Rotating alternating-current machine e.g. tetra-polar induction motor, has magnetic yoke comprising variable section in radial plane, where magnetic yoke is made of ferromagnetic material i.e. magnetic metal powder containing iron particles

摘要

The machine (10) has a stator and a rotor (11), where a gap (13) is formed between the stator and the rotor. The rotor is rotatably mounted on an axis relative to the stator. The stator or the rotor comprises a magnetic yoke provided with an electric coil (17), where the electric coils are partially extended in an axial direction. The magnetic yoke comprises a variable section in a radial plane, where the magnetic yoke is made of a ferromagnetic material i.e. magnetic metal powder containing iron particles.