Siemens Aktiengesellschaft

Erich Vojta

Horst Hendel

Michael Dittmann

Hans-Jurgen Sollner

Frank Cepa

Arthur Fiedler

Otto Foerster

Method and device for contacting the winding wire of a coil

Method for contacting high-current connecting elements of an electrical

A method is provided for soldering a coil winding to a terminal pin. A specific quantity of solder is applied onto the terminal pin, the terminal pin having a winding end wrapped therearound. The solder, for example, can be applied by immersing the pin end into a solder bath having a temperature only slightly above the melting point of the solder. Subsequently, the solder is melted with a welding torch under a protective atmosphere only at a power and time required to achieve a soft-soldering temperature. As a result thereof, a soldering free of fluxing agent and without the high thermal stress of a welding is possible. Other embodiments include placing a ring of solder onto the terminal prior to heating. Also, a predetermined length of solder wire can be brought into contact with the terminal pin prior to heating. The invention provides a guide tube device for such a purpose.

Method and apparatus for soldering a coil winding wire to a terminal pin

Welding process for connecting a winding wire of a coil to a terminal

A fine insulated wire with a diameter of less than 0.3 mm is attached to a connecting pin embedded in an electric component. The wire is wrapped around this connecting pin at least three times, and then argon-arc welded without melting the electrode. This welding operation is carried out from a distance of less than 3 mm and preferably on the order of 0.5 mm, for a short time such as for a period of less than 0.75 seconds, preferably on the order of 0.5 seconds. In order to avoid heating the wire is far above its melting point, which might destroy the wire or cause similar disadvantages, the connection pin is pre-tinned, the tin is rendered molten and the insulating coating of the wire is partially burned during the welding process in such a way that the solidified tin will hold the wire at several points.

Method for connecting a fine wire to a connecting pin

Growing community of inventors

Hemhofen, Germany

Erich Vojta