Rotary electric machine
AssigneeHitachi, Ltd.
InventorTadao Murakami
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Abstract
A rotary electric machine comprising a plurality of magnets with magnetic poles made of different B-H characteristics is disclosed in which a magnet with high coercive force is arranged on the portion of each pole where the magnetic field is weakened and a magnet with high magnetic flux density on the portion of each pole where the magnetic field is strengthened or little weakened.
Claims8
In a rotary electric machine comprising a rotor, a stator, and at least a pair of magnetic poles associated with one of said rotor and stator, each of said pair of magnetic poles including at least one magnet having different B-H characteristics along the direction of rotation of said rotor, said magnet including a portion having the highest coercive force where the magnetic field is weakened and a portion having the highest magnetic flux density where the magnetic field is strengthened, the improvement comprising said magnet including intermediate portions where the magnetic flux density and the coercive force are progressively substantially increased and decreased respectively.
Dependencies are inferred from the claim text.