CA1073978A - Air-cooled high-frequency welding transformer - Google Patents
Air-cooled high-frequency welding transformerInfo
- Publication number
- CA1073978A CA1073978A CA239,036A CA239036A CA1073978A CA 1073978 A CA1073978 A CA 1073978A CA 239036 A CA239036 A CA 239036A CA 1073978 A CA1073978 A CA 1073978A
- Authority
- CA
- Canada
- Prior art keywords
- transformer
- supports
- transformer according
- fan
- core
- 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
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
-
- 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
- H01F30/10—Single-phase transformers
Abstract
ABSTRACT OF THE DISCLOSURE
Each layer of both the primary and the secondary windings of the transformer is wound on radially spaced apart concentric tubular supports, so as to leave an air gap between adjacent windings. A fan is provided for blowing a cooling air stream through said air gaps. By means of this construction it is possible to provide a light weight, high rating transformer for use in power-frequency circuits and to provide for the removal of the heat generated by the power losses of the trans-former, without unduly increasing the weight of the core and the space requirements of the transformer itself.
Each layer of both the primary and the secondary windings of the transformer is wound on radially spaced apart concentric tubular supports, so as to leave an air gap between adjacent windings. A fan is provided for blowing a cooling air stream through said air gaps. By means of this construction it is possible to provide a light weight, high rating transformer for use in power-frequency circuits and to provide for the removal of the heat generated by the power losses of the trans-former, without unduly increasing the weight of the core and the space requirements of the transformer itself.
Description
~073978 BACKGROUND OF THE INVENTION
This invention relates generally to the transformers, and aims to provide a light weight, high rating transformer for use in power-frequency circuits. One of the most important prob-lems related with the construction of the transformers is con-cerned with the removal of the heat generated by the power losses of the transformer, without unduly increasing the weight of the core and the space requirements of the transformer itself. The said problem is even more of importance in the so called high frequency power transformers for use for instance in arc welding or resistance welding equipments.
SUMMARY OF THE INVENTION
In order to avoid the above and other disadvantages of the prior art transformer, it is proposed according to the inven-tion to provide a transformer in which each layer of both the primary and the secondary windings of the transformer is wound on radially spaced apart concentric tubular supports, whicn in turn are mounted on a laminated iron core.
Between adjacent supports, air gaps are left, so as to permit the flow of a cooling air stream.
Advantageously, the said cooling air stream is provided by a fan associated with the transformer.
~ henever used as high frequency transformer, the said transformer may be associated with a suitable inverter, from the output of which the high frequency current is fed to the trans-former. In this latter instance, the inverter may be disposed between the transformer and the fan, in order to provide also for the simultaneous cooling of the inverter.
Further objects and advantages of the invention will become apparent from the following specification made with refer-ence to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings:
Figure 1 is a side view of a transformer assembly accord-ir.g to the invention, particularly suited for use as high fre-quency transformer for welding equipment current, with associated cooling fan and with the interposition between fan and transformer of a block representing an inverter.
Figure 2 is a perspective view of the transformer of Figure 1.
Figure 3 is a cross sectional view of the transformer of Figure 2.
Figure 4 is the electric diagram of the inverter and transformer of Figure 1, and Figure 5 is a cross sectional view through a modified embodiment of the supports for the primary and secondary windings of a transformer according to the invention.
DESCRIPTION OF THE PREFERRED EM~ODIMENT OF THE INVENTION
With reference to Figures 1 to 3, the transformer shown comprises a core 1, composed by a number of core sheets stacked - 20 sheet by sheet to form the desired cross sectional area. The core 1 has two outer legs 2, one middle leg 3 and two yokes 4 connected between the two outer legs 2 and the middle leg 3 at both ends of the core.
Above the outer sheets of the outer legs 2 of the core 1, two pairs of U shaped longitudinal bars 5 are disposed. Each pair of bars 5 are fastened together and to the core 1 by means of bolts 6 which are passed through borings formed through one leg of the bars 5 and through the outer legs 2 of the core. The other legs of the bars 5 are provided with borings in which the sleeves 7 made of electrical insulating material are inserted.
Through the sleeves 7 the bolts 8 are inserted. The bolts 8 projecting from the bottom end of the transformer may be used for ~73978 fastening the transformer to a suitable support (not shown).
To the ends of the bolts 8 projecting from the top end of the transformer two electrical conductive cross bars 9 are secured. To each bar 9 a feed clamp 10 and a connecting link 11 are secured.
The supports 12 which in the example shown are in the number of three are made of electric insulating material, and for instance of ceramics material, and are spaced radially one from another, so as to leave between them, as well as between the innermost support and the middle leg 3, air gaps 17; Radially extending assembling screws 14 are provided, extending through the supports 12 in order to maintain the said supports in the proper angular adjustment.
The said supports are further provided at their ends with notches 13 for accomodation of the inner sides of the yokes 4.
On the outer mantle of the inner supports 12 the pri-mary winding 15 of the transformer is wound, whilst on the outer mantle of the outer support 12 the secondary winding 16 of the transformer is wound. The terminals of the secondary winding 16 are clamped to the clamps 10.
A fan 18 is mounted in front of the supports 12, so as to blow cooling air through the air gaps 17 of the transformer.
Between the fan 18 and the transformer, an inverter circuit 19 is mounted.
As best shown in Figure 4, the said inverter circuit comprises a rectifier 22, the input of which is connected to the AC supply line 20. The output from the rectifier 22 is con-nected through lines 23 and 24 to the input of the solid state inverters 26 and 27. The inverters 26 and 27 may be for instance of the kind manufactured and sold by Texas Instruments under the denomination TIX H 809. 25 is a capacitor connected between '107397~
lines 23 and 24. The outputs from the inverters 26 and 27 are connected together in push-pull through lines 30, 31, the lines 30 and 31 being in turn connected to the input terminals 32 and 33 of the primary winding 17 of the transformer.
The two inverters are controlled by a suitable square vave control frequency supplied through lines 28 and 29 by a suitable source.
From the output of the two inverters 26 and 27 a square vave AC current of the desired frequency is supplied to the input of the transformer.
The operation of the described device will be evident.
Thanks to the feature that the single layers of both the primary and secondary windings of the transformer are wound on separate concentric tubular supports which are radially spaced apart one from another by an air gap, a particularly efficient cooling of the transformer may be achieved, thus increasing the rating of the transformer, whilst decreasing its weight and space require-ments.
Thanks to the above features, the transformer may be used as power transformer for high frequency currents, up to 35,000 Hz.
More particularly, this transformer may be used as power transformer for high frequency welding equipments which must be operated with a high frequency current in the range of 500 to 20,000 Hz, and more particularly in the range from 3000 to 10,000 Hz.
DESCRIPTION OF A MODIFIED EMBODIMENT OF THE INVENTION
With reference to Figure 5, a modified embodiment of the invention is shown. According to this embodiment, the tubu-lar supports 12 for the layers of the primary and secondarywindings of the transformer are made of heat conductive metal, and for instance of alluminium. The said metallic tubular supports are provided with a longitudinal split, in which a rod 34 of electric insulating material, and for instance of plastics, is inserted. The said suppo.r~s are provided on their inner mantle with radially inwardly projecting cooling fins 36, whilst on their outer mantle there is provided a coating 35 of electrically in-sulating material. Spacer means 37 made of electrically insulat-ing material are fitted onto the ridge of some of the fins 36, so as to avoid any contact between adjacent concentric supports 12.
This invention relates generally to the transformers, and aims to provide a light weight, high rating transformer for use in power-frequency circuits. One of the most important prob-lems related with the construction of the transformers is con-cerned with the removal of the heat generated by the power losses of the transformer, without unduly increasing the weight of the core and the space requirements of the transformer itself. The said problem is even more of importance in the so called high frequency power transformers for use for instance in arc welding or resistance welding equipments.
SUMMARY OF THE INVENTION
In order to avoid the above and other disadvantages of the prior art transformer, it is proposed according to the inven-tion to provide a transformer in which each layer of both the primary and the secondary windings of the transformer is wound on radially spaced apart concentric tubular supports, whicn in turn are mounted on a laminated iron core.
Between adjacent supports, air gaps are left, so as to permit the flow of a cooling air stream.
Advantageously, the said cooling air stream is provided by a fan associated with the transformer.
~ henever used as high frequency transformer, the said transformer may be associated with a suitable inverter, from the output of which the high frequency current is fed to the trans-former. In this latter instance, the inverter may be disposed between the transformer and the fan, in order to provide also for the simultaneous cooling of the inverter.
Further objects and advantages of the invention will become apparent from the following specification made with refer-ence to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings:
Figure 1 is a side view of a transformer assembly accord-ir.g to the invention, particularly suited for use as high fre-quency transformer for welding equipment current, with associated cooling fan and with the interposition between fan and transformer of a block representing an inverter.
Figure 2 is a perspective view of the transformer of Figure 1.
Figure 3 is a cross sectional view of the transformer of Figure 2.
Figure 4 is the electric diagram of the inverter and transformer of Figure 1, and Figure 5 is a cross sectional view through a modified embodiment of the supports for the primary and secondary windings of a transformer according to the invention.
DESCRIPTION OF THE PREFERRED EM~ODIMENT OF THE INVENTION
With reference to Figures 1 to 3, the transformer shown comprises a core 1, composed by a number of core sheets stacked - 20 sheet by sheet to form the desired cross sectional area. The core 1 has two outer legs 2, one middle leg 3 and two yokes 4 connected between the two outer legs 2 and the middle leg 3 at both ends of the core.
Above the outer sheets of the outer legs 2 of the core 1, two pairs of U shaped longitudinal bars 5 are disposed. Each pair of bars 5 are fastened together and to the core 1 by means of bolts 6 which are passed through borings formed through one leg of the bars 5 and through the outer legs 2 of the core. The other legs of the bars 5 are provided with borings in which the sleeves 7 made of electrical insulating material are inserted.
Through the sleeves 7 the bolts 8 are inserted. The bolts 8 projecting from the bottom end of the transformer may be used for ~73978 fastening the transformer to a suitable support (not shown).
To the ends of the bolts 8 projecting from the top end of the transformer two electrical conductive cross bars 9 are secured. To each bar 9 a feed clamp 10 and a connecting link 11 are secured.
The supports 12 which in the example shown are in the number of three are made of electric insulating material, and for instance of ceramics material, and are spaced radially one from another, so as to leave between them, as well as between the innermost support and the middle leg 3, air gaps 17; Radially extending assembling screws 14 are provided, extending through the supports 12 in order to maintain the said supports in the proper angular adjustment.
The said supports are further provided at their ends with notches 13 for accomodation of the inner sides of the yokes 4.
On the outer mantle of the inner supports 12 the pri-mary winding 15 of the transformer is wound, whilst on the outer mantle of the outer support 12 the secondary winding 16 of the transformer is wound. The terminals of the secondary winding 16 are clamped to the clamps 10.
A fan 18 is mounted in front of the supports 12, so as to blow cooling air through the air gaps 17 of the transformer.
Between the fan 18 and the transformer, an inverter circuit 19 is mounted.
As best shown in Figure 4, the said inverter circuit comprises a rectifier 22, the input of which is connected to the AC supply line 20. The output from the rectifier 22 is con-nected through lines 23 and 24 to the input of the solid state inverters 26 and 27. The inverters 26 and 27 may be for instance of the kind manufactured and sold by Texas Instruments under the denomination TIX H 809. 25 is a capacitor connected between '107397~
lines 23 and 24. The outputs from the inverters 26 and 27 are connected together in push-pull through lines 30, 31, the lines 30 and 31 being in turn connected to the input terminals 32 and 33 of the primary winding 17 of the transformer.
The two inverters are controlled by a suitable square vave control frequency supplied through lines 28 and 29 by a suitable source.
From the output of the two inverters 26 and 27 a square vave AC current of the desired frequency is supplied to the input of the transformer.
The operation of the described device will be evident.
Thanks to the feature that the single layers of both the primary and secondary windings of the transformer are wound on separate concentric tubular supports which are radially spaced apart one from another by an air gap, a particularly efficient cooling of the transformer may be achieved, thus increasing the rating of the transformer, whilst decreasing its weight and space require-ments.
Thanks to the above features, the transformer may be used as power transformer for high frequency currents, up to 35,000 Hz.
More particularly, this transformer may be used as power transformer for high frequency welding equipments which must be operated with a high frequency current in the range of 500 to 20,000 Hz, and more particularly in the range from 3000 to 10,000 Hz.
DESCRIPTION OF A MODIFIED EMBODIMENT OF THE INVENTION
With reference to Figure 5, a modified embodiment of the invention is shown. According to this embodiment, the tubu-lar supports 12 for the layers of the primary and secondarywindings of the transformer are made of heat conductive metal, and for instance of alluminium. The said metallic tubular supports are provided with a longitudinal split, in which a rod 34 of electric insulating material, and for instance of plastics, is inserted. The said suppo.r~s are provided on their inner mantle with radially inwardly projecting cooling fins 36, whilst on their outer mantle there is provided a coating 35 of electrically in-sulating material. Spacer means 37 made of electrically insulat-ing material are fitted onto the ridge of some of the fins 36, so as to avoid any contact between adjacent concentric supports 12.
Claims (10)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A transformer comprising a primary winding and a secondary winding supported on a laminated iron core, in which each layer of both the primary and the secondary winding is wound on radially spaced apart concentric tubular supports.
2. A transformer according to claim 1, in which the said tubular supports have a circular cross section.
3. A transformer according to claim 1 in which the said tubular supports are made of electrically insulating ceramic material.
4. A transformer according to claim 1, in which the said supports are made of heat conductive metal and are provided with a longitudinal split.
5. A transformer according to claim 4, in which in said split an electrically insulating bar is inserted.
6. A transformer according to claim 4, in which the said supports are provided on their inner surface with radially in-wardly extending fins.
7. A transformer according to claim 4 in which the said supports are provided on their outer surface with an elec-trically insulting coating.
8. A transformer according to claim 1 in which the said supports are provided at their ends with notches for the accomodation of the edge portion of the core yokes.
9. A transformer according to claim 1, further com-prising in combination a fan disposed coaxially to the said tubular supports.
10. A transformer for high frequency welding plants comprising in combination a laminated iron core, a plurality of concentric tubular supports supported on the said core, with the adjacent supports radially spaced apart so as to leave air gaps between one support and the adjacent ones, a single layer winding wound on each support, a solid state inverter circuit having its input terminals connected to an AC current feed line and its out-put connected to the input terminals of one of the said windings of the transformer constituting the primary winding of the trans-former, and a fan for blowing cooling air through the air gaps between the said supports of the transformer, the said inverter circuit being disposed between said fan and said transformer in a position in which it can be cooled by the air stream from said fan.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT13040/74A IT1023916B (en) | 1974-11-11 | 1974-11-11 | POWER SUPPLY DEVICE, STAT REDUCER, CO WITH INVERTER AND FORCED VENTILATION, ESPECIALLY SUITABLE FOR HIGH FREQUEIZA ACCHE ELECTRIC WELDING |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1073978A true CA1073978A (en) | 1980-03-18 |
Family
ID=11144100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA239,036A Expired CA1073978A (en) | 1974-11-11 | 1975-11-05 | Air-cooled high-frequency welding transformer |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS5170414A (en) |
| CA (1) | CA1073978A (en) |
| CH (1) | CH603002A5 (en) |
| DE (1) | DE2549327A1 (en) |
| ES (1) | ES442494A1 (en) |
| FR (1) | FR2290750A1 (en) |
| IT (1) | IT1023916B (en) |
| SE (1) | SE7512527L (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0043615A1 (en) * | 1980-07-03 | 1982-01-13 | Koninklijke Philips Electronics N.V. | High-voltage transformer |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2802300C2 (en) * | 1978-01-20 | 1985-05-15 | I.P.F. Gesellschaft für Verwertung von Patenten mbH, 8000 München | Cooling device for transformers |
| IT8421970V0 (en) * | 1984-05-31 | 1984-05-31 | Siev Soc Ind Elett Mecc Veneta | TRANSFORMATORY DEVICE FOR ELECTRIC WELDING. |
| DE3708804A1 (en) * | 1987-03-18 | 1987-10-22 | Josef Schmitz | Transformer |
| JPH10214736A (en) * | 1997-01-28 | 1998-08-11 | Toyo Denso Co Ltd | High voltage generating transformer |
| DE29705789U1 (en) | 1997-04-02 | 1997-06-05 | Expert Maschbau | transformer |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE593732C (en) * | 1931-02-25 | 1934-03-02 | Siemens Schuckertwerke Akt Ges | Device for heat dissipation from the active parts of transformers with tube winding |
| DE909122C (en) * | 1950-03-07 | 1954-04-15 | Gerhard Apelt Dipl Ing | Dry type transformer |
| FR1133707A (en) * | 1955-10-15 | 1957-04-01 | Comp Generale Electricite | Layer Consolidated Windings High Voltage Power Transformer |
| US3551863A (en) * | 1968-03-18 | 1970-12-29 | Louis L Marton | Transformer with heat dissipator |
| CA906072A (en) * | 1968-04-11 | 1972-07-25 | B. Trench Anthony | A.c. magnetically streamlined heat sink |
-
1974
- 1974-11-11 IT IT13040/74A patent/IT1023916B/en active
-
1975
- 1975-11-04 DE DE19752549327 patent/DE2549327A1/en not_active Ceased
- 1975-11-05 CA CA239,036A patent/CA1073978A/en not_active Expired
- 1975-11-07 FR FR7534740A patent/FR2290750A1/en active Granted
- 1975-11-07 SE SE7512527A patent/SE7512527L/en unknown
- 1975-11-10 JP JP50134200A patent/JPS5170414A/ja active Pending
- 1975-11-10 ES ES442494A patent/ES442494A1/en not_active Expired
- 1975-11-11 CH CH1459775A patent/CH603002A5/xx not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0043615A1 (en) * | 1980-07-03 | 1982-01-13 | Koninklijke Philips Electronics N.V. | High-voltage transformer |
Also Published As
| Publication number | Publication date |
|---|---|
| CH603002A5 (en) | 1978-08-15 |
| IT1023916B (en) | 1978-05-30 |
| SE7512527L (en) | 1976-05-12 |
| JPS5170414A (en) | 1976-06-18 |
| DE2549327A1 (en) | 1976-05-13 |
| ES442494A1 (en) | 1977-05-16 |
| FR2290750B1 (en) | 1979-07-20 |
| FR2290750A1 (en) | 1976-06-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |