US1721073A - High-frequency induction furnace - Google Patents
High-frequency induction furnace Download PDFInfo
- Publication number
- US1721073A US1721073A US225620A US22562027A US1721073A US 1721073 A US1721073 A US 1721073A US 225620 A US225620 A US 225620A US 22562027 A US22562027 A US 22562027A US 1721073 A US1721073 A US 1721073A
- Authority
- US
- United States
- Prior art keywords
- coil
- bands
- conductor
- band
- furnace
- 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 - Lifetime
Links
- 230000006698 induction Effects 0.000 title description 5
- 239000004020 conductor Substances 0.000 description 31
- 238000004804 winding Methods 0.000 description 16
- 239000010410 layer Substances 0.000 description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 230000002500 effect on skin Effects 0.000 description 4
- 238000003475 lamination Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000002356 single layer 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
- H05B6/36—Coil arrangements
- H05B6/40—Establishing desired heat distribution, e.g. to heat particular parts of workpieces
-
- 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
- H05B6/362—Coil arrangements with flat coil conductors
Definitions
- This invention relates to primary windings for high frequency induction furnaces.
- Such windings have heretofore been mad of watercooled copper'tubes or even of comp. ratively thick copper bands.
- the influence of the skin effect is highly detrimental, the currents on the inside of the conductor becoming crowded together so that the major part of the cross sectional area of the'conductor is not used for carrying the current, and the efliciency factor of the furnace is lowered.
- the conductivity say of the iron to raise such factor above 70%. It would be still ower if instead of a single layer of windings several such layers were employed.
- the thickness of the several bands being so proportioned that the influence of the skin effect 1s no longer noticeable and the cross sectional area is completely utilized for conducting the current, and the several windings being so arranged and shaped as to be alike in respect of resistance, impedance and inductive action on the interior of the furnace.
- Fi 1 is a vertical section of a crucible with one orm of my improved primary winding coiled around it;
- Figs. 2, 3 and 4 are diagrammatic views showing in development and on a smaller scale than Fig. 1, three different forms of coils or winding embodying the invention, the coil shown in Fig. 4: corrcsp0nding to that shown in Fig. 1;
- Fig. 5 is a detail perspective view of a portion of a coil made in accordance with Fig. 2;
- Fig. 6 is a vertical section of a crucible with another form of my improved coil; and
- Fig. 7 is a diagrammatic developed view illustrating de- 4 tails of the coil shown in Fig. 6.
- Figure 1 shows in vertical section a crucible t, around which a conductor of the novel type is helically coiled.
- This conductor may, consist of two three or four layers of thin copper strips.
- Figs. 2, 3 and 4 are diagrammatic plan views or developed views representing coils or windings embodying two, three, and four layers respectively, and showing the conductors or strips composing said coils, in the condition in which they appear before the are formed into coils.
- the winding or coil shown in Fig. 1 is represented as having four lar furnace. The thickness is proportion a,
- bands or strips are connected 1n parallel, their ends or terminals 2,, 2, being connected to the source of eurrent.
- Said bands or strips are insulated fromeach other throughout their length as by a coating of enamel for example. By arranging suitable distance pieces between them, air insulation may be provided for. Finally strips of insulating material are placed between the bands or strips.
- the bands are crossed at one or more points in such a way that each of them will be similar to the others and will have portions in different positions at different parts of its length.
- a crossing point 6 is provided forthe bands (1 and b and each of them lies for one half of its length on the inside and for the other half of its length on the outside
- conductors a, b, c areprovided which are crossed at two points .9, in such a way that each conductor has one-third of 'its length on the inside, one-third in the middle and one-thirdon the outside of the entire conductor or coil.
- FIG 5 is shown in perspective a con structional example for the crossing 8 shown in Figure 2.
- the conductor band I) is turned vertically upwards on a line is lying at an angle of degrees.
- the connection member 0 thus formed is again turned downwards in a curved form and again turned over obliquely so that the conductor portion 12 runs on at the same level with b but in a plane parallel thereto.
- the band a which is connected by a member '0 to a band portion a lying in front of the part b of the conductor.
- three or four connecting members respectively are required.
- Figures 6 and 7 is shown another constructional example in which the several conductors are connected in series
- Figure 6 shows a crucible-like hearth '25 around which band-shaped conductors are wound in three turnsor rings I, II, III of three layers e, f, g each.
- the several turns of the bands are indicated between the supply terminals 2 2 as shown in Figure 6, and are connected in series in suchv a way that the current flows through in the uppermost ring I in the outer conductor e, while in the next ring II the current flows in the middle conductor f and in the third ring III in the inner conductor g. From this latter the current then passes into the inner conductor f and so on until it finally leaves the outer layer 00f the winding in the lower winding III through the terminal .2
- connection of the individual windings are shown separately on a larger scale. These are produced by doubly bending over the conductor bands which at the cross-over points u consequently pass from one ring to another and also from one plane to another, while only one transfer to another layer of windings takes place at the connecting points '0 at the outer sides of. the uppermost and lowermost rings I and III respectively.
- the arrangements shown enable the efliciency factor of the high frequency furnace to be increased to about 90 to 95 per cent.
- the arrangement can also be adapted with the same efficiency for crucibles which are not exactly cylindncal, provided the ohmic resistance and impedance and also the inductive action on the interior of the furnace be equal all over.
- a high frequency furnace comprising a crucible and a primary coil inductively associated therewith, said coil comprising a plurality of thin bands of conducting material set on edge, insulated from each other and arranged to form a laminated structure, the width and thickness of each band being so proportioned relatively to the strength and frequency, respectively, of the current that objectionable skin effects will be minimized and the full cross sectional area of the conductors of the coil will be substantially completely utilized.
- a high frequency furnace comprising a crucible and a laminated primary coil inductively associated therewith, each conducting lamination of said coil consisting of a plurality of substantially equal lengths of a plurality of thin bands of conducting material,
- a high frequency furnace comprising a crucible and a primary coil inductively associated therewith, said .coil consistin of a plurality of thin conducting insulated ands set on edge and arranged to form a laminated coil structure in which each lamination of the coil consists of ,a plurality of substantially equal lengths of each of said bands.
- a high frequency furnace comprising a crucible and a primary coil inductively associated therewith, said coil consisting of a' plurality of insulated thin bands of conducting material set on edge, connected in parallel and forming a laminated structure, each band consisting of a plurality of serially connected portions, each arranged at a different distance from the axis of the coil than its adjacent portions, and so that each band will have a substanti ally equal length thereof arranged at the same distance from the axis of the coil band will have substantially the same electrical efiect on the interior of the furnace.
- a high frequency furnace comprising a crucible and a primary coil inductively associated therewith said coil consisting of a plurality 'of insulated thin bands of conducting material set on edge and connected at their ends in parallel, each band consisting of a plurality of portions arranged in step-like formation at difierent radial distances from the axis of the coil, each of such portions of each band being substantially in line with a pair of adjacent portions of adjacent bands, and the adjacent portions of each band being connectedin series by cross over sections to avoid contacting engagement between adjacent bands.
- a high frequency furnace comprising a crucible and a primary coil inductively associated therewith, said coil consisting of a plurality of continuous thin bands of conducting material set on edge and connected at their ends in parallel and being insulated from each other throughout their length, each bandconsisting of a plurality of portions ar-' ranged in step-like formation at diflI'erent radial distances from the axis of the coil, and
- each band being so arranged relatively to the portions of the other lamlnations that the coil consists of a plurality of laminated helical turns, in which each lamination consists of a plurality of portions of different bands.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Induction Heating (AREA)
- Crucibles And Fluidized-Bed Furnaces (AREA)
- Furnace Details (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Blast Furnaces (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES80158D DE507556C (de) | 1927-06-11 | 1927-06-11 | Hochfrequenz-Induktionsofen |
DE609460T | 1930-03-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
US1721073A true US1721073A (en) | 1929-07-16 |
Family
ID=33565841
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US225620A Expired - Lifetime US1721073A (en) | 1927-06-11 | 1927-10-12 | High-frequency induction furnace |
US520503A Expired - Lifetime US1924680A (en) | 1927-06-11 | 1931-03-06 | Coil for induction furnaces |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US520503A Expired - Lifetime US1924680A (en) | 1927-06-11 | 1931-03-06 | Coil for induction furnaces |
Country Status (6)
Country | Link |
---|---|
US (2) | US1721073A (fr) |
AT (2) | AT119737B (fr) |
CH (1) | CH131920A (fr) |
DE (2) | DE507556C (fr) |
FR (2) | FR642577A (fr) |
GB (2) | GB291774A (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4969158A (en) * | 1986-02-12 | 1990-11-06 | Asea Brown Boveri | Inductive heating unit |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE970468C (de) * | 1950-09-29 | 1958-09-25 | Siemens Ag | Gluehspule zum induktiven Erwaermen eines Werkstueckes |
US2676234A (en) * | 1951-01-12 | 1954-04-20 | Magnethermic Corp | Induction furnace |
DE1049007B (de) * | 1954-11-16 | 1959-01-22 | Oerlikon Maschf | Magnetwicklung |
NL296248A (fr) * | 1962-08-09 | |||
FR2693072B1 (fr) * | 1992-06-24 | 1994-09-02 | Celes | Perfectionnements apportés aux bobines de système de chauffage par induction. |
-
1927
- 1927-06-11 DE DES80158D patent/DE507556C/de not_active Expired
- 1927-09-26 CH CH131920D patent/CH131920A/de unknown
- 1927-09-27 GB GB25502/27A patent/GB291774A/en not_active Expired
- 1927-10-12 US US225620A patent/US1721073A/en not_active Expired - Lifetime
- 1927-10-19 FR FR642577D patent/FR642577A/fr not_active Expired
-
1928
- 1928-06-09 AT AT119737D patent/AT119737B/de active
-
1930
- 1930-03-21 DE DE1930609460D patent/DE609460C/de not_active Expired
-
1931
- 1931-02-13 GB GB4640/31A patent/GB359343A/en not_active Expired
- 1931-03-06 US US520503A patent/US1924680A/en not_active Expired - Lifetime
- 1931-03-09 FR FR712915D patent/FR712915A/fr not_active Expired
- 1931-03-18 AT AT138733D patent/AT138733B/de active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4969158A (en) * | 1986-02-12 | 1990-11-06 | Asea Brown Boveri | Inductive heating unit |
Also Published As
Publication number | Publication date |
---|---|
DE609460C (de) | 1935-02-15 |
DE507556C (de) | 1930-09-18 |
US1924680A (en) | 1933-08-29 |
AT138733B (de) | 1934-09-10 |
CH131920A (de) | 1929-03-15 |
GB291774A (en) | 1928-11-29 |
FR712915A (fr) | 1931-10-15 |
FR642577A (fr) | 1928-08-31 |
AT119737B (de) | 1930-11-10 |
GB359343A (en) | 1931-10-22 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3528046A (en) | Interlaced disk winding with improved impulse voltage gradient | |
US3467931A (en) | Continuous disk winding and integral radial coil connector for electric transformer and the like | |
US3392326A (en) | Coil winding buffer conductors having impedance means | |
GB991271A (en) | Improvements in windings for inductive apparatus | |
US2344294A (en) | Electromagnetic induction apparatus | |
US1721073A (en) | High-frequency induction furnace | |
US3327266A (en) | High voltage winding for electric transformers | |
US2310684A (en) | Inductive winding | |
US3246270A (en) | Graded insulation for interleaved windings | |
US2391229A (en) | Electric induction apparatus | |
US3201734A (en) | Transformer core and winding | |
US3195088A (en) | High current winding for electrical inductive apparatus | |
US3419835A (en) | Electrical winding structures | |
JP2567069B2 (ja) | 多重円筒巻線 | |
US4135173A (en) | Low volume sheet-wound transformer coils with uniform temperature distribution | |
US1386828A (en) | Windings for electrical apparatus | |
US3353129A (en) | High voltage electric induction apparatus | |
US2719275A (en) | Combination choke and transformer | |
US3185946A (en) | Transformer tap winding | |
US3766504A (en) | Interleaved transformer winding having three parallel connected conductors | |
US3925743A (en) | Interleaved winding for electrical inductive apparatus | |
US1552686A (en) | Electric resistance coils free from induction and capacity | |
US1741200A (en) | Transformer | |
US3688236A (en) | Electrical inductive apparatus having serially interconnected windings | |
US1834445A (en) | Inductor coil |