Patent ID: 6867530

Claim:
An electrical machine formed as an alternator for a motor vehicle, comprising a housing; a rotor supported in said housing for rotation around a rotation axis, said rotor including at least one rotor winding, a plurality of claw poles disposed circumferentially so that adjacent ones of said claw poles have an axial claw overlap L Ü , permanent magnets having axial magnet length L M , wherein at least one of said permanent magnets is located between every two adjacent ones of said claw poles and is so magnetized that a leakage flux between said claw poles is suppressed, and a ratio of the axial magnet length L M to the axial claw overlap L Ü is L M /L Ü ≧0.81, said claw poles extending axially from a claw-pole root to a claw-pole tip, each of said claw poles having a height H W at the a claw-pole root and a height H S at the claw-pole tip, and a ratio of the height H S at the claw-pole tip to the height H W at the claw-pole root is H S /H W ≧0.25.