Electrical machine including a magnetic flux weakening apparatus

An electric machine comprising:

• a housing;
• a stator fixed with respect to said housing;
• a rotor having a magnetic field generating device for generating a magnetic flux, wherein said rotor is disposed to be coaxially rotatable relative to said stator and wherein a gap is formed between said stator and said rotor;
• a flux changing apparatus including a body, said body being displaceable in an axial manner relative to said rotor and being disposed axially outside said magnetic field generating device so as to change a magnetic flux within the gap in dependence upon an axial position of said body relative to said rotor;
• said flux changing apparatus including an adjusting device for axially adjusting the axial position of said body relative to said rotor;
• said adjusting device including an actuator and an adjusting element;
• and
• said actuator acting on said body via said adjusting element and said adjusting element engaging with at least one of said body and said actuator in such a manner that a rotational movement of said body is decouplable from at least one element selected from the group consisting of said adjusting element, said housing, said rotor, and said actuator, wherein said body is displaceable toward an axial end face of said rotor so as to produce a magnetic short circuit at least of a portion of leakage magnetic flux components of said rotor at said axial end face of said rotor, wherein said body has an end face facing said rotor and has a structuring on said end face facing said rotor and wherein said magnetic field generating device generates a magnetic flux on said axial end face of said rotor, said structuring on said end face facing said rotor is adapted to said magnetic field generating device in order to allow a targeted magnetic flux weakening.