Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F27/00—Details of transformers or inductances, in general
  • H01F27/28—Coils; Windings; Conductive connections
  • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F27/00—Details of transformers or inductances, in general
  • H01F27/02—Casings
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F27/00—Details of transformers or inductances, in general
  • H01F27/24—Magnetic cores
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F27/00—Details of transformers or inductances, in general
  • H01F27/28—Coils; Windings; Conductive connections
  • H01F27/2823—Wires
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F30/00—Fixed transformers not covered by group H01F19/00
  • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
  • H01F30/12—Two-phase, three-phase or polyphase transformers
  • H01F30/14—Two-phase, three-phase or polyphase transformers for changing the number of phases

Definitions

• the present invention relates to the general field of transformers.
• the invention relates to a fixed-phase, three-phase, fixed-phase, forced-flow transformer.
• the Scott fixture uses two single-phase transformers.
• the first has its primary of ni turns mounted between terminals A and B of the three-phase network.
• the primary of the second has r 'turns and is mounted between the terminal C of the three-phase network and the midpoint M of the primary of the first.
• the two secondary phases have the same number n 2 of turns.
• the Scott fixture has several disadvantages.
• the magnetic circuits of the two single-phase transformers represent a mass and a large bulk.
• the windings of the two transformers must be different three-phase side since they do not have the same number of turns. Since the number of turns of the three-phase phases is different, the sections of the electrical conductors must be different in order to guarantee the balance of the resistances of each phase.
• the star connection is imposed and therefore we can not play on the ratio of voltages with a connection triangle or zig-zag.
• the Leblanc assembly uses a magnetic circuit with three, four or five columns. In the case of a three-column magnetic circuit, it is a forced-flux transformer forced, which limits the magnetizing current.
• the Leblanc assembly also has drawbacks.
• the windings of the two-phase phases must be different because they do not have the same number of turns.
• the coils on the two-phase side are distributed on three columns in a non-symmetrical manner, which leads to different leakage inductances. Since the number of turns of each phase on the two-phase side is different, different electrical conductor sections are needed to balance the resistance of each phase.
• the invention proposes a three-phase-two-phase transformer comprising a magnetic circuit, three-phase coils and two-phase coils, in which
• the magnetic circuit comprises a first column, a second column and a third column connected magnetically,
• the three-phase coils comprising a first coil of turns around the first column, a second coil of turns around the second column and a third coil of turns around the third column,
• the two-phase coils comprise a fourth coil of n 2 turns around the first column, a fifth coil of n ' 2 turns around the first column, a sixth coil of n 2 turns around the third column and a seventh coil of n' 2 rounds around the third column,
• the fourth coil and the seventh coil being connected in series and forming a first two-phase phase, the fourth coil and the seventh coil each having a corresponding winding direction, for a current flowing in the first two-phase phase, to magnetic potentials of the same direction ,
• the fifth coil and the sixth coil being connected in series and forming a second two-phase phase, the fifth coil and the sixth coil each having a corresponding winding direction, for a current circulating in the second two-phase phase, to magnetic potentials of the same direction.
• This transformer has, on the three-phase side, a structure comparable to that of a three-column Leblanc-type transformer. It thus allows, compared to the use of two single-phase transformers, a flux coupling which makes it possible to reduce the mass and the volume of the magnetic circuit and to limit the magnetizing current.
• the two phases of the two-phase side have the same number of turns (namely n 2 + n ' 2 ), it is not necessary to use different section conductors to ensure the balance of the resistors.
• n 2 (2 + V 3) n ' 2 .
• the second column is a central column located between the first column and the third column.
• the three-phase coils and the two-phase coils are distributed symmetrically on the side columns, which makes it possible to balance the leakage inductances.
• the first column is a central column located between the second column and the third column.
• the magnetic circuit has a symmetry with respect to an axis of rotation passing through the central column and / or with respect to a plane of symmetry passing through said central column.
• the transformer further comprises at least one additional set of three-phase coils or two-phase coils.
• the transformer then makes it possible to feed in a balanced manner any number of loads other than 1.
• FIG. 1 represents a transformer according to a first embodiment of the invention
• FIGS. 2 and 3 are electrical diagrams illustrating the operation of the transformer of FIG. 1,
• FIG. 4 is a graph showing the currents in the transformer of FIG. 1,
• FIG. 5 represents a transformer according to a second embodiment of the invention
• FIG. 6 is an electrical diagram illustrating the operation of the transformer of FIG. 5, and
• FIG. 7 and 8 each show, in perspective, a magnetic circuit with three columns can be used to produce a transformer according to the invention.
• FIG. 1 is a front view of a transformer 1 according to one embodiment of the invention.
• Transformer 1 is a fixed-phase, three-phase transformer with forced bonded flux.
• the transformer 1 comprises a magnetic circuit 2, three-phase coils and two-phase coils.
• the three-phase coils correspond to the primary of the transformer 1 and the two-phase coils correspond to the secondary of the transformer 1.
• a reverse mode of operation is of course possible.
• the magnetic circuit 2 comprises three magnetically connected columns: a lateral column 3, a central column 4 and a lateral column 5, connected by bars 13.
• the magnetic circuit 2 is symmetrical with respect to an axis of rotation passing through the central column 4 and / or with respect to a plane of symmetry passing through the central column 4.
• the three-phase coils comprise a coil 6 around the lateral column 3, a coil 7 around the central column 4 and a coil 8 around the lateral column 5.
• the two-phase coils comprise a coil 9 and a coil 10 around the lateral column 3, and a coil 11 and a coil 12 around the lateral column 5.
• FIG. 2 is an electrical diagram of the transformer 1 of FIG.
• the coil 9 has n 2 turns and is connected in series with the coil 12 which has n ' 2 turns.
• the coils 9 and 12 correspond to a first two-phase phase.
• Ii the current and Vi the voltage of the first two-phase phase.
• the winding direction of the coils 9 and 12 is symbolized by a black dot. It corresponds, for a given current Ii, to magnetic potentials n 2 Ii and n ' 2 Ii of the same direction in columns 3 and 5.
• the coil 11 has n 2 turns and is connected in series with the coil 10 which has n ' 2 turns.
• the coils 11 and 10 correspond to a second two-phase phase. Note I 2 the current and V 2 the voltage of the second phase diphasée.
• the winding direction of the coils 10 and 11 is also symbolized by a black dot. It corresponds, for a given current I 2 , to magnetic potentials n 2 I 2 and n ' 2 I 2 of the same direction in the columns 5 and 3. This direction can be the same as that of the magnetic potentials n 2 Ii and n 2 Ii of the first two-phase phase, as in the case of Figure 2, or the opposite direction, as in the case of Figure 3 which shows an alternative embodiment.
• the transformer 1 has, on the three-phase side, a structure comparable to that of a three-column Leblanc-type transformer. It thus allows, compared to the use of two single-phase transformers, a flux coupling which makes it possible to reduce the mass and the volume of the magnetic circuit and to limit the magnetizing current.
• the transformer 1 makes it possible to obtain secondary voltages Vi and V 2 of the same value and in quadrature.
• the transformer 1 acts on the phase shift between the primary and secondary, but provides secondary currents Ii and I 2 out of phase +/- n / 2 and secondary voltages V 1 and V 2 out of phase.
• V 2 jVi
• FIG. 4 is a graph which represents in the Fresnel frame the three-phase currents and the two-phase currents of the transformer 1 of FIG.
• a transformer may comprise several secondary.
• the transformer 1 comprises, in addition to the secondary formed by the coils 9 to 12, at least one other three-phase secondary and / or at least one other two-phase secondary, which can be realized in the same way as that in the form of coils 9 to 12.
• FIGS. 5 and 6 are similar to FIGS. 1 and 2, respectively, and represent a transformer 20 according to a second embodiment of the invention. Elements identical or similar to elements of transformer 1 of FIG. 1 are designated by the same references and are no longer described in detail.
• the positions of the coils 6, 9 and 10 on the one hand and the coil 7 on the other hand are inverted with respect to the transformer 1: the coils 6, 9 and 10 surround the central column 4 and the coil 7 surrounds the side column 3.
• the transformer 20 is substantially identical to the transformer 1.
• the transformer 20 has the same advantages as the transformer 1.
• the transformer 20 has currents and voltages in phase quadrature. The ratios of currents and voltages quoted above are preserved.
• the transformer 20 no longer has the same two-phase side symmetry, which implies a possible difference in the leakage inductances of the two-phase phases.
• a transformer according to the invention may comprise a magnetically connected three-column magnetic circuit which has another topology.
• FIGS. 7 and 8 each represent, in perspective, a three-column magnetic circuit that can be used to produce a transformer according to the invention.
• the same references as in Figures 1 and 5 are used to designate corresponding elements, without risk of confusion.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Coils Of Transformers For General Uses (AREA)
• Coils Or Transformers For Communication (AREA)

Applications Claiming Priority (2)

Publications (2)

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• 2012
  • 2012-04-06 FR FR1253183A patent/FR2989213B1/fr active Active
• 2013
  • 2013-04-03 EP EP13719972.5A patent/EP2834820B1/de active Active
  • 2013-04-03 CN CN201380021377.9A patent/CN104246927B/zh active Active
  • 2013-04-03 RU RU2014144686A patent/RU2638151C2/ru active
  • 2013-04-03 JP JP2015503920A patent/JP6247282B2/ja not_active Expired - Fee Related
  • 2013-04-03 WO PCT/FR2013/050731 patent/WO2013150240A1/fr active Application Filing
  • 2013-04-03 CA CA2869347A patent/CA2869347C/fr not_active Expired - Fee Related
  • 2013-04-03 US US14/390,929 patent/US9214272B2/en active Active
  • 2013-04-03 BR BR112014024810-9A patent/BR112014024810B1/pt not_active IP Right Cessation

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