Borehole motor |
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IPC classes for russian patent Borehole motor (RU 2516472):
      
 Electric machine / 2489788
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.
 Submersible water-filled synchronous generator of vertical design / 2483417
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.
 Machine with retaining bearing with antifriction layer from liquid metal / 2483414
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).
 Electric spindle / 2479095
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.
 Electric machine / 2477916
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.
 Electric machine / 2474945
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.
 Plain thrust-journal bearing on shaft driving end of asychronous machine of vetohin for oil-and-gas wells (amv ogw) / 2449455
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).
 Radial thrust plain bearing on idle shaft extension of vetockhin induction motor for oil-and-gas wells / 2444831
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.
 Noncontact electric motor / 2424611
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.
 Hydrogenerator / 2418979
Hydrogenerator includes rotor 1, oil bath of centre plate, which has external and internal walls 3 and 6, support elements 4, cover 7 and condensers 8 of oil vapours and detachable ring filter 9, gravity filter 10 and water ejector 11, which are arranged on cover 7 and attached to each other and through condenser 8 to air cavity of oil bath, absorption cooling chambers with oil receiver, non-return valve 13 and tight valve 22. In oil bath there installed are flexible U-shaped pipelines 23 which are rigidly pressed by means of clamps to walls 3 and 6 of oil bath and to its bottom 2. Inlet edges of face of pipelines 23, which are adjacent to wall 6, are located in air cavity of oil bath restricted with rotor 1 and wall 6 and above level of oil filling the oil bath. Outlet edges of pipelines 23 which are adjacent to wall 3 are located in air cavity of oil bath restricted with rotor 1, wall 3 and cover 7 and above level of the oil filling the oil bath and inlet edges of pipelines 23 which are adjacent to wall 6.
 Permanent-magnet synchronous motor for drainage pump / 2516377
Present invention relates to electrical engineering, particularly electrical machines, and peculiarities of making permanent-magnet synchronous motors for a drainage pump. The disclosed synchronous motor comprises a permanent-magnet rotor for rotating the a rotor wheel, a pump housing on which the permanent-magnet rotor rests, a stator core and a stator coil. According to the invention, the stator coil has a winding made of aluminium enamelled wire and is provided with a part for connection by welding the lead wire of said winding with a contact for connecting with the lead wire; the winding is hermetically insulated in a protective housing; the outer surface of the part for connection by welding of the lead wire of the winding made of aluminium enamelled wire is tin-plated by soldering or tin electroplating, wherein the part for connection by welding of the lead wire, tin-plated by soldering or tin electroplating, is welded to the contact for connection with the lead wire; the outer surface of the winding made of aluminium enamelled wire is first coated with insulating paper tape and then hermetically insulated by said protective housing.
 Stator of rotating electric machine excited by permanent magnets / 2516367
Stator has a variety of segments located close to each other in the circumferential direction. According to the invention the above segments have teeth and slots passing in the longitudinal direction of the stator, at that the neighbouring segments touch each other at the segment boundary and teeth of the neighbouring segments are located so that at the segment boundary a tooth of one segment touches the tooth of the neighbouring segment, herewith the total width of the teeth touching each other at the respective boundary is bigger than the total width of the majority of teeth which are not placed at the segment boundaries or all teeth which are not placed at the segment boundaries directly, at that the minority of teeth not placed directly at the boundary of the specified segments has the same width, which is bigger than the total width of the majority of teeth which are not located directly at the segment border.
 Permanent magnet machine / 2516270
Permanent magnet machine contains a fixed stator and a movable rotor made of non-magnet material, in the stator frame there are U-shaped imbricated cores with windings, the rotor contains operating components made as the permanent magnets placed in the openings in the form of slots with size l and l1, at that the number of slots m is equal to the number of the permanent magnets. At that the stator frame of the permanent magnet machine is made as a hollow cylinder with at least 3 groups of U-shaped imbricated cores with windings placed at its inner surface. Each group contains at least 3 U-shaped imbricated cores with windings interconnected in series and shifted in regard to each other per the distance L. The rotor is placed inside the stator and consists of a hollow cylinder with the permanent magnets placed in its slots and shifted in regard to each other per the angle of α=120°, poles of the permanent magnets protrude the limits of the hollow cylinder per a value Δ: Δ=d-l', where Δ is a value of the magnet poles protrusion outside the limits of the hollow cylinder; d is a circle diameter defined by the inner diameter of the stator and sizes of the magnet core; l' is a value of the air gap between the magnet core and the magnet.
 Single-phase generator with annular armature winding / 2513986
Invention relates to electrical engineering and design of electrical machines, particularly single-phase alternating current generators. The technical result achieved by using the present invention is considerably high efficiency and improved electromechanical properties of single-phase generators. Said technical result is achieved due to that in a single-phase synchronous generator with an annular armature winding, consisting of an armature and an inductor, separated by an air gap, according to the invention the armature consists of two series-connected annular windings with semi-annular ferromagnetic cores, the nearest rectangular ends of which are attached by nonmagnetic bushings, and the inductor consists of a central cylindrical core mounted on a rotating shaft, wherein on diametrically opposite surfaces of the core there are two rod-shaped permanent magnets with concave like poles. During operation of the generator, turns of the annular windings are penetrated by induction field lines of one direction, originating from like poles of the permanent magnets of the inductor.
 Low-speed current generator / 2510565
Low-speed current generator has, mounted on a shaft, a rotor with a multipolar system of permanent magnets, a stator in form of a magnetic conductor and stator windings, leads of which are connected to corresponding rectifier units, a high-frequency pulse master generator and as many power correctors as there are rectifier units, each connected to the output of the corresponding rectifier unit and control inputs of which are connected to the output of the high-frequency pulse master generator, wherein the stator is single-sectional, and the number of poles of the rotor differs by one from the number of stator windings, the stator being cogless.
 Magnetic generator / 2507667
Magnetic generator comprises a non-magnetic body, in which cores of working windings of a stator and a rotor made of non-magnetic material are fixed and evenly distributed along the circumference. Cores of the working winding of the stator consist of an H-shaped magnetic conductor and two fixed DC electromagnets installed at its ends, and mobile DC electromagnets are fixed on the rotor. Poles of DC electromagnets of the rotor are aligned in turns as like and unlike towards the specified poles of DC electromagnets of the H-shaped magnetic conductor. During rotor rotation, as at least one DC electromagnet of the rotor aligned in a heteropolar manner approaches one DC electromagnet of the H-shaped magnetic conductor of the stator working winding, the magnetic flow between their poles is closed, and inducing of electromotive force on the working winding of the stator is provided by two other DC electromagnets of the rotor and stator aligned in a unipolar manner. Simultaneous interaction of DC electromagnets of the rotor and stator aligned in a unipolar and heteropolar manner creates an effect of magnetic balance.
 Rotor and method to manufacture rotor of electric machine / 2499342
Method to manufacture a rotor (14) is proposed for an electric machine (13), including the following stages of its realisation: a) manufacturing of a magnetic element (8) by means of adhesion of permanent magnets (1, 1', 1", 1'") to each other with the help of the first glue, at the same time each permanent magnet (1, 1', 1", 1'") has one side (2) with the magnetic north (N) and one side (3) with the magnetic south (S), at the same time permanent magnets (1, 1', 1", 1'") when adhered are arranged so that sides of the magnetic north (N) or sides of the magnetic south (S) form a common lower side (3, 3', 3", 3'") of the magnetic element (8), at the same time the first glue in the hardened condition has the solid consistency; b) adhesion of the lower side of the magnetic element (8) with the yoke (12) with the help of the second glue, at the same time the second glue in the hardened condition is soft and elastic, which eliminates break of the second glue as the temperature of expansion of the magnetic element (8) and the yoke (12) increases. At the same time the yoke (12) in the place where the magnetic element (8) is adhered to the yoke (12), has the soft and elastic layer (2).
 Machine with transverse magnetic flux (versions) / 2496213
Electric machine with transverse magnetic flux includes at least three phases, each of which is formed with core stator and windings. All the above phases are arranged in common housing. Parallel connected electric lines are branched from the above phases. There is also current converter from current source, which is formed with inductors connected in each of the above electric lines, switching circuit and switching capacitors. All the above components are placed in common housing. Two versions of the present invention are proposed.
 Electric motor / 2490772
Electric motor contains a rotor with pole permanent magnets magnetised radially and number of poles more than two and a stator consisting of a magnet core in the form of a hollow cylinder and a symmetrical three-phase biplane single-layer winding at inner surface with minimum gaps required for stator assembly between lateral surfaces of working areas of the coils. Working areas of the coils are located along the electric motor axis; at that number of coils in a phase circuit is selected as equal to the number of pole permanent magnets of the rotor.
Electric machine / 2489788
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.
 Rotor of electric machine / 2516440
Rotor of the electric machine contains a shaft, a magnet core made of equally alternating magnet and non-magnet circular plates, permanent magnets with pole tips and a cylindrical non-magnet cage covering them from the side of the external surface. The permanent magnets with pole tips are installed in windows of the above cage. At that according to the invention the permanent magnets are made so that the radius centre of the external cylindrical surface of each magnet is shifted along the longitudinal magnet axis towards the external surface of the non-magnet cage forming a smooth increase in the cage cross-section above the magnet and pole tip from the magnet longitudinal axis towards its lateral sides. Mechanical stress occurring in such design of the rotor is distributed evenly across the cross-section of the above non-magnet cage over each permanent magnet with pole tip from the magnet longitudinal axis towards its lateral sides during operation of the electric machine.
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FIELD: engines and pumps. SUBSTANCE: invention relates to electrical engineering and machine building, particularly, to borehole motors to lift bed fluid. Proposed borehole motor comprises stator with toothed magnetic core accommodating the rotor. Stator teeth internal surface has grooves regularly arranged in circle in axial direction, the number making three, or being multiple of three. EFFECT: lower reactionary torque, hence, vibration, better starting properties. 2 cl, 8 dwg, 2 tbl
The invention relates to the field of electrical and mechanical engineering, in particular to submersible electric motors for lifting reservoir fluid. Known submersible motor contains a stator with a toothed magnetic core on the inner surface of which is made in the axial direction of the grooves, and placed inside the rotor (USSR author's certificate No. 255397, NC 5/12, publ. 31.03.1970). The disadvantage of this design is the increased torque reaction due to the presence in the bore of the engine two diametrically located grooves, which serve for fixing the bearings. The closest to the technical nature of the claimed is a submersible electric motor contains a stator with a toothed magnetic core on the inner surface of which is made in an axial direction, one or two slots, and placed inside the rotor (patent RU 2192700 C1, H02K 5/16, F04D 13/08, publ. 10.11.2002). Known motor has a higher torque reaction due to the fact that during the rotation of the magnetic field, due to uneven magnetic conductivity of the gap, arise pulsation of the magnetic flux. The reactive torque causes the increase of the amplitude of vibration and degrades the reliability of the start. In submersible motors with excitation from permanent magnets, the influence of the torque reaction have what is stronger than in asynchronous motors. To reduce reactive torque of asynchronous motors apply the angular displacement of the packages of the rotor half subcatego dividing the stator, and the motor with excitation from permanent magnets - additional angular movement of the magnets in the package. However, the reactive torque of these technical solutions do not resolve properly. The present invention is to reduce vibration and improve the starting properties submersible motors by reducing reactive moment. This technical result is achieved due to the fact that in a submersible motor, containing the stator teeth, the magnetic core on the inner surface of which is made in the axial direction of the grooves, and placed inside the rotor on the inner surface of the stator is made of three or multiples of three, the number of grooves equally spaced around the circumference of the inner surface of the stator. In addition, in the particular case of implementation in a submersible motor with excitation from permanent magnets, the rotor is constructed with staggered magnets package. The invention is illustrated by drawings, where figure 1 presents the proposed incision submersible motor with three grooves; figure 2 - a section of a submersible electric motor with 12 slots; figure 3 - pack of the rotor with permanent magnets; figure 4 - pack of the rotor, a bias magnet package; figure 5 is a plot of the specific (per unit length of the active part of the motor) torque reaction from the angular position of the rotor when the number of grooves 1, 2 and 3 on the inner surface of the stator; figure 6 is a graph of dependence of specific reactive torque from the angular position of the rotor when the number of grooves 2, 6 and 12 on the inner surface of the stator; figure 7 is a graph of dependence of specific reactive torque from the angular position of the rotor when the number of grooves 1, 2 and 3 on the inner surface of the stator for the motor, the rotor of which is made offset magnets package; Fig is a graph of dependence of specific reactive torque from the angular position of the rotor when the number of grooves 2, 6 and 12 on the inner surface of the stator for the motor, packages magnets of the rotor which is made with offset. Submersible motor includes a stator 2 and the rotor 3. On the inner surface of the stator 2 are grooves 1, evenly spaced on its circumference (Fig 1, 2). Slots 1, made in the axial direction, are designed for protection of the outer ring of the bearing from rotating and used in the Assembly of the stator pack. The number of grooves is equal to or a multiple of three. Depending on the number of grooves is changed, the maximum value of the reactive moment. Design terminal connection or lead is of IKI slip, used in submersible induction motors and motors with excitation from permanent magnets similar to. In engines with excitation from permanent magnets (3) half of the magnets 4 pack shifted by half subcatego dividing the stator (figure 4). The proposed solution allows for minimal design change drastically reduce reactive torque.
Table 1 shows the estimated typical ratio of useful and reactive moments when equal currents in the armature winding for different numbers of grooves on the inner surface of the stator (1, 2) for different designs of the rotor (Fig 3 and 4). From table 1 and the graphs in figure 5, 6, 7, 8 it follows that in the engine with the number of grooves to 3N, where N=1, 2, 3..., on the inner surface of the stator, the amount of reactive torque is reduced. But with the increasing number of grooves is reduced and the amount of useful time, due to the increase of the equivalent magnetic gap. Optimal, from the point of view of the ratio of reactive and useful moments, the result is achieved when the three grooves on the inner surface of the stator. Table 2 shows the estimated typical ratio in percent of the useful and reactive moments when equal currents in the armature winding for different numbers of grooves on the inner surface of the stator for an electric motor with 7 pairs of poles on the rotor, made without bias magnets of the package. As a source for comparison of the selected design with two diametrically spaced grooves on the inner surface of the stator and 7 pairs of poles on the rotor. As in the previous case, the optimal result is achieved when the three grooves on the inner surface of the stator.
Thus, the proposed design reduces torque reaction that helps to reduce vibration and improve the starting properties of submersible motors. 1. Submersible motor contains a stator with a toothed magnetic core on the inner surface of which is made in the axial direction of the grooves, and placed inside the rotor, characterized in that on the inner surface of the stator is made of three or multiples of three, the number of grooves equally spaced around the circumference. 2. Submersible motor according to claim 1, characterized in that the rotor is constructed with packages Kee is different magnets, located offset in the circumferential direction.
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