Electric machine and use thereof

An electric machine for selective operation as a transformer for AC voltage operation or as a throttle system for DC voltage operation, the electric machine comprising:

• a transformer core with two limbs including a first limb and a second limb;
• an additional winding with a first additional partial winding wound around said first limb and a second additional partial winding electrically connected to said first additional partial winding and wound around said second limb of said transformer core;
• a higher-voltage winding with a first higher-voltage partial winding wound around said first additional partial winding and a second higher-voltage partial winding electrically connected to said first higher-voltage partial winding and wound around said second additional partial winding;
• a first traction winding wound around said first higher-voltage partial winding, and a second traction winding wound around said second higher-voltage partial winding.