Cooling rotor for an alternator mounted on vehicle

A rotor for an alternator comprising:

• first and second claw-pole members formed of magnetic material and oppositely mounted on a shaft rotatable about an axis, said first and second claw-pole members having at least one first claw section and at least one second claw section respectively, said at least one first and second claw sections each having a respective side face and an inner diameter surface;
• a field coil disposed between said first and second claw-pole members;
• a first non-magnetic ring member having lands and recesses extending in a radial direction with respect to the axis of said rotatable shaft, said first non-magnetic ring member being disposed about said field coil and in contact with the inner diameter surfaces and at least part of the side faces of said at least one first and second claw sections;
• a second non-magnetic ring member disposed within said first ring member;
• and
• a permanent magnet held by said first and second non-magnetic ring members between said side faces of said at least one first and second claw sections and polarized in a direction which prevents magnetic flux leakage between said at least one first and second claw sections, said rotor having a space formed between said permanent magnet and at least one of said side faces of said at least one first and second claw sections.

A rotor for an alternator comprising:

• first and second claw-pole members formed of magnetic material and oppositely mounted on a shaft rotatable about an axis, said first and second claw-pole members having a plurality of first and second axially extending claw sections respectively;
• a field coil disposed between said first and second claw-pole members;
• and
• a plurality of permanent magnets, each being disposed between a respective first and second axially extending claw section and polarized in a direction which prevents magnetic flux leakage between said respective first and second axially extending claw sections, said rotor having a space formed between each of said permanent magnets and at least one of said respective first and second claw sections.