Controlled two-dimensional electric machine

FIELD: electricity.

SUBSTANCE: rotor winding is performed as rotor windings of asynchronous machines with phase rotor in the circuit of which three-phase full-wave regulating thyristor rectifier unit is included. At that, output of this rectifier unit is connected in series with armature circuit using keys of switch unit that is able to perform either serial-additive or serial-subtractive connection with armature circuit depending on sign of armature rotation frequency change direction.

EFFECT: providing control for output rotation speed of two-dimensional electric machine and for frequency of generated by it voltage when input signals are continuously and indeterminantly varying.

2 dwg

 

The invention relates to electrical engineering and can be used as an Electromechanical transducer mechanical energy supplied to one (mechanical) input machine, and electric power of direct current, at the same time supplied to the other input (electrical), total electrical energy of alternating current.

Known rotary DC amplifier (Kopylov I.P. Electric machine. - M.: Energoatomizdat, 1986, s-333), which increased electric power of direct current due to the applied mechanical energy.

However, this machine, being on the principle of steering electric power DC due to mechanical energy, cannot operate as an alternator, which converts two dissimilar source of energy, because of its purpose, because it is essentially an Electromechanical energy Converter DC.

A prototype of this invention is the input electrical machine (Patent RF №2091967). Input electrical machine consists of laminated armature cores and the brush-commutator machine DC machine, placed concentrically in the annular laminated magnetic circuit of the rotor winding type rotor windings of induction is asin (for example, squirrel cage or wound rotor), shrunk into the body, with the possibility of rotation around the laminated armature. In the slots of the armature also laid optional three-phase winding of alternating current connected with a network of consumers of electricity through brushes and slip rings.

However, such machines are impossible to regulate the output speed of rotation of the armature, which sharply limits the scope of application this machine. For example, in wind power when the wind wheel rotates the rotor speed ωpdue to continuous changes in the speed and force of the wind speed varies continuously, i.e. ωp=var speed ωandalso continuously changing complex law, therefore, will also change the frequency of the output voltage.

As ωa=f(ωp)=var, then the machine does not have control (stabilization of the rotation speed), it is often necessary in practice.

This invention solves the problem of control output speed two-dimensional electrical machine, and hence the frequency of the generated voltage when it is continuous and non-deterministic changing input signals.

This is achieved in that the rotor winding is made by type rotor windings of asynchronous machines with asnam rotor, in a circuit which included a three-phase full-wave adjustment thyristor unit-rectifier, the output of which is connected in series with the circuit of the armature by means of the keys of the switching unit, having the ability to implement or sequentially-agree or sequentially-counter enable with chain anchors depending on the sign of the direction of change of frequency of rotation of the armature.

1 shows a General view (in section), we offer a managed two-dimensional electrical machine. Figure 2 presents the electrical circuit of this machine.

Managed a two-dimensional electrical machine includes anchor 1 DC machine conventional design with coil 2 placed in the grooves 3, the collector 4 with brushes 5, to which is connected the wires 6. Also in the grooves 3 are additionally stacked three-phase generator winding AC 21, the output of which 23 by means of three contact rings 22 and three brushes 24 is connected with a network of consumers AC. Brush 24 by wire 25 connects the coil AC 21 with a network of consumers alternating current to transfer the generated electricity to consumers. In case 7 plated laminated magnetic core of the rotor 8, the grooves of which are stacked winding 9 by type rotor windings of induction motors with wound rotor. The winding 9 is connected by wires 10 the rings 11, isolated from the body of the dielectric strips 12 and brushes 13 are connected with three-phase full-wave adjustment thyristor unit rectifier 19 wires 14. Shields 15 with bearings 16, 17 and the shaft 18 to provide a concentric location of the anchor 1 and the rotor 8 and the possibility of their simultaneous rotation. Three-phase full-wave adjustment thyristor unit-rectifier 19 is connected with the switching unit 20.

Managed a two-dimensional electrical machine operates as follows. When applying a constant current (e.g., photovoltaic cells) to terminals 6 through the brush 5 and the collector 4 of the coil 2 anchor 1 is flown shock. This creates a magnetic flux of the reaction anchor fand. If the shaft 18 together with the rotor 8 and the coil 9 will come into rotation under the action of some externally applied moment (e.g. wind turbines), then under the action of the magnetic flux fandin the winding 9, as in an ordinary winding of an induction motor, induced EMF and electric current flows, creating in its own magnetic field rotor fp. When the interaction between flows of fandand fpanchor the machine will come up in the rotation frequency nand.

At the same time, the total magnetic flux of the machine induces three-phase armature winding 21 variable three-phase EMF, which snimals the contact rings 22 and brushes 24 and through wires 25 may be passed on to consumers three-phase alternating current.

The frequency of the generated three-phase alternating current will be proportional to the angular velocity of rotation of the armature ωand.

As the anchor of a two-dimensional machine made according to the type of anchor DC machine and operates in a stationary magnetic field generated by the rotor, the rotational speed of the armature with the electric machine at a constant rotational speed of the rotor will be determined the same dependence as that of the DC machine.

The frequency of rotation of the armature DC machine is determined by the relationship:

where Uathe voltage applied to the anchor; Rathe resistance of the armature winding; Iand- the armature current; fδ- the magnetic flux of the machine; ceconstant.

To control the output speed ωandwhen ever-changing the input speed ωpcan changing the voltage supplied to the armature of the machine.

From (1) we see that the change of the voltage Ualeads to a corresponding change in the frequency of rotation of the armature, i.e. when the voltage Uaspeed increases and, conversely, at lower falls.

Therefore, to control the output frequency of rotation of a two-dimensional electrical machine with all sorts of variations of input is necessary to change the voltage level of the input two the agreement of the electric machine.

To this end, the output winding 9 of the rotor 8 (see figures 1 and 2) by means of connecting wires 10 and 14, three contact rings 11 and three brushes 13 is enabled on the input three-phase full-wave adjustment thyristor unit-rectifier 19. Regulation of three-phase full-wave adjustment thyristor unit-rectifier 19 can be automated as a function of speed or any other parameter (for example, remove voltage from the Tacho-generator). The rectified voltage with three-phase full-wave adjustment thyristor unit-rectifier 19 is included in the circuit of the armature in series with the power source (for example, fotoelektricheskie Converter). Regulation of three-phase full-wave adjustment thyristor unit-rectifier 19 is made so that the incremental change EMF will track the change of rotation speed of the rotor. Depending on the sign of disturbance, i.e. the direction of change of frequency of rotation of the armature, a three-phase full-wave adjustment thyristor unit-rectifier 19 is switched on or sequentially in accordance with the chain of the anchor, to increase nRthe inclusion of the keys 2'-4' of the switching unit 20, or to reduce np- consistently-counter, turning on the keys 1'-3' of the block 20. If the need for regulation and the machine disappears, then the three-phase full-wave adjustment thyristor unit-rectifier 19 is turned off from the circuit of the keys 2'-3' of the switching unit 20. If you want to automatically stabilize the frequency of rotation of the armature of the machine nandcontrol of three-phase full-wave adjustment thyristor unit rectifier can be implemented specially designed automatic control system, implemented using known standard solutions, which in this application is not treated as unrelated to the merits of the invention.

The authors have constructed and tested two prototype managed a two-dimensional electrical machine, which fully confirmed the performance and prospects of this design. Tests showed that the error control does not exceed ±3% (with a range of change of the input speed ωp1:5), which dramatically expands the scope of a managed two-dimensional electrical machine, having in mind its use in alternative energy, requiring stabilization of the frequency of the generated voltage with a continuous and profound changes of disturbing influences.

Managed a two-dimensional electrical machine containing the armature winding and brush-collector machine DC machine, placed the oxygen is rejeski in the annular laminated magnetic core of the rotor, shrunk in the housing and capable of rotation around a laminated armature, characterized in that the rotor winding is made by type rotor windings of asynchronous machines with wound rotor, in a circuit which included a three-phase full-wave adjustment thyristor unit-rectifier, the output of which is connected in series with the circuit of the armature by means of the keys of the switching unit, having the ability to implement or sequentially-agree or sequentially-counter enable with chain anchor.



 

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