Patent ID: 8513850

Claim:
Electric machine, particularly for a synchronous machine excited by a permanent magnet, comprising: a rotor arrangement having buried permanent magnets; a stator arrangement having an inner recess for rotationally movably receiving the rotor arrangement; the rotor arrangement comprising a plurality of rotor segments, each having a pole shoe, the outer contour thereof corresponding to an arc contour having a contour radius, the contour radius being smaller than the radius of the rotor arrangement, thus forming a gap between two adjacent rotor segments wherein the at least one outer contour of one of the rotor segments has an arc contour designed such that an air gap length ratio of the radial spacing between the inner recess and the outer contour along a radial outer boundary of the corresponding rotor segment and the radial spacing between the inner recess and the outer contour along a radial center axis of the corresponding rotor segment is optimized with regard to the distortion factor of the course of the flux density distribution of the pole shoe; wherein the rotor arrangement has a consequent-pole arrangement, wherein only every other rotor segment is provided with permanent magnets, wherein the permanent magnets have a like polarity with respect to the radial direction, wherein consequent-pole flux barrier regions, which define a consequent-pole angle with respect to the center of the rotor arrangement, are provided in each case at the two boundaries of a consequent-pole rotor segment disposed between two rotor segments provided with permanent magnets, wherein the consequent-pole flux barrier regions are configured such that a ratio of the consequent-pole angle to the angle of the rotor segment is optimized with regard to the distortion factor of the course of the flux density distribution of the pole shoe.