WO2000030130A1 - Endless core for a multiphase transformer and a transformer incorporating same - Google Patents
Endless core for a multiphase transformer and a transformer incorporating same Download PDFInfo
- Publication number
- WO2000030130A1 WO2000030130A1 PCT/AU1999/001006 AU9901006W WO0030130A1 WO 2000030130 A1 WO2000030130 A1 WO 2000030130A1 AU 9901006 W AU9901006 W AU 9901006W WO 0030130 A1 WO0030130 A1 WO 0030130A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- core
- windows
- transformer
- primary
- windings
- Prior art date
Links
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
- H01F27/24—Magnetic cores
-
- 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
Definitions
- the present invention relates to an endless core for multiphase transformer and a transformer incorporating such a core.
- Multiphase transformers are well known and are used in a variety of applications including for stepping up or stepping down line voltage in power transmission systems, to provide phase shifting, modulation, star-delta converters and general power supplies.
- a typical multiphase transformer has a planar core provided with a number of square or rectangular windows each window being bound by upper and lower branches of the core, and on opposite sides by vertical legs forming part of the core.
- a primary winding is wound through each window, either on a branch or leg of the window, similarly a secondary winding is would through each window.
- the core has N windows then it will have N + 1 vertical legs. This provides an inherent magnetic and therefore electrical imbalance between the phases. This arises because the magnetic flux created by current flow in the primary windings cannot circulate equally about the respective windows because of the additional vertical leg.
- each primary phase voltage is of the same magnitude and each secondary winding has the same number of turns, then the secondary outputs cannot be the same.
- an endless core for a multiphase transformer said core configured as an endless loop and having a plurality of windows formed therein through which one or more primary windings and/or secondary windings can be wound, wherein adjacent windows share a common portion of the core so that the number of windows equals the number of common core portions.
- said core is further configured to be extendable in a manner to increase the number of windows while maintaining an equal number of common core portions.
- the core is configured to be extendable in a plane containing said loop.
- the core is configured to be extendable in a direction perpendicular to the plane containing the loop.
- the core is formed as a split core to facilitate mechanical winding of the primary and/or secondary windings through the windows.
- a multiphase transformer comprising at least: an endless core in accordance with the first form of the present invention; one or more primary windings per electrical phase linked with selected windows to produce lines of magnetic flux that circulate at least about those windows; and, one or more secondary windings linked with one or more of said windows so that the lines of magnetic flux circulating about the window through which a secondary winding is linked induces current in that secondary winding.
- the transformer is provided with a single turn secondary winding linked with each window where the secondary windings are in mutual electrical connection.
- Figure 1 is a perspective view of a core in accordance with the present invention and a six phase transformer incorporating that core;
- Figure 2 is a perspective view of a second embodiment of the core and a 12 phase transformer incorporating that core;
- Figure 3 is a perspective view of a third embodiment of the core in accordance with the present invention.
- Figure 4 is a perspective view of a fourth embodiment of the core.
- Figure 5 is a cutaway perspective view of an electric motor incorporating a core in accordance with the present invention.
- FIG. 1 there is illustrated an endless core 10 for a multiphase (in this example, six phase) transformer 12.
- the core 10 is formed as an endless circular or annular loop.
- a plurality of windows 14,-14 6 (referred to in general as windows 14 s ) are formed through and about the core 10.
- Adjacent windows 14, share a common portion or leg 16, j where , and j designate the adjacent windows.
- leg 16 1 2 is the portion of core 10 between adjacent windows 14, and 14 2 ; and leg 16 45 is the portion or leg of core 10 between adjacent windows 14 4 and 14 5 .
- Each window 14 is bound on opposite sides by the adjacent, core portions or legs 16, j and, by upper and lower branches B H and B,.
- window 14 is bound on the left side by common core portion 16, 2 ; on the right side by common core portion 16 6 1 ; upper branch B u ; and, lower branch B,.
- Multiphase transformer 12 is constructed by winding respective primary and secondary windings through the windows 14,.
- primary windings 18, and 18 6 (referred to in general as primary windings 18,) link with respective windows 14,. More particularly, two primary windings 18, (of the same phase) are provided for each window 14,, with one primary winding about the upper branch B u and another primary winding about a lower branch B, of each window 14,. For example, looking at window 14, a pair of primary windings 18, is provided, one of each formed about the upper branch B u and lower branch B, of the window 14,.
- secondary windings 20 s , - 20 s6 can be wound for example about the lower branch B, of each window 14, - 14 6 respectively.
- the secondary windings 20 s , - 20 s6 can be placed about the upper branches B u of each window or even alternate between the upper and lower branches.
- the core 10 and transformer 12 provide the ability to have secondary output of equal magnitude where the secondary windings 20 s , - 20 s6 have the same number of turns.
- the core 10 and transformer 12 also allow for an infinite possibility of phase shifting or combining. If one wanted to obtain a secondary output of a phase halfway between the phase of say the primary voltages supplying primary windings 18, and 18 2 then a secondary winding 20 p (shown in phantom) can be wound through both windows 14, and 14 2 ie about the common core portion 16, 2 . Now, the second winding 20 p links with the magnetic flux ⁇ , and ⁇ 2 and thus the secondary output is of a magnitude and phase corresponding to the vector or phasor addition of the voltage induced by fluxes ⁇ , and ⁇ 2 . This provides a 1:1 transformed combination of the phases feeding primary windings 18, and 18 2 .
- the core 10' is again in shape of a ring or annulus but this time provided with twelve windows 14, - 14, 2 and twelve common core portions 16, j , one of each between respective adjacent windows 14,.
- a primary winding 18, is wound about lower branch B, of each window 14,.
- a secondary winding 20, is wound about the upper branch B u of each window 14,.
- the phase of the output of any secondary winding 20, is the same as the phase of voltage driving the corresponding primary winding 18,.
- the secondary winding 20 can be wound partially about the upper and lower branches B u and B, or common core portions 16, j of different windows in any desired combination to produce a desired phase output in accordance with standard transformer design technics.
- Figure 3 illustrates an extending (vertically stacked) core 10" and a multiphase transformer 12" constructed using the core 10".
- the core 10" can be considered as being two six window cores vertically stacked upon each other.
- the core 10" has a lower set of windows 14, - 14 6 and an upper set of windows 14 7 - 14, 2 with windows 14, and 14, +6 in vertical alignment.
- Primary windings 18, - 18 6 are wound about the lower branches B, of windows 14, - 14 6 respectively; and, primary windings 18 7 - 18, 2 are wound about the upper branches B, of the upper set of windows 14 7 - 14 1 2 .
- a set of secondary windings 20 are wound about the middle branch B m between vertically adjacent windows 14 token 14, +6 .
- any particular secondary winding 20 would be the transformed phasor or vector addition of voltages induced by the magnetic flux generated by the primary windings linked with the windows common to that particular secondary winding 20.
- the volume of core constituting the middle branch B m is the sum of the volume of the core constituting the lower branch B, and upper branch B u of the windows 14 administrat 14, +6 . This embodiment then allows the combination of two six phase supplies that are out of phase with each other.
- the two power sources can be combined to provide a six phase output through the secondary windings 20.
- the core configuration will also allow for the ability to have 6 primary and 12 secondary windings. Also a turns ratio of 1/0.5 primary to secondary, or secondary to primary, as well as incorporating other windows will produce any fraction of volts required.
- the primary windings 18, - 18, 2 of transformer 12" can be connected to a different phase of a twelve phase power supply and primary windings 20 round through various windows 14, to provide a transformed twelve phase output.
- the phasing of the output from the secondary windings can be arranged as required in accordance with known transformer design techniques to provide the desired secondary phase output.
- Figure 4 further illustrates a further embodiment of the core 10"' and a corresponding 12'".
- the core 10 and windows 14, are arranged so that the core 10, 10' and 10'" is endless about a first axis that is perpendicular to the axis of any particular window 14,.
- the axis of the core 10 is parallel with the axis of any window 14,.
- core 10"' is configured as an endless loop having a plurality of windows 14, where adjacent windows share a common portion of core 16, j so that they number of windows 14, equals the number of common core portions 16, j .
- three windows 14, - 14 3 are formed in the core 10'" with a primary winding 18, - 18 3 respectively wound about the lower (radially outer most) branches B, of each window 14,. Respective secondary windings 20, - 20 3 are wound through the windows 14, - 14 3 respectively about the corresponding upper (radially inner most) branches B u . It is preferred that the core 10'" is configured so that the volume of core in the upper and lower branch portions B relieve B u of each window 14, is the same. This assists in avoiding saturation of the core. This can be achieved by appropriate placement or configuration of the windows 14,.
- FIG 5 illustrates an application of the core 10 shown in Figure 1.
- the core 10 is used in this application in a transverse flux motor 26. Full operation and constructional details of the transverse flux motor are described in the Applicant's Australian Application No PP 7124 the contents of which is incorporated herein by way of reference.
- the structure of core 10 and the placement of primary windings 18, - 18 ⁇ is identical to that described in the first embodiment described in relation to Figure 1. However, instead of multi turn electrically separate secondary windings a single turn secondary winding between 20, is provided about each common core portion 16, j with each of the single turn secondary windings 20, being in mutual electrical connection.
- the single turn secondary windings 20, - 20 6 form a wheel like structure 30 having an inner rim 32 and outer rim 34 joined by radially extending spokes 36.
- the outer rim 34 is depicted as residing in the air gap 38 of a cockcroft ring 40.
- currents are induced through the single turn secondary windings 20, - 20 6 that interact with magnetic flux passing through the air gap 38 of the cockcroft ring 40 thereby generating transverse forces on the outer rim 34 of the wheel 30 causing it to move.
- the path of motion of the wheel 30 can be controlled at will by variation of the magnitude and frequency of the primary voltages supplied to the primary coil 18, - 18 ⁇ and the phase relationship therebetween.
- the core 10 is depicted essentially as being in a ring, annulus or circular type form.
- the core 10 is depicted essentially as being in a ring, annulus or circular type form.
- it can assume other shapes provided that it is continuous or endless and is provided with equal numbers of windows and common core portions.
- the exact number of windows provided is simply dependent upon the application and in particular the number of primary phases.
- the position and placement of the secondary windings 20, is dictated solely by the desired magnitude and phase of the secondary outputs.
- the core 10, 10', 10", 10"' can be made by casting; continuous stamping and winding of an insulated strip of magnetically permeable material; winding of a strip of material then machining/cutting the windows. Further the core can be split through a plane passing through the windows 14; to facilitate mechanical/automatic winding of the primary and/or secondary windings about the window branches B u , B benefit or loading of prewound bobbins on the common core portions 16 tJ . All such variations and modifications together with others that would be obvious to a person of ordinary skill in the art are deemed to be within the scope of the present invention the nature of which is to be determined from the aforegoing description.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Of Transformers For General Uses (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU15351/00A AU773539B2 (en) | 1998-11-13 | 1999-11-12 | Endless core for a multiphase transformer and a transformer incorporating same |
EP99957729A EP1129458A4 (en) | 1998-11-13 | 1999-11-12 | Endless core for a multiphase transformer and a transformer incorporating same |
CA002350485A CA2350485A1 (en) | 1998-11-13 | 1999-11-12 | Endless core for a multiphase transformer and a transformer incorporating same |
IL14310899A IL143108A0 (en) | 1998-11-13 | 1999-11-12 | Endless core for a multiphase transformer and a transformer incorporating same |
BR9915261-4A BR9915261A (en) | 1998-11-13 | 1999-11-12 | Endless core for a multi-phase transformer and a multi-phase transformer that incorporates the same |
JP2000583051A JP2002530852A (en) | 1998-11-13 | 1999-11-12 | Endless cores and transformers incorporating endless cores for polyphase transformers |
NO20012270A NO20012270L (en) | 1998-11-13 | 2001-05-09 | Endless core for a multiphase transformer and a transformer incorporating it |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AUPP7124 | 1998-11-13 | ||
AUPP7124A AUPP712498A0 (en) | 1998-11-13 | 1998-11-13 | Electric motor |
AUPQ0358A AUPQ035899A0 (en) | 1999-05-13 | 1999-05-13 | Endless core for a multiphase transformer and transformer incorporating same |
AUPQ0358 | 1999-05-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000030130A1 true WO2000030130A1 (en) | 2000-05-25 |
Family
ID=25645928
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU1999/001006 WO2000030130A1 (en) | 1998-11-13 | 1999-11-12 | Endless core for a multiphase transformer and a transformer incorporating same |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1129458A4 (en) |
JP (1) | JP2002530852A (en) |
BR (1) | BR9915261A (en) |
CA (1) | CA2350485A1 (en) |
IL (1) | IL143108A0 (en) |
NO (1) | NO20012270L (en) |
WO (1) | WO2000030130A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100289489A1 (en) * | 2008-10-10 | 2010-11-18 | Takashi Tadatsu | Magnetic bridge for sensor in which magnetic fluid is used, current sensor in which magnetic bridge is used, and magnetic field sensor |
JP5896371B2 (en) * | 2011-08-18 | 2016-03-30 | 東北電力株式会社 | Three-phase electromagnetic equipment |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU4209585A (en) * | 1984-05-09 | 1985-11-14 | Tyree, A.W., Transformers Pty. Ltd. | Three phase transformer core |
US5146198A (en) * | 1991-06-28 | 1992-09-08 | Westinghouse Electric Corp. | Segmented core inductor |
RU2082245C1 (en) * | 1994-11-08 | 1997-06-20 | Сингаевский Николай Алексеевич | Multiphase transformer |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE140502C (en) * | ||||
US3323069A (en) * | 1961-11-21 | 1967-05-30 | High Voltage Engineering Corp | High voltage electromagnetic chargedparticle accelerator apparatus having an insulating magnetic core |
US4099066A (en) * | 1976-08-17 | 1978-07-04 | Beggs William C | Pulse generating system with high energy electrical pulse transformer and method of generating pulses |
DE4310199A1 (en) * | 1993-03-29 | 1994-10-06 | Michael Krafft | Three-phase transformer |
DE29503048U1 (en) * | 1995-02-23 | 1995-04-13 | Krafft, Michael, 59759 Arnsberg | Three-phase transformer |
-
1999
- 1999-11-12 EP EP99957729A patent/EP1129458A4/en not_active Withdrawn
- 1999-11-12 WO PCT/AU1999/001006 patent/WO2000030130A1/en active IP Right Grant
- 1999-11-12 IL IL14310899A patent/IL143108A0/en unknown
- 1999-11-12 CA CA002350485A patent/CA2350485A1/en not_active Abandoned
- 1999-11-12 JP JP2000583051A patent/JP2002530852A/en active Pending
- 1999-11-12 BR BR9915261-4A patent/BR9915261A/en not_active Application Discontinuation
-
2001
- 2001-05-09 NO NO20012270A patent/NO20012270L/en not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU4209585A (en) * | 1984-05-09 | 1985-11-14 | Tyree, A.W., Transformers Pty. Ltd. | Three phase transformer core |
US5146198A (en) * | 1991-06-28 | 1992-09-08 | Westinghouse Electric Corp. | Segmented core inductor |
RU2082245C1 (en) * | 1994-11-08 | 1997-06-20 | Сингаевский Николай Алексеевич | Multiphase transformer |
Non-Patent Citations (2)
Title |
---|
DATABASE WPI Derwent World Patents Index; Class X12, AN 1998-085450/08, XP002952817 * |
See also references of EP1129458A4 * |
Also Published As
Publication number | Publication date |
---|---|
NO20012270D0 (en) | 2001-05-09 |
EP1129458A1 (en) | 2001-09-05 |
BR9915261A (en) | 2002-07-30 |
IL143108A0 (en) | 2002-04-21 |
JP2002530852A (en) | 2002-09-17 |
EP1129458A4 (en) | 2002-02-06 |
CA2350485A1 (en) | 2000-05-25 |
NO20012270L (en) | 2001-07-05 |
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