Siemens Aktiengesellschaft

Dirk Van Riesen

Rolf Vollmer

Detlef Potoradi

The aim of the invention is to provide an electric motor which has a high torque at low rotation speeds and a high power at high rotation speeds. The invention therefore proposes an electric motor with permanent-magnet excitation having a first active part (), which is fitted with permanent magnets (), and a second active part (), which can be moved in relation to the first active part () by magnetic force of the permanent magnets (). The electric motor also has a heating device () with which the magnetic field of at least one of the permanent magnets () can be weakened by heating the permanent magnets as a function of a speed of the first active part () in relation to the second active part ().

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Tauberbischofsheim, Germany

Dirk Van Riesen