Siemens Aktiengesellschaft

Klaus Greubel

Axel Knauff

Bruno Heim

Klaus Happel

Felix Ludwig

Jochen Pecher

Thomas Niklaus

Uwe Schueller

Heinrich Hellmann

Erhard Derleth

An air-cooled electric rotary machine includes a stator with a stator core formed of laminations and having axial ends, which terminate in winding end portions, and a rotor, which is encircled by the stator with an air gap therebetween. Plural air channels, separated from one another, are formed in or at the stator core for allowing an air stream in complementary flow directions, wherein the air stream is generated by a single fan and deflected at the winding end portions in a looped air stream conduction.

Air-cooled electric rotary machine

An electric machine, includes a stator with a laminated stator body having winding end portions potted in a cast, and a rotor for interaction with the stator. In order to cope with the increased heat development in the zone of the winding end portions compared to the zone of the stator body, the cast of the winding end portions is formed with surface-enlarging structures in heat-conducting contact with a cooling jacket or with a cooling medium, and/or the cast is provided at least partially with a heat-conducting envelope which carries off heat.

Electric machine with improved cooling feature

In order to suppress virtually completely the cyclic power variation of a linear synchronous motor, the latter has the following features. At least one primary part ( ) and at least one secondary part ( ), which has a sequence of poles ( ) formed by permanent magnets, and is also larger than the length of the primary part ( ) in the movement direction ( ). The primary part ( ) has primary slots ( ) which are suitable for receiving monophase or polyphase windings. Moreover, the primary part ( ) has means for changing the magnetic force in the movement direction ( ) of the linear motor in the region of the end piece ( ) of the primary part ( ). The end faces ( ) of the end pieces ( ) extend perpendicular to the movement direction ( ) of the linear motor.

Linear synchronous motor

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Bad Neustadt, Germany

Klaus Greubel