Single-phase transformer with rotating magnetic field

FIELD: electrical engineering.

SUBSTANCE: invention pertains to electrical engineering and can be used as an input organ for protective and automation devices for power supply systems. The single-phase transformer has four primary coils on a toroidal core, ballast resistors and an inductor, multi-phase secondary coils. The beginning of the first coil is joined to the end of the second coil, forming the first input of the device. The end of the first coil is joined to the end of the third coil, the end of the second coil to the end of the fourth coil. The end of the third coil is joined to the ballast inductor, and the beginning of the fourth coil is joined to the ballast resistor, the other ends of which form the second input of the device when joined. To obtain a rotating magnetic field, the first, second, third and fourth coils are on the toroidal magnetic core with shift of 90 degrees from each other. The number of turns in the first and fourth coils is more than twice the second and third coils.

EFFECT: elimination of phase shifting elements when converting single-phase voltage into multi-phase voltage.

1 dwg

The invention relates to measuring and converting technology, but rather to transformers with a rotating magnetic field, and can be used as an input body protection devices and automation of electrical systems.

Known single-phase instrument transformer (for example, type ASM, mass-produced by the Talema Group, India, product catalog, page 2), in which the primary winding is the wire with the measured current, the secondary winding voltage is wound on a ferromagnetic toroidal core, and a short-circuited winding is designed for extending the range of measurement.

This transformer is close to the proposed transformer according to its purpose, but differ in design.

Also known multiphase transformer with a rotating magnetic field (patent No. 2187163, 01F 30/14)containing twisted magnetic core, the slots of which there are three-phase primary and a polyphase secondary winding, and two side magnetic core adjacent to the ends of the secondary magnetic circuit through the magnetic strip, characterized in that the magnetic circuit is made of toroidal shape, the grooves are made on the ends of the secondary magnetic circuit, and in the same grooves laid his primary winding is performed by a distributed two-shortened W is d, and a secondary winding, a single layer made diametrically, both windings are made of bipolar and laid in grooves in three layers.

This transformer is close to the claimed transformer by the greatest number of structural characteristics, but cannot be used as an input body protection devices and automation of electrical systems.

The technical result of the invention to provide a multi-phase system of voltages of the single-phase supply voltage without the use of phase-shifting elements.

This technical result is achieved by the fact that single-phase transformer with a rotating magnetic field contains four primary winding located on the toroidal core, ballast resistor and inductance, polyphase secondary winding and the first winding is connected to the end of the second winding forming a first input device, the end of the first winding with the end of the third winding, the end of the second winding with the end of the fourth winding, the end of the third winding with ballistol inductance, and the beginning of the fourth coil with ballast resistor, the other ends of which form when connecting the second input device, and to obtain a rotating magnetic field the first, second, third and fourth windings are located relative to each other on a torus is idalina magnetic core with a shift of 90 degrees, the number of turns of the first and fourth windings more twice than the second and third.

Designed transformer is implemented as follows: terminals 1 and 2 of the transformer connected to the power source. Next, the terminal 1 is connected to the beginning of the coil 3 and the end 4 of the first winding, in turn, the end of the coil 3 and the 4 are connected with the beginning of the 5 and the end 6 of the second winding, and the number of turns of the first of these two times more than in the second. Thus, the magnetomotive forces of the two coils of each winding vzaimovyigrysha. In series with the coils included ballast inductance 8 (first branch) and the resistance 7 (second branch) to provide the required angle of the phase shift between the currents in both branches of the circuit. The secondary winding can be performed for any number of phases, with their location in the respective grooves of the magnetic system.

The novelty of the claimed technical solution is that the rotating magnetic field is obtained without the use of multi-phase input voltage and the phase-shifting capacitor.

According to scientific-technical and patent literature not known to the authors declare the set of features aimed at achieving the stated technical result, and this decision does not follow clearly from the prior art that allows yet to make a conclusion on compliance decisions inventive step.

Receiving a rotating magnetic field is possible only when equal and perpendicular vectors magnetomotive forces of the windings. This condition is observed when a certain ratio of the currents in the branches of the system. The above described property is executed in the following case:

whereand- magnetomotive force perpendicular windings.

Since the number of turns in the coils of each winding is as 1 to 2 and they included a counter, you can write the following equality for the relative magnetomotive forces of the windings:

whereandthe relative currents in the two branches of the schema

and- relative magnetomotive force of the winding.

Substituting expression (2) in the equality (1), we obtain the equation that determines the currents in the two branches of the schema:

Accounting equation on the first Kirchhoff's law for one of the nodes in the schema, we get the following system of equations:

where- the total current of the transformer.

Solving recorded equations together, we get the following expressions for the currents wet the nd:

Where the phase shift between the currents is equal to:

From the above expressions it is seen that the obtained value of the angle does not depend on any parameters of the scheme, in addition to the ratio of the numbers of turns of the primary winding of the transformer. To ensure this phase shift is only necessary to choose the appropriate values of the ballast resistor (7) and inductance (8)ensuring the equality of the currents in the branches.

Figure 1 shows the circuit diagram of single-phase transformer with a rotating magnetic field. Figure 2 shows explaining the operation principle of the vector diagram. The clamps 1 and 2 - single phase input device. The transformer contains two groups of primary counter is enabled windings (3, 4, and 5, 6)having a spatial shift of 90°and a ballast resistor 7 and the orifice 8. In the grooves of the toroidal core 9 laid polyphase secondary winding 10-16. Vector chart contains the relative values of the currents in both branches,and also created by these currents magnetomotive forces of both groups of primary windingsand.

Works claimed transformer with a rotating magnetic field after the ith follows: the clamp 1 and 2 is fed single-phase AC voltage with frequency of 50 Hz. The primary winding (3-6) by means of a counter included sections creates a system of two perpendicular and equal modulo magnetomotive forces (andin the magnetic system 9. Described magnetomotive force, in turn, creates a rotating magnetic field which induces in the secondary windings (10-16), shifted the spatial angle of 60°, electromotive force, also has a phase shift of 60°and, as a result, output devices (clamps 10-16) the resulting system voltage number of phases equal to 6.

The use of rotating magnetic fields and polyphase rectification in the measuring transformer is dramatically reduced run-out output voltage, and also extends the functionality of the device.

Single-phase transformer with a rotating magnetic field, characterized in that it contains four of the primary winding located on the toroidal core, ballast resistor and inductance, polyphase secondary winding and the first winding is connected to the end of the second winding forming a first input device, the end of the first winding with the end of the third winding, the second winding end of the fourth winding, the end of the third winding with ballistol inductance, and the fourth about ODI - with the ballast resistor, the other ends of which form when connecting the second input device, and to obtain a rotating magnetic field of the first, second and third and fourth windings are located relative to each other on a toroidal magnetic core with a shift of 90°while the number of coils of the first and fourth windings more twice than the second and third.

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