Patent ID: 8536753
Filing Date: 2013-09-17
Classification: H02K,Y02E

Abstract:
1. An arrangement to ensure an air gap in an electrical machine, comprising: an electrical machine with a stator arrangement and a rotor arrangement, the rotor arrangement rotating around a longitudinal axis, wherein parts of the rotor arrangement interact with parts of the stator arrangement generate electrical power, wherein an air gap is defined by a distance between the parts of the rotor arrangement and the parts of the stator arrangement, wherein the parts of the stator arrangement are opposite to the parts of the rotor arrangement along a certain length, and wherein a cross section of the air gap changes along the certain length such that the air gap is not uniform in view to the referred certain length, wherein: the stator arrangement comprises a lamination stack which is constructed to support at least one winding of a stator-coil, the rotor arrangement comprises a plurality of permanent magnets, and the cross section of the air gap is configured by a change in a size of the plurality of permanent magnets located along the certain length.