FIELD: electrical engineering.
SUBSTANCE: in the suggested generator containing permanent magnets at rotor, fan and electronic module according to the invention in the area of radial surfaces of the stator end windings there is a centrifugal radial fan made in form of plates at the rotor, at that axes of magnets at the rotor are located at the angle towards the rotor axis and electronic module is located in space between the stator winding and rotor shaft.
EFFECT: increased reliability and reduction of generator dimensions.
The technical field to which the invention relates.
The invention relates to the field of electrical engineering and can be used in generators for Autonomous power sources, such as electric cars.
The level of technology
The generators for Autonomous power sources meet strict requirements for reliability, resource, size, specific energy indicators, noise.
As analogues of the invention are known brush generators, for example, 2110-37010 for VAZ, 16.3701 for cars "Volga", 581.3701 for cars "Moskvich", containing beak system console spaced magnetic poles, axial fans in the form of impellers, and built on top electronics rectifiers (see, for example,  - P. Chizhkov, SERGEY Akimov. Electrical cars. - Publishing house "Behind the wheel", 1999, p.102-106). The drawbacks are: irrational use of the size of the generator due to consecutive locations in their additional volumes axial fans, impellers, electronics and parts brush-collector node; insufficient efficiency axial fans, impellers, blowing a small surface coil (direction of airflow only to the front end parts of the winding); in the high revs increased magnetic noise and dynamic loads from magnets because of their beak cantilever design; the presence of wear and maintenance-brush-collector node; low manufacturability of the Assembly and disassembly of the pressed parts of the rotor. All this reduces the reliability of specific indicators and increases the size of the generator.
As a prototype of the proposed technical solutions known brushless generator according to the patent of Russian Federation №2244996, which solves some of the shortcomings of the devices equivalents due to exclusion from the construction of the brush-collector node, use technology easily removable rotor with magnets, separated from the stator by an air gap. However, in the device prototype deficiencies remain associated with the inefficient use of overall volumes due to the need of the location of the fans and electronics modules in the additional volumes, with the lack of effectiveness of conventional axial fans, impellers and with considerable alternating radial dynamic loads (tienimi) from the magnets on the rotor when the generator.
The essence of the invention.
To eliminate these disadvantages of the known devices, generators, improve reliability and reduce dimensions, offers a new technical solution, in which in the area of the radial surfaces of the end parts of the stator winding mounted centrifugal radial is the fan in the form of plates on the rotor, the axis of the magnets on the rotor are arranged at an angle to the axis of the rotor, and the electronics module is located in the space between the stator winding and rotor shaft.
The centrifugal radial fan in the zone of the radial surfaces of the stator winding can increase the area of cooled surface of the array of wires windshields parts of the stator winding due to several times larger area of these surfaces compared to the area of the end surface of the frontal parts, blown in known devices in the axial direction, which improves the cooling efficiency of the windings.
The location of the electronics in the free volume between the stator winding and the axis of the rotor allows to reduce the size of the generator as a whole and to improve the cooling of the electronics unit from the same radial centrifugal regulator.
The axes of the magnets at an angle to the axis of the rotor reduces the dynamic alternating radial impact on the rotor magnets, which reduces the magnetic noise and improves the reliability of the generator.
All this allows to reduce the size of the generator, to improve the cooling of the windings and to reduce dynamic loads and noise, which improves reliability and specific parameters of the generator as a whole.
A brief description of the invention. Variant of implementation and the essence of the proposed is subramania explains the figure, showing: 1 - rotor shaft; 2 - bearing; 3 - generator housing; 4 - pack iron stator; 5 - excitation winding; 6 - stator winding; 7 - the elements of the radial impeller of the centrifugal fan mounted on the rotor and spaced around the circumference of the rotor; 8 - body of the rotor which has permanent magnets 9, as in the prototype, staggered around the circumference of the rotor to the left and to the right relative to the centerline of the cylindrical surface of the rotor; 10 - electronics module (rectifier diodes and electronic controller). The arrows show the direction of blowing of the windings 6 of the stator. Ψ is the angle of the slant axis of the magnetic circuit of one of the magnets 9 in the housing 8 of the rotor is shown by the dotted line) relative to the axis of the shaft 1 of the rotor.
The operation of the device. The impeller 7 of the centrifugal radial fan located on the housing 8 of the rotor on its circumference, are located on the radial side of the frontal parts of the windings of the stator and rotor effectively fanned them across the radial space windshields parts, making the generator more power without overheating the windings. The electronics module 10 is free niche between the windings 6 of the stator and the shaft 1 of the rotor, which reduces the size of the generator as a whole and further used for cooling unit airflow from the impeller 7 radial centrifugal Venti is atora. The bevel of the axes of the permanent magnets on the angle Ψ relative to the axis of the shaft 1 of the rotor allows to reduce the dynamic loads on the rotor. The optimal value of Ψ is chosen for each specific version of the generator.
Thus, the proposed device allows to reduce the size of the generator and dynamic loads on the rotor and to increase the efficiency of heat dissipation, which ultimately provides improved reliability, specific energy performance and reducing the size of the generator as a whole.
Generator with permanent magnets on the rotor, fan, oscillator, characterized in that, to improve reliability and reduce the size, the area of the radial surfaces of the end parts of the stator winding mounted centrifugal radial fan in the form of plates on the rotor, the axis of the magnets on the rotor are arranged at an angle to the axis of the rotor, and the electronics module is located in the space between the stator winding and rotor shaft.
SUBSTANCE: in the proposed blower with an electric motor (3) driving the blower impeller the electric motor is placed in the corresponding housing (2) and has a collector (8) with at least two brushes (9), each of them generating across the corresponding contact surface (9a) wherealong it contacts with the collector (8) and is designed so that to enable the collector cooling with a cooling air flow tapped from the air flow produced by the blower impeller and vented into the ventilation channel (10) in the housing (2) of the electric motor (3). An air distributor (20) dividing the cooling air flow into at least two partial cooling air flows is envisaged in the ventilation channel (10). According to the present invention, the ventilation channel (10) ends in the cover (1) of the electric motor housing (2) with a tail part (18) with two guiding surfaces (21) installed at an angle to the cooling air flow direction (17); the surfaces ensure immediate and direct delivery of the partial cooling air flow divided by the air distributor (20) to the corresponding contact surfaces (9a) of the brushes.
EFFECT: enhancement of cooling efficiency of the said type blower electric motor.
7 cl, 2 dwg
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
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
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 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.
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
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: engines and pumps.
SUBSTANCE: proposed permanent magnet motor consists of n equal modules, each of which includes a housing, a stator with phase windings, a rotor with constant magnets, which are magnetised in radial direction. Similar phase windings of adjacent modules are connected in series, housings and rotors of modules are connected to each other mechanically, and each module includes circular orientation elements of the stator with phase windings and rotors. At that, according to this invention, in each rotor, one half of magnets is offset relative to the other half in a circumfenertial direction by the half of the tooth division of stator tzs, and in adjacent modules, similar magnets of rotors are offset in a circumferential direction through value tzs/(2n).
EFFECT: improvement of start-up properties of permanent magnet motor owing to reducing pulsations of reactive moment; providing reliable connection of modules and permanent magnet motor as a whole.
2 cl, 5 dwg
SUBSTANCE: invention refers to design of contactless magnetoelectric machines with electromagnetic reduction, and can be used in direct drives, in automation systems, in mechanisms with high moments on the shaft and low rotation frequencies of the shaft, as well as high-frequency electric generators and synchronous frequency converters. The proposed reduction magnetoelectric machine with pole gear-type inductor includes stator, the armature core of which is charged and has salient poles, on inner surface of which elementary teeth are made, coil m-phase armature winding, each coil of which is arranged on the corresponding salient pole of the armature, one on each pole, and rotor containing an inductor with toothed poles with equal number of elementary teeth on each pole, which are symmetrically distributed along cylindrical surface; constant magnets magnetised in tangential direction are located between toothed poles of the inductor. When performing certain relations between the number of salient poles of the armature, number of elementary teeth on salient pole of the armature, number of salient armature poles in the phase, total number of armature teeth, number of toothed poles of the inductor, total number of inductor teeth, number of elementary teeth on toothed pole of the inductor and number of phases of m-phase armature winding of reduction magnetoelectric machine with pole toothed inductor, the method is implemented.
EFFECT: providing high power and operating characteristics, high specific torque moment on the shaft and high electromagnetic reduction of rotation frequency in electric motor mode, as well as high specific power at high EMF frequencies in electric generator mode.
5 cl, 5 dwg
SUBSTANCE: electric motor comprises a salient-pole stator with a control winding and a rotor with poles from permanent magnets arranged on ends and adjacent parts of side surfaces of a rotor magnetic conductor. Between adjacent magnets of the rotor pole arranged on the end and adjacent parts of side surfaces of the rotor magnetic conductor, additional magnets are introduced, polarity of which matches polarity of the rotor pole.
EFFECT: higher efficiency of operation of a magnetic system of an electric rotor and its specific torque and efficiency increase.
FIELD: electrical engineering.
SUBSTANCE: magnetoelectric machine rotor system consists of two coaxial rotors. The external (outer) rotor is designed in the shape of a hollow cylinder of high-strength, non-magnetic and electrically non-conductive material with constant magnets uniformly fixed thereon; the magnets are magnetised in a radial direction and have alternating polarity. There are gaps between the external rotor magnets wherein the retaining elements are positioned made of a non-magnetic and electrically non-conductive material. The internal rotor is designed in the shape of a shaft of a magnetically soft material, toothed on the outside, the internal rotor teeth number equal to that of the external rotor permanent magnets. The internal rotor radial bearings are positioned outside the external rotor bearings. The external rotor axial bearing is represented by axial magnetic forces of interaction between the permanent magnets of the external rotor, the stator core and the shaft.
EFFECT: provision for the rotor system rotors strength margin and increasing the proper frequency to a value in excess of rotation rate.
16 cl, 3 dwg
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
SUBSTANCE: invention describes direct rotation generator that includes holder of iron cores and rotating shaft arranged on holder of iron cores. The first and the second rotating discs are located on two corresponding ends of rotating shaft. The first iron core is located on holder of iron cores, and the first winding is located at the periphery of holder of iron cores. The first sealing plate is located on the first rotating disc; the first magnet is located on the first rotating disc or on the first sealing plate, and surface of the first magnet and surface of the first sealing plate share one surface. The fourth magnet is located on the second rotating disc. The first magnet and the fourth magnet correspond to two ends of the first iron core, and poles of the first and the fourth magnets, which face each other, are opposite. One end of the first iron core includes liquid tank that is filled with magnetic liquid; at that, end of the first iron core, which is filled with magnetic liquid, contacts the first sealing plate. The main magnetic flux of direct rotation generator and magnetic flux created with induced current are horizontal and parallel to iron core, which considerably reduces the impact of resistance on rotation of iron core and magnets.
EFFECT: saving of energy for generation of electric energy and increase in generator efficiency.
10 cl, 5 dwg
SUBSTANCE: in the method to control a frequency-controlled induction electric drive with a short-circuited rotor there is a setter used arranged as a relay controller, from which a signal of optimum accuracy arrives to an input of frequency converter speed control. A tracking system comprises a frequency converter implementing vector control, an induction motor with a short-circuited rotor. The setter comprises a sensor of phase currents, a sensor of instantaneous speed signal value, a sensor of phase voltages, a converter of current phase number, a vector-analyser, a converter of voltage phase number, rotators of current and voltage, a unit of parametric coefficients, a unit of switching function coefficients, a unit of summators, a unit of multiplication, a summator, a unit of setting signals, a unit to produce a setting signal for rotor flux linkage and an appropriate coefficient of PI-controller, a unit to produce a setting signal for rotor flux linkage and an appropriate PI-controller coefficient, a relay with high switching frequency, a scaling unit, a multiplier, a selector and a switch connected as specified in application materials.
EFFECT: production of control of optimum accuracy over speed of shaft rotation in a frequency-controlled asynchronous electric drive with a short-circuited rotor.
2 cl, 1 dwg
SUBSTANCE: electric motor (1) consists of the first structure (4) that includes some magnetic poles formed by a certain sum of magnetic poles (4a) organised in certain direction and arranged in such a way that every two neighbouring magnetic poles (4a) have polarity that differ from one another, the second structure (3) that includes some armatures located opposite to the said magnetic poles for generating movable magnetic fields moving in certain direction between the row of armature and row of magnetic poles under the influence of certain sum of armature magnetic poles generated in the armatures (3c - 3e) at electric power supply to them, and the third structure (5) that includes a row of elements from magnetic-soft material formed by certain sum of elements (5a) from magnetic-soft material organised in certain direction with a one gap in relation to the other and arranged in such a way that a row of elements from magnetic-soft material is located between a row of magnetic poles and a row of armatures, number of magnetic poles (4a) and number of elements (5a) from magnetic-soft material is determined by the ratio 1 : m : (1 + m)/2 (m ≠ 1.0).
EFFECT: decrease of dimensions and manufacturing cost of the said electric motor with simultaneous provision of possibility to increase freedom degree at its designing.
6 cl, 19 dwg
SUBSTANCE: axial two-input contactless dynamo includes body, permanent multipolar magnet of induction coil subexciter, lateral axial magnetic conductor with polyphase armature winding of subexciter, single-phase winding of subexcitor and auxiliary excitation winding of exciter which is connected to DC power supply source through contacts, inner axial magnetic conductor with polyphase armature winding of exciter and single-phase excitation winding of main generator, lateral axial magnetic conductor with polyphase armature winding of main generator, shaft fixed in bearing assemblies and rigidly bound with permanent multipolar magnet of induction coil subexciter and inner axial magnetic conductor by means of respective discs. Single-phase excitation winding of exciter is connected to polyphase armature winding of subexciter through polyphase double-wave rectifier. Single-phase excitation winding of main generator is connected to polyphase armature winding of exciter through polyphase double-wave rectifier.
EFFECT: possibility of adding and conversion of mechanical power and DC electrical power into AC polyphase electrical power, simplification of magnet system manufacturing technology, quality improvement of generated voltage.
SUBSTANCE: electric machine rotor comprises a hollow shaft of non-magnetic material and a cylinder placed on it made of magnetic-soft material with high magnetic permeability, in longitudinal radial slots of which there are permanent magnets fixed with non-magnet metal wedges, the outer surface of which complies with curvature of the outer surface of the cylinder, at the same time, according to this invention the cylinder is rigidly fixed to the hollow shaft and non-magnet metal wedges along the entire area of their contacts, and rotor ends are rigidly fixed with cylindrical bushings made of non-magnetic material, coaxial and rigidly fixed with the hollow shaft, besides, cylindrical bushings are equipped with through bores aligned in parallel to the longitudinal axis of the cylinder, at the same time the through bores match longitudinal radial slots of the cylinder in quantity and location and exceed their dimensions by the value sufficient for free passage of permanent magnets through them, besides, the permanent magnets are equipped with facilities of their fixation in longitudinal radial slots of the cylindrical bushings, besides, the external surface of the cylinder is equipped with a bandage made by winding of a flexible thread from high-strength non-magnetic material, for instance, a carbon fibre, at the same time the external surface of the bandage is of cylindrical shape that complies in diameter and roughness to the specified cylindrical bushings. Threads in the bandage are fixed by impregnation with hardening synthetic resins. Facilities for fixation of permanent magnets in longitudinal radial slots of the cylinder are made of parts from non-magnetic material that follow the cross section of through bores in the cylindrical bushings and are tightly installed in the through bores, in contact with the ends of the permanent magnets. Besides, the free end of at least one cylindrical bushing is closed with a screwed-in or a pressed cover. Besides, to fix the rigidly connected parts of the rotor, vacuum-diffusion welding is used.
EFFECT: considerable improvement of the electric machine rotor mechanical strength, increased resource during its operation at increased and high frequencies of rotation due to arrangement of the gas bearing between the bushing placed in the stator and fixed in the end shields, and the rotor, which provides for the possibility to reject frictionless bearings, this electric machine rotor does not have sagging, since the rotor surface is used as the journal.
5 cl, 4 dwg
SUBSTANCE: low-speed end synchronous generator comprising a rotor arranged in the form of a disc from a non-magnetic material with an excitation system based on permanent magnets and a stator with coils, comprises sections, at the same time in each section a stator is made of one circular magnetic conductor arranged in parallel to the rotor and fixed on stiffening ribs of a casing-free generator frame, coils of stator are placed fully in slots, not protruding beyond limits of a magnetic conductor, in an excitation system the permanent magnets are installed on a rotor disc at its one lateral side in parallel to a magnetic conductor of a stator, besides, rotors of each section are arranged on a single shaft, at the same time to coordinate operation of generator sections, a rotor of each following section is displaced relative to the rotor of the previous section by the following angle: Jmag. = 360° : quantity of permanent magnets of the rotor: quantity of generator sections.
EFFECT: reduction of dimensions due to its execution of several sections, considerable reduction of generator diameter, which is especially important for submersible mini hydraulic power plants, reduction of generator weight due to the fact that its units are fixed on the frame of stiffening ribs, and a rotary rotor is equipped with a protective rim, which eliminates the necessity to use a solid casing, increased efficiency factor due to complete usage of stator coil turns placed fully in slots of a magnetic conductor and not having head parts protruding beyond its borders, making it possible to modify generator low speed when used on rivers with various speed of water flow, which is provided by variation of sections number and displacement of a rotor in each section relative to a rotor of a previous section by an angle between magnets, increased reliability of generator's operation, since availability of a frame from stiffening ribs improves cooling of stator coils protecting them against heating.