CA1169226A - Apparatus for electromagnetic stirring - Google Patents
Apparatus for electromagnetic stirringInfo
- Publication number
- CA1169226A CA1169226A CA000394922A CA394922A CA1169226A CA 1169226 A CA1169226 A CA 1169226A CA 000394922 A CA000394922 A CA 000394922A CA 394922 A CA394922 A CA 394922A CA 1169226 A CA1169226 A CA 1169226A
- Authority
- CA
- Canada
- Prior art keywords
- mold
- windings
- axis
- core
- extents
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/34—Arrangements for circulation of melts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
- H05B2213/02—Stirring of melted material in melting furnaces
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Continuous Casting (AREA)
- Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
Abstract
A B S T R A C T
Electromagnetic stirring apparatus in a con-tinuous casting mold has a magnetic circuit extending about the mold and at least two pairs of windings arranged to carry current in one direction on the inside of the magnetic material and in the other direction on the outside of the magnetic material.
The windings in a pair are located opposite each other across the axis of the mold whereby they may be energized by the same phase of alternating current to produce in the respective inside extents of such opposed pair of windings, simultaneous current in the opposite sense on opposite sides of the mold.
Electromagnetic stirring apparatus in a con-tinuous casting mold has a magnetic circuit extending about the mold and at least two pairs of windings arranged to carry current in one direction on the inside of the magnetic material and in the other direction on the outside of the magnetic material.
The windings in a pair are located opposite each other across the axis of the mold whereby they may be energized by the same phase of alternating current to produce in the respective inside extents of such opposed pair of windings, simultaneous current in the opposite sense on opposite sides of the mold.
Description
~ ~9~6 This invention relates to electromagnetic stirring apparatus for the provision of a magnetic field rotating about the path of steel through a continuouq casting mold, the purpose of such field being to cause rotation of the steel, which is still liquid, in the mold.
sy the term 'axis of the mold' herein is meant line extending in the direction of flow through the mold at the approximate centre of such f low .
In my co-pending Canadian Application S.~.372,679 filed March 10, 1981 and assigned to a common assignee, there is described electromagnetic stirring apparatus which eliminates the use of radially (relative to the mold axis) directed pole pieces associated with the magnetic field rotation apparatus surrounding the core. Omitting such pole pieces, the prior Canadian Application 372,579 provlded coils (corresponding to each phase of the exciting A~Co current) which were made up of turns extending down one side of the mold, half-way about the mold, up the opposite side, half-way about the mold down the one side and so on. Such windings produced a magnetic field extending across the mold and together with similar windings cyclically dis-posed about the mold and subject to multi phase energization produce a rotating magnetic field in the mold. Although such arrangement has been successful and the elimination of the pole pieces an advantage, such arrangement has had the disadvantage that for each coil, each turn extent running axially of the mold (which is the p-ortion of the turn effecting the production of the rotatiny magnetic field) has required a connecting extent ~`
sy the term 'axis of the mold' herein is meant line extending in the direction of flow through the mold at the approximate centre of such f low .
In my co-pending Canadian Application S.~.372,679 filed March 10, 1981 and assigned to a common assignee, there is described electromagnetic stirring apparatus which eliminates the use of radially (relative to the mold axis) directed pole pieces associated with the magnetic field rotation apparatus surrounding the core. Omitting such pole pieces, the prior Canadian Application 372,579 provlded coils (corresponding to each phase of the exciting A~Co current) which were made up of turns extending down one side of the mold, half-way about the mold, up the opposite side, half-way about the mold down the one side and so on. Such windings produced a magnetic field extending across the mold and together with similar windings cyclically dis-posed about the mold and subject to multi phase energization produce a rotating magnetic field in the mold. Although such arrangement has been successful and the elimination of the pole pieces an advantage, such arrangement has had the disadvantage that for each coil, each turn extent running axially of the mold (which is the p-ortion of the turn effecting the production of the rotatiny magnetic field) has required a connecting extent ~`
2 2 fi running half-way about the mold to a corresponding turn extent on the other side. Such connecting extent~ corresponding in number to each half turn in the winding have been cu~bersome and have inter~erred with and caused undesireable modi~ication to tha de~ign of the molding apparatu~ as a whole.
It i~ the o~ject of thi~ application to provide a design for providing a rotating elactromagnetic field for a continuous casting mold which eliminatas the need for pole pieces but also provide3 the vertical turn extents for the desired magnetic field without the necessity of large numbers o~ connecting extent~.
It is an object of the invention to provide electromagnetic stirring apparatus having pairs of windings located on opposite sides of ~he mold corresponding to each phase~ Pairs o~ ~uch windings are provided correspondi~g to each phase and such : windings are cyclically arranged about the mold. By 'cyclically' is meant that, ( ~or example with two phases ) the windings will be arranged PhaJe 1+, Phase 2~, Phase 1- and ~o on about the mold and with three phase~ the winding~ are arranged' Phase 1~, Phase 2~, Phase 3~, Phase 1- a~d ~o on about the mold~
Each of the windings compri~es a plurality of turns wound on a core arranged to have a long extent of a turn on the mold-adjacent and on the mold remote sides of the core, and short connecting extents connecting the long extents which thus alternate in3ide and outside the core. Such a winding provides the plurality of nearly vertical turn extents adjacent the mold.
The combination of ~uch winding having such mold adjacent turn extents carrying current in one 9~ the upward or downward 922~
directions with its counterpart coil o the same phase with its mold adjacent extents carrying curren in the opposite direction to the first, i5 to provide flux acro3~ the mold in a sense determined by the mold adjacent current directions and perpendicular thereto. Coupled with the e~fects of the pairs of coils of other phases there is produced the desired rotating field in the mold which will rotate the molten ~teel being continuously cast therein. A core is provided for each coil. Mag~etic material is preferably provided substanti-ally joinin~ ~he ends o~ the cores of adja~ent coil9 asencountered moving about the mold. With such joining magnetic material there i~ provided a magnetic circuit extending about the mold.
Test~ have indicated that the magnetic field e~fects i=side the mold are at their max~m in the vertical exten~
opposite the core and drop off rapidly at locations àlong the : axis beyond the core~ Accordingly, it is pre~erred that the core shall have the shape of the co~l cross ~ection, having in radial crQSs ~ection relative to the axis of the mold a long dimen~ion axially of t~e mold (~or the approximate ex~ent desired ~or the effective operation of the rotating ~ield) and a shoEt dimen~ion mea~ured in a radial direction.
The long turn extents of each winding on the side of the core remote from the mold do not contribute to the desired field in ~he mold. ~owever due partially to the pre ence of the core ~uch mold-remote extents do not materially detract from ~uch field. It is noted that with such arrange-ment of paixed coils on opposite side~. of the mold, these :~ 16~22~
paired coil~ may be connected in ~erieq to the phase supply, requiring only a ~ingle connection between the one end of a paired coil and one end of the other paired coil. ThU8 the cumbex~ome multiple connections of the apparatu~ ~hown in r~-rur~ 6~~mn~~}~e~ (previously re~erred to) are avoided. (It i~ noted that in apparatus arranged in accord with thi invention, that co~necting the paired coil~ in parallel may further reduce the connec~ion3 between the coils).
However, the serie~ connection between the coils i8 preerred since the u o~ a ~ingle type o~ c~rrent capacity-conductor--ren~ers fabricatiQn si~pler.
In drawing~ which illustrate preferred e~bodiment~
o~ the inve~tio~ :
Figure 1 i5 a horizontal cro~3-section o~ the , i~ventive electromagnetic stirrillg apparatu for a ContinuouR
casting mold, Figuro 2 is a partial vertical cro~s-sectio~ along the line~ 2-2 of Figure 1, ~igure 3 is a schematic indication of the winding connections fo~ a mold, Figuro 4 i~ a plan view o~ a ~orm o~ the electro-magnetic atirring apparatus which i9 an alternative to that YhOwn in ~igure 1, Figuro S i9 a vertical cro~ section along the lines 5 5 of Figure 4, Figure 6 ~chematically indicates the application of th2 in~ention to three phase wiring, Figure 6A shows the three pha~e connectio~ of the windings in Figure 60 1 ~L69?,26 In Figure 1 i9 shown a rectangular continuous casting mola defined by mold wall 10. A cooling pipe xletwork iR provided for cooling the mold along with water inlet and outlet conduit~ 12 and 14. These are not descri}:ed in defail ~ince they are well known and conventional in the confinuous ca~ting axts. As indicated in Figure 2 the mold walls to the left and right o~ the Figure are slightly curved to be concave to the right., Such curvature, . in one o~ the four directions is provided in modern molds to allow the billet direction to be gradually altered from one direction (here vertical) to another (here horizontal). older mols3s have straight wall ~ide~ and both types are within the scope oi~ the invention.
Corresponding to each side of the mold is provided a coil cvmprising a core 15 and a multi-turned windi~g 16 wound thereonO Figure 1 is a horizor~tal section. As Figure ~ indi-cates the winding scgment~ shown on each ~side o the coxe are joined over the top and bottom of the coxe.
Core 15 a~ show~ extends, in plan view, approximately 20 the length of the mold ~ide. It is relatively thin in v~tical cross-~ection~ It is shown as co~tructed of three laminations of suitable magnetic core material ~ivetted together~ However the laminated arra~gement is merely ~or ease o~ rication and the desired dimension~ o~ core 15 of suitable magnetic material may be achieved in any desired way. As indicated, the core 15 is provided with a long dimension in it~s axial direction relative to its thickness and to the axial height of the core. The axial height and axial location of the core 1 ~922~i dP~ines e~ectively the effective axial height of the rotating electromagnetic field in the mold.
As indicated in Figureq 1 and 2 a windi~g iq formed by turns having a long axial dimen~ion extent down one side of the core, a qhort radial transverse extent about the lower edge, a lon~ axial extent up the other side of the core, about the upper e~ge again, down the mold and so on. The core, wound in this way, may be provided with the number o~ layexs and of turns de~ires~. Such a winding is provided with leads 18 and 20 which are coImected, (and the winding i~ wound~ 90 that the ourrent ~lowq in one directio4 (up or down) on one side o the core and in the opposite direction on the other.
The winding~ are paired on opposite sides of~the mold and are connected in ~ierie~ which series connection, together with the : winding direckion,is used to provid~e that the mold-adjacent exte~ts (i.e. the paxt~ of the winding turns between the core and the mold) carry ( at an in~tant in the A . C. energization) current down in the winding on mold-adjaoent long extents on one side o~ ~he mold and c!urrent up in the mold adjacent long extents o~ the paired coil on the other side of the mo}d. Such c:urrentq will produce a field acro~ the mold having its main component tra~sverse to both the mold axis and to the diameter extending b~twe~n the centre of the paired windings. Whe~ the magnetic efects of such paired coil~ are combined with the fi~ld produced by the other two paired coils, and the two pair~ o~ coils are respectively excited by the two phases o~ a two phase relation3hip, a rotating magnetic ~ield i~ produced in the mold which cause~ rotation of that steel in the mold ~ ~92~
which is in it~ liquid state.
Figure 3 repre~ent3 ~chematically the two ~et~ of paired winding~ 16~in relation to input leads and the mold wall 10~ ~hu~ one pair of windings 16 i9 connected in series between the pha~e 1 power input P and neutral connection ~
while the other pair o~ coils 16 i~ connected by two connection 22 in series between tha phase 2 power input Q and the neutral connection ~. It will he noted that, in di~tinctlon from prior art arrangements, that only one connection i~ required between pai~ed ~i~ w~l al~o be noted that there would be no greater number of con~ection~ i~ the pair~d coil3 wer~ connected ia parallel). It will alss be noted that whe~ the two ~at~ of paired coils are enargized with two phase power, with a phase ; a~gl~ o~ 90 between the p~ases, that th~re is created desired rotating electromagnetic field . and having a rotational ~requency equal to the exciting frequency of each pha~e~ ~It is wi~hin -th~ scope of the invention to provicle multiple pair~ of coils per pha~ lically arranged about t~e mold~ As indicated in the schematics o~ Figu~e 3, the ~erie~ connection o the paired opposite windings 16 only require a single conductor 22 between the ~eries connected winding~ which cvnductor 22 ~xtends hal~-way about th~ mold and (i the input lead P, Q and N are both on the same side o~ t~ assembly) a conductor from the non-series connected--end:o~one of the coil~ which i9 remote ~rom the inpu~ lsad~ Pt Q and N round to the side of the i~put lead~.
Thu~ with thi~ invention cumber~ome multiple lead~ are avoided.
A~ explained in the introduction, the oppo~ed paired windings 16 may be con~ected in parallel across the re~a~t phase of the i922~
two phase supply and with such parallel connection no more and possibly less leads are required about the mold.
To complete the magnetic circuit about the mold, which i~ desireable, magnetic core material is provided in the cor~er me~ber~ 24 which are triangular in plan view and extend fcr the approximate height of the core. The me~ ers 24 about the end~ of core members 15 on each side of a respective corner to provide with such core members a substantially continual magnetic circuit about the mold.
Figureq 4 and 5 show an arrangement where the magnetic circuit i3~ in e fect, a unitary core member 28, ormed of magnetic material, extending about the core, although it may be formed of ~eparate connected members i desired. On each of the ~our ~ides of the core, two peripherally designed recease~ 30 are provided for providing that the windi~ga 32 on each side of the mold may be wound in two sections for :
convenienc~ of winding. ~he two ~e~l~ions on each aide of a core are conn~cted in series and the paired windings 32 on oppo~ite sides of the mold are connected in series by a single conductor as in the alternative of Figure 1. As in ~he Figure 1 alternative the winding sen~e and the connections are ~uch that the turn extents of mold-adjacent sides of oppo~ed coils carry current down on one qide o~ the mold and up on the other at any instant of the. AoC~ energization~ The two divisions shown on one side of a coil are designed for more convenient winding~ The connection of the opposed pairs of coils i in series and the relationship is the same as with the embodiment of Figure 1. With the pairs of coils connec ed in serie~ a 92~
ingle half turn is needed to connect ends of paired coils.
When, in relation to the embodiments of Figures 1-3 or Figures 4 and 5 the term "qingle conductor" iq used referring ~o the connections to or between winding~, thi~ i~
not intended to be limiting. The invention requireq only a single connection to or between windings about the mold~ This sonnection may ~or current carrying capacity or ease o winding be embodied in two or more conductors which together establish the connectionO
Figure 6 shows the same elements as shown in Figures 1 and 2 adapted for three phase operation. Thus the : windings of the al~ernative of Figure 6 have, collectively, the came extent as those shown i~ Figures 1 and 2. However the windings of Figure 6 comprise three pairs, for example -; ~ the each windlng 31 forming part of the phase 1 pair ~: extends along 2/3 of a side as doe~ each winding 33 correspond-ing to ~he phase 3 pair~ The pha~e 2 windings 32 each have adjacent extents 32A and 32 connected about a corner. The windings in a pair are located in opposing positions across the mold and the phases of the windings are cyclically dis-txibuted about the mold. The windings for a phase, connected as indicated in Figure 6A, are wound so that, in the extents b~tween the core and the mold, current runs do~n on one side of the mo~d and up on the other. Thus the portions of the.
winding pair~ inside the core produce 3 ields whose combined effect, with the three phase energization, is to produce a magnetic field across the mold rotating in accord with the three phase energization.
It i~ the o~ject of thi~ application to provide a design for providing a rotating elactromagnetic field for a continuous casting mold which eliminatas the need for pole pieces but also provide3 the vertical turn extents for the desired magnetic field without the necessity of large numbers o~ connecting extent~.
It is an object of the invention to provide electromagnetic stirring apparatus having pairs of windings located on opposite sides of ~he mold corresponding to each phase~ Pairs o~ ~uch windings are provided correspondi~g to each phase and such : windings are cyclically arranged about the mold. By 'cyclically' is meant that, ( ~or example with two phases ) the windings will be arranged PhaJe 1+, Phase 2~, Phase 1- and ~o on about the mold and with three phase~ the winding~ are arranged' Phase 1~, Phase 2~, Phase 3~, Phase 1- a~d ~o on about the mold~
Each of the windings compri~es a plurality of turns wound on a core arranged to have a long extent of a turn on the mold-adjacent and on the mold remote sides of the core, and short connecting extents connecting the long extents which thus alternate in3ide and outside the core. Such a winding provides the plurality of nearly vertical turn extents adjacent the mold.
The combination of ~uch winding having such mold adjacent turn extents carrying current in one 9~ the upward or downward 922~
directions with its counterpart coil o the same phase with its mold adjacent extents carrying curren in the opposite direction to the first, i5 to provide flux acro3~ the mold in a sense determined by the mold adjacent current directions and perpendicular thereto. Coupled with the e~fects of the pairs of coils of other phases there is produced the desired rotating field in the mold which will rotate the molten ~teel being continuously cast therein. A core is provided for each coil. Mag~etic material is preferably provided substanti-ally joinin~ ~he ends o~ the cores of adja~ent coil9 asencountered moving about the mold. With such joining magnetic material there i~ provided a magnetic circuit extending about the mold.
Test~ have indicated that the magnetic field e~fects i=side the mold are at their max~m in the vertical exten~
opposite the core and drop off rapidly at locations àlong the : axis beyond the core~ Accordingly, it is pre~erred that the core shall have the shape of the co~l cross ~ection, having in radial crQSs ~ection relative to the axis of the mold a long dimen~ion axially of t~e mold (~or the approximate ex~ent desired ~or the effective operation of the rotating ~ield) and a shoEt dimen~ion mea~ured in a radial direction.
The long turn extents of each winding on the side of the core remote from the mold do not contribute to the desired field in ~he mold. ~owever due partially to the pre ence of the core ~uch mold-remote extents do not materially detract from ~uch field. It is noted that with such arrange-ment of paixed coils on opposite side~. of the mold, these :~ 16~22~
paired coil~ may be connected in ~erieq to the phase supply, requiring only a ~ingle connection between the one end of a paired coil and one end of the other paired coil. ThU8 the cumbex~ome multiple connections of the apparatu~ ~hown in r~-rur~ 6~~mn~~}~e~ (previously re~erred to) are avoided. (It i~ noted that in apparatus arranged in accord with thi invention, that co~necting the paired coil~ in parallel may further reduce the connec~ion3 between the coils).
However, the serie~ connection between the coils i8 preerred since the u o~ a ~ingle type o~ c~rrent capacity-conductor--ren~ers fabricatiQn si~pler.
In drawing~ which illustrate preferred e~bodiment~
o~ the inve~tio~ :
Figure 1 i5 a horizontal cro~3-section o~ the , i~ventive electromagnetic stirrillg apparatu for a ContinuouR
casting mold, Figuro 2 is a partial vertical cro~s-sectio~ along the line~ 2-2 of Figure 1, ~igure 3 is a schematic indication of the winding connections fo~ a mold, Figuro 4 i~ a plan view o~ a ~orm o~ the electro-magnetic atirring apparatus which i9 an alternative to that YhOwn in ~igure 1, Figuro S i9 a vertical cro~ section along the lines 5 5 of Figure 4, Figure 6 ~chematically indicates the application of th2 in~ention to three phase wiring, Figure 6A shows the three pha~e connectio~ of the windings in Figure 60 1 ~L69?,26 In Figure 1 i9 shown a rectangular continuous casting mola defined by mold wall 10. A cooling pipe xletwork iR provided for cooling the mold along with water inlet and outlet conduit~ 12 and 14. These are not descri}:ed in defail ~ince they are well known and conventional in the confinuous ca~ting axts. As indicated in Figure 2 the mold walls to the left and right o~ the Figure are slightly curved to be concave to the right., Such curvature, . in one o~ the four directions is provided in modern molds to allow the billet direction to be gradually altered from one direction (here vertical) to another (here horizontal). older mols3s have straight wall ~ide~ and both types are within the scope oi~ the invention.
Corresponding to each side of the mold is provided a coil cvmprising a core 15 and a multi-turned windi~g 16 wound thereonO Figure 1 is a horizor~tal section. As Figure ~ indi-cates the winding scgment~ shown on each ~side o the coxe are joined over the top and bottom of the coxe.
Core 15 a~ show~ extends, in plan view, approximately 20 the length of the mold ~ide. It is relatively thin in v~tical cross-~ection~ It is shown as co~tructed of three laminations of suitable magnetic core material ~ivetted together~ However the laminated arra~gement is merely ~or ease o~ rication and the desired dimension~ o~ core 15 of suitable magnetic material may be achieved in any desired way. As indicated, the core 15 is provided with a long dimension in it~s axial direction relative to its thickness and to the axial height of the core. The axial height and axial location of the core 1 ~922~i dP~ines e~ectively the effective axial height of the rotating electromagnetic field in the mold.
As indicated in Figureq 1 and 2 a windi~g iq formed by turns having a long axial dimen~ion extent down one side of the core, a qhort radial transverse extent about the lower edge, a lon~ axial extent up the other side of the core, about the upper e~ge again, down the mold and so on. The core, wound in this way, may be provided with the number o~ layexs and of turns de~ires~. Such a winding is provided with leads 18 and 20 which are coImected, (and the winding i~ wound~ 90 that the ourrent ~lowq in one directio4 (up or down) on one side o the core and in the opposite direction on the other.
The winding~ are paired on opposite sides of~the mold and are connected in ~ierie~ which series connection, together with the : winding direckion,is used to provid~e that the mold-adjacent exte~ts (i.e. the paxt~ of the winding turns between the core and the mold) carry ( at an in~tant in the A . C. energization) current down in the winding on mold-adjaoent long extents on one side o~ ~he mold and c!urrent up in the mold adjacent long extents o~ the paired coil on the other side of the mo}d. Such c:urrentq will produce a field acro~ the mold having its main component tra~sverse to both the mold axis and to the diameter extending b~twe~n the centre of the paired windings. Whe~ the magnetic efects of such paired coil~ are combined with the fi~ld produced by the other two paired coils, and the two pair~ o~ coils are respectively excited by the two phases o~ a two phase relation3hip, a rotating magnetic ~ield i~ produced in the mold which cause~ rotation of that steel in the mold ~ ~92~
which is in it~ liquid state.
Figure 3 repre~ent3 ~chematically the two ~et~ of paired winding~ 16~in relation to input leads and the mold wall 10~ ~hu~ one pair of windings 16 i9 connected in series between the pha~e 1 power input P and neutral connection ~
while the other pair o~ coils 16 i~ connected by two connection 22 in series between tha phase 2 power input Q and the neutral connection ~. It will he noted that, in di~tinctlon from prior art arrangements, that only one connection i~ required between pai~ed ~i~ w~l al~o be noted that there would be no greater number of con~ection~ i~ the pair~d coil3 wer~ connected ia parallel). It will alss be noted that whe~ the two ~at~ of paired coils are enargized with two phase power, with a phase ; a~gl~ o~ 90 between the p~ases, that th~re is created desired rotating electromagnetic field . and having a rotational ~requency equal to the exciting frequency of each pha~e~ ~It is wi~hin -th~ scope of the invention to provicle multiple pair~ of coils per pha~ lically arranged about t~e mold~ As indicated in the schematics o~ Figu~e 3, the ~erie~ connection o the paired opposite windings 16 only require a single conductor 22 between the ~eries connected winding~ which cvnductor 22 ~xtends hal~-way about th~ mold and (i the input lead P, Q and N are both on the same side o~ t~ assembly) a conductor from the non-series connected--end:o~one of the coil~ which i9 remote ~rom the inpu~ lsad~ Pt Q and N round to the side of the i~put lead~.
Thu~ with thi~ invention cumber~ome multiple lead~ are avoided.
A~ explained in the introduction, the oppo~ed paired windings 16 may be con~ected in parallel across the re~a~t phase of the i922~
two phase supply and with such parallel connection no more and possibly less leads are required about the mold.
To complete the magnetic circuit about the mold, which i~ desireable, magnetic core material is provided in the cor~er me~ber~ 24 which are triangular in plan view and extend fcr the approximate height of the core. The me~ ers 24 about the end~ of core members 15 on each side of a respective corner to provide with such core members a substantially continual magnetic circuit about the mold.
Figureq 4 and 5 show an arrangement where the magnetic circuit i3~ in e fect, a unitary core member 28, ormed of magnetic material, extending about the core, although it may be formed of ~eparate connected members i desired. On each of the ~our ~ides of the core, two peripherally designed recease~ 30 are provided for providing that the windi~ga 32 on each side of the mold may be wound in two sections for :
convenienc~ of winding. ~he two ~e~l~ions on each aide of a core are conn~cted in series and the paired windings 32 on oppo~ite sides of the mold are connected in series by a single conductor as in the alternative of Figure 1. As in ~he Figure 1 alternative the winding sen~e and the connections are ~uch that the turn extents of mold-adjacent sides of oppo~ed coils carry current down on one qide o~ the mold and up on the other at any instant of the. AoC~ energization~ The two divisions shown on one side of a coil are designed for more convenient winding~ The connection of the opposed pairs of coils i in series and the relationship is the same as with the embodiment of Figure 1. With the pairs of coils connec ed in serie~ a 92~
ingle half turn is needed to connect ends of paired coils.
When, in relation to the embodiments of Figures 1-3 or Figures 4 and 5 the term "qingle conductor" iq used referring ~o the connections to or between winding~, thi~ i~
not intended to be limiting. The invention requireq only a single connection to or between windings about the mold~ This sonnection may ~or current carrying capacity or ease o winding be embodied in two or more conductors which together establish the connectionO
Figure 6 shows the same elements as shown in Figures 1 and 2 adapted for three phase operation. Thus the : windings of the al~ernative of Figure 6 have, collectively, the came extent as those shown i~ Figures 1 and 2. However the windings of Figure 6 comprise three pairs, for example -; ~ the each windlng 31 forming part of the phase 1 pair ~: extends along 2/3 of a side as doe~ each winding 33 correspond-ing to ~he phase 3 pair~ The pha~e 2 windings 32 each have adjacent extents 32A and 32 connected about a corner. The windings in a pair are located in opposing positions across the mold and the phases of the windings are cyclically dis-txibuted about the mold. The windings for a phase, connected as indicated in Figure 6A, are wound so that, in the extents b~tween the core and the mold, current runs do~n on one side of the mo~d and up on the other. Thus the portions of the.
winding pair~ inside the core produce 3 ields whose combined effect, with the three phase energization, is to produce a magnetic field across the mold rotating in accord with the three phase energization.
Claims (5)
1. Apparatus for causing electromagnetic stirring in a continuous casting mold comprising:
a magnetic circuit formed of magnetic material extending substantially continuously about said mold and spaced therefrom, said magnetic material being so shaped when viewed in a cross section taken radially relative to said mold as to have a long dimension parallel to the axis of said mold and a short dimension radially directed relative to the axis of said mold, at least two pairs of windings, wound on said magnetic material, each winding comprising long dimension extents arranged to carry current in one direction on the inside of the magnetic material and long dimension extents arranged to carry such current in the other direction on the outside of the magnetic material, and short dimension extents generally radially directed relative to the axis of the mold, the windings in each pair being located opposite each other across the axis of said mold whereby they may be energized by the same phase of alternating current to produce in the respective inside extents of such opposed pair of windings simultaneous current in the opposite sense on opposite sides of said mold, the windings of different pairs being cyclically disposed about the mold.
a magnetic circuit formed of magnetic material extending substantially continuously about said mold and spaced therefrom, said magnetic material being so shaped when viewed in a cross section taken radially relative to said mold as to have a long dimension parallel to the axis of said mold and a short dimension radially directed relative to the axis of said mold, at least two pairs of windings, wound on said magnetic material, each winding comprising long dimension extents arranged to carry current in one direction on the inside of the magnetic material and long dimension extents arranged to carry such current in the other direction on the outside of the magnetic material, and short dimension extents generally radially directed relative to the axis of the mold, the windings in each pair being located opposite each other across the axis of said mold whereby they may be energized by the same phase of alternating current to produce in the respective inside extents of such opposed pair of windings simultaneous current in the opposite sense on opposite sides of said mold, the windings of different pairs being cyclically disposed about the mold.
2. Apparatus for causing electromagnetic stirring in a continuous casting mold comprising:
at least one pair of windings for connection to each phase of a multiphase alternating current supply, the windings in each pair being located opposite each other across said mold, windings corresponding to said respective phases being arranged cyclically about said core, each said windings being composed of turns having long dimension extents parallel to the flow axis of said mold and short dimension extents generally radially directed relative to the axis of the mold, said windings being wound on cores of magnetic material.
at least one pair of windings for connection to each phase of a multiphase alternating current supply, the windings in each pair being located opposite each other across said mold, windings corresponding to said respective phases being arranged cyclically about said core, each said windings being composed of turns having long dimension extents parallel to the flow axis of said mold and short dimension extents generally radially directed relative to the axis of the mold, said windings being wound on cores of magnetic material.
3. Apparatus as claimed in Claim 2 wherein said core is shaped when viewed in a cross-section taken radially with respect to the axis of said mold, having a long dimension parallel to such axis and a short dimension extending radially with respect thereto.
4. Apparatus as claimed in Claim 2 wherein magnetic core material is provided extending substantially between the ends of adjacent cores whereby a magnetic circuit formed of said cores and said extending core material extends substantially continuously about said mold.
5. Apparatus as claimed in claim 3 wherein magnetic core material is provided extending substantially between the ends of adjacent cores whereby a magnetic circuit formed of said cores and said extending core material extends substantially continuously about said mold.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US23158981A | 1981-02-05 | 1981-02-05 | |
| US231,589 | 1981-02-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1169226A true CA1169226A (en) | 1984-06-19 |
Family
ID=22869876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000394922A Expired CA1169226A (en) | 1981-02-05 | 1982-01-26 | Apparatus for electromagnetic stirring |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0058048B1 (en) |
| JP (1) | JPS57146457A (en) |
| CA (1) | CA1169226A (en) |
| DE (1) | DE3262243D1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61212456A (en) * | 1985-03-15 | 1986-09-20 | Mitsubishi Heavy Ind Ltd | Electromagnetic stirrer of continuous casting installation |
| JPH0682495U (en) * | 1993-05-11 | 1994-11-25 | 三桜工業株式会社 | Bending synthetic resin tube unit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1064849A (en) * | 1952-10-16 | 1954-05-18 | Improvements to continuous casting molds for metals and in particular steel | |
| US4454909A (en) * | 1980-03-13 | 1984-06-19 | Co-Steel International Limited | Mold stator for electromagnetic stirring |
-
1982
- 1982-01-26 CA CA000394922A patent/CA1169226A/en not_active Expired
- 1982-02-03 DE DE8282300550T patent/DE3262243D1/en not_active Expired
- 1982-02-03 JP JP1504982A patent/JPS57146457A/en active Pending
- 1982-02-03 EP EP82300550A patent/EP0058048B1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57146457A (en) | 1982-09-09 |
| EP0058048B1 (en) | 1985-02-13 |
| EP0058048A1 (en) | 1982-08-18 |
| DE3262243D1 (en) | 1985-03-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |