Induction generator

FIELD: electrical engineering; specific electrical machines for off-line power supplies.

SUBSTANCE: proposed self-excited induction generator designed for operation under abnormal environmental conditions and in hermetically sealed power-generating units has squirrel-cage rotor and core-shaped stator with Z teeth whose slots receive stator winding, as well as field capacitors; novelty is that stator winding is made in the form of Z bars closed on one end by means of end ring. Generator also has additional magnetic core with slots receiving three-phase winding and conducting bars connected on one end with Z bars of stator winding and on other end they are closed by means of other end ring to form Z-phase winding.

EFFECT: enhanced reliability, reduced mass and size of induction generator.

5 cl, 3 dwg

 

The invention relates to the field of special electrical machines, in particular to the design of asynchronous generators (AG) with excitation used in the units of the Autonomous power supply.

Known AG with self-excitation, containing the rotor squirrel cage winding and located across the working gap of the stator in the form of a core with Z prongs placed in the slots of a stator winding connected to the load and the capacitor excitation [1, s-592].

Known construction AG have known and undoubted advantages: simplicity and high reliability, low cost, low sensitivity to short-circuit, etc. Into force of this AG are being increasingly used as a generating device for renewable electricity, to power on-Board networks of mobile objects and other Modern trends in development of power industry suggests that in these areas for Autonomous power power power up to 400 kW the most useful application of AG instead of synchronous generators.

However, traditional AG have shortcomings that limit their use. These include: statistical nature of the excitation of AG-dependent random factors, excitation of AG mainly at speeds equal to or p is ebisawa synchronous, the need to have an external source of reactive power (usually a capacitor Bank)required to create reactive currents for magnetizing machine, as well as covering the needs of reactive power from the load when the latter is active-inductive character. The capacity of the capacitors in the circuit of AH-excitation must be large enough (approximately equal to the active power AG) [1]. Another disadvantage of the known constructions AG is their lack of reliability in terms of generator sets with extreme environmental conditions, e.g. high humidity (or just water) and temperature (above 120° (C)that are characteristic of the energy-generating units are Autonomous objects of low power, for example, micro hydro, benzoelektrosila and other

Also known asynchronous generator with excitation containing the rotor squirrel cage winding and located across the working gap of the stator in the form of a core with Z prongs placed in the slots of the stator winding, equipped with permanent magnets arranged in the magnetic circuit of the generator and the excitation capacitors described in [2] and adopted as a prototype. This AG, named by its authors as an asynchronous generator with a guaranteed samoposluge is the group (AGGS) [3], eliminates the statistical nature of the excitation characteristic of the conventional AG, and also provides guaranteed excitation at low speeds of rotation of the rotor and has a relatively less reactive power of capacitors compared with traditional designs AG. However, as with conventional induction generators [1], EGGS [2] also is not a high reliability when working with the above extreme environmental conditions. This is due to the presence of AG and EGGS wiring insulation of the stator winding, which is not designed to work in these conditions. Relatively high value of phase-to-phase voltage of the stator winding (line voltage 380 V), under which are the conductors of different phases, placed in a groove or in one place the frontal part winding, may also lead to the failure of AG and EGGS in these conditions. The increased isolation in machines operating in these conditions, or the adoption of other special measures leads to a significant reduction of the fill factor of the conductors of the slots of the stator and thus to a significant reduction in the specific power of these machines. This factor is in conflict with the requirement for reduction of weight and size and increase power density generators operating in stand-alone objects with extreme environmental conditions.

p> The task of the invention is to expand the scope and improve energy performance and reliability of induction generators operating in power plants Autonomous objects with extreme environmental conditions

The technical result, which is aimed invention is a safe operation AG in chemically aggressive, radiation and explosive gaseous and liquid environments at high pressures (up to 100 MPa) and temperature (up to 600° (C), as well as a significant increase in the specific power AG and, consequently, reducing weight and size characteristics of these machines running in standalone objects generating units.

The problem is solved due to the fact that in an asynchronous generator, as in EGGS [2], containing the rotor squirrel cage winding and located across the working gap of the stator in the form of a core with Z prongs placed in the slots of the stator winding and excitation capacitors, unlike the prototype, the stator winding is made in the form Z rods, closed with one hand short (SC), the ring oscillator includes an additional magnetic core with slots, which are placed in the insulated conductors of three-phase windings and electrically conductive rods connected to one of the parties is with Z terminals of the winding stator, on the other shorted the second short-circuit-ring, forming a Z-phase winding of the AG.

This additional magnetic core made of coaxially arranged cylindrical toothed cores adjacent teeth to each other, with the slots, some of which are electrically conductive rods, and other conductors of three-phase windings. The rotor of the asynchronous generator is equipped with permanent magnets, which are placed evenly on the rotor teeth are flush with its surface, forming a striped pole, and the number of the rotor teeth is divisible by the number of permanent magnets. The stator and the rotor of the asynchronous generator can be located inside a sealed object and separated from the secondary magnetic circuit hermetically sealed by a partition, and the terminals of the stator winding and the conductive terminals located in the secondary magnetic circuit, forming a Z-phase winding is electrically connected across the inputs, located in a sealed bulkhead. Finally, the excitation capacitors, and three-phase load connected to the phases of the three-phase winding placed in the secondary magnetic circuit.

Execution AG in accordance with the above basic characteristics expands the possible applications, but also improves energy performance and reliability of the claimed design through away the via conductor and slot insulation not only in the rotor, but in the stator AG.

Signs relating to that:

additional magnetic core made of coaxially arranged cylindrical toothed cores adjacent teeth to each other, with the slots, some of which are electrically conductive rods, and other conductors of three-phase windings;

- permanent magnets, which are placed evenly on the rotor teeth are flush with its surface, forming a striped pole, and the number of the rotor teeth is divisible by the number of permanent magnets;

in asynchronous generator rotor and stator may be located inside a sealed object and separated from the secondary magnetic circuit hermetically sealed by a partition, and the terminals of the stator winding and the conductive terminals located in the secondary magnetic circuit, forming a Z-phase winding is electrically connected across the inputs, located in a sealed septum;

- excitation capacitors included in phase three-phase winding placed in the additional magnetic develop common signs and are therefore private.

The invention is illustrated by drawings. 1 shows a longitudinal section of the asynchronous generator. Figure 2 presents the scheme of inclusion of AG. Figure 3 shows the design of an asynchronous generator with micro hydro.

the synchronous generator (figure 1) contains the actual generator part 1, which can be placed directly in an airtight object with extreme environmental conditions (figure 1 sealed himself the object is not shown), and an additional magnetic core 2 with windings placed in the normal environment. AH contains the stator 3, Z grooves which are terminals 4, closed at the end part on the side of the output shaft 5 AG short short-circuit-ring 6, forming a Z-phase core, the stator winding. The rotor 7 AG contains KS-winding 8 and the gear core 9, the teeth of which are located permanent magnets 10, for example, in the form of a parallelepiped. The permanent magnets 10 are placed evenly on the teeth of the core 9 is flush with the working surface of the rotor 7, forming a striped pole, and the number of the rotor teeth is divisible by the number of permanent magnets. Additional magnetic core 2 can be made of coaxially arranged cylindrical toothed cores 11 and 12, the adjacent teeth to each other, with Z grooves, some of which are respectively conductive rods 13, and the other conductors of three-phase winding 14. Conductive rods 13 in the front-end part closed KS-ring 15, and the other ends of the rods are electrically connected through the electrical feed-through plates 16 with terminals 4 of the stator winding, forming a Z-phase winding of the AG. The 16 inputs are uniformly distributed in the environment and the values and pass through a sealed bulkhead 17, separating the actual generator part 1 and additional magnetic core 2 with the windings.

From the diagram in figure 2 shows that the excitation capacitors 18 are connected in a star schema” to the three phase winding 14 additional magnetic core 2. The rotor AG is rotated by a drive motor 19. Three-phase load 20 receives power from three-phase winding 14 AT through a three-pole switch 21.

Figure 3 presents one of the variants of the structures proposed AG as part of the micro. From figure 3 it is clear that proper generator part 1, part AG, receives the rotation of the rotor from the working propeller turbine wheel 22 under the action of a stream of water passing through the inlet 23 and outlet 24 nozzles of the micro. In this case, the generator portion of the AG is located in the housing 25 of the micro, i.e. in the aquatic environment, and the additional magnetic core 2 with windings separated from AH sealed flange wall 17, is in a normal air environment.

The partition 17 may be part of a housing of the sealed object (figure 1) or may be part of a flange of the body of the generator parts AG, hermetically closing the hatch in the hull sealed object (figure 3).

AG operates as follows. During rotation of the rotor 7 AG from the drive motor permanent magnets 10, forming a striped pole number equal to the number of stator poles 3, avodat terminals 4 Z-phase stator winding of the Z-phase symmetrical system EDS. These EMF cause the flow Z-phase symmetrical currents that pass through connected to the terminals 4 of the stator winding of electrically conductive rods 13 that are located in the secondary magnetic circuit 2 and closed short ring 15. In additional magnetic core 2 is formed a circular rotating magnetic field with the same number of poles as the stator winding AG. This field induct in three-phase secondary winding 14 of the symmetric three-phase EMF and causes currents in the winding 14 and reactive currents of the capacitor 18 is connected to the secondary winding 14 (figure 2). Reactive currents of the capacitors serve as a source of additional reactive power, which, adding to the reactive power from the rotating magnetic field of permanent magnets, provides the excitation magnetic field in the AH. Thereby the excitation of AG and output active power three-phase load 20 connected to three-phase secondary winding 14.

The presence of permanent magnets 10 in the rotor declare AG, as in the prototype [2], provides the compensation part of the reactive power required for the excitation of AG and, consequently, reducing the required capacity of the capacitor excitation compared with conventional AG [1]. However, as usual AG and EGGS [2], has a conductor and a groove of the first insulation of the stator winding and, therefore, limited to use in these extreme environmental conditions, for which intended the proposed construction AG.

The above construction AG is essentially the aggregate of the two electric machines, which can be called generator-transformer unit (GTA) (a type of machine-transformer units, considered in [4])connected with their bare rod Z-phase windings 4 and 13 through electrical inputs 16. One electric machine (on the right side of the partition 17 in figure 1) is a proper generator part 1 GTA with squirrel-cage rotor 7, is equipped with permanent magnets 10 and the stator 3 with the above-mentioned Z-phase winding 4. The second electric machine GTA - additional magnetic core 2 with windings (on the left side of the partition 17 in figure 1) is essentially a transformer-inverter voltage and number of phases (FBL) with a rotating magnetic field. During rotation of the rotor and the excitation GTA in its generator part 1 the occurrence of a symmetric system Z-phase EMF in the stator winding 4, which are transmitted on the Z-phase core winding 13, which is the primary winding of the FBL. EDS primary Z-phase winding FBL has a sufficiently low value (of the order of several volts) is transformed into a symmetric EMF three-phase secondary winding of TNF to its nominal value (220 / 380V). Thus, in the FBL is transformed voltage (increase) and the number of phases (in the direction of decreasing Z until 3).

It should be noted that the considered design AG, as and EGGS [2] (in contrast to conventional AG [1]), at the expense of permanent magnets with alternating polarity on the rotating rotor forms an output voltage on the secondary winding FBL and generates the active power at any, even very low speed of rotation of the rotor. The frequency of voltage and current for excitation of the AG is set by the speed of rotation of the rotor, as is the case for synchronous generators. At the same time in the formation of the voltage and frequency of the AG involved parameters of the rotor-stator circuit AG and chain FBL: i.e. active-inductive parameters of the windings and the capacity of excitatory capacitors. Thus, the AG receives the combined excitation from permanent magnets and capacitors. To reduce the capacitance of the capacitors, the latter connected to three-phase secondary winding FBL. This ensures unconditional self AG in a wide range of speeds of rotation, i.e. completely eliminated the statistical nature of the excitation unlike conventional AG [1] - excitation. In this construction the relative excitation power can vary from a few percent is in power AG to the optimal value, the value of which is dependent on a number of structural factors, defined settlement experimentally and is a know-how of the invention.

In the proposed AG due to the nature of its design, based on the structures of the active parts of the traditional electric machines, ensures maximum commonality of parts and Assembly units, and the ability to link AG of removable and interchangeable machines and create cut series AG on the basis of commercially available induction motors series 4A, air, 5P, etc. This allows to reduce the complexity of manufacturing such AG up to level serial machines and to improve the maintainability of such units.

The proposed construction AG in the area of converting mechanical energy into electrical energy, i.e. in the actual generator part, no wiring

and slot insulation of the windings. This circumstance allows you to place the generator part of the AG in sites with extreme environmental conditions (high temperature, pressure, humidity, explosive atmosphere, ionizing radiation). In this case, the transformer part of the AG, i.e. FBL located in the normal environment, separated from the generator part sealed by a partition 17 with 16 inputs, connecting rod winding 4 of the stator 3 AG and the primary core winding 1 FBL.

Since the generator part 1 AG does not have the wire and slot insulation of the stator winding, and the winding is not sapnay and rod, it is possible to increase the fill factor of the slots of the stator provodnikovym material to 1 and thereby increase efficiency and significantly increase the power density of the power generating part located in the sealed object. The latter circumstance is often decisive in the construction of generating facilities operating in stand-alone objects with extreme environmental conditions.

The above design features AG can provide frequent need for accommodation in the area of interest with extreme parameters of moving media (combined-cycle, gas-plasma, thermal, and others), highly reliable generating devices with minimum dimensions and weight.

Thus, a new design of asynchronous generator improves reliability and extends the field of application of the generating units with the possibility of its use in the above fields.

Sources of information

1. Waldek A.I. of the Electric machine. L.: Energy, 1974.

2. Aliyev I.I., Bespalov VA, Klokov SHE Asynchronous generator. Evidence of the Russian Federation for useful model No. 1742. // Publ. 16.07.96. Bull. No. 7.

3. Aliyev I.I. Bespalov VA, Klokov Yu is. Asynchronous generator with a guaranteed excitation) / / Elektrichestvo. 1997. No. 7.

4. Sveceny D.V., Fence I.G. Machine-transformer Assembly // Electrical engineering. 1998, No. 9.

1. Asynchronous generator containing a rotor with a squirrel-cage winding and located across the working gap of the stator in the form of a core with Z teeth, placed in the slots of the stator winding, and a capacitor excitation, characterized in that the stator winding is made in the form Z rods, closed with one hand short ring oscillator includes an additional magnetic core with slots, which are placed in the insulated conductors of three-phase windings and electrically conductive rods connected to one side with Z terminals of the stator winding, and the other closed by the second ring, forming a Z-phase winding.

2. Asynchronous generator according to claim 1, characterized in that the additional magnetic core made of coaxially arranged cylindrical toothed cores adjacent teeth to each other, with the slots, some of which are electrically conductive rods, and other conductors of three-phase windings.

3. Asynchronous generator according to claim 1 or 2, characterized in that the rotor is equipped with permanent magnets, which are placed evenly on the rotor teeth are flush with its surface, forming alternating the I pole, moreover, the number of teeth of the rotor is a multiple of the number of permanent magnets.

4. Asynchronous generator according to any one of claims 1 to 3, characterized in that the rotor and the stator is separated from the secondary magnetic circuit hermetically sealed by a partition, and the terminals of the stator winding and the conductive terminals located in the secondary magnetic circuit, forming a Z-phase winding is electrically connected across the inputs, located in a sealed bulkhead.

5. Generator according to any one of claims 1 to 4, characterized in that the excitation capacitors included in phase three phase winding.



 

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Induction generator // 2255409

FIELD: electrical engineering; specific electrical machines for off-line power supplies.

SUBSTANCE: proposed self-excited induction generator designed for operation under abnormal environmental conditions and in hermetically sealed power-generating units has squirrel-cage rotor and core-shaped stator with Z teeth whose slots receive stator winding, as well as field capacitors; novelty is that stator winding is made in the form of Z bars closed on one end by means of end ring. Generator also has additional magnetic core with slots receiving three-phase winding and conducting bars connected on one end with Z bars of stator winding and on other end they are closed by means of other end ring to form Z-phase winding.

EFFECT: enhanced reliability, reduced mass and size of induction generator.

5 cl, 3 dwg

FIELD: electricity.

SUBSTANCE: invention relates to cascade electric rotary actuator drives and may be used for production of gearless drives with frequency adjusted from 0 to double nominal at stable nominal rotation speed including reversible and other type drives. The proposed controllable cascade electric drive contains two electric motors mounted coaxially on the housing. Each motor is composed of a rotor rigidly mounted on its shaft and a stator. The stator of one of the electric motors is designed as stationary and is mounted on the housing while the second motor stator is capable of free motion relative of the shaft. According to the invention concept, it additionally contains a fixture ring rigidly mounted on the shaft of the stationary stator motor. Mounted on the fixture ring are two e-magnetic clutches one of them capable of contact with the friction plate that has a projection fitting into the movable stator body concavity which is coaxial to the said projection. The other e-magnetic clutch is capable of contact with its friction plate and of connection, with the help of the said plate, to the movable stator electric motor shaft that has a splined recess for the friction plate to fit in. The working areas of the above two friction plates that come in contact with the above e-magnetic clutches are equal to provide for identical performance of the said e-magnetic clutches. Mounted on the drive housing is a third e-magnetic clutch capable of contact with a third friction plate that has a projection fitting into the movable stator body having a concavity which is coaxial to the said projection of the third friction plate.

EFFECT: extension of the range of the cascade electric drive adjustment due to provision for generation of high rotation speeds close to double the nominal one at constant torque value or possibility to generate a doubled torque value at constant rotation speed.

2 cl, 6 dwg

FIELD: electricity.

SUBSTANCE: invention relates to the field of electric engineering, in particular, to AC electric drives, and may be used as electromechanical converter for mechanisms, having elastic connection to fixed support. In doubled induction motor, including two rotors with short-circuited windings, fixed stator and movable stator, according to invention, rotors are arranged on different shafts, movable stator is rigidly connected to rotor related to fixed stator, and each of stators is connected to network via individual frequency converter, including metering system and speed controller.

EFFECT: prevention of oscillating loads, and also reduction of electromagnet and mechanical losses at start and in the mode of load overcoming.

1 dwg

FIELD: electricity.

SUBSTANCE: invention refers to cascade electric actuators of rotational movement, which consist at least of two asynchronous motors of the same type, and can be used at creation of electric actuators with controlled rotation speed from nominal to double nominal at constant moment, or actuators with double moment at constant nominal rotation speed, as well as at creation of other types of electric actuators. Controlled cascade electric actuator includes two electric motors coaxially installed in housing, each of which consists of rotor and stator; besides, stator of the first electric motor is fixed on housing, and its rotor is fixed on its shaft; fastening rings two of which are fixed on the housing, and the other one is fixed on shaft of the first electric motor, electromagnetic clutches fixed on the housing of electric actuator, three-phase power supply system; rotor of the second electric motor is movable and installed so that it can be freely rotated relative to its shaft, and stator of the second electric motor is fixed on its shaft. Fastening ring rigidly fixed on housing of controlled cascade electric actuator on which there installed are three fixed friction semi-clutches one of which has the possibility of being pulled in order to fix the friction gasket (installed on the first shaft) of its movable semi-clutch sliding along splined recesses of electric motor shaft with freely rotating rotor; the other semi-clutch has the possibility of being pulled in order to fix to the same friction gasket of its semi-clutch entering the cavity of housing of movable rotor, which is coaxial to the above semi-clutch, and the third semi-clutch has the possibility of being pulled in order to fix to the other friction gasket fixed on the electric actuator housing of its semi-clutch entering the cavity of movable rotor housing, which is coaxial to the above semi-clutch.

EFFECT: improved design of cascade electric actuator due to operation improvement of system of electromagnetic clutches and power supply system of one of asynchronous motors, which provides obtaining of high rotation speeds close to double nominal, at nominal value of moment or obtaining of double moment at nominal rotation speed.

3 cl, 1 dwg

FIELD: electricity.

SUBSTANCE: axial cascade electric drive comprises two coaxially connected electric motors, besides, magnetic systems of two electric motors are made axial and are arranged in one body and on a common shaft, which is horizontally fixed in bearing units of the body, besides, by one side the stator of one electric motor is rigidly connected to the body, and on its other side between the three-phase winding and the shaft hole there are coils of controlled couplings, which are located oppositely to two rings of large and small diameters from a non-magnetic material, a rotor arranged on the bearing, at the other side of which there are ring-shaped slots, the free space of which is filled with a ferromagnetic powder. At the same time, according to the invention, the rotor of the other electric motor is arranged on the bearing and has a ledge in the form of a wide thin ring from the same material as the rotor itself, and enters the slot of the large diameter of the rotor of the other electric motor, providing when connected to the network of one coil of the controlled coupling rigid connection of the rotor of one electric motor with the rotor of the other electric motor, the stator of which is rigidly connected with the shaft, besides, between the rotor of one and rotor of the other electric motor there is a metal part arranged rigidly in the form of a hollow sleeve, with the ledge entering the slot of small diameter of the rotor of one of electric motors, providing when supplying voltage of the supply network to the other coil of the controlled coupling the rigid connection of the rotor of one of electric motors with the common shaft, which is the output one, and on the rotor of the other electric motor there is a ledge of magnetic material, which enters the body of the ferropowder coupling fixed on the body of the electric drive, besides, additionally comprising a current pickup device, the fixed part of which is rigidly fixed on the body of the electric drive, and the movable part is installed on the shaft and supplies electric energy for the widing of the stator rigidly connected to the shaft.

EFFECT: invention provides for getting high speeds of rotation, close to a double rated one at rated value of the torque value, or getting a double torque at rated speed of rotation for a different range of capacities of an electric drive with simultaneous increase of such drive operation reliability.

2 cl, 1 dwg

FIELD: electrical engineering.

SUBSTANCE: transformer part of the unit has the primary winding connected to three-phase network and the secondary winding connected to z-phase bar winding placed inside z groves of the transformer magnet core at one side closed by the short-circuited ring and at the other side connected to Z bars of the stator winding. Propulsion part of the unit contains asynchronous engine with disc squirrel-cage rotor located between two disc stators with bar windings electrically connected to the secondary bar winding of the transformer and from the other side by closed short-circuited rings. Bars of the secondary transformer winding are connected to Z bars of stator windings by bars used as sealed leads-in and located in a sealed bulkhead.

EFFECT: improvement of energy response and reliability of propulsion-transformer unit with simultaneous extension of its application area.

4 cl, 4 dwg

FIELD: electricity.

SUBSTANCE: in electrical machine the second armature winding is made combined and located in stator slots of the main magnet core; it is equipped with capacitor bank. Second inductor winding is also combines, multi-phase, short-circuited; it is located in stator slots of the main magnet core. The first winding of rotor is connected to toroidal windings of auxiliary magnet core of the rotor; the first winding of stator is connected to output of frequency converter which converts electric energy of current frequency of the second armature winding to required value of control frequency and delivers it to stator winding of the main magnet core in order to create excitation current and rotating electromagnetic field with this control frequency. Control frequency is set at the output so that frequency of output current is permanent notwithstanding frequency of drive rotation.

EFFECT: reducing weight and overall dimensions and improving cooling and ventilation systems.

2 dwg

FIELD: electricity.

SUBSTANCE: transformer part of a unit is made with a primary winding connected to a three-phase circuit, and with a secondary z-phase bar winding, arranged in z slots of a transformer magnetic conductor closed at one side with an end ring. The drive part of the unit comprises an induction motor with a short-circuited rotor and stator with a bar winding, electrically connected with the secondary winding of the transformer, and at the other side closed with the end ring. The bars of the secondary winding of the transformer are connected with Z bars-feedthrough plates arranged in a tight partition. Each bar-feedthrough plate at the other side is electrically connected with n bars of the stator winding via intermediate electric wire arched segments adjoining the stator (where n=1, 2, … - multiple number between the bars of the stator winding and the secondary winding of the transformer).

EFFECT: expanded area of application and increased energy characteristics and reliability of a drive-transformer unit.

2 dwg

FIELD: electricity.

SUBSTANCE: asynchronous drive with cascade and common rotor comprises two electric motors connected coaxially, which magnet systems are axial and placed in the same housing at the same shaft fixed horizontally in bearing assemblies of the housing. Stator of the first electric motor is fixed rigidly by its one side to the housing. Rotor of both motors are joined in a single structure comprising joined magnet core with radial slots placed at the left and right side of the rotor, wherein squirrel-cage winding placed with its turns passing from the left lock ring placed at inner left side of the joined rotor, then through the left slot, then through outer side of the rotor and finally through the right slot to the right lock ring placed at the right inner side of the joined rotor. Stator of the second electric motor is fixed rigidly and by its teeth is faced towards stator teeth of the first electric motor. Stator winding of the second electric motor is connected to variable resistors controlling change in rotation velocity and moment of the controlled electric drive with cascade.

EFFECT: reliability improvement.

1 dwg

Induction generator // 2255409

FIELD: electrical engineering; specific electrical machines for off-line power supplies.

SUBSTANCE: proposed self-excited induction generator designed for operation under abnormal environmental conditions and in hermetically sealed power-generating units has squirrel-cage rotor and core-shaped stator with Z teeth whose slots receive stator winding, as well as field capacitors; novelty is that stator winding is made in the form of Z bars closed on one end by means of end ring. Generator also has additional magnetic core with slots receiving three-phase winding and conducting bars connected on one end with Z bars of stator winding and on other end they are closed by means of other end ring to form Z-phase winding.

EFFECT: enhanced reliability, reduced mass and size of induction generator.

5 cl, 3 dwg

FIELD: electrical and electromechanical engineering; various induction machines running as generators.

SUBSTANCE: proposed device for exciting induction generator 1 has group of capacitors 2 connected to phases A, B, C of stator armature winding, as well as group of additional capacitors 3 connected to respective phases A, B, C of stator armature winding through rectifier 4, and unit for regulating output phase voltage of stator armature winding incorporating output voltage sensor 5, threshold voltage unit 6, electronic data conversion and processing unit, and switching unit incorporating control switching members 7. Mentioned electronic data conversion and processing unit has standard clock-pulse generator 8, clock-pulse counter 9, and dc amplifier 10.

EFFECT: reduced setting error of generator output voltage within wide usable load range, enhanced operating reliability of device.

5 cl, 3 dwg

FIELD: electricity.

SUBSTANCE: in an autonomous induction generator a quadripole stator winding is made of 12 coil groups (1-12) and excitation capacitors. The winding of the asynchronous generator in each phase is formed from coil groups (1, 3, 5, 7, 9, 11) in the form of the first dual-beam "star" with outputs (13, 14, 15, 19), to which the excitation capacitors are attached, and the second dual-beam "star" with outputs (13, 16, 17, 18), which are formed by connection of coil groups (2, 4, 6, 8, 10, 12). The output (13) is taken from combined ends (1, 3, 5, 7, 9, 11), connected with starts (2, 4, 6, 8, 10, 12) of coil groups; the output 14 - from combined starts (1,7) of coil groups; the output (15) - from combined starts (3, 9) of coil groups; the output (16) - from combined ends (4,10) of coil groups; the output (17) - from combined ends (6, 12) of coil groups; the output (18) - from combined ends (2, 8) of coil groups; the output (19) - from combined starts (5, 11) of coil groups. Additionally outputs (14, 15, 19) at one side and outputs (16, 17, 18) at the other side are connected to each other by pairs of serially connected compensation capacitors, and general points of connection of these capacitors have outputs for connection of the load to the induction generator.

EFFECT: higher energy efficiency of an induction generator.

6 dwg

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