KR100403922B1 - Inverter Type Resistance Welding Machine Transformer - Google Patents

Abstract

In an inverter resistance welding machine transformer, a secondary side transformer structure having a small number of parts, a simple assembly process, and a small secondary side inductance is obtained.

From the rectifying element mounting surface 30b of the heat dissipation member 30, the secondary coil members 22 and 24 are arranged in one transverse hand (right hand) and at the same time, the transverse hand in the other direction ( The first and second transformer output terminals 14A, 14B are arranged in the left hand), and the first external connection member 64 protrudes from one end of the cathode common connecting plate 48 so that the first transformer output is performed. It extends to the terminal 14A and from the 3rd protrusion-shaped connection part 38c of the center tab member 38 which exists in the horizontal hand (right hand) of one side of the heat radiating member 30. The second external connection member 68 extends to the second trans output terminal 14B of the other transverse hand of the heat dissipation member 30 via the front face of the rectifying element mounting surface 30b.

Description

Inverter Type Resistance Welding Machine Transformer

The present invention relates to a welding transformer with a rectifying element for use in an inverter type resistance welding machine.

8 shows the circuit configuration of the main part of the inverter resistance welding machine. In the welding transformer (inverter resistance welding machine transformer) 100, the primary coil 102 and the secondary coil 104 are wound around the core 106. On the primary side, both terminals of the primary coil 102 are directly connected to a pair of transformer input terminals 108A and 108B. On the secondary side, both terminals of the secondary coil 106 are connected to one output terminal 114A through rectifying elements 110 and 112, respectively, and the center tap 118 of the coil 106 is connected to the other output terminal. It is connected to 114B.

A DC power obtained by rectifying an AC voltage of a commercial frequency by a rectifier circuit (not shown) is input to an input terminal of the inverter 116. The inverter 116 consists of a switching element, for example, a giant transistor, and converts the input direct current into a high frequency alternating current in the form of a pulse (single wave) by a high frequency switching operation. The switching operation of this inverter 116 is controlled by the control signal from the control circuit 118.

The high frequency alternating current output from the inverter 116 is applied to the primary coil 102 of the transformer 100, and the high frequency alternating current of the large current which is stepped down is obtained in the secondary coil 104 of the transformer 100. The high-frequency alternating current generated in the secondary coil 104 is rectified alternately by the diodes 110 and 112 every half cycle, so that the 114 A side is the anode and the 114 B side is the cathode for the transformer output terminals 114A and 114B. Is obtained. Thereby, the secondary current (welding current) I of direct current flows to the to-be-welded materials 124 and 126 through the welding electrodes 120 and 122, and the weld part of the to-be-welded materials 124 and 126 is metallurgically joined by Joule heat. do.

In the medium inverter resistance welding machine, the transformer input terminals 108A and 108B of the welding transformer 100 are input from the inverter 108, for example, 1 to 2 kilohertz, 300 volts, and 40 to 200 amps. From the transformer output terminals 114A and 114B of the welding transformer 100, for example, a DC welding current I of 2 to 6 kiloamps is supplied to the welded material 124 and 126.

9 and 10 show a secondary side transformer structure in a transformer for a conventional inverter type resistance welder. 9 and 10 are side and perspective views of this conventional secondary side transformer structure.

In this welding transformer, the secondary coil is composed of U-shaped coil members 130 and 132 made of two thick copper plates stacked in two stages. These U-shaped coil members 130 and 132 are mounted around a core (not shown) as a single winding coil, respectively, and each end portion or cutout portion is directed to the trans center portion. The upper coil member 130 is connected to one positive electrode common connecting member 134 of which one end (near end in FIGS. 9 and 10) is made of copper plate and the other end (ninth). In FIGS. 10 and 10, the far end) is connected to a center tab member 136 made of copper. The lower coil member 132 has one end (near end in FIGS. 9 and 10) connected to the center tab member 136, and the other end (in FIGS. 9 and 10). The far end) is connected to the other positive electrode common connecting member 138 made of copper plate.

Each of the positive electrode common connecting members 134 and 138 extends from the outer ends of the supporting parts 134a and 138a toward the coil so as to be connected to the flat plate supporting parts 134a and 138a and the ends of the coil members 130 and 132a. L-shaped connecting portions 134b and 138b (in Figs. 9 and 10, 138b is hidden and invisible), and supporting portions 134a and 134 for connecting to the anode terminals of the plurality of diodes 140 disposed opposite. The pair of end surfaces fixed to the inner side of 138a are composed of L-shaped connecting portions 134c and 138c.

On the opposite side of the L-shaped connecting portions 134c and 138c of the first and second positive electrode common connecting members 134 and 138, the first and second cross-sections of the copper plates are U-shaped negative electrode common connecting members 142 and 144. Is fixed to the inner surface of the common connecting plate 146 made of copper so that each projecting peripheral portion is fitted to the projecting peripheral portions of the L-shaped connecting portions 134c and 138c facing each other.

On each side of the protruding periphery of the negative electrode common connecting members 142 and 144 each having a cross section, a predetermined number of diodes 140 (eight on one side in the illustrated example) are mounted toward (connected to) each negative electrode terminal. It is fixed. The positive terminal of each diode 140 is coupled to each surface of the protruding periphery of the connecting portion 134c or 138c having an L-shaped cross section on the opposite side via the connecting piece 141 of the copper plate.

On the outer side surface of the common connection board 146, the back surface (inner side surface) of the heat radiating member 150 which consists of aluminum is adhesively fixed. On the surface (outer surface) of the heat dissipation member 150, a heat dissipation fin 150a having a comb-shaped cross section is provided.

Base ends of the pair of external connection members 154 and 156 are coupled to the bent ends of the common connecting plate 142. These external connection members 154 and 156 return from the side of the heat dissipation member 152 to the front of the heat dissipation fin 150a, and the front end portions 154b and 156b are integrally coupled to each other to protrude forward and forward. The transformer output terminal 114A is formed.

On the other hand, the base end of the external connection member 158 is coupled to the lower end of the center tab member 136. The external connection member 158 has heat dissipation fins 150a via the positive electrode common connection member 134 and 138, the diode 140, the negative electrode common connection member 142 and 144, the common connection plate 146, and the heat dissipation member 150. ), The tip portion 158a protrudes from the front center portion to the front front at a somewhat lower position to form the other transformer output terminal 114B.

In addition, although not shown in figure, a core consists of a "Japanese-shaped" silicon steel plate member. A pair of "E" magnetic silicon steel sheet members in the form of dividing "Japanese" characters into two in the longitudinal direction, or "E" magnetic silicon steel sheet members and "I" magnetic silicon steel sheet members, The primary coil is wound around the central protrusion of the member, and the secondary coil member is mounted thereon, and both members are combined to form a "Japanese" magnetic core, and the core is squeezed tightly with a band. Configure the trans assembly.

Since this type of transformer is often mounted on the arm tip of the robot, it is common practice to pull out the transformer output terminals 114A and 114B from one end of the transformer in the axial direction. In the conventional transformer described above, the external connection members 154 and 156 constituting the transformer output terminals 114A and 114B and the tip portions 154a, 156a and 158a of the external connection member 158 are placed in front of the heat radiation fins 150a. Protrudes forward from the structure.

In the conventional transformer described above, the heat dissipation member 150 absorbs a large amount of heat generated by each diode 140 through the cathode common connection members 142 and 144 and the common connection plate 146, and absorbs the heat absorbed by the heat dissipation fins. It emits to outside air from 150a. In order to increase the heat dissipation effect, supplying air for air cooling to the heat dissipation fins 150a by a fan (not shown) is also preferably performed. However, since the external connection members 154, 156 and 158 are covered by the heat dissipation fin 150a, the heat dissipation action of the heat dissipation fin 150a is hindered.

In addition, in the above-mentioned conventional transformer, the pair of external connection members 154 and 156 are rotated from the upper end and the lower end of the common connection plate 146 to the front of the heat dissipation fin 150a, and the front end portions of the both external connection members 154 and 156 ( 154a and 156a are integrally joined together. Thus, using the upper and lower pairs of external connection members 154 and 156, the upper side of the applied voltage applied to a plurality of (64) diodes 140 arranged in the longitudinal direction at the rear of the common connecting plate 146 To equalize to the lower side. Wax bonding is used for joining the front-end | tip parts 154a and 156a of these external connection members 154 and 156. As shown in FIG. This is because, in the case of engagement by bolt coupling, the contact angle is nonuniform and it is easy to cause electroforming. In addition, since the external connection members 154 and 156 made of copper have a small resistance value and a high thermal conductivity, resistance welding is not possible because the external connection members 154 and 156 do not generate enough heat even when a current flows. By this point, beeswax can bond together mutually favorable copper plates. However, beeswaxing is very difficult to work with and therefore requires skilled skill.

In addition, since these external connection members 154 and 156 have a long conductor length, a large loop is formed between the other external connection members 158, and further, the secondary side inductance is increased.

In the conventional transformer described above, a Schottky diode 140 is used for the rectifier element. Since the Schottky diode does not exist in a large capacity, the necessary rectifier element capability is secured by connecting the existing small capacity Schottky diode in parallel as many times as necessary. In addition, in order to mount these many diodes 140, L-shaped connection parts 134b and 138b of cross section are provided in the anode common connection member 134, or C-shaped cathode common cross section is provided in the common connection board 146. The connection members 142 and 144 are fixed to each other. In general, the above-mentioned conventional transformers are complicated in structure, have many parts and assembly processes, and are difficult to repair.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems of the prior art, and provides an inverter-type resistance welder transformer having a small number of parts, a simple assembly process, and a small secondary inductance.

1 is a plan view showing the overall configuration of an inverter-type resistance welding machine transformer according to an embodiment of the present invention.

2 is a side view showing the overall configuration of a transformer in an embodiment.

3 is a side view showing the secondary transformer structure in the embodiment.

4 is a perspective view showing the secondary transformer structure in the embodiment.

5 is a partially cutaway perspective view showing the secondary side transformer structure in the embodiment.

6 is a perspective view showing the secondary transformer structure in the embodiment.

7 is a partially cutaway perspective view showing the secondary side transformer structure in the embodiment.

8 is a circuit diagram showing the circuit configuration of the main portion of the inverter type resistance welder.

9 is a side view showing the secondary side transformer structure in a conventional inverter-type resistance welding machine transformer.

10 is a perspective view showing a secondary side transformer structure in a conventional inverter-type resistance welding machine transformer.

Explanation of symbols on the main parts of the drawings

14A (64c)... First transformer output terminal 14B (68c). 2nd transformer output terminal

18. Core 20... Primary coil member

22. First secondary coil member 24.. Secondary secondary coil member

30. Heat radiating member 30b. Rectifier element mounting surface

34. First anode common connection member 38. Center tab member

44. Second positive electrode common connecting member 48. Cathode Common Connection Member

50, 52... First diodes 54, 56. 2nd diode

64. First external connection member 68... Second external connection member

In order to achieve the above object, the first inverter resistance welding machine transformer of the present invention inputs AC power from an inverter to a primary coil and outputs DC power from a rectifying element connected to the secondary coil. In the inverter-type resistance welding machine transformer, a heat dissipation member having a rectifying element mounting surface and a common connection plate are mounted on the rectifying element mounting surface of the heat dissipating member via a conductive connecting plate, and each of the terminals is described above. First and second rectifier elements connected to the common connecting plate, and the first and second rectifiers disposed on one side of the heat dissipation member as viewed from the above-mentioned rectifier element mounting surface, and connected to each other via the center tab member. The heat dissipation described above for electrically connecting the second secondary coil member and the end of the first secondary coil member to the other terminal of the first rectifying element. The other side of the second rectifying element, wherein the conductive first internal connection member extends from one side hand of the ash to the front face of the rectifying element mounting surface and the end of the second secondary coil member described above. A second conductive internal connection member which extends from one lateral hand of the heat dissipation member to the front side of the rectifier element mounting surface for electrically connecting to the terminal, and the heat dissipation in view of the rectifier element mounting surface Protruding from one end of the common connecting plate to electrically connect the first and second output terminals disposed in the other transverse hand of the member and the common connecting plate to the first output terminal. The electrically conductive first external connection member extending to the other transverse hand of the heat dissipation member and the center tab member electrically connected to the second output terminal. A second external connection member, which is conductive, extending from one transverse hand of the heat dissipation member to the other transverse hand of the heat dissipation member via the front face of the rectifying element mounting surface for connection; It was set as the structure.

In the transformer of the second inverter type resistance welder of the present invention, in the aforementioned first inverter type resistance welder transformer, the one terminal and the other terminal of each of the above rectifier elements are the same. It was set as the structure provided in each pair of mutually opposing surfaces of a rectifier element.

The third inverter resistance welder transformer of the present invention is the rectifier of the heat dissipation member described above in which the first rectifier element and the second rectifier element are used in the transformer of the second inverter type resistance welder. It was set as the structure arrange | positioned at one or several side by side in the transverse direction, respectively, mutually longitudinally spaced on the element mounting surface.

The fourth inverter resistance welding machine transformer of the present invention is the inverter resistance welding machine transformer according to any one of the first to third aspects, wherein the heat dissipation member is opposite to the rectifying element mounting surface. It was set as the structure which has a fin for radiating heat.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.

1 and 2 show the overall configuration of an inverter resistance welding machine transformer according to one embodiment of the present invention. 1 is a plan view of the transformer, and FIG. 2 is a side view of the transformer.

This welding transformer is housed in a basket 10. Input terminals 12A, 12B are mounted on one side of the photoreceptor 10, and output terminals 14A, 14B are taken out on the opposite side. The input terminals 12A, 12B are connected to the output terminal of the inverter 116 (see FIG. 8), and the output terminals 14A, 14B are connected to the welding electrodes 120, 122 (see FIG. 8).

In the photoreceptor 10, a transformer unit 16 is provided at a position near the input terminals 12A and 12B from the center. The transformer unit 16 attaches the core 18 to the primary coil member 20 of the double winding and the secondary coil members 22 and 24 of the single winding integrally. Both ends of the primary coil member 20 are connected to the input terminals 12A, 12B via cables 26A, 26B, respectively.

The core 18 is made of a "Japanese" magnetic silicon steel sheet member as in the prior art. For example, a pair of "E" magnetic silicon steel sheet members in the form of dividing "Japanese" characters into two in the longitudinal direction are prepared, and the primary coil member 20 is wound around the central protrusion periphery of the "E" magnetic member, The secondary coil members 22 and 24 are disposed thereon, and both " E " magnetic members are stabbed together to form a " day " magnetic core 18, and the outer peripheral surface of the core 18 is band ( The transformer unit 16 is assembled by tightening to 18a).

Between the transformer unit 16 and the output terminals 14A and 14B, a plurality of rectifier elements 28 made of large-capacity silicon diodes, a heat dissipation member 30 made of aluminum, and air-cooled to the heat dissipation member 30 are provided. The fan 32 etc. for supplying the wind of this is arrange | positioned. In addition, the ventilation hole (not shown) is provided on the side of the photoreceptor 10.

3 to 7, the secondary transformer structure in the transformer of this embodiment is shown. 3 is a side view of the secondary transformer structure, FIGS. 4 and 6 are perspective views of the secondary transformer structure from different directions, and FIGS. 5 and 7 are partial views of the secondary transformer structure from different directions. It is a notch perspective view.

Both secondary coil members 22 and 24 are thick copper plates, and are parallel to the central peripheral portion (not shown) of the core 18 such that each end portion or cutout portion is bent c-shaped toward the trans center portion. It is wound up and turned.

The first secondary coil member 22 has a first positive electrode common connecting member 34 having an L-shaped cross section in which one end portion (the upper portion in FIGS. 4 and 5) is made of copper plate. The other end (lower end in FIGS. 4 and 5) 22b is connected to the base end (short periphery) 34a of the < RTI ID = 0.0 > It is connected to the 1st protrusion piece connection part 38a with the bolt 40 (refer FIG. 7).

In the second secondary coil member 24, one end (upper end in FIGS. 4 and 5) 24a is bolted to the second projection piece 38b of the center tab member 38. The other end (lower end in FIGS. 4 and 5) is connected to the base end (short periphery) 44a of the second positive electrode common connecting member 44 whose L-shaped cross section is made of copper plate. It is connected with the bolt 46.

The heat dissipation member 30 has a short heat dissipation substrate 30a, and has a flat single side of the substrate 30a as the rectifier element mounting surface 30b, and the heat dissipation fin 30c having a comb-shaped cross section on the opposite side. This is done by installing The first and second secondary side coil members 22 and 24 have one lateral hand (right hand in FIGS. 4 and 5) as viewed from the rectifying element mounting surface 30b of the heat dissipation member 30. Is placed on.

On the rectifying element mounting surface 30b of the heat dissipation member 30, four large-capacity silicon diodes 50, 52, 54, 56 are provided with respective bolts 58 via a cathode common connecting plate 48 made of copper. It is attached so that attachment and detachment are possible. Each diode 50, 52, 54, 56 has a box-shaped casing made of resin, and the plate-shaped cathode terminals 50a, 52a, 54a, 56a provided on the bottom of the casing have a cathode common connecting plate 48. It is in close contact with ().

On the upper surface of the casing of each of the diodes 50, 52, 54 and 56, two plate-like anode terminals 50b, 52b, 54b and 56b having screw holes are provided (see Fig. 5). ).

On the positive electrode terminals 50b, 52b of the first diodes 50, 52 arranged side by side in the upper half of the rectifying element mounting surface 30b of the heat dissipation member 30, the first positive electrode common connecting member 34 The middle to tip portion (long peripheral portion) 34b is connected by a bolt 60.

Intermediate to tip portions (long periphery) of the second positive electrode common connection member 44 are provided on the positive electrode terminals 54b and 56b of the second diodes 54 and 56 arranged side by side in the lower half of the rectifying element mounting surface 30b. (44b) is connected to the bolt (62).

In the other transverse hand (left hand in FIGS. 4 and 5) seen from the rectifying element mounting surface 30b, one end 48a of the cathode common connecting plate 48 is formed of the heat dissipation member 30. The base end (short periphery) 64a of the L-shaped first external connection member 64 is fixed to the bent end 48a by a bolt 66 to the one end surface. The long peripheral portion 64a of the first external connection member 64 protrudes vertically (in the front direction of the left hand) from the bent end 48a of the negative electrode common connecting plate 48, and the first transformer output terminal. It constitutes 14A.

The center tab member 38 has the 3rd protrusion piece connection part 38c which protruded to the outer side of the 1st secondary side coil member 22 in the position near the 1st protrusion piece connection part 38a. The base end portion 68a of the second external connection member 68 is fixed to the third protrusion piece connection portion 38c with the bolt 70. The intermediate portion 68b of the second external connection member 68 extends straight to the other transverse hand (left hand) via the front face of the rectifying element mounting surface 30b of the heat dissipation member 30. From the end of the intermediate portion 68b, an end portion 68c having an L-shaped cross section extends forward. The tip portion 64c of the second external connection member 68 constitutes a second transformer output terminal 14B.

The circuit configuration of the transformer according to the present embodiment is equivalent to the circuit configuration of the welding transformer 100 of FIG. A high frequency alternating current pulse from the inverter 116 is applied to the primary coil member 20 through the input terminals 12A and 12B and the cables 26A and 26B. The high frequency alternating current is induced by induced electromotive force through the core 18. Pulses are generated between the terminals 22a and 24b of the secondary coil members 22 and 24.

In a half cycle in which the secondary AC pulse is bipolar, a forward voltage is applied to the first diodes 50 and 52 and a reverse voltage is applied to the second diodes 54 and 56. When the first diodes 50 and 52 are conductive, the first secondary coil member 22 ⇒ the first positive electrode common connecting plate 34 ⇒ the first diode 50 and 52 ⇒ the negative electrode common connecting plate 48 ⇒ first external connection member 64 ⇒ first transformer output terminal 14A, 64b ⇒ welding electrode 120 ⇒ welding material 124, 126 ⇒ welding electrode 122 ⇒ second transformer output terminal 14B ), (68c) ⇒ 2nd external connection member 68 ⇒ center tap member 38 ⇒ secondary current flows in the path of the 2nd secondary side coil member 24. In the half cycle in which the secondary AC pulse is negative, a reverse voltage is applied to the first diodes 50 and 52, and a forward voltage is applied to the second diodes 54 and 56. When the second diodes 54 and 56 are conducting, the second secondary coil member 24 ⇒ the second positive electrode common connecting plate 44 ⇒ the second diode 54 and 56 ⇒ the negative electrode common connecting plate 48 ⇒ First external connection member 64 ⇒ first transformer output terminal 14A, 64b ⇒ welding electrode 120 ⇒ welding material 124, 126 ⇒ welding electrode 122 ⇒ second transformer output terminal 14B, (68c) Secondary current flows through the path of the second external connection member 68 and the center tab member 38 and the first secondary coil member 22.

The secondary coil members 22 and 24 are single winding coils, and since the inductance is extremely low and most of the secondary conductive members including the secondary coil members 22 and 24 are made of copper having low resistance, the secondary side The circuit has a fairly large secondary current. Because of this, each diode 50, 52, 54, 56 generates a significant amount of heat. Heat generated in each of the diodes 50, 52, 54, and 56 is absorbed by the heat dissipation member 30 through the cathode common connecting plate 48 and is discharged into the atmosphere from the heat dissipation fin 30c of the heat dissipation member 30. The wind supplied from the air cooling fan 32 to the heat dissipation fins 30c increases the heat dissipation effect.

In the transformer of this embodiment, the secondary coil members 22 and 24 are disposed in one lateral hand (the right hand in FIGS. 4 and 5) as seen from the rectifying element mounting surface 30b of the heat dissipation member 30. At the same time, the transformer output terminals 14A and 14B are disposed in the other transverse hand (the left hand in FIGS. 4 and 5), and one of the heat dissipation members 30 on the side of the transformer output terminals 14A and 14B is disposed. The first external connection member 64 protrudes from one end portion 48a of the negative electrode common connecting plate 48 adjacent to the side surface, extends to the first transformer output terminal 14A, and at the same time, the heat dissipation member 30 From the third projection piece 38c of the center tab member 38 present in one transverse hand (right hand) of the second external connecting member 68 via the front face of the rectifying element mounting surface 30b. Sphere extending to the second transformer output terminal 14B of the other transverse hand (left hand) of the heat dissipation member 30 It is a.

Such a structure ensures a basic (standard) form of a transformer in which the secondary coil member and the transformer output terminal are arranged on both sides of the heat dissipation member, but does not arrange any conductive member around the heat dissipation fins 30c. In addition to increasing the number of parts, the transformer structure has been realized in which the number of parts is as small as possible.

Moreover, since the 1st external connection member 64 which connects the one end 48a of the negative electrode common connection board 48 to the 1st transformer output terminal 14A is comprised in the minimum length, and a voltage drop is small, a diode Substantial deviation does not occur in the applied voltage of (50, 52, 54, 56). For this reason, it is not necessary to pull out the separate 1st external connection member 64 from the opposite end part of the negative electrode common connection board 48. FIG. Thereby, the process of joining two copper plates (connection member) with a wax is unnecessary.

Moreover, since the loop formed between the 1st external connection member 64 and the 2nd external connection member 68 is small, the secondary side inductance is small.

In the transformer of this embodiment, a large-capacity silicon diode (50 to 56) is used for a total of four in a set of two in the rectifying element, which is the conventional transformer (FIGS. 9 and 10). The rectification ability equivalent to 64 Schottky diodes 140 is obtained.

In addition, the number, arrangement position, arrangement pattern, and the like of the diodes mounted on the rectifying element mounting surface 30b of the heat dissipation member 30 are selected according to the magnitude of the use current. Depending on the structure of the diode and the specifications of the secondary circuit, it is also possible to reverse the direction of the diode (positional relationship between the anode and the cathode).

The structure of the heat dissipation member 30 in the above-described embodiment, in particular, the structure of the heat dissipation fins 30c is one example, and various heat dissipation structures can be adopted. The shape of the secondary side coil members 22 and 24 and the center tab member 38 can also be variously modified, it is also possible to form individual members integrally, and to further refine the shape.

In addition, if necessary, the transformer output terminals 14A, 64b, 14B, and 68c are separated from the heat dissipation member 30 to the opposite side to the secondary coil members 22 and 24, and are substantially perpendicular to each other. It is also possible to arrange in a direction (for example, an upward direction in FIGS. 4 and 5).

As described above, according to the inverter-type resistance welding machine transformer of the present invention, the secondary coil member is disposed in one transverse hand of the heat dissipating member as viewed from the rectifying element mounting surface provided in the heat dissipating member, and the other transverse direction is disposed. By arranging the transformer output terminal in the hand and installing the conductive connecting member connecting the secondary coil member, the rectifying element, the heat dissipation member, and the transformer output terminal at an appropriate position or an appropriate route, the number of parts is reduced and assembled. In addition to simplifying the process, the secondary inductance can be reduced.

Claims (4)

In an inverter-type resistance welding machine transformer for inputting the AC power from the inverter to the primary coil, and outputs the DC power by a rectifying element connected to the secondary coil, A first and a second heat dissipation member having a rectifying element mounting surface and a common connecting plate mounted on the rectifying element mounting surface of the heat dissipating member via a conductive common connecting plate, and each terminal is connected to the common connecting plate. A second rectifying element, a first and a second secondary coil member disposed in one transverse hand of the heat dissipation member as viewed from the rectifying element mounting surface, and connected to each other via a center tab member; A conductive extending from one transverse hand of the heat dissipating member to the front of the rectifying element mounting surface for electrically connecting an end portion of the first secondary coil member to the other terminal of the first rectifying element. The heat dissipation described above for electrically connecting the adult first internal connection member and the end of the second secondary side coil member to the other terminal of the second rectifying element. A conductive second internal connection member extending from one transverse hand of the ash to the front face of the rectifying element mounting surface and the other transverse hand of the heat dissipating member as seen from the rectifying element mounting surface. Protrudes from one end of the common connecting plate and extends to the other transverse hand of the heat dissipating member to electrically connect the first and second output terminals and the common connecting plate to the first output terminal. Via the front side of the said rectifier element mounting surface from one lateral hand of the said heat dissipation member, in order to electrically connect the said 1st external connection member which was made conductive, and the said center tab member to the said 2nd output terminal. And a conductive second external connection member extending to the other transverse hand of the heat dissipation member. Transport for resistance welders. The inverter type resistance welder transformer according to claim 1, wherein one terminal and the other terminal of each rectifying element are provided on a pair of opposing surfaces of the rectifying element, respectively. The inverter type resistor according to claim 2, wherein the first rectifying element and the second rectifying element are arranged one or more in parallel in the transverse direction at a distance from each other in the longitudinal direction on the rectifying element mounting surface of the heat dissipation member. Transformer for welding machine. The inverter type resistance welder transformer according to any one of claims 1 to 3, wherein the heat dissipation member has a heat dissipation fin on a surface opposite to the rectifier element mounting surface.