrical surface and is positioned inside cylindrical cavity of the bushing fixated in the stator cavity with gas supply for stator surface cooling, while case cavity has cooling gas supply and drain, and for that purpose internal surface of the case features longitudinal ducts joining radial ventilation ducts made between stator core stacks. According to invention, stator can be vented separately by at least two pipes in the case for cooling gas supply/drain to/from the case volume occupied by the stator, the bushing has longitudinal lugs matching stator core slots in number, positions and cross-section and fit into the slots, slot vent gap is left between lug surface and slot wedge, lengthwise holes are made in longitudinal lugs of the bushing and connect to radial feed orifices opened into internal cavity of the bushing, cylindrical bushings out of isolating material are installed in the case cavity coaxially to stator core cavity and attached by their ends to the ends of outmost stator core stacks, external surface on the ends facing end screens feature o-ring pairs, and end screen junction with the case is sealed. Cylindrical bushings serve as external cartridges of radial gas-dynamic leaf bearings, and rotor end sections serve as trunnions of the bearings, in addition the electric machine features at least one axial gas-dynamic leaf bearing, and orifices are made in end screens, with orifice inlets connected to lubricating gas source and outputs joining annular slot between o-ring pairs, which in its turn joins longitudinal through holes of the cylindrical bushing. Besides, a screen features pipe connected to separate source of cooling gas and joining permanent magnet cooling ducts formed by slot bottom section and permanent magnet surface facing them, via end sections of inducer, and at the opposite case end the ducts are connected to process gap of axial gas-dynamic leaf bearing which in its turn is connected to gas collector.

EFFECT: efficient cooling of stator winding and core, reduced weight and dimensions, improved service life of electric machines, minimum rotor bend, efficient cooling of permanent magnets, extended rotor stability range due to damping by radial gas-dynamic leaf bearings, prevention of rotor jamming at high circular velocities in vicinity of gas-dynamic leaf bearings.

4 cl, 3 dwg

 

The invention relates to the field of electrical engineering, particularly electrical engineering.

Known high-speed electromachine, comprising a housing which has a capability to supply in its cavity cooling gas, equipped with face shields, and means for supplying a cooling gas to the nodes placed in the cavity of the housing, the stator core with winding, a cylindrical cavity which is placed with a gap, the rotor containing an inductor and a bearing unit (see Balagurov, VA, Galaev FF Electric generators with permanent magnets. - M.: Energoatomizdat, 1988. - 280 S.).

The disadvantage of this device is the inability to significantly reduce the overall size of the device by increasing the speed of rotation of the rotor, since the load bearing characteristics of the sites do not permit high speed rotation of the rotor when the reduction of its radial dimension.

The closest to this invention the device is electromachine, comprising a housing with end shields in the cavity of which is a laminated stator core with slots, which are placed in the coil winding, fixed wedges grooves, and in the cavity of the stator rotatably placed the rotor containing the inductor with the outer cylindrical surface including the speaker pole permanent magnets, non-magnetic wedges and the shaft, the length of the rotor is greater than the length of the inductor, and the ends of the rotor is made in the form of cylindrical sleeves of a nonmagnetic material, installed flush with the outer surface of the inductor, and the bearing rotor Assembly is made with the possibility of gas-static and hydrodynamic maintain, for which the outer surface of the rotor is given a cylindrical shape and is placed in the cylindrical cavity of the sleeve is fixed in the cavity of the stator with the possibility of supplying gas for cooling the surface of the stator, while the body cavity is configured to supply it to the cooling gas and removal of the latter, for which purpose the inner surface of the housing is fitted with a longitudinal channels provided with radial ventilation channels made between packets of the stator core (see RF patent №2385523, IPC NC 5/16, 2010).

The disadvantages of this device is ineffective cooling of the windings and stator core, increased non-magnetic gap due to the presence of the sleeve sufficiently large thickness, which reduces the induction in the gap between the stator and the rotor and, consequently, affects the weight and dimensions of the machine, the low carrying capacity of radial gas bearings under high dynamic loads. Also what about the, not cooling provided by a permanent magnet.

The challenge which seeks the proposed technical solution is to increase the efficiency of cooling the windings and stator core and permanent magnets, reducing heating sleeve gas-static bearing and stator core from friction in gas-static bearings, the improvement in mass and size parameters, the reliability of the electrical machinery.

The technical result is achieved when solving a task, expressed in effective cooling of the windings and stator core, reduced weight and size and increase the service life of electric machines, including those running at higher and higher speeds. At the same time ensures a minimum deflection of the rotor, the effective cooling of the permanent magnets, expands the scope of rotor stability by damping radar radial gas bearings (LGB) and prevents jamming of the rotor at high peripheral speeds in the area of LGB.

The problem is solved in that the electromachine, comprising a housing with end shields in the cavity of which is a laminated stator core with slots, which are placed in the coil winding, fixed wedges grooves, and in the cavity of the stator with the possibility of rotation system-easy installation which I posted the rotor, containing the inductor with the outer cylindrical surface, including poles, permanent magnets, non-magnetic wedges and the shaft, the length of the rotor is greater than the length of the inductor, and the ends of the rotor is made in the form of cylindrical sleeves of a nonmagnetic material, installed flush with the outer surface of the inductor, and the bearing rotor Assembly is made with the possibility of gas-static and hydrodynamic maintain, for which the outer surface of the rotor is given a cylindrical shape and is placed in the cylindrical cavity of the sleeve is fixed in the cavity of the stator with the possibility of supplying gas for cooling the surface of the stator, while the body cavity is configured to supply it to the cooling gas and drain after the last heat in the car, for which the inner surface of the housing with longitudinal channels provided with radial ventilation channels made between packets of the stator core, characterized in that the stator is made with independent ventilation, for which the body is equipped with at least two pipes made with the possibility of a supply outlet of the cooling gas in the volume of the shell occupied by the stator, the sleeve is provided with longitudinal projections, the number, location and cross-section of which corresponding to the number location and cross section of the slots of the stator core, in which the protrusions of the sleeve is placed, and between the surface of the ledge and wedge slot left slot of the ventilation channel, with volume projections sleeves are made longitudinal apertures communicated with the radial feed holes open into the internal cavity of the sleeve, in addition, in the cavity of the housing coaxially with the cavity of the stator core is installed a cylindrical sleeve made of insulating material such as fiberglass, sealed my ends with the extreme ends of the packages of the stator core, and the outer surface of the bushings at the ends facing the end boards, equipped with a pair of sealing rings, in addition, the butt end of the shield case is airtight, with the cylindrical sleeve is used as the outer casing radar radial gas bearings and the ends of the rotor used as their pivots, in addition, the inductor is supplied by a bandage, the outer surface of which is attached a cylindrical shape corresponding to the diameter and the roughness of the outer surface of the end sections of the rotor, and electromachine provided with at least one axial petal gas bearing, in addition, face shields made of radial holes, the entrance of which is obsen with a source of lubricating gas, and the output is communicated with the annular groove disposed between a pair of sealing rings, which, in turn, communicated with the through longitudinal holes of the cylindrical sleeve, in addition, the shield is provided with a nozzle connected to a separate source of cooling gas and reported through the end sections of the coil with the cooling channel magnets formed by the cross section of the bottom of the slots and turned to him with surface permanent magnets, and at the opposite end of the housing channels communicated with a working gap of the axial petal gas bearing, which, in turn, communicated with the atmosphere or a gas collection.

In addition, as a cooling gas windings and stator core used hydrogen or helium. When the gas, cooling the permanent magnets used after cooling, preferably to a temperature below 123 K. in Addition, a lubricating gas is used after cooling, preferably to a temperature below 123 K.

Comparative analysis of the essential features of the proposed technical solutions and essential features of the prototype and analogues demonstrates its compliance with the criterion of "novelty".

While the essential features of the characterizing part of the claims, solves the following functional tasks.

A sign indicating that the stator you Anen with independent ventilation, what the body is equipped with at least two pipes made with the possibility of a supply outlet of the cooling gas in the volume of the shell occupied by the stator, allows effective cooling of the windings and the stator core, the independence of the stator ventilation prevents the cooling of its gas to other components, such as rotor or adulteration in the lubricating flow of gas, the gas bearings. This, in turn, allows it to be used as a cooling gas is hydrogen or helium, including cryogenic condition, without the danger of loss of gas in the environment.

Signs indicating that "the sleeve is provided with longitudinal projections, the number, location and cross-section which corresponds to the number, location and cross section of the slots of the stator core, in which the protrusions of the sleeve placed, ensure reliable retention of the sleeve in the slots, eliminating the possibility of arbitrary radial displacement in the direction of the surface of the rotor or spinning.

A sign indicating that "between the surface of the ledge and wedge groove left of the slot vent", allows efficient cooling of the slot part of the coil and the teeth of the stator core.

A sign indicating that "in the volume of the projections of the sleeve is made through selling the further openings, communicated with the radial feed holes open into the internal cavity of the sleeve, provides conditions for the use of the gas layer in the gap between the inner surface of the sleeve and brace the rotor for the organization of gas-static bearing and reduce deformation of the radial clearance of gas-static bearing from the high pressure of the pressurization gas in them.

A sign indicating that "in the cavity of the housing coaxially with the cavity of the stator core mounted cylindrical sleeve", allows you to increase the size of the footprint of the rotor (in the presence of the respective bushings), which can be used as a support surface radar radial gas bearings.

Signs indicating that the cylindrical sleeve is made from insulating material such as fiberglass and bonded "with their ends with the ends of the extreme packages stator core, provide a performance radar radial gas bearings without deterioration of the electromagnetic characteristics of the windings of the stator and rotor.

Signs indicating that the outer surface at the ends of the cylindrical sleeves, "facing the end boards, equipped with a pair of sealing rings" and the sign "butt end of the shield case is airtight, enable you to ensure the integrity of the volume is orpus, hosting the stator.

The signs, which indicates that the cylindrical sleeve is used as the outer casing radar radial gas bearings and the ends of the rotor used as their pivots", you can create on the ends of the rotor sections made with the possibility of gas-dynamic maintenance.

Signs indicating that the inductor is supplied by a bandage, the outer surface of which is attached a cylindrical shape corresponding to the diameter and the roughness of the outer surface of the end sections of the rotor, provide high strength characteristics of the rotor, at the same time you can use an external surface of the rotor for radial gas-static bearing.

Signs indicating that "electromachine provided with at least one axial petal gas bearing provides the perception of axial dynamic loads.

Signs indicating that "in the end shields are made of radial holes, the entrance of which is in communication with a source of lubricating gas, and an outlet communicated with the annular groove disposed between a pair of sealing rings, which, in turn, communicated with the through longitudinal holes of the cylindrical sleeve, enable you to organize the supply of lubricating gas in the gas-static bearings of the machine without the Pach the project with gas, used for cooling the stator.

Signs indicating that "the shield is provided with a nozzle connected to a separate source of cooling gas and reported through the end sections of the coil with the cooling channel magnets formed by the cross section of the bottom of the slots and turned to him with surface permanent magnets, and at the opposite end of the housing channels communicated with a working gap of the axial petal gas bearing, which, in turn, communicated with the atmosphere or a collection of gas, allow for efficient cooling of the permanent magnet machine and the axial LGB.

A sign indicating that "as a cooling gas windings and stator core used hydrogen or helium, can improve the efficiency of cooling the windings and stator core and to reduce the cost of power for pumping gas.

A sign indicating that "gas, cooling the permanent magnets used after cooling, preferably to a temperature below 123 K", allows you to increase the cooling efficiency of permanent magnets.

A sign indicating that "lubricating gas is used after cooling, preferably to a temperature below 123 K", allows you to lower the temperature of the inductor and to reduce heat flow from the friction in the gas-static bearings to the permanent magnets, the sleeve is apostatizes bearing and the teeth of the stator core.

Figure 1 shows a longitudinal section of the electrical machinery, figure 2 - cross section, figure 3 is a cross section of the axle and radial LGB.

In the drawings is shown a housing 1 with a longitudinal ventilation channels 2, 3 packages of the stator core, the grooves 4, coil 5 of the stator winding, the wedges 6, sleeve 7 with a through axial holes 8, placed in a longitudinal edges 9 of the sleeve 7, and the radial feed holes 10 of gas-static bearings, slotted vents 11, a cylindrical sleeve 12, 13 on the stator, the end shields 14, 15 with a radial feed holes 16, 17 compressed lubricating gas gas-static bearings, sealing rings, 18, 19, 20, 21, 22, 23, the petals 24, 25 radial LGB, pole 26, the permanent magnets 27, nonmagnetic wedges 28, shaft 29, the end of the cylindrical sleeve 30, 31 on the rotor, the brace 32, the gap 33, the thrust washer 34, the cover 35, 36 of the rotor with axial holes 37, 38, longitudinal channels 39 cooling the permanent magnets 27, axial LGB 40, 41, push the sheets 42, 43 extreme package 3 of the stator core, the shoulder 44, the split ring 45, anemones 46, radial ventilation ducts 47 between packets 3 of the stator core, remote ring 48, the cover 49 of the axial LGB, annular channel 50 cooled gas into the cavity of the housing 1 of the electrical machinery, the annular channels 51, 52 of the heated exhaust gas from the cavity of the electrical machinery, Patras the side 53 of the cooled gas in the annular channel 50, the nozzles 54, 55 of the heated exhaust gas from the annular channels 51, 52, the nozzle 56 for supplying a cooling gas of permanent magnets, the annular groove 57 and the axial channel 58 of the exhaust gas from the gas-static bearings, gadobenic 59, the outlet 60 of the exhaust gas from the gas-static bearings and cooling the permanent magnets 27.

Electromachine comprises a sealed enclosure 1, the cavity of which there are laminated packages 3 from electrical steel stator core (figure 1, figure 2). On the outer diameter of the laminated packages 3 of the stator core are based on the housing 1 of the electrical machinery. Packages 3 stator core provided with slots 4, which are placed in the coil 5 of the stator winding. The conductors of the coils 5 of each slot 4 fixed wedges 6. In the grooves 4 is also sleeve 7, with longitudinal protrusions 9, the number, location and cross-section which corresponds to the number, location and cross section of the grooves 4 laminated core 3 of the stator, which are placed in the longitudinal protrusions 9 of the sleeve 7. Between the longitudinal surface of the protrusion 9 and the wedge 6 of the groove 4 left slot vent 11. In the amount of longitudinal protrusions 9 of the sleeve 7 is made through the axial holes 8 provided with a radial feed holes 10, open into the internal cavity of the sleeve 7.

In the cavity of the housing 1 coaxially with the cavity ser is ecnica stator mounted cylindrical sleeve 12, 13, is made of insulating material such as fiberglass, sealed my ends with the extreme ends of the package 3 of the stator core. The external surface of the cylindrical sleeves 12, 13 at the ends facing the end panels 13, 14, provided with a pair of sealing rings 18, 19, 20, 21 (for example, rubber). The joints of the end panels 14, 15 of the housing 1 is airtight. When this cylindrical sleeves 12, 13 are used as the outer casing radar radial gas bearings 24, 25, and the ends of the rotor used as their pivots (petals radial LGB 24, 25 is installed in the cavity of the cylindrical sleeves 12, 13).

In the cylindrical cavity of the sleeve 7 and petals radial LGB 12, 13 posted by the rotor for rotation.

The rotor comprises an inductor with an external cylindrical surface, including pole 26, the permanent magnets 27, nonmagnetic wedges 28 and shaft 29. The ends of the rotor is made in the form of cylindrical sleeves 30, 31 of non-magnetic material mounted flush with the outer surface of the inductor, so that the length of the rotor is greater than the length of the inductor.

To ensure the mechanical strength of the inductor is supplied by a brace 32, the outer surface of which is attached a cylindrical shape corresponding to the diameter and the roughness of the outer surface of the cylindrical end is tulok 30, 31, and the brace 32 is made of high-strength heat-resistant non-magnetic material, is made, preferably, the winding of carbon fibers impregnated with a heat-resistant synthetic resins. The shaft 29 is made hollow, with the possibility of connection with the shaft of the turbine and/or compressor.

Gas-static bearing includes a bearing surface (made up of an inner cylindrical surfaces of the sleeves 7), the pin (composed of the outer surface of the brace 32 of the rotor and a part of the surface of the cylindrical sleeves 30, 31), and the gap 33 between them.

Radial LGB include a bearing surface (made up of an inner cylindrical surfaces of the sleeves 12, 13 and lobes 24, 25), trunnion (composed of a cylindrical sleeves 30, 31 on the rotor).

Axial bearing unit electrical machinery are axial LGB 40, 41 and the thrust washer 34.

Bearing rotor Assembly is made with the possibility of gas-static and hydrodynamic maintain, for which the outer surface of the rotor is given a cylindrical shape and is placed in the cylindrical cavity of the sleeve 7, is fixed in the cavity of the stator with the possibility of supplying gas for cooling the surface of the stator.

The cavity of the housing 1 is configured to supply it to the cooling gas and removal of the latter, for which purpose the inner surface of the housing is fitted with rojalnymi channels 2, communicated with radial ventilation channels 47, is made between the package 3 of the stator core. The stator is made with independent ventilation, for which the body 1 is provided with a socket 56 for supplying a cooling gas and nozzles 54, 55 of the outlet of the cooling gas in the casing 1, occupied by the stator.

In the end shields 14, 15 is a radial holes 16, 17, the input of which is communicated with a source of lubricating gas (not shown), and the output is communicated with the annular groove disposed between a pair of sealing rings 18, 19, 20, 21, which, in turn, communicated with the through longitudinal holes of the cylindrical sleeves 12, 13, moreover, the shield 14, is supplied by a pipe 56 connected to a separate source of cooling gas (not shown) and communicated through the end sections of the inductor with the channels 39 of the cooling of the magnets 27 formed by the cross section of the bottom grooves magnets and turned to him with surface permanent magnets 27 and at the opposite end of the housing 1, the channel 39 is in communication with the working gap of the axial petal gas bearing, which, in turn, communicated with the gas collection 59 and pipe 60.

Ventilation channels 2, 11, 47 aerodynamically communicated with each other and with the annular channel 50 of the supply and exhaust 51, 52 of the cooling gas (such as hydrogen, helium, air) and are used to organize the latter is Noah Francis independent ventilation system electrical machinery.

The stator is collected in the following order. From the stamped electrical steel sheets are collected packages 3 of the stator core and fasten them by welding through grooves on the outer cylindrical surface of the package. In case 1 set push the sheet 43 against the shoulder 44; then in case 1 electrical machinery installed packages 3 of the stator core and anemones 46 (see figure 1). After the last package installed push the sheet 42. Set of 3 packages and vetronic 46 is fixed in the housing 1 of the electric machines with split ring 45.

Later in the grooves 4 packages 3 stator core set slot insulation (not shown), is placed the coil 5 of the stator winding and jam their slot wedges 6. The stator winding is subjected to impregnation and drying. With the outer surface of the wedges 6 and remaining teeth packages 3 remove the remains of the impregnating compound. Then grind the inner cylindrical surface of the sleeve 7 gas-static bearing. Further, the inner cylindrical surface of the sleeve 7 gas-static bearing cover antifriction material, such as WAP-3. Inside the slots 4 of the stator wedges under 6 firmly establish the sleeve 7 gas-static bearing, leaving the slot vents 11. The ends of the core extreme package 3 of the stator core directly under pressure leaves 42, 43 prickle who live cylindrical sleeve 12, 13. In the cavity formed by the inner surfaces of the cylindrical sleeves 12, 13, insert the petals 24, 25 radial LGB. On the extreme ends of the cylindrical sleeves 12, 13 wear rubber sealing rings 18, 19, 20, 21. In the cavity of the stator formed by the petals 24, 25 radial LGB and sleeve 7, insert the rotor. On the end shields 14, 15 put on the sealing rings 22, 23 and set the panels 14, 15 in the housing 1 of the electrical machinery. In the end shield 15 (1) establish axial LGB 40, remote ring 48, wear on the shaft 29 of the thrust washer 34, establish axial LGB 41, the cover 49 and lock nut thrust washer axial LGB.

Electromachine works as follows. The cooled gas (hydrogen, helium or air) from the outside of the compressor pump through the pipe 53 into the annular channel 50 and into the cavity of the housing 1 of the electrical machinery. Next, the gas is distributed over the axial ventilation channels 2 in the radial ventilation ducts 47, then enters the slotted vents 11 and leaves them in the area of end parts of the stator winding, is collected in the annular channels 51, 52 of the extrusion of the heated gas and then through the nozzles 54, 55 remove the fan to the cooler gas. After cooling gas again enters the pipe 53 for cooling the generator. This provides effective independent multi-jet exhaust Francis ventiljats the I winding and stator core electrical machinery.

Lubricating gas from the compressor under pressure enters through radial feed holes 16, 17 in the through hole 8 and the radial feed holes 10. Then lubricating gas from the ends of the sections of gas-static bearing is assembled in the annular groove 57 and then through the axial channel 58 is fed in the radial LGB and in the collection of the gas, mixed with the refrigerant gas of permanent magnets 27. In addition, the cooled and cleaned gas by the fan through the pipe 56 in the shield 14, the holes 37 in the cover 35 is supplied into the channels 39 cooling the permanent magnets 27, whence it goes out through the axial opening 38 in the cover 36, the axial LGB 40, 41, gadobenic 59 and the pipe 60. The electrical machinery is not different from a conventional electric machines.

1. Electromachine, comprising a housing with end shields in the cavity of which is a laminated stator core with slots, which are placed in the coil winding, fixed wedges grooves, and in the cavity of the stator rotatably placed the rotor containing the inductor with the outer cylindrical surface, including poles, permanent magnets, non-magnetic wedges and the shaft, the length of the rotor is greater than the length of the inductor, and the ends of the rotor are made as cylindrical sleeves of a nonmagnetic material, installed flush with the external surface is Yu inductor, moreover, the bearing Assembly rotor made with the possibility of gas-static and hydrodynamic maintain, for which the outer surface of the rotor is given a cylindrical shape and is placed in the cylindrical cavity of the sleeve is fixed in the cavity of the stator with the possibility of supplying gas for cooling the surface of the stator, while the body cavity is configured to supply it to the cooling gas and removal of the latter, for which purpose the inner surface of the housing with longitudinal channels provided with radial ventilation channels made between packets of the stator core, wherein the stator is made with independent ventilation, for which the body is equipped with at least two nozzles made with the possibility of a supply outlet of the cooling gas in the volume of the shell occupied by the stator, the sleeve is provided with longitudinal projections, the number, location and cross-section which corresponds to the number, location and cross section of the slots of the stator core, in which the protrusions of the sleeve is placed, and between the surface of the ledge and wedge groove left of the slot vent, the amount of longitudinal protrusions sleeves are made longitudinal apertures communicated with the radial feed holes open in the internal the YOYO cavity of the sleeve, in addition, in the cavity of the housing coaxially with the cavity of the stator core is installed a cylindrical sleeve made of insulating material such as fiberglass, sealed my ends with the extreme ends of the packages of the stator core, and the outer surface at the ends facing the end boards, equipped with a pair of o-rings, in addition, the butt end of the shield case is airtight, with the cylindrical sleeve is used as the outer casing radar radial gas bearings and the ends of the rotor used as their pivots, in addition, electromachine provided with at least one axial petal gas bearing, in addition to in the end shields are made of radial holes, the entrance of which is in communication with a source of lubricating gas, and an outlet communicated with the annular groove disposed between a pair of sealing rings, which, in turn, communicated with the through longitudinal holes of the cylindrical sleeve, in addition, the shield is provided with a nozzle connected to a separate source of cooling gas and reported through the end sections of the coil with the cooling channels of permanent magnets formed by the cross section of the bottom of the slots and turned to him with surface permanent magnets, and at the opposite end of the housing channels the message is s with a working gap of the axial blade of the gas bearing, which, in turn, communicated with the gas collection.

2. Electromachine according to claim 1, characterized in that the cooling gas windings and stator core used hydrogen or helium.

3. Electromachine according to claim 1, characterized in that the gas, cooling the permanent magnets used after cooling, preferably to a temperature below 123 K.

4. Electromachine according to claim 1, characterized in that the lubricating gas is used after cooling, preferably to a temperature below 123 K.



 

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Electric machine // 2489788

FIELD: electricity.

SUBSTANCE: electric machine has a hermetically sealed housing, inside of which there is an interleaved stator core which rests on the housing of the electric machine by the external diameter. The stator core is provided with open grooves which accommodate spools. The spools of each stator groove are fixed by a wedge and a splined insert in contact with it, the cross-section of which can fix the back of the splined insert under the wedge of the groove. The surface of the back of the splined insert on its entire length is provided with a longitudinal channel which opens inside the housing of the electric machine, which is configured to feed compressed gas therein. The splined insert has radial holes, wherein the volumes of the splined inserts which protrude over the surface of the cavity of the stator core are merged into a tubular bushing, preferably composed of segments with formation of an inner surface of a cylindrical shape. Inside the housing, there are cylinder bushings, the cavity diameter of which is equal to the diameter of the tubular bushing. Between the ends of the stator core and the ends of the cylinder bushings facing them, there are stopper rings, the cavity of which is greater than the diameter of the cylindrical cavity of the stator core, provided with a shoulder which encircles part of the outer surface of the cylinder bushing. The stopper rings are made from nonmagnetic material and are fastened with the stator core. The cylinder bushings are mounted with possibility of radial displacement relative the longitudinal axis of the cylindrical cavity of the stator core, for which contacts of the bushings with the housing, an end shield and stopper rings are provided with seal rings, which can be elastically deformed radially and along the longitudinal axis of the stator core. The rotor has an inductor with a cylindrical outer surface, made from poles consisting of permanent magnets, nonmagnetic wedges and a shaft, the length of which exceeds that of the inductor. The ends of the inductor are rigidly fastened to end cylinder bushings made from nonmagnetic material, placed flush with the outer surface of the inductor, which is provided with a band, the outer surface of which has a cylindrical shape which corresponds on the diameter and roughness to the outer surface of the end cylinder bushings, wherein a gas bearing is formed by the gap between the inner cylindrical surfaces of segments of the splined inserts, cylinder bushings and the outer surface of end cylindrical inserts and the rotor band; furthermore, the axial bearing assembly of the electric machine has axial lobed gas bearings and a bearing disc.

EFFECT: reduced weight and size and longer service life of electric machines, including electric machines operating at high rotary speeds, while ensuring minimal rotor bowing, better cooling of the rotor and stator coil.

3 cl, 2 dwg

FIELD: electricity.

SUBSTANCE: proposed submersible water-filled synchronous generator of vertical design comprises a basic shield, where a circular flat magnetic conductor is fixed, wound from electric steel, with a winding, a rotor disc with permanent magnets, a bearing shield arranged as cantilevered relative to the basic shield and comprising bearings of the rotor shaft. At the same time, according to this invention, the generator is equipped with a thrust sliding bearing, which has a journal in the form of a disc arranged on the rotor shaft, and a step-bearing in the form of a thrust sleeve, which covers the bearing shield at the side opposite to the basic shield, and is fixed with the help of bolts. The entire inner cavity of the generator is filled with water, and the generator with a hydraulic turbine arranged above it is submerged under the water level and is retained in this position with the help of floats, and is kept away from displacement by a retaining device.

EFFECT: reduced axial dimensions and material intensity of a generator with simultaneous increase of its operational reliability.

1 dwg

FIELD: machine building.

SUBSTANCE: machine has main housing (2), a turning element and at least one bearing device. The latter has a working bearing and retaining bearing (8) matching with the working bearing. Bearing (8) has race (9) of bearing of main housing (2) and race (10) of bearing of the turning element, which is located so that it can be turned relative to race (9) of the bearing of main housing (2). When the machine is in normal operating conditions, the turning element is installed durably in a non-contact manner with possibility of being turned relative to housing (2) above the working bearing so that race (10) relative to race (9) performs no turning movement. When the machine is in specific operating conditions, in which the turning element is not installed durably in a non-contact manner with possibility of being turned relative to housing (2) above the working bearing, the turning element brings race (10) into rotation relative to race (9) so that turning element (4) is installed above bearing (8) at least for a short period of time in a contact manner with possibility of being turned. Antifriction layer (11) made as liquid metal is located between race (9) and race (10).

EFFECT: providing especially long service life of a retaining bearing owing to making an antifriction layer from liquid metal, which reduces friction so that only inconsiderable heating of the retaining bearing occurs in specific operating conditions.

9 cl, 4 dwg

Electric spindle // 2479095

FIELD: electricity.

SUBSTANCE: electric spindle comprises a body, in the cavity of which there is a laminated stator core, equipped with semi-closed slots, in which there are winding coils placed, besides, in the cylindrical cavity of the stator there is a rotor installed as capable of rotation, and its bearing unit is arranged as capable of gas-dynamic support, at the same time the electric spindle is equipped with a clamp for fixation of a working tool. At the same time, according to this invention, conductors of the winding of each stator slot are fixed with a wedge and a key insert contacting with it from insulating material, the cross section of which is made as capable of fixation of the key insert back under the slot wedge, and the ledge section complies with the slot splint section, besides, the profile of the key insert ledge surface corresponds to the surface of the cylindrical cavity of the stator core, the surface of the key insert back along its entire length is equipped with a longitudinal chute, which is open into an inner cavity of the spindle body arranged as capable of supplying air into it, in the cavity of the electric spindle body there are cylindrical bushings placed, the diameter of the cavity of which is equal to the diameter of the cylindrical cavity of the stator core, and between the ends of the stator core and the ends of cylindrical bushings facing them there are support rings installed, the cavity of which exceeds the diameter of the cylindrical cavity of the stator core, equipped with a collar that covers a part of the outer surface of bushings, the specified thrust rings are made of non-magnet material and are fixed with the stator core, and the cylindrical bushings are installed as capable of radial displacement relative to the longitudinal axis of the cylindrical cavity of the stator core, for this purpose contacts of bushings with the body, the end shield and collars of thrust rings are equipped with sealing rings arranged as capable of elastic deformation radially and along the longitudinal axis of the stator core. The rotor is made with inner cavities, for this purpose it comprises coaxial hollow shaft and shell, which are rigidly connected to each other, at least by three links equidistant from each other and made in the form of plates of identical thickness, being aligned radially to the longitudinal axis of the rotor, the ends of the rotor are rigidly fixed to the end covers, for instance, by vacuum-diffusion welding, besides, one of end covers of the rotor is arranged as thickened and is equipped with a clamp for fixation of a working tool.

EFFECT: increased life of electric spindles, including those operating under higher and high frequencies of rotation, with simultaneous provision of minimum rotor sagging and improved cooling of both a rotor and a winding of an electric spindle stator.

3 cl, 2 dwg

Electric machine // 2477916

FIELD: electrical engineering.

SUBSTANCE: electric machine contains a sealed housing the cavity whereof accommodates a laminated stator core made of electrical steel; along the outer diameter, the laminated stator core relying on the electric machine housing; the stator core has open slots wherein winding coils are placed while the stator cylindrical cavity accommodates the electric machine rotor installed so that to enable rotation. According to this invention, the laminated stator core has radial inter-pack ventilation channels, the aerodynamically communicating housing longitudinal channels with inlet holes, communicating with environments via a filter; the conductors of each stator slot winding are fixed with a wedge and a spline insert contacting it, the said insert cross section designed so that to enable fixation of the spline insert back under the slot wedge while the projection cross section matches that of the slot; the spline insert back surface, along the whole of its length, has a longitudinal groove communicating with the stator core inter-pack ventilation channels; the spline inserts volumes projecting above the stator core cavity surface are joined to form a tubular sleeve, preferably - composed of segments, with a cylindrical-shaped inner surface formation; installed inside the housing cavity, coaxial to the stator core cavity, are cylindrical sleeves made of an insulation material such as glass-cloth-base laminate, the sleeves butt-ends attached to those of the stator utmost packs; additionally, the rotor contains an inducer with a cylindrical external surface consisting of poles, permanent magnets, non-magnetic wedges and a shaft; the rotor length exceeds that of the inducer; rigidly attached to the inducer butt-ends are end cylindrical sleeves made of a non-magnetic material, installed flush relative to the inducer external surface and placed inside the stator cylindrical sleeves cavities representing journals of radial gasodynamic petal bearings.

EFFECT: reduction of weight and overall dimensions, increase of life margin of electric machines, in particular - those operating at higher and high rotation rates, combined with ensuring the rotor bow minimisation, improvement of the stator winding cooling and extension of the rotor stability region due to deformation of the said radial gasodynamic petal bearings and prevention of the rotor jams at high circular velocities within the gasodynamic petal bearings positioning area.

3 cl, 2 dwg

Electric machine // 2474945

FIELD: electricity.

SUBSTANCE: electric machine comprises a tight body, in the cavity of which a laminated stator core is installed with open slots, where winding coils are arranged, and a rotor. At the same time the laminated stator core is equipped with radial packet-to-packet ventilation channels, aerodynamically communicated longitudinal channels of the body with inlet holes communicated via a filter with environment, conductors of the winding of each stator slot are fixed with a wedge and a key insert contacting with it, the cross section of which is arranged as capable of fixing the key insert back under the slot wedge, and the section of the ledge corresponds to the section of the slot splint, the surface of the key insert back along its entire length is equipped with a longitudinal chute communicated with packet-to-packet ventilation channels of the stator core, volumes of key inserts protruding above the surface of the stator core cavity are combined into a tubular bushing, preferably made from segments, with formation of the inner surface of cylindrical shape, besides, in the cavity of the body there are cylindrical bushings installed, the diameter of the cavity in which is equal to the diameter of the tubular bushing, between ends of the stator core and ends of cylindrical bushings facing them there are thrust rings installed, the cavity of which exceeds the diameter of the cylindrical cavity of the stator core, equipped with a collar, covering a part of the outer surface of the cylindrical bushing. Thrust rings are made of non-magnetic material and are fixed with a stator core, cylindrical bushings are installed as capable of radial displacement relative to the longitudinal axis of the cylindrical cavity of the stator core, for this purpose contacts of bushings with the body, end shield and thrust rings are equipped with sealing rings made with the possibility of elastic deformation radially and along the relatively longitudinal axis of the stator core. The electric machine comprises an inductor with the outer cylindrical surface made of poles, permanent magnets, non-magnet wedges, a shaft, the length of which exceeds the length of the inductor, besides, with the inductor ends there are end cylindrical bushings fixed rigidly, which are made of a non-magnetic material and arranged aflush with the outer surface of the inductor.

EFFECT: invention provides for minimum sagging of a rotor, improved cooling of a rotor and a stator winding with simultaneous reduction of weight and dimension indices and higher resources of electric machines, including those operating under higher and high frequencies of rotation.

3 cl, 2 dwg

FIELD: electricity.

SUBSTANCE: creation of multipurpose high-loaded thrust-journal bearing on shaft driving end of submersible electric motor of vertical open design is executed using inserts made of high-density frictionproof powder material. Asynchronous machine (AMV OGW) contains housing (1), shaft (2) with collar (3) on driving shaft end and having thrust surfaces (4) and (11) at both sides which surfaces function as moving sliding surfaces (4) for pump, (11) for drilling gear. For immovable parts of bearing, inserts (6) and (10) are used which are made of high-density frictionproof powder material with the same sliding surfaces (4) and (11) allowing motor to work with its driving end up for pump driving and down - for drilling gear driving. Cooling of bearing sliding surfaces is executed by fluid environment through holes (13) and (14) in the housing (1) and through free gaps (7), (15), (16), (17) between the housing (1) and the shaft (2).

EFFECT: higher reliability and lifetime of asynchronous machine operating at submergence depth up to 3000 m and at high temperature of strata water.

2 dwg

FIELD: machine building.

SUBSTANCE: downhole induction motor shaft idle extension supports radial thrust plain bearing to make rotor aligned with stator bore and keep working clearance between rotor and stator invariable. Proposed induction motor comprises housing 1, end shield 4, shaft 6 with idle extension provided with moving thrust sleeve 8 that has thrust sliding surface 9 radial sliding surface 10. Fixed bearing insert 11 made from high-density powder material and having similar sliding surfaces 9 and 10 is tightly fitted in cylindrical recess of said bearing shield. Sliding pairs are cooled down via free clearance 12 and bearing shield holes 13. Cooling water is fed outside via holes 14 and 15 in housing 1.

EFFECT: improved operating performances of downhole motor, higher reliability and efficiency.

2 dwg

FIELD: electricity.

SUBSTANCE: noncontact electric motor includes hollow cylindrical nonmagnetic slotless stator with winding, which is arranged between parts of composite rotor. Outer part of rotor is made in the form of ferromagnetic shell, and inner part is made in the form of cylindrical constant magnet fixed on shaft in bearings. The latter are arranged in support sleeves of stator ends, which can be made from heat-resistant dielectric material.

EFFECT: improving positioning accuracy of rotor axis and improving reliability of proposed noncontact electric motor at simultaneous simplification of its design and manufacturing procedure, reduction of weight, dimensions and manufacturing costs.

2 cl, 1 dwg

FIELD: electricity.

SUBSTANCE: invention is related to the area of electric engineering and namely to electric machines with permanent-magnet excitation, and it may be used in electric machine engineering. At that the invention ensures improved rotation uniformity, enhanced energy indicators, reduction of noise and vibration level for the magnetoelectric machine. In the suggested magnetoelectric machine including armature with winding laid in z slots and non-salient pole rotor with permanent magnets the armature slots are bevelled at the angle α corresponding to an integer number of tooth harmonic periods.

EFFECT: decreasing reactive moment pulsation for the magnetoelectric machine.

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