Siemens Aktiengesellschaft

Wolfgang Pieper

Heribert Roeser

Guenther Horn

Ronald Gleixner

Horst Hoechamer

Albin Finck

A coil body is provided for a small synchronous motor with a stator housing surrounding the wound coil body. The winding ends and the connector ends are soldered to the connector pins which are fastened to the one frontal flange of the coil body with a radially overhanging connecting end. The overhanging connecting end with the soldered-on winding and connecting line ends are bent inwards towards the other frontal flange and are overlapped by a swivel cover with slot openings hinge-mounted on the other facing frontal flange in which the connector pins can be held in place to relieve the strain and insulate them from the surrounding stator housing.

Coil body and connections to an external line

The invention specifies a coil form which assures the possibility of production by automated means, a strain-relieved connection between external connecting lines, which can pass in an insulated fashion through an opening of a surrounding motor stator housing, and the coil winding ends of an exciter winding wound on the coil form. For this purpose connector sleeves are inserted and fixed in place to radially continuous, stepped diameter, fitting openings in a locking plastic bracket which is hinged-mounted by a plastic hinge on one end flange and which, after the connection has been made, can be swiveled over the exciter coil winding and locked on the other end flange. Around one set of sleeve ends of the connector sleeves which project out of the internal operating side of the plastic bracket, the coil winding ends of the exciter coil are wound. In the other set of sleeve ends the insulation stripped ends of the external connecting lines are inserted to make contact from the exterior operating side of the plastic bracket.

Electrical coil form with connector sleeves

The invention has developed an improved coil form permitting automated fabrication of a strain-relieved connection between external leads fed in an insulated fashion through an opening of a surrounding motor stator housing and the winding ends of the exciter winding wound on the coil form; for that purpose the design has a plastic bracket hinge-mounted and molded on an end flange of the coil form, which upon making the connection can be pivoted over the exciter winding and can then mate with the other end flange. Said plastic bracket has flat-tongued connector pins in access openings each having terminals on the inside for connection to the winding ends, which penetrate until they catch against a spacer piece overhanging the access opening and coming up against the outer side of the plastic bracket to ensure strain-relieved fastening; for additional anchoring, the projecting, still unwound internal terminals are twisted at a certain circumferential angle in an axially concentric fashion facing their portion inserted in the plastic bracket immediately above the access opening. This invention is particularly suitable for small synchronous motors fabricated on automated production lines.

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Wuerzburg, Germany

Wolfgang Pieper