WO2013184008A1 - Transformador trifásico tipo tambor y procedimientos para fabricar el mismo - Google Patents
Transformador trifásico tipo tambor y procedimientos para fabricar el mismo Download PDFInfo
- Publication number
- WO2013184008A1 WO2013184008A1 PCT/PE2012/000008 PE2012000008W WO2013184008A1 WO 2013184008 A1 WO2013184008 A1 WO 2013184008A1 PE 2012000008 W PE2012000008 W PE 2012000008W WO 2013184008 A1 WO2013184008 A1 WO 2013184008A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- core
- transformer
- coils
- windows
- central body
- Prior art date
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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
-
- 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
- H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0233—Manufacturing of magnetic circuits made from sheets
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/06—Coil winding
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/4902—Electromagnet, transformer or inductor
- Y10T29/49071—Electromagnet, transformer or inductor by winding or coiling
Definitions
- the invention consists of a new type of three-phase electric voltage and current transformer, useful for the transmission and distribution of electrical energy as well as manufacturing processes thereof.
- E effective voltage induced in a coil due to a sinusoidal magnetic flux variation.
- N Number of turns of the coil subjected to a variation of magnetic flux
- Req fe Equivalent reluctance of iron for the closed loop magnetic circuit through which the magnetic flux circulates.
- Each phase of the transformer, including the primary and secondary winding elements, can be represented by an electrical circuit powered by an effective voltage Vi and formed by the following set of impedances:
- X represents the reactance due to the dispersion flow concatenated with the transformer primary.
- R represents the resistance of total losses in the core
- R 2 represents the secondary winding resistance
- X d, i represents the reactance due to the dispersion flow concatenated with the secondary of the transformer.
- Z c Zé represents the impedance of the transformer load.
- I Q vacuum current varies between 0.6 - 5% of the nominal I, being I nominal the maximum current that can circulate regularly and permanently through an electric machine without damaging it.
- the transformer is constructed by placing a primary winding and a secondary winding on each of the core columns.
- the three primary windings are connected to each other in delta connection or star connection, a three-phase primary voltage is applied and in each of the secondary windings a secondary three-phase voltage is generated.
- the three secondary windings are also connected in star connection or in delta connection, according to the requirements of the corresponding load.
- This type of transformer has several decades of existence.
- the following figure shows a photograph in which the characteristic exterior appearance of the three-phase column transformer shown in Figure 2 can be observed.
- the inner core is normally constructed by superimposing plates or sheets of ferromagnetic material such as those shown in Figure 3:
- the three-phase drum-type transformer of the present invention could be considered to be winding rotor induction motors.
- Nikola Tesla developed the asynchronous or induction motor.
- the three-phase induction motor is mostly built, according to what is known as the squirrel cage rotor. It is the most used electric motor to convert electrical energy into mechanical energy.
- the asynchronous or winding rotor induction motor is also constructed.
- the rotor coils by means of sliding rings, are connected to the outside of the rotor and by means of impedances the rotational speed of the rotor can be controlled.
- stator there is a group of three three-phase windings that are the ones that connect to an external three-phase voltage source.
- Three three-phase windings are also inserted into the rotor, with an arrangement equal to that of the stator.
- Both the rotor and the stator are constructed by stacking sheets of ferromagnetic material (silicon steel) as shown in Figure 8:
- the presence of the air gap causes that, for an equivalent power, the value of Xm in the induction motor is about 10 times less than that of a similar power transformer.
- This causes the vacuum current, as already mentioned, to be excessive and it becomes inconvenient to use the asynchronous motor of the wound rotor as a transformer.
- the use of winding rotor motors as variable voltage sources (using the transformer principle), has been falling into disuse due mainly to the low efficiency due to the air gap.
- This new type of transformer comprises a magnetic ferro drum-shaped core characterized in that the drum core has a plurality of holes or windows parallel to the longitudinal axis of the drum to accommodate the windings, the windows being located near the periphery of the drum symmetrically distributed in the 360 ° of the circumference, each coil of the transformer being parallel to said longitudinal axis of the drum and each coil crossing said longitudinal axis.
- the core comprises two main components:
- the central body is formed by a plurality of silicon steel plates stacked on each other, each of which has grooves or housings on its periphery to accommodate the windings and with air gap elimination systems of the grooves or housings.
- This core can be made in four different construction modes in each variant of the transformer embodiment as will be described later. You can also have a constructive mode where the core is made only of stacked plates and where the plates have windows instead of grooves. In this construction mode, the winding of the transformer is done by hand.
- a first variant embodiment of the transformer there are six grooves or windows that extend parallel to the longitudinal axis of the drum and the primary winding and the secondary winding of each phase are housed in the same window, that is to say the winding of the secondary is on the winding of the primary winding, so that in each phase of the transformer there is no gap between the primary coil and the secondary coil.
- Figure 2 Photograph of a three-phase distribution transformer
- Figure 3 Constructive form of silicon steel plates by means of which the majority of three-phase transformer cores are constructed
- Cross section of the magnetic core (10) of a three-phase drum-type transformer that has six windows, each window (13) extends parallel to the longitudinal axis of the core, with the primary winding (1 1) and the secondary winding (12) of each phase In the same accommodation.
- a model of the first variant of the transformer is presented, characterized by a central Core (20) formed by thin sheets of silicon steel stacked on top of each other, each with six trapezoidal grooves located at the ends.
- the primary (21) and secondary (22) windings of each phase are located in the slots (also called windows).
- Each slot (23) has a trapezoidal plate (24) that fits into it so that it closes the circuit for magnetic flux.
- the figure on the left exemplifies the mode of insertion of the ferromagnetic material that closes a groove, the figure on the right shows the transformer with all its grooves closed. The elimination of the air gap is shown with the insertion of a ferromagnetic material in the openings that facilitate winding for the first variant.
- the core comprises a central body (30) and an air gap elimination system (34), each of the plates of the central body has six trapezoidal housings (33), each of which is connected by a groove (30 .a) with the outside; and the closure of the air gap consists of six groups (34) of sheets (34a) that extend parallel to the longitudinal axis and fit into the grooves once the stacking of the circular plates of the central body is carried out, and thus close the circuit for flow magnetic.
- the primary (31) and secondary (32) windings of each phase are housed in the same pair of grooves.
- the figure on the left exemplifies the mode of insertion of the ferromagnetic material, the figure on the right shows the transformer with all its windows closed.
- a fourth construction modality of the central body (40) is described, where the closure of the air gap consists of a rolled iron (44) around the central body. Also, in the transformer the primary windings (41) and the secondary windings (42) are housed in the same window.
- step a) the primary winding (21) is shown, in step b) the secondary winding (22) of the same phase, in step c ) the placement of the air gap elimination system (24), and figure 14d) shows the transformer of figure 11 already constructed.
- a second variant of the Transformer Core (50) is shown with twelve grooves or windows extending parallel to its longitudinal axis. Also, the Primary winding (51) is placed in a window other than the window in which the secondary winding (52) is placed.
- a central body (60) formed by a plurality of silicon steel plates stacked on top of each other, each of which has twelve trapezoidal grooves (63) to accommodate the primary (61) and secondary (62) windings , which are housed in different slots.
- a model of the second variant of 12 windows with air gap closure with plates is shown. It is formed by the core comprising a central body (70) and an air gap elimination system, where each of the steel plates that make up the central body has twelve trapezoidal grooves (73) each of which is communicated by a slot 70a with the outside; and the closure of the air gap consists of twelve clusters (74) of sheets (74a) that fit in the grooves, once the stacking of the circular plates of the central body has been carried out, and thus close the circuit for the magnetic flux. Likewise, the primary winding (71) and the secondary winding (72) of each phase are housed in different locations.
- the primary (81) and secondary (82) windings are housed in different locations, 30 ° apart from each other, and the air gap closure consists of a rolled iron (84) around the central body. It is important to underline that the grooves do not need to be as deep (difference not shown in the figures) as in the third modality because it is not necessary to accommodate trapezoidal plates.
- third modality Front view of a prototype transformer with plates as air gap closure.
- Second variant Longitudinal view of core prototype with 12 slots. Each primary winding and each secondary winding occupies two slots. The external winding of silicon steel plates of the type shown in Figure 13 is missing.
- Second variant, fourth mode front view of core prototype with 12 slots. Each primary winding and each secondary winding occupies two slots.
- the invention consists of a three-phase transformer for the transmission of electric energy of the type with drum-shaped core made of ferromagnetic material where: •
- the drum core has holes or windows that extend parallel to the longitudinal axis of the drum
- the transformer has three pairs of coils, corresponding to the first, second and third phases,
- Each pair of coils consists of a primary coil and a secondary coil
- the coils are distributed symmetrically around the longitudinal axis of the core, each coil being housed in a pair of diametrically opposite windows or grooves and each coil crossing said longitudinal axis.
- the material of the plates for the central body can be: silicon steel or ferrite.
- Figures 9 to 14 correspond to a first variant embodiment of the core, with six windows or slots to accommodate the six coils and Figures 15 to 19 to a second variant embodiment of the core, with twelve windows or slots to accommodate the six coils
- the core can be constructed from four different construction modalities.
- the core is made of stacked plates where the plates have windows instead of grooves.
- the winding is done by hand.
- the ferromagnetic core (10) has six windows (13) that extend parallel to the longitudinal axis of the core, the primary winding (11) and the secondary winding (12) of each phase being in the same housing.
- Figure 10 shows the cross section of Figure 9 where the plates stacked on top of each other can be seen.
- the core comprises two main components: a central body and an air gap elimination system,
- the central body (20) is formed by a plurality of silicon steel plates stacked on top of each other, each of which has six trapezoidal grooves (23) on the edge of the circumference to accommodate the windings
- the Air gap elimination system for each plate consists of six ferromagnetic elements in the form of trapezoidal plates (24) that fit into each circular plate of the central body and thus close the circuit for magnetic flux.
- the primary (21) and secondary (22) windings of each phase are housed in the same slots.
- trapezoidal plates they can be otherwise, for example, rectangular. These elements could be previously removed from the same grooves of each circular plate of the central body.
- the procedure for assembling this second modality can be one of those known in the state of the art, such as making perforations in each plate, and through it passing through hardeners at whose ends fasteners such as nuts are placed.
- the core comprises a central body (30) and an air gap removal system (34), but differs in that each of the plates of the central body has six housings in trapezoidal shape (33), each of which is connected by a groove (30.a) with the outside; and the closure of the air gap consists of six groups (34) of sheets (34a) that extend parallel to the longitudinal axis and fit into the grooves once the stacking of the circular plates of the central body is carried out, and thus close the circuit for flow magnetic.
- the primary (21) and secondary (22) windings of each phase are housed in the same pair of grooves.
- FIG 13 a fourth construction modality of the central body (40) is described, where the plates of the central body are identical to the second construction modality (20), and it differs in that the closure of the air gap consists of a rolled iron ( 44) around the central body. Also, in the transformer the primary windings (41) and the secondary windings (42) are housed in the same window. In addition, it also differs in that the grooves do not need to be as deep (difference not shown in the figures) as in the third mode because it does not need to accommodate trapezoidal plates.
- FIG 14 the manufacturing process of a transformer for the first variant, second modality is schematized. It is necessary to highlight that the air gap removal systems have been previously extracted from each of the circular plates that make up the central body.
- step a) the winding of the primary (21) is shown
- step b) the winding of the secondary (22) of the same phase
- step c) the placement of the air gap elimination system (24)
- Figure 14d) shows the transformer of Figure 11 already built.
- the second variant of the transformer core is described in Figures 15 to 19.
- this variant there are twelve windows that extend parallel to the longitudinal axis of the core and the primary and secondary winding of each phase are placed in adjacent windows.
- the primary and secondary coils alternate with the primary and secondary coils of each phase contiguous with each other and offset 30 °.
- the tension generated in the secondary windings will be 30 ° out of phase with respect to the tensions in the primary windings (due to the spatial offset of 30 °).
- FIG 15 a first constructive modality is observed for the second variant, where the core (50) has twelve windows extending parallel to the longitudinal axis of the core, in which the primary winding (51) is placed in a different window to the window in which the secondary winding (52) is placed.
- the winding is done by hand.
- Figure 16 shows a second construction modality for the second variant, where the core comprises two main components:
- an air gap closure system where the central body (60) is formed by a plurality of silicon steel plates stacked on top of each other, each of which has twelve trapezoidal grooves (63) to accommodate the primary (61) and secondary (62) windings , which are housed in different slots.
- the closure of the air gap consists of twelve ferromagnetic elements in the form of trapezoidal plates (64) that fit into the trapezoidal grooves, once the plates are stacked, and thus close the circuit for magnetic flux. Instead of trapezoidal plates they can be otherwise rectangular.
- Figure 17 shows a third modality for the second variant where the core comprises a central body and an air gap elimination system, where each of the steel plates that make up the central body (70) has twelve trapezoidal housings (73 ) each of which is connected by a slot 70a with the outside; and the closure of the air gap consists of twelve clusters (74) of sheets (74a) that fit in the grooves, once the stacking of the circular plates of the central body has been carried out, and thus close the circuit for the magnetic flux.
- the primary winding 71 and the secondary winding 72 of each phase are housed in different housings.
- each of the steel plates that make up the central body (80) has twelve trapezoidal grooves or grooves (83) where the primary windings (81) and Secondary (82) in different windows, 30 ° apart from each other, and the air gap closure consists of a rolled iron (84) around the central body.
- the grooves do not need to be as deep (difference not shown in the figures) as in the third mode because it does not need to accommodate trapezoidal plates.
- Figures 19 and 20 show a prototype for the first variant, third mode, in which the core of ferro magnetic material and the respective coils that make up the transformer are distinguished. In this prototype, the primary and secondary coils of each of the three phases are superimposed.
- Figures 22 and 23 show a prototype for the second variant, fourth mode, in which the twelve slots, the coils and the air gap closure system are appreciated. In this prototype, the primary and secondary coils of a phase are in different slots.
- Figures 24 and 25 show a prototype for the second variant, fourth modality, in which the previous prototype can be seen but with the air gap closure system already in place.
- the core manufacturing process comprises manufacturing trapezoidal windows in each of the plates of ferromagnetic material that make up the core. They will house the primary and secondary windings of the transformer, wound in such a way that the windings cross the longitudinal axis of the formed drum.
- the final aspect of the core is that of a cylinder or drum.
- the core winding could be rolled by hand when the primary and secondary windings require few turns (first modality), but as Since winding turns exceed ten, it is impractical to wind it by hand especially in large transformers.
- the ferromagnetic core is constructed in an open manner, with grooves having been made in the circumference of each plate, which allows the primary and secondary windings of the three phases to be inserted comfortably.
- the air gaps formed in the grooves or housings are closed with a plurality of pieces of ferromagnetic material in the form of plates or sheets, whereby the windows with the coils are constructed already rolled up, said coils extending along the longitudinal axis of the core.
- the windows with the coils are constructed already rolled up, said coils extending along the longitudinal axis of the core.
- a platen of ferromagnetic material is wound around the central part of the core to close the grooves ( Figure 13).
- the plates that make up the core can be silicon steel or ferrite in any of the two variants.
- the air gap closure system could consist of a ring-like crown that is placed around the central body grooved, and in another mode you can use a wedge-shaped element that extends parallel to the axis of the core to close the grooves, however, said modalities do not alter the spirit of the invention.
- any number of slots multiple of six can be implemented, where more than six coils would be used, so that the offset between each phase is smaller .
- the same central core is used by the three primary windings and the three secondary windings, unlike the transformers shown in Figures 1 and 2 and in which it can be seen that for each phase and their respective Primary and secondary windings require a different column for each phase.
- the symmetrical shape in which the core is manufactured and the windings are arranged in the proposed invention is of greater symmetry than that of the column cores shown in the figures of prior art 1 and 2, in which it can be seen that central column has a shorter length than the two lateral columns, so there is no complete symmetry between the three phases.
- the symmetrical shape in which the core is manufactured and the windings are arranged in the proposed invention is better than that of the column core shown in Figure 1, since it uses a shorter length of ferromagnetic material for the same power to be transmitted. .
- the constant modulus magnetic flux results in a constant value flux density in modulus but whose orientation varies according to the frequency f.
- flow and flux density vary alternately, so the proposed innovation takes full advantage of the ferromagnetic material.
- this invention achieves, in comparison to the three-phase transformers that are currently manufactured (which are exemplified below) and for the same transmission power, a material saving at least 30% in terms of the iron core and the copper windings. This, in turn, improves efficiency in relation to the transformers that are currently on the market, since when operating, for the same transmission power, less energy losses are generated by stray currents and hysteresis and less energy is consumed in copper windings.
- the voltage drop inside the three-phase drum-type transformer is smaller (at least 10%) than its traditional equivalent.
- the symmetrical and cylindrical shape of the three-phase drum-type transformer allows better heat dissipation, compared to the transformers currently in vogue, which also contributes to reducing the use of dissipation elements.
- Three-phase drum-type transformers can be manufactured in the entire range of powers that are currently covered with conventional three-phase transformers and become an interesting and convenient alternative for users of this type of static electric machine.
- FIG. 20 A front figure is shown in Figure 20 in which the elements constituting the three-phase drum-type transformer can be seen.
- this prototype we have worked with 0.27 mm thick silicon steel plates. The plates have been manufactured with the help of a laser cutting machine. After the plates have been manufactured, they have been stacked, pressed and welded lengthwise, as shown in Figure 21.
- the Ampere relation is fulfilled according to which the product of the secondary winding current by the number of secondary windings is equal to the reaction current in the primary multiplied by the number of secondary turns.
- the transformer of the invention can be used in any type of electrical network and for all types of power electric power transmission, it can be used in power plants to raise the generator output voltage and in the city power stations , for the different stages of reducing the electrical voltage.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR112014029595A BR112014029595A2 (pt) | 2012-06-08 | 2012-11-13 | transformador trifásico tipo tambor e procedimentos para fabricar o mesmo |
US14/406,327 US9728318B2 (en) | 2012-06-08 | 2012-11-13 | Drum-type tri-phase transformer and methods for producing same |
DE112012006471.2T DE112012006471T5 (de) | 2012-06-08 | 2012-11-13 | Trommelartiger Dreiphasentransformator und Verfahren zu dessen Herstellung |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PE2012000806A PE20141279A1 (es) | 2012-06-08 | 2012-06-08 | Transformador trifasico tipo tambor y procedimientos para fabricar el mismo |
PE00806-2012/DIN | 2012-06-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2013184008A1 true WO2013184008A1 (es) | 2013-12-12 |
Family
ID=49712313
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/PE2012/000008 WO2013184008A1 (es) | 2012-06-08 | 2012-11-13 | Transformador trifásico tipo tambor y procedimientos para fabricar el mismo |
Country Status (5)
Country | Link |
---|---|
US (1) | US9728318B2 (es) |
BR (1) | BR112014029595A2 (es) |
DE (1) | DE112012006471T5 (es) |
PE (1) | PE20141279A1 (es) |
WO (1) | WO2013184008A1 (es) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107294216A (zh) * | 2016-03-31 | 2017-10-24 | 上海交通大学 | 一种变电站磁场取能装置 |
JP6383034B1 (ja) * | 2017-03-13 | 2018-08-29 | ファナック株式会社 | リアクトル |
CN112670074A (zh) * | 2020-12-30 | 2021-04-16 | 广东科盈智能装备制造有限公司 | 一种硅钢片铁芯生产线 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4425521A (en) * | 1982-06-03 | 1984-01-10 | General Electric Company | Magnetic slot wedge with low average permeability and high mechanical strength |
JPS59190870A (ja) * | 1983-04-14 | 1984-10-29 | Rohm Co Ltd | 熱印字ヘツド |
EP0178851A2 (en) * | 1984-10-17 | 1986-04-23 | Kuhlman Corporation | Improved toroidal transformer and machines and methods for making toroidal transformers |
US4761580A (en) * | 1987-06-17 | 1988-08-02 | Magnetek, Inc. | Magnetic top wedge |
DE19960881A1 (de) * | 1999-12-17 | 2001-06-21 | Abb Research Ltd | Transformator |
US20110248589A1 (en) * | 2008-12-08 | 2011-10-13 | Konecny Frantisek | Circular transformer-generator |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1716553A (en) * | 1926-07-10 | 1929-06-11 | Ray P Higbee | Transformer |
US5317299A (en) * | 1991-07-03 | 1994-05-31 | Sundstrand Corporation | Electromagnetic transformer |
CN1141695A (zh) * | 1994-01-06 | 1997-01-29 | 玄研究室股份有限公司 | 发电机 |
US20070145959A1 (en) * | 2003-12-19 | 2007-06-28 | Chung Hyun | Assembling structure for generator |
US7948340B2 (en) * | 2007-08-29 | 2011-05-24 | Siemens Industry, Inc. | Three-phase multi-winding device |
US8836462B2 (en) * | 2011-03-22 | 2014-09-16 | Siemens Industry, Inc. | Modular reconfigurable polyphase power transformer |
-
2012
- 2012-06-08 PE PE2012000806A patent/PE20141279A1/es active IP Right Grant
- 2012-11-13 WO PCT/PE2012/000008 patent/WO2013184008A1/es active Application Filing
- 2012-11-13 US US14/406,327 patent/US9728318B2/en not_active Expired - Fee Related
- 2012-11-13 DE DE112012006471.2T patent/DE112012006471T5/de not_active Withdrawn
- 2012-11-13 BR BR112014029595A patent/BR112014029595A2/pt not_active IP Right Cessation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4425521A (en) * | 1982-06-03 | 1984-01-10 | General Electric Company | Magnetic slot wedge with low average permeability and high mechanical strength |
JPS59190870A (ja) * | 1983-04-14 | 1984-10-29 | Rohm Co Ltd | 熱印字ヘツド |
EP0178851A2 (en) * | 1984-10-17 | 1986-04-23 | Kuhlman Corporation | Improved toroidal transformer and machines and methods for making toroidal transformers |
US4761580A (en) * | 1987-06-17 | 1988-08-02 | Magnetek, Inc. | Magnetic top wedge |
DE19960881A1 (de) * | 1999-12-17 | 2001-06-21 | Abb Research Ltd | Transformator |
US20110248589A1 (en) * | 2008-12-08 | 2011-10-13 | Konecny Frantisek | Circular transformer-generator |
Non-Patent Citations (2)
Title |
---|
CORTES CHERTA, MAQUINAS OF CORRIENTE ALTERNA ASINCRONAS, vol. 3, 1 April 2008 (2008-04-01), pages 7 AND 8. * |
ISMODES ET AL.: "Transformador Trifasico Tipo Tambor", REVISTA ELECTRO ELECTRONICA N° 36, 2011, pages 22 - 23 * |
Also Published As
Publication number | Publication date |
---|---|
BR112014029595A2 (pt) | 2017-06-27 |
DE112012006471T5 (de) | 2015-03-12 |
US9728318B2 (en) | 2017-08-08 |
US20150162123A1 (en) | 2015-06-11 |
PE20141279A1 (es) | 2014-10-11 |
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