Siemens Aktiengesellschaft

Jörg Waschek

Frank Seibicke

Matthias Centner

Joachim Mucha

Rüdiger Schäfer

Patrick Gels

An electric machine has grooves and windings, divided into strands, of electrical conductors. At least one strand has a number s of coils connected in series and arranged in the grooves. Each coil has sub-conductors connected in parallel and arranged in bundles. Each bundle is arranged in a groove at a bundle position relative to a deepest possible bundle position in the groove. The positions of all bundles in all coils define a number b of possible bundle positions of the strand. The bundles are interchanged between the coils such that each bundle is arranged in the grooves at least n times and at most n' times at each possible bundle position, wherein n is the integer quotient in regard to the quotient of the number s and the number b, wherein n&#x2032;=n if s is divisible by b and n&#x2032;=n+1 if s is not divisible by b.

Reduction of the electrical resistance for an electric machine having windings arranged in grooves

A generator includes a stationary stator and a rotor disposed rotatably about an axis of rotation. The stator has a fan drawing air from the ambient air around the generator, wherein the inlet channel is disposed such that air drawn in by the fan is distributed at the core of the stator by the channel over the length of the core in the direction of the axis of rotation. Cooling channels running in the circumferential direction of the core and distributed over the length of the core are disposed on the core, wherein the stator comprises an outlet channel disposed offset in the circumferential direction of the core with respect to the inlet channel. The inlet channel is connected to the outlet channel by the cooling channels, such that air from the inlet channel flows through the cooling channels into the outlet channel.

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Falkensee, Germany

Jörg Waschek