EP0170417A1 - Wanderwellen-Induktionsheizgerät - Google Patents
Wanderwellen-Induktionsheizgerät Download PDFInfo
- Publication number
- EP0170417A1 EP0170417A1 EP85304651A EP85304651A EP0170417A1 EP 0170417 A1 EP0170417 A1 EP 0170417A1 EP 85304651 A EP85304651 A EP 85304651A EP 85304651 A EP85304651 A EP 85304651A EP 0170417 A1 EP0170417 A1 EP 0170417A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- windings
- heater
- travelling
- primary
- heater according
- 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.)
- Granted
Links
- 230000006698 induction Effects 0.000 title claims abstract description 10
- 238000004804 winding Methods 0.000 claims abstract description 40
- 230000005291 magnetic effect Effects 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 230000000295 complement effect Effects 0.000 claims description 4
- 239000004411 aluminium Substances 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 229910001369 Brass Inorganic materials 0.000 claims description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 2
- 239000010951 brass Substances 0.000 claims description 2
- 239000011701 zinc Substances 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 229910052742 iron Inorganic materials 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000001815 facial effect Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
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
-
- 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
- H05B6/36—Coil arrangements
- H05B6/44—Coil arrangements having more than one coil or coil segment
Definitions
- This invention relates to a travelling wave induction heater comprising a plurality of primary windings and associated core means, and means to connect successive windings to successive phases of a multi-phase electric supply to provide the primary of the travelling wave induction heater, whereby, in use, a travelling magnetic field is produced and there being an electrically conductive member, in which eddy currents are induced by the magnetic field, and which acts as a secondary of the heater and is thereby heated.
- a heater is referred to hereinafter as being of the kind specified.
- the heating of the secondary may not be uniform for a uniform primary winding distribution and an object of the invention is to overcome this problem.
- this problem is overcome by providing a heater of the kind specified in which the primary windings are arranged in a plurality of sets, there being means to connect successive windings of each set to successive phases of a multi-phase electric supply whereby each set produces a travelling magnetic field.
- the travelling magnetic field produced by one set travels in a direction which is different to the direction of travel of the travelling magnetic field produced by the, or at least one of, the other sets of windings.
- the travelling waves produced in each quadrant may travel in directions inclined at 90° to each other so that the angle between the direction of travel in adjacent quadrants add algebraically to 360 0 .
- the travelling wave produced in two adjacent quadrants may travel in parallel directions whilst the travelling wave in the other two quadrants may also travel in parallel directions but opposite to the direction of travel of the waves in the first mentioned quadrants.
- the sets may be arranged in a square configuration and the sets may themselves each be square, in which case a corner of each set meet at the centre of the square.
- the sets may be rectangular and disposed so as to provide a square or rectangular opening at the centre of the square heater.
- the sets may also be of a corresponding but smaller rectangular configuration.
- the core means of each set may be discrete and separate from the core means of each other set.
- the core means of each set may comprise a part of a common core having pole pieces of appropriate orientation to provide the above mentioned direction of travel for the travelling wave produced by each set.
- the secondary is preferably a single secondary member of a shape complementary to the shape of the primary.
- the secondary may comprise a plurality of discrete and separate secondary members each of a configuration complementary to the configuration of an associated set of primary windings and core means.
- the secondary may have a non-uniform electrical conductivity, the distribution of electrical conductivity being such as to provide a desired distribution of heating in the secondary.
- the secondary may comprise at least part of a workpiece to be heated.
- the secondary may comprise a heating member which, in use, heats a workpiece by heat transfer.
- the secondary may comprise a component of a relatively high electrical conductivity material such as copper or aluminium or zinc or brass, having at least one opening therein and/or area of lower conductivity and/or area of different thickness.
- the secondary may comprise a single element or be fabricated from a plurality of elements.
- the secondary may also comprise an element of ferro magnetic material such as cast iron, soft iron or steel.
- the secondary may be formed separately from the remainder of the secondary and may be secured thereto.
- it may comprise a coating applied to the remainder of the secondary, for example by spraying.
- the component may comprise the whole of the secondary, particularly where the secondary comprises said heating member.
- the secondary comprises a mould of a moulding apparatus.
- the mould may be positioned between a pair of relatively movable press members for the application of pressure to the mould.
- a travelling wave induction heater embodying the invention comprises a primary core made up of four discrete and separate core members PI-P4 arranged as shown in Figure I so as to produce a heater of square overall configuration with a central square aperture A.
- each core member P 1 -P 4 comprises a plurality of iron laminations 10 which may be insulated to reduce eddy current effects and are clamped together by nut and bolt fasteners 11 to provide a series of adjacent teeth 12 having coplanar pole faces 13.
- the teeth 12 are insulated in conventional manner and copper wire windings W are formed around the teeth with successive windings being connected to successive phases of a multi-phase supply in conventional manner to produce a travelling wave.
- the multi-phase supply is three phase.
- the supply may be of other than three phase, although three phase supply is preferred as it is readily commercially available.
- the winding may be any other pattern that produces a travelling field.
- windings W are shown around one tooth only for clarity. This it also the case in Figures 3, 4 and 4a.
- the thus formed primary member is then embedded in epoxy resin (not shown) in conventional manner and a terminal box (not shown) is provided for connection to the multi-phase supply.
- the thus formed primary members are then assembled together and electrical connection to the multi-phase supply established so that the separate travelling wave produced by each set of windings associated with a core member P 1 -P 4 travels in the direction indicated by the arrows R I -R 4 shown in Figure I.
- the windings of the sets being connected in parallel, although they may be connected in series if desired.
- a secondary (not shown) comprising a sheet of copper of the same overall square configuration as the primary P is positioned over the pole faces 13 in conventional manner. If desired, the secondary may be provided with an opening above the aperture A in the primary to permit of, for example, accommodation of an injection nozzle where the heater is used in a plastics moulding apparatus, or, of course, for any other desired purpose.
- the sets of primary windings and associated pole members P 1 -P 4 are arranged in the pattern described so that the hotter end of one unit is adjacent to the colder end of another unit, thereby achieving a more uniform heating of the secondary.
- the core members P 1 -P 4 may be of square configuration provided with associated sets of primary windings and disposed as shown in Figure 3 to produce again a heater of square overall configuration but without a central aperture, and again with the hotter end of one set of primary windings being adjacent to the colder end of another.
- the heater is of rectangular overall configuration, in which case the pole members P I -P 4 are of corresponding but smaller rectangular configuration and may be arranged to produce travelling waves as indicated by the arrows Rl-R4, or alternatively as shown in Figure 4a by the arrows Rl-R4.
- heaters of square or rectangular overall configuration have been described and made up of four sets of primary windings and associated core members, if desired, the heater may be of different overall configuration and/or may be made up of a different number of sets of primary windings and associated pole members.
- the present invention envisages any number of sets of primary windings and associated pole members from two upwards and envisages disposing of the primary windings and associated pole members in any desired configuration to achieve a desired pattern of travelling wave direction to achieve a desired heating effect.
- the windings associated with the cores are connected in parallel but may be connected in series if desired.
- the primary members have been described as being made as discrete and separate components, if desired they may be made as a single core member with different parts of the core member being formed to produce pole faces 13 having an orientation as shown in the figures, and of course in non-illustrated embodiments mentioned above, again the sets of primary windings from two upwards may be provided in association with core members which are not formed as separate and discrete members but as parts of a single member formed to appropriate configuration, and the windings of the sets connected in parallel or in series.
- the secondary may be made of a number of secondary members which may be of the same shape, in plan view, as the parts of the core means associated with each set of windings or may be made from separate members of different configuration.
- the secondary may be provided with regions of different electrical conductivity, for example, and as illustrated in Figure 5, a workpiece to be heated such as a block of steel is indicated at 20 and a sheet of copper is secured to the undersurface of the block 20 as indicated at 21 so as to be disposed between the block 20 and the primary.
- a workpiece to be heated such as a block of steel is indicated at 20 and a sheet of copper is secured to the undersurface of the block 20 as indicated at 21 so as to be disposed between the block 20 and the primary.
- the sheet 21 has a series of rectangular openings 22 formed therein, the longer axes of which extend at right angles to the direction of motion of the field. In Figure 2 only a small number of openings is shown for clarity. It is found in practice, that by providing the sheet 21 with the openings 22 therein, that the heating of the block 20 is more uniform.
- the sheet 21 could be of composite construction comprising a relatively high conductivity copper in a region corresponding to the unapertured parts of the plate 21 and a material of lesser conductivity, such as iron, in a region corresponding to the apertures 22.
- the plate 21 could be of different thickness in regions corresponding to the unapertured parts of the plate 21 and the aperiured parts of the plate 21 to achieve the desired variation in condility.
- FIG. 6 Another embodiment is shown in Figure 6 in which the primary P is as described above.
- the secondary is formed in two portions 24 and 25 in facial contact, the portion 25 having a relatively high resistivity such as iron or steel as described above, and the portion 24 having a relatively low resistivity such as copper, aluminium etc. as described above, and being positioned between the portion 24 and the primary.
- Grooves 26 extending at right angles to the direction of motion of the field are formed in the portion 24 between longitudinal edges of the portion 24 which are provided with copper or other low resistivity areas 27 which extend in the direction of motion of the field.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Induction Heating (AREA)
- Cookers (AREA)
- Soft Magnetic Materials (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT85304651T ATE52403T1 (de) | 1984-06-28 | 1985-06-28 | Wanderwellen-induktionsheizgeraet. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8416486 | 1984-06-28 | ||
| GB848416486A GB8416486D0 (en) | 1984-06-28 | 1984-06-28 | Induction heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0170417A1 true EP0170417A1 (de) | 1986-02-05 |
| EP0170417B1 EP0170417B1 (de) | 1990-05-02 |
Family
ID=10563116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP85304651A Expired - Lifetime EP0170417B1 (de) | 1984-06-28 | 1985-06-28 | Wanderwellen-Induktionsheizgerät |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0170417B1 (de) |
| AT (1) | ATE52403T1 (de) |
| DE (1) | DE3577508D1 (de) |
| GB (2) | GB8416486D0 (de) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1202900A (fr) * | 1957-03-05 | 1960-01-14 | Penn Induction Corp | Procédé et appareil pour le chauffage par induction de bandes de tôle |
| DE1908850A1 (de) * | 1969-02-21 | 1970-09-10 | Sawyer Bruce Alden | Magnetische Positionierungsvorrichtung |
| DE1788154A1 (de) * | 1967-07-10 | 1974-08-29 | Xynetics Inc | Einrichtung zum einstellen der realtivbewegung von zwei gliedern |
| FR2495750A1 (fr) * | 1980-12-10 | 1982-06-11 | Siderurgie Fse Inst Rech | Four continu pour le chauffage inductif de produits electroconducteurs solides |
| EP0087345A1 (de) * | 1982-02-18 | 1983-08-31 | Alsthom | Verfahren und Vorrichtungen zum Verkleinern der induzierten Leistung in einem platten leitenden elektromagnetisch ohne Berührung aufgehängten Produkt |
| EP0135025A1 (de) * | 1983-07-21 | 1985-03-27 | Force Engineering Limited | Wanderwellen-Induktionsheizapparat |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4321444A (en) * | 1975-03-04 | 1982-03-23 | Davies Evan J | Induction heating apparatus |
| FR2339316A1 (fr) * | 1976-01-21 | 1977-08-19 | Siderurgie Fse Inst Rech | Four de rechauffage a induction a champ glissant |
| GB2111360A (en) * | 1981-12-11 | 1983-06-29 | Nat Res Dev | Induction heating apparatus |
-
1984
- 1984-06-28 GB GB848416486A patent/GB8416486D0/en active Pending
-
1985
- 1985-06-27 GB GB08516311A patent/GB2161350B/en not_active Expired
- 1985-06-28 DE DE8585304651T patent/DE3577508D1/de not_active Expired - Fee Related
- 1985-06-28 AT AT85304651T patent/ATE52403T1/de not_active IP Right Cessation
- 1985-06-28 EP EP85304651A patent/EP0170417B1/de not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1202900A (fr) * | 1957-03-05 | 1960-01-14 | Penn Induction Corp | Procédé et appareil pour le chauffage par induction de bandes de tôle |
| DE1788154A1 (de) * | 1967-07-10 | 1974-08-29 | Xynetics Inc | Einrichtung zum einstellen der realtivbewegung von zwei gliedern |
| DE1908850A1 (de) * | 1969-02-21 | 1970-09-10 | Sawyer Bruce Alden | Magnetische Positionierungsvorrichtung |
| FR2495750A1 (fr) * | 1980-12-10 | 1982-06-11 | Siderurgie Fse Inst Rech | Four continu pour le chauffage inductif de produits electroconducteurs solides |
| EP0087345A1 (de) * | 1982-02-18 | 1983-08-31 | Alsthom | Verfahren und Vorrichtungen zum Verkleinern der induzierten Leistung in einem platten leitenden elektromagnetisch ohne Berührung aufgehängten Produkt |
| EP0135025A1 (de) * | 1983-07-21 | 1985-03-27 | Force Engineering Limited | Wanderwellen-Induktionsheizapparat |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8516311D0 (en) | 1985-07-31 |
| EP0170417B1 (de) | 1990-05-02 |
| ATE52403T1 (de) | 1990-05-15 |
| DE3577508D1 (de) | 1990-06-07 |
| GB2161350B (en) | 1987-02-25 |
| GB2161350A (en) | 1986-01-08 |
| GB8416486D0 (en) | 1984-08-01 |
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