Electric machine

FIELD: electricity.

SUBSTANCE: electric machine contains a stator (1), a rotor (2), an external blower (3), the stator core (1) assembled of electrotechnical steel sheets designed as having concentric projections (9) within the outer diameter zone with ventilation holes (10) therein. During the stator assembly each sequential sheet (group of sheets) of the stator core is tangentially shifted relative to the preceding sheet (group of sheets) by a distance of the pitch of ventilation holes (10) in the core sheets concentric projections (9). Envisaged in the structural element (6) for the stator support on the external blower (3) side are air-directing enclosures (14), ventilation holes (16) and windows (15) for cooling air passage.

EFFECT: electric machine cooling improvement.

2 cl, 3 dwg

 

The invention relates to the field of electrical engineering.

Known electric machine designed to work in environment with high content of dust, active elements - winding and the conductive cores of the stator and rotor is cooled by a constant volume of air circulation inside the electric machine is provided with internal fan. Internal air, in turn, is cooled in cooler outside air, blowing through the air cooler is provided by an external fan. The cooler is a rolling camera, one of which (e.g., odd) is the hot internal air other (even) - cold outside air (see, for example, Aeoliki "Design of electrical machines", SEI, 1958, page 63, figure 2-42).

Known also adopted for the prototype electric machine closed ventilated motors with more efficient tubular cooler, in which the external air external fan is blown through the tubes of the cooler and the internal hot air moves across the tubes of the cooler (see the monograph, p.65, Fig.2-46).

A common disadvantage of these electric cars with air coolers relatively low cooling efficiency, greater consumption of materials and trudos the rata on the manufacturer.

The main objective of the invention is a significant increase in cooling efficiency of the electric machine while reducing both the cost of materials and labor required for its production.

The technical result is achieved in that in an electric car, containing a rotor, a stator, a conductive core which is assembled from sheets made of electrical steel sheet with grooves in the area of the internal diameter of the stator winding, external fan, structural elements, providing support stator and all electric cars, as well as vozdukhoplavanie covers the conductive sheets of the stator core in the area of the outer diameter is made with four concentric protrusions, which are provided for ventilation openings increments around the circumference of the locations, multiple step along the slots for the stator winding, each subsequent sheet of the stator core or each group of sheets core stator during Assembly of the core tangentially offset relative to the previous sheet or relative to the previous group of leaves on the step size vent holes in concentric ledges sheets, and in the design element, providing support stator and all electric cars, on the side of the external fan provided by the hcpa is Haapavesi, partitions, vents and Windows for the passage of cooling air, connecting the outlet area of the air from the external fan with ventilation holes in the end face of the stator core.

In an electric car on the side of the working end of the shaft is made vozdukhoplavanie, partitions, vents and Windows for cooling air outlet, matching in a constructive elements providing support to the stator and all electric cars on the other side of the fan.

The proposed design is illustrated by drawings, there is schematically shown:

figure 1 is a longitudinal section of an electric machine;

figure 2 - cross section A-A figure 1 is a stator core (rotor conventionally not shown);

figure 3 - type E in figure 2 (scan) is the location of the concentric protrusions sheets of the stator on the outer surface of the stator core.

Electric machine closed blown includes a stator 1, a rotor 2, the external fan 3 at the free end of the rotor shaft 2, the fan shroud 4, shields bearing 5, structural elements 6 and 7, which support the stator 1 and all electric cars. The sheets of the stator core 1 is made of electrical steel sheet in the area of the inner diameter with the slots for the stator winding, outer diameter 8 and concentric protrusions 9, which is provided vent the air holes 10. The value of the outside diameter of 8 from the point of view, the most economical use of electrical steel is determined by the width of the workpiece sheet (roll) electrical steel. The number of concentric protrusions 9 of the sheet of the stator core 1 is equal to four.

During Assembly of the stator core 1 of each subsequent page (or each group of sheets) tangentially offset (offset), for example, always in one direction relative to the previous page (or previous group of pages) on one ventilation hole. On the outer surface of the stator core 1 concentric ledges on the leaves of the core is formed of spiral protrusions 11 with axial ventilation ducts 12, and between the protrusions 11 - spiral ventilation ducts 13. The result formed a very large cooling surface of the stator core 1. If necessary during Assembly of the stator core 1 can be set and a different procedure tangential offset of the subsequent sheets (groups of pages) relative to the previous one.

Cooling ambient air (its movement is shown by arrows) from the outside of the fan 3 through the channels formed in the supporting structural element 6 of the stator 1 and the electric machine as a whole by partitions 14, the Windows 15 and the vent holes 16, enters the axial ventilation the e channels 12 and spiral ventilation ducts 13 and in the space between the stator core 1 and the cover 17, direct the jet of the entire outer surface of the stator core 1, is, for example, in the upper part of the electric machine and discharged into the environment from under the casing 18 in a limited sector of this space.

This air discharged all losses in the core and the stator winding 1 and partially - core loss and winding of the rotor 2. Internal air in this closed cooled electric machine disposed only loss in the rotor 2 is partially in the stator core 1, partly in the environment through mechanical structural elements, in particular through the shields bearing 5.

The use of outdoor air for removal of major losses directly from the surface of the stator core 1 puts the proposed cooling closed cooled electric machine efficiency to the level of cooling efficiency of the normal winding of electrical machines and repeatedly increased cooling surface this efficiency increases significantly, i.e. cooling of the proposed closed-blown electric cars more efficient cooling of the normal winding of the electric machine and the more the prototype. This significantly reduced the consumption of materials, as it does not need air coolers and significantly reduced labor costs for the manufacturing of electric cars.

Cooling this is a closed ventilated electric machine can be if necessary, further strengthened by performing in a constructive element 7, which provides support to the stator 1 and the electric machine, vozduhoprovodyaschih partitions, vents and Windows for cooling air outlet, similar to the partitions 14, the Windows 15 and the vent holes 16 in a constructive element 6.

1. Electrical machine containing a rotor, a stator, a conductive core which is assembled from sheets made of electrical steel sheet with grooves in the area of the internal diameter of the stator winding, external fan, structural elements, providing support stator and all electric cars, as well as vozdukhoplavanie housings, characterized in that the conductive sheets of the stator core in the area of the outer diameter is made with four concentric protrusions, which are provided for ventilation openings increments around the circumference of the locations, multiple step along the slots for the stator winding, each subsequent sheet of the stator core or each group of sheets of the stator core during Assembly core tangentially offset relative to the previous sheet or relative to the previous group of leaves on the step size vent holes in concentric edges of the sheets, and in a constructive element about is ensuring the support of the stator and all electric cars on the other side of the fan, provided vozdukhoplavanie, partitions, vents and Windows for the passage of cooling air, connecting the outlet area of the air from the external fan with ventilation holes in the end face of the stator core.

2. Electric machine according to claim 1, characterized in that structural elements that provide support stator and all electric cars on the side of the working end of the shaft, made vozdukhoplavanie, partitions, vents and Windows for cooling air outlet, matching in a constructive elements providing support to the stator and all electric cars on the side of the external fan.



 

Same patents:

FIELD: electricity.

SUBSTANCE: in one version of a system and a method to detect overload condition, tracking of a DC motor load includes the following: periodical disconnection of electric motor supply; voltage tracking; and measurement of time interval between the moment of start and the moment of end, at the same time the start moment corresponds to the moment of time, when the motor supply is switched off, and the moment of the end corresponds to the moment of time, when the tracked voltage and the reference voltage have substantially one and the same value.

EFFECT: increased accuracy of overload condition detection.

14 cl, 14 dwg

FIELD: electricity.

SUBSTANCE: invention refers to the field of electric engineering, namely to cooling system of electric machines of cylindrical design. Proposed electric machine comprises stator, including winding of stator, body for stator location, rotor and air gap, having, in general, a cylindrical configuration. Multiple radial first channels of cooling gas arranged along circumference is provided in the stator core. Jets of cooling gas are directed in the area of front part of winding, which is relatively distanced from stator core in order to provide for its forced cooling. Flows of cooling gas are directed to sections of front part of winding, which is located between areas with forced cooling of front part of winding and according front surface of stator core. At the same time electric machine comprises at least one of injection and suction fans, and in specified body for stator location there are the first, second, third and fourth openings. Besides, injection fan is connected along flow of cooling gas with specified first channels of cooling gas, and also to specified first, second, third and fourth openings of specified body; and suction fan is located in connection along flow of cooling gas with those spaces in electric machine, which receive cooling gas, released from air gap and specified first, second, third and fourth holes. At the same time specified first and second holes have smaller diametre than specified third and fourth specified holes of body for stator location.

EFFECT: provides for intense cooling of front part of electric machine stator winding and elimination of damage of insulation of winding wires, and also low consumption of power in proposed design of cooling system suitable for electric machines with high speeds of rotation.

19 cl, 1 dwg

Inductor generator // 2318289

FIELD: electrical engineering; electrical machines such as inductor generators.

SUBSTANCE: proposed inductor generator has front and rear end plates with radial holes, stator in the form of stack carrying running winding, rotor in the form of sprocket with axial magnetic circuits, built-in rectifier, field coils mounted on end plates and placed in magnetic contact with axial magnetic circuits, as well as rotor hollow shaft with radial holes, one of its extensions being provided with plug and other one communicates with inlet port of cooling system. Novelty is that rotor is provided with additional disks having radial ducts in vicinity of radial holes of rotor, radial holes of end plates, and end portions of rotor winding.

EFFECT: improved thermophysical characteristics, simplified mechanical design due to dispensing with separate fan.

1 cl, 3 dwg

FIELD: electric engineering, in particular, specific structural features of electric machines, namely - inductive generators.

SUBSTANCE: in synchronous generator, which contains frontal and back lids with apertures, stator in form of a packet with working winding, rotor with excitation source, hollow shaft of rotor with radial apertures and with central aperture, which is connected to input aperture of cooling system, air conductor and rectifier, according to given invention, rectifier is made in form of horizontal assembly with linear placement of diodes, where horizontal assembly is positioned in aperture of hollow shaft and held by cantilevers which pass through walls of air ducts and are held on lids. Usage of aforementioned structure allows substantial improvements to generator cooling, especially that of its rectifier, which is positioned first along air route, and also provides for increased compactness of structure, because shaft hollow is used for placement of rectifier, which simultaneously allows to reduce axial dimensions of generator.

EFFECT: improved operational characteristics due to reduction of consumed power and improvement of thermo-physical characteristics.

1 dwg

FIELD: electric engineering and electric mechanical engineering, namely - systems for cooling electric machines, primarily turbo-generators, with closed ventilation cycle.

SUBSTANCE: in accordance to the invention, electric machine includes body (1), comprising coolers (5), (6) of stator (2) and rotor (4), stator (2), having radial channels (11) in end zones of core, rotor (4), installed in stator (2) with air gap and having ventilation channels (13) with inputs and outputs on different rotation radiuses, ventilators (7), positioned on both sides of rotor barrel, and chambers (8), (9), one of which, chamber (8) for collecting cold air, is positioned between coolers (5) of stator and external surface of stator core (2), and another one, chamber (9) for collecting heated air, is positioned in placement zones of frontal parts of winding (10) of stator (2), outputs of stator coolers (5) and inputs into radial channels (11) of end zones of stator core are connected to chamber (8) for collecting cold air, and outputs of radial channels (11) of end zones, inputs of rotor coolers (6), inputs into ventilators (7) and outputs of rotor channels are connected to chamber (9) for collecting heated air, while outputs of coolers (6) of rotor (4) are connected to inputs of rotor channels, and high pressure zone (14) of ventilators (7) is connected to stator coolers inputs. In accordance to the invention, press plates have channels (12), inputs of which are connected to chamber (8) for collecting cold air, and outputs are connected to chamber (9) for collecting hot air, and main zone of stator core has water cooling system in form of coolers, positioned between packets (3) of stator core. Method for cooling the electric machine characterized above is realized as follows. Cooling air from stator coolers through the chamber for collecting cold air of stator, set up between stator coolers and external surface of stator core, and from rotor coolers, is directed by means of forcing elements, namely ventilators, positioned on both sides of rotor barrels, and rotor channels, along various routes into channels of rotor and stator core, and the air heated up in these channels is directed into chamber for collecting heated air, set up in zones of placement of frontal parts of stator winding, to inputs of rotor coolers and to inputs of ventilators and further - to stator coolers, where one route is set up from stator coolers, from outputs of which cooling air is directed from external surface of stator core into radial channels of end zone of stator core, another route is set up from rotor coolers, from outputs of which cooling air is directed into rotor channels. One more route, in accordance to the invention, is set up starting at rotor coolers, from outputs of which cooling air is directed into channels of press plates of stator core, while cooling of stator winding and main stator core is performed by water, circulating in pipes of coolers, which are positioned between main stator core packets.

EFFECT: increased cooling efficiency of stator winding and core, reduced material consumption of high power electric machines.

2 cl, 1 dwg

Motor-fan unit // 2292623

FIELD: electrical engineering.

SUBSTANCE: proposed motor-fan unit that can be used, for instance, in mining mechanical engineering is built around squirrel-cage induction motor and has frame with stator and rotor mounted therein. Novelty is that rotor carries fan blades, stator and rotor have conical surfaces, angles at vortices of stator and rotor cones are greatly different with respect to their contact between mentioned conical surfaces in absence of their wedging to afford antifriction bearing function, and stator mounts cleat preventing rotor-to-stator shift , for instance in axial direction.

EFFECT: simplified design at enhanced operating reliability of motor-fan unit.

1 cl, 2 dwg

FIELD: electromechanical engineering; automatic control systems for maintaining temperature and moisture content of electrical machine windings within desired optimal values.

SUBSTANCE: novelty is that newly introduced in electrical machine computer unit are machine temperature and moisture content mathematical model unit, correction unit, measuring unit, comparison unit, and control action signal shaping unit. Applied to inputs of mathematical model unit are signals arriving from outputs of machine and drier current and voltage sensors, machine and fan shaft speed, cooling medium temperature, and cooling duct outlet air moisture content sensors, as well as control action correcting computation process of armature, main-pole, and interpole winding insulation local maximal temperature and moisture content. Correcting unit functions to compare calculated and measured values of mean temperature and moisture content of main-pole, compensating, and interpole winding insulation, mean calculated values of these parameters passed from mathematical-model unit, and their measured values picked off measurement unit being applied to correction unit input; control action correcting computation of mentioned parameters picked off correction unit is sent to mathematical-model unit. Comparison unit is used to compare calculated values of mentioned parameters with their desired values and to generate error signals applied to comparison unit input which present difference between calculated and desired values of mentioned parameters; applied to comparison unit inputs are calculated values of mentioned parameters arriving from mathematical-model unit output as well as desired values of these parameters. Output signal of control-action signal shaping unit is passed to input of machine cooling system fan controlled drive; comparison-unit output error signals, signal indicating device change-over to emergency running taken off correction unit, as well as signals picked off electrical-machine output power computing unit and from electrical-machine current sensor are passed from correction unit to shaping-unit inputs.

EFFECT: enlarged functional capabilities.

3 cl, 2 dwg

FIELD: electromechanical engineering; rotors of air-cooled electrical machines.

SUBSTANCE: proposed rotor is provided with guide vanes made of nonmagnetic material and tangentially disposed between poles, baffle plates in the form of semi-bowl, radial troughs disposed on butt-end surface of rotor, and axial ducts communicating with respective radial ones. Rotor incorporates provision for raising current density thereby enhancing electrical machine efficiency.

EFFECT: improved cooling conditions for all stator and rotor parts, reduced temperature and enlarged service life of windings.

5 cl, 4 dwg

FIELD: electrical and electromechanical engineering; closed-cycle cooling systems for turbogenerators and other electrical machines using fans as delivery members.

SUBSTANCE: proposed method for gas cooling of electrical machine using closed-cycle exhaust-ventilation system involves delivery of cooling gas from stator coolers and from rotor coolers through fans disposed either side of rotor barrel and through rotor ducts, whose inlets and outlets are disposed on different radii of rotor motion, over three parallel paths to rotor ducts and stator core ducts; gas heated within these ducts is conveyed to stator and rotor coolers through hot gas accumulating chamber organized in vicinity of stator end windings. In the process gas heated in rotor ducts and some portion of gas heated in stator ducts is conveyed by means of fans to stator coolers, and remaining portion of gas heated in stator ducts is passed directly to rotor coolers. For implementing this method, electrical machine is provided with cooling ducts in main area of stator core uniformly distributed over its circumference. Entrance in and exit from each duct is made on core outer surface so that they do not communicate with stator-to-rotor gap thereby eliminating intercommunication between stator and rotor cooling systems and affording uniform winding and iron temperature distribution through length and circumference of stator core. Hot gas formed in stator-to-rotor gap does not reach stator ducts which raises stator winding and iron cooling effectiveness. Proposed cooling system provides for reducing slot height and stator core outer diameter thereby enabling reduction of material input due to reduced consumption of electric steel, winding copper, and high-voltage insulating materials. Novelty is also that cooling of stator core butt-end part is organized over single-jet circuit in which gas flows over radial cooling ducts between iron stacks from stator core periphery to end windings thereby raising cooling effectiveness for stator core butt-ends and ensuring electrical machine running consuming reactive-power. Total gas flow circulating in electrical machine cools down stator end windings and its butt-end structural components which makes it possible to dispense with any additional delivery sources for cooling these components.

EFFECT: enhanced efficiency due to reduced windage loss, augmented cooling efficiency of stator core and winding, and reduced material input.

1 cl, 1 dwg

The invention relates to the field of electrical and electric engineering, in particular to two induction generators DC

FIELD: electric engineering.

SUBSTANCE: invention relates to electric engineering, namely - to electric machines, and deals with the specific features of fixing elements design for electric motors, particularly, fan sets intended for heating, ventilation and/or air-conditioning plants. This invention proposes a device (40) for fixing electric motor (16) containing accommodating seat (41) for motor installation with a wall (42). According to the invention, the device (40) for fixing electric motor (16) implemented so that the first (18A) and second (18B) air pumping element can be rotated. The air pumping element includes accommodating seat (41) to install electric motor (16) and a wall (42). Besides, the obstructing elements (60, 62; 72, 74, 76; 80) are placed between the electric motor (16) and accommodating seat (41) wall (42). The obstructing elements are implemented so that they can obstruct air flowing between electric motor (16) and wall (42) of accommodating seat and air flow be redirected through electric motor (16).

EFFECT: improved cooling of electric motor and ensured control of different heating, ventilation and/or air conditioning equipment parameters.

21 cl, 9 dwg

FIELD: electricity.

SUBSTANCE: asynchronous machine (VAMOGW) includes frame (1) with multipack stator (2) with winding (3), at monolithic shaft (6) made of steel 20X13 there is multi-pack rotor (7) with copper bars (8) and cafe rings (9). Between packs of stator (2) and rotor (7) there is non-magnet gap (5) through which cooling stratum water passes. In order to prevent contact corrosion of electric steel of stator and rotor packs and copper of rotor winding discs (10) of magnesium alloy are pressed-fit between packs on rotor shaft and rings (4) of the same alloy are pressed-fir between stator packs. Discs (10) and rings (4) have close electric contact with packs of rotor (7) and stator (2).

EFFECT: effective electrochemical protection from contact corrosion for internal parts of multipack rotors and stators of vertical open electric machines at their immersion to aggressive stratum water - electrolyte.

3 dwg

FIELD: electricity.

SUBSTANCE: asynchronous machine (AMV OGW) contains housing (1) where multipack stator (2) with winding (3) is accommodated, on shaft (5) made of 20X13 steel, multipack rotor (6) with screw-groove multistart thread is mounted for strata water pumping via non-magnetic operating clearance (10). To equalise temperatures throughout the machine the inlet of cold and the outlet of heated strata water is executed through alternating by length symmetrical groups oh holes in the housing (14-16) and (17-18), shifted by angle β/2 relative to each other, and the holes along cross-section radius are shifted by angle β in each group. Flow of strata water via three hemispheric channels (21) between stator and housing, shifted by 120° equalises temperature along stator length.

EFFECT: creation of effective system of cooling with surrounding strata water for internal active parts of multipack electric machines of vertical open configuration for oil-and-gas wells.

2 cl, 3 dwg

FIELD: electricity.

SUBSTANCE: invention refers to the field of electric engineering, namely to cooling system of electric machines of cylindrical design. Proposed electric machine comprises stator, including winding of stator, body for stator location, rotor and air gap, having, in general, a cylindrical configuration. Multiple radial first channels of cooling gas arranged along circumference is provided in the stator core. Jets of cooling gas are directed in the area of front part of winding, which is relatively distanced from stator core in order to provide for its forced cooling. Flows of cooling gas are directed to sections of front part of winding, which is located between areas with forced cooling of front part of winding and according front surface of stator core. At the same time electric machine comprises at least one of injection and suction fans, and in specified body for stator location there are the first, second, third and fourth openings. Besides, injection fan is connected along flow of cooling gas with specified first channels of cooling gas, and also to specified first, second, third and fourth openings of specified body; and suction fan is located in connection along flow of cooling gas with those spaces in electric machine, which receive cooling gas, released from air gap and specified first, second, third and fourth holes. At the same time specified first and second holes have smaller diametre than specified third and fourth specified holes of body for stator location.

EFFECT: provides for intense cooling of front part of electric machine stator winding and elimination of damage of insulation of winding wires, and also low consumption of power in proposed design of cooling system suitable for electric machines with high speeds of rotation.

19 cl, 1 dwg

FIELD: electrical and mechanical engineering; revolving electrical machines such as turbogenerators using closed-circuit cooling cycle.

SUBSTANCE: proposed air-cooled electrical machine using closed-circuit cooling cycle has frame accommodating stator and closed with end shields, each of the latter being provided with box-shaped sections disposed around rotor and ducts used to pass sealing air to box-shaped section from electrical-machine cooling system; in order to prevent ingress of dirt to box-shaped sections the latter are divided into compartments by means of transverse partitions; ducts feeding air to box-shaped space of each compartment are disposed along rotor revolution immediately past the partitions.

EFFECT: enhanced efficiency of electrical machine protection against ingress of dirt due to creating more efficient air flow preventing ingress of dirt from environment.

2 cl, 3 dwg

The invention relates to the field of electrical engineering and can be used in designing electric vehicles for land transport

The invention relates to electrical engineering, in particular, to a cooling system closed electrical machines

The invention relates to the field of electrical engineering

Electric machine // 2173018
The invention relates to electrical engineering and for their cooling electric machines

Electric machine // 2148885
The invention relates to electric machines with rotating rotor and can be used in the mechanisms of industrial and household products

Thyratron motor // 2454776

FIELD: electricity.

SUBSTANCE: active element represents two-sectional winding from isolated current conducting tape that has narrow transverse notches alternating from one and the other sides of the tape and forming slots in section ends at tape winding. The slots of two sections are shifted to the half of rotor magnet pole pitch. The beginning and the end of the tape of each section are connected to the switchboards that control the signals of rotor position sensor. The winding is located in the gap between rotor magnet and magnetic core and is mounted directly to the engine housing providing a better heat removal.

EFFECT: increase of engine moment by means of heavy current supply through active element.

7 dwg

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