Electric machine

An electric machine, comprising:

• a housing having a front end and a rear end, said housing having a top face provided with a front air inlet opening in a vicinity of the front end, a rear air inlet opening in a vicinity of the rear end, and an air outlet opening extending the front air inlet opening and the rear air inlet opening;
• a stator arranged in the housing;
• a rotor supported in the housing for rotation about an axis of rotation;
• front and rear air conveying elements configured for drawing in air at the front and rear air inlet openings and for discharging air at the air outlet opening during operation of the electric machine;
• a cooler mounted on the top face of the housing and having side walls and a top cover that covers the front and rear air inlet openings and the air outlet opening provided between the housing and the cooler, such that air discharged through the air outlet opening from the housing into the cooler is fed back through the front and rear air inlet openings from the cooler into the housing, said cooler including a front partition arranged between the air outlet opening and the front air inlet opening, and a rear partition arranged between the air outlet opening and the rear air inlet opening, said front and rear partitions extending vertically upward from the top face of the housing in the cooler so that air discharged from the air outlet opening must firstly rise upwards between the partitions in the cooler and then it can flow across the partitions in the cooler downwards again to the air inlet openings;
• and
• air delivery elements extending from the partitions in the cooler and configured to feed air discharged at a region of the air outlet opening facing the front air inlet opening to the rear air inlet opening and to feed air discharged at a region of the air outlet opening facing the rear air inlet opening to the front opening, said delivery elements extending from upper ends of the partitions in the cooler, and being inclined at an angle relative to the partitions, wherein the air delivery elements are arranged in a region of upper ends of second regions and configured to deflect the air flowing to the air delivery elements by 45° to 70° or at least part of the air discharged in the region of the air outlet opening facing the front and rear air inlet openings in a direction of first regions of the partitions situated opposite when viewed in the direction of the axis of rotation,
• wherein the air delivery elements together with the front and rear partitions form two separate flow channels, wherein air discharged from the air outlet opening in the region of the air outlet opening facing the front air inlet opening is blown into one of the flow channels for feeding to rear air inlet opening, and air discharged from the air outlet opening in the region of the air outlet opening facing the rear air inlet opening is blown into the other one of the flow channels for feeding to the front air inlet opening, and
• wherein the air delivery elements comprise a transverse partition which extends at a right angle to the axis of rotation and separates the region of the air outlet opening facing the front air inlet opening and the region of the air outlet opening facing the rear air inlet opening from one another, said air delivery elements having each a separating element between the front and rear partitions and the transverse partition, said separating elements of the front and rear partitions extending, when viewed in the direction of the axis of rotation, from the front and rear partitions to the transverse partition, and, when viewed at a right angle to the axis of rotation, from side wall to side wall of the cooler, wherein the separating elements, when viewed at a right angle to the axis of rotation, are stepped or ramped in opposite directions from bottom to top, and the transverse partition, when viewed in a vertical direction, is interrupted between the separating elements.