PERMANENTLY EXCITED ELECTRIC MACHINE

摘要

The invention relates to an electric machine having a stator and a rotor. The stator comprises a coil arrangement and the rotor has permanent magnets. The stator is spaced apart from the rotor thus forming an air gap. The stator has adjacent central poles oriented toward the air gap. Each central pole carries a concentrated winding and has two side poles toward the air gap. A non-magnetic rotor back carries magnetically conductive magnetic flux poles. Each magnetic flux pole is of a hollow prismatic shape having at least one cooling channel, wherein each cooling channel has through passages at the face-side ends thereof. The cross section of each magnetic flux pole is approximately trapezoidal. The longer side of the magnetic flux poles is oriented toward the air gap. Between two magnetic flux poles, one permanent magnet each is accommodated. The cross section of a permanent magnet is approximately trapezoidal. The shorter side of the permeant magnet is oriented toward the air gap. The oblique sides of the permanent magnet are oriented toward the oblique sides of the magnetic flux poles. Each permanent magnet has a magnetically tangential orientation. Adjacent permanent magnets have an magnetically opposite orientation.