SU714590A1 - Ferromagnetic frequency converter - Google Patents

Description

The invention relates to ferromagnetic frequency converters and can be used, for example, to power a variety of consumers whose power frequency differs from the frequency of an industrial network by an integer or fractional number of times — electric motors, induction heating devices, welding, EDM, fluorescent lamps and etc. w

Known ferromagnetic frequency converters (multipliers and frequency dividers, both integer and fractional, number of times) are a kind of transformer devices with capacitors, the frequency conversion in which occurs due to the phenomena that occur when their ferromagnetic cores are saturated [1}.

. A disadvantage of the known ferromagnetic frequency converter is a low input natural power factor and a large installed capacity of capacitors for capacitance compensation in the output and intermediate circuits, which means a large weight and dimensions of the device (in comparison, for example, with a conventional transformer of equal input power and the same load).

The closest in technical essence is a ferromagnetic frequency quench with a three-phase input and a single-phase output And. The frequency converter is assembled from the sin of armored or rod single-phase transformers. The primary three-phase circuit of the carbon generator consists of sin windings connected by a star and placed on saturated cores. The secondary circuit is formed by connecting the secondary windings in series. The input power factor of the triple is small due to the large consumption of magnetizing current from the network. Therefore, with sufficient triple output power, it is necessary to use cosine capacitors in the primary circuit, the reactive power of which usually exceeds the load power by a factor of 2–3.

^r ....._. s 2

The disadvantage of the frequency converter ⁴ is great ustanovpen- Nye power capacitors kompensapii nesinusoidapnaya tanks and form the output voltage. The aim of the invention is to reduce the installed capacity of the capacitors and improve the shape of the output voltage curve. This goal is achieved by the fact that in a ferromagnetic frequency converter containing transformers with ferromagnetic cores carrying the primary and secondary windings with the terminals forming the -phase input, the p-fa output and the intermediate-phase phase circuit, ^g capacitor compensation capacitors, transformer windings are made of _dV at _{x of} galvanically unconnected flax foil, separated by a dielectric, and each terminal of the winding is connected to only one tape.

In FIG. 1 shows a single-coil winding of a transformer Element of a frequency converter: in FIG. 2 - diagram of the inclusion of the secondary winding; in FIG. 3 diagram of the inclusion of the primary winding; in FIG. 4 is an embodiment of an electrical circuit n ^ of a frequency former.

A ferromagnetic frequency converter contains one or multiple coils. winding of the transformer element, consisting of two strips 1 and 2 of aluminum or copper foil, separated by a thin insulating film 3 with high dielectric constant. Foil strips 1 and 2; the forming coils of the secondary winding are not galvanically connected. Similarly, the made coils of the primary winding have a galvanic connection of foil strips 40. The effect of the distributed capacitance of the turns of the windings 4 and 5 'is equivalent to turning on "* 0 in series or in parallel with the winding of compensating capacitors 6, 7 and 4 $

In FIG. 4 shows a diagram _{# of a} Ferromagnetic frequency converter with a three-phase input and a single-phase output c. . the use of foil windings. The device consists of three identical transformers of transformers with saturable cores, each of which contains foil windings. The equivalent capacity of the primary windings forms a star, while the capacity of the secondary windings turns out to be ₅₅ connected in series in the output circuit. '·; .......... ': .........

The device operates as follows.

When the three-phase input of the converter is connected to the network due to the saturation of the transformer cores at the terminals of the output circuit, consisting of a series connection of the secondary windings, the EMF of triple frequency and higher harmonics acts. The EMF of the fundamental frequency is excluded from the output voltage due to the input phase shift by 10 120. The voltage applied between the strips of the foil of the primary winding at any point is equal to half the voltage,. applied to the entire winding, so the entire volume of the foil winding is uniform.

but used as a dielectric combined capacitor. The capacitance of this capacitor is determined by the geometric 'dimensions of the winding and the type of dielectric.

When connecting the secondary windings of the transformers into an open triangle, their equivalent capacitance performs sequential capacitive compensation, which reduces the installed capacity of the capacitors in the circuit. Since the foil winding of the converter simultaneously represents a capacitive load for the main and all higher harmonics, this allows the introduction of capacitive compensation for each individual harmonic, improving the shape of the output voltage curve. The value of the equivalent capacitance of the output winding of the converter is selected so as to provide a resonant mode in harmonic output frequency.

Claims (2)

The invention relates to ferromagnet frequency converters and can be used, for example, to power a variety of consumers whose frequency differs from the frequency of the industrial network by a fine or fractional number of times — electric motors, induction heating, welding, electro-erosion processing, fluorescent lamps. etc. Known ferromagnetic frequency converters (multipliers and frequency dividers, both integer and fractional times) are peculiar transformer devices with capacitors, often converting: in which there is a thank you; Appearing at saturation of their ferromagnetic cores 1. . A disadvantage of the known ferromagnetic frequency converter is a LOW natural input power factor and a large installed powerful capacitor of capacitive compensation in the output and intermediate circuits, 13 means a lot of weight and dimensions of the device (compared to, for example, a conventional transformer of equal output power and the same : load). The closest in technical essence is ferromagnetic frequency triples with a three-phase input and a single-phase output 21. The clock converter is assembled from three armored or rod single-phase transformers. The first three-phase circuit of the triplexer consists of three windings connected by a star and placed on saturated hearts. The secondary circuit is formed by connecting the secondary windings in series. The input power factor of the triple is small due to high consumption from the magnetizing current network. Therefore, with sufficient output power, it is necessary to use cosine capacitors in the primary circuit, the reactive power of which usually exceeds 2-3 times the load power. ..; 7i The disadvantage of the known frequency converter is the large installed power of the capacitors of the Chompensash and the non-sinusoidal form of the output voltage. The aim of the invention is to reduce the installed power supply and improve f6p1sly output voltage curve. It is stable nejii; This is achieved by the fact that in a ferromagnetic frequency converter containing transformers with ferromagnetic cores that carry the main and main windings with leads that form the HVD, the PDS and the KfZvnogo circuit of the pus frequency, the capacitors of the capacitive comp, the windings, and the systems are connected to the main components; These are separated by a dielectric, and each output is connected to only one tape. On . 1 shows a single-coil winding transformer of the neWetiffaTip © Fracture frequency: FIG. 2 - scheme В1Ш10Чёш tcheraytaY winding; on (pg. 3 primary switching circuit; fig. 4 - an embodiment of the electric scheme for the formation of the frequency Ferromag1tnytreformtowotTotbi contains one - or multi-coil transformer element consisting of two bands 1 and 2 aluminum - &) LIPS 1 or GF or M ed folBgi, separated by a thin insulating film 3c high dielectric constant. Foil strips 1 and 2 forming BTOjMCHHoft carcasses: windings, galvanically not St. savbi. The coils of the primary winding are made similarly; they have galvanic coupling of foil strips. The effect of the distributed capacitance of the turns of the winding 4 and 5 “SHYYY1 yyssH $ SCHEDGED SCHEDULE or in parallel with the winding of compensating connectors 67 7 and g --Na 4zhg. 4 is a diagram d) epppMarNitnogo transducer cha (rt6ty three phase inputs 1 and odnrfazn1M yield using foil windings. UstroytftBb sbstoit of gr1ys yyyShSh Yth trpys shaper with nasyschayuschimis cores, each of which comprises a pho first obmo psi goEkvivalentna container. Wine windings forms a star, whereas haK the capacity of the secondary windings turns out to be connected to the last; yodo & 1 body in pepi,,,. - ..., ..., .. The device works as follows. o When the three-phase converter input is connected to the sergee due to saturation The transformer cores at the terminals of the output circuit, consisting of a series connection of secondary windings, have triple frequency emf and higher harmonics. The primary voltage emf is excluded from the output voltage of the input phase shift 120. The voltage applied between the strip Kffl of the primary winding is in any tome equal to half the voltage, applied to the entire winding, therefore the whole volume of the foil winding is uniform-. but is used as a dielectric capacitor. The capacitance value of this capacitor is determined by the geometrical dimensions of the winding and the type of dielectric. When connecting the secondary windings of transformers to open circuits, their equivalent capacitance performs a successive capacitive compensation, which allows reducing the installed capacity of capacitors in the circuit. Since the foil winding of the converter simultaneously represents a capacitive load for the main and all higher harmonics, this allows one to introduce capacitive compensation for each individual harmonic, improving the shape of the output voltage curve. The value of the equivalent capacitance of the output winding of the converter is chosen so as to provide a resonant mode according to the harmonic output frequency. Claims of Invention A ferromagnetic frequency converter containing transformers with ferromagnetic cores carrying primary and secondary windings with leads, forming an I-Phase input, a p-phased output and a C-phase intermediate frequency circuit, capacitors of capacitive compensation in different frequency circuits, different from that, in order to reduce the installed capacity of the capacitors and improve the shape of the output voltage curve, the transformer windings are made of two galvanically not connected tapes of photo; 1yi separated by diels ktrikom and each output winding is coupled with only one tape. Sources of information taken into account during the examination 1. Bamdas A, M, Kulinich V. A., Shapiro S., V. Static electromagnetic 57145906 frequency converters and number phases. 2. Bamdas AM and others, FerromagnigGosenergoizdag, M, -L., 1961, p. 17, the frequency multipliers of the Energy, 1968, rice, 2-4., p. 62, fig. 3-3. Fig-g Fig.Z eleven, -® v f.