Patent ID: 8217546

Claim:
A permanent-magnet, adapted to be used inside an electrical machine, the permanent magnet comprising: a surface, at least one base plane and a transition area, wherein a first side of the surface is adjacent to the base plane and is connected with the base plane via the transition area, wherein the surface is aligned to a coil and to an air gap of the electrical machine in a way, that magnetic forces of the permanent magnet interact via the surface and the air gap with the coil by a magnetic flux density distribution, and wherein the transition area has a cross-section that is determined by a Bezier function, which is assigned to and defined by three points, including respective first points P 1 assigned to respective opposite ends of said at least first side the surface, a second point P 2 assigned relative to the transition area and a third point P 3 assigned relative to the base plane, and wherein the transition area of the permanent magnet determined by the Bezier-function is based at least on the following control parameters: a first control parameter w ft having a value in a range from zero to one and configured to control a spacing between the respective first points P 1 , and a second control parameter m sh , having a value in a range from zero to one and configured to control a spacing of the third point P 3 relative to the base plane.