Siemens Mobility Gmbh

Siemens Aktiengesellschaft

Florian Schemmel

Steffen Lang

Niels Müller

Marek Maleika

Manfred Ochsenkühn

Markus Hösle

Markus Hoesle

Christoph Schultheiss

Christoph Schultheiß

The invention relates generally to the field of insulating electrical conductors against partial discharge in the medium- and high-voltage ranges. In particular, the invention relates to an insulating system for an electric machine, in particular a rotating electric machine such as an electric motor and/or a generator. The invention provides for the first time a substitute for the conventionally used mica as a barrier material in an insulating system, such as the main insulation of rotating electric machines such as motors and/or generators. The substitute is based on a polyether-imide/siloxane copolymer, which can be processed two-dimensionally, for example by surface extrusion. In this way, sheets are produced and, after being processed in sheet form or as a laminate, can be used as planar insulating materials, or cut as strips, in insulating systems.

Insulating system made of solid insulating material and impregnating resin

Various embodiments of the teachings herein include an insulation system. The system may include a solid insulation material including a two-dimensional insulant and a synthetic resin. The two-dimensional insulant includes a blend of a copolymer with a high-temperature thermoplastic. The synthetic resin includes a thermoset to impregnate the two-dimensional insulant and then cure the two-dimensional insulant.

Insulating system comprising a solid insulating material and impregnating resin

The present disclosure describes slot insulation systems for electrical rotating machines. For example, a system may include: a main insulation for a coil of the rotating machine or for an individual bar for the coil; a resin formulation serving as a slot adhesive forming a solid film. At room temperature and under standard conditions, the solid film is in an A-state. Heating the electrical rotating machine to a curing temperature for the resin formulation, the solid film firstly melts and flows within an occupied slot, then cures and solidifies to form a thermoset material.

Slot insulation system for an electrical rotating machine, method for producing a slot insulation system

A coil of a stator winding of an electric machine is formed of a number of windings, which are wound together with a number of layers of a mica tape, on which a number of layers of a cover tape are in turn wound. The coil is a three-dimensional form-wound coil. The mica tape has a bending stiffness of less than 50 N/m according to specification IEC 60371-2:2004 and a static friction coefficient between the top side and the bottom side thereof of less than 0.7 according to specification ISO 8295:1995.

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Nuremberg, Germany

Florian Schemmel