Patent ID: 7432624
Filing Date: 2008-10-07
Classification: H02K

Abstract:
1. A rotor for a permanent-magnet electrical machine, comprising: an axle mounted to the machine with bearings; a rotor pack made of iron and arranged around the axle; and permanent magnets adapted to the rotor pack, the permanent magnets forming a plurality of magnetic poles and being configured to maximize magnetic flux density at the respective centers of the plurality of magnetic poles and decrease the magnetic flux density towards the respective edges of the plurality of magnetic poles, wherein: each of the plurality of magnetic poles have a first edge and a second edge located close to the outer circumference of the rotor, and slots in the rotor on the route of the magnetic flux extending from close to the first and second edges essentially towards the center of each of the plurality of magnetic poles, and the slots are closer to the outer circumference of the rotor than the central axle of the rotor.