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US 7,443,064 B2Granted
Permanent-magnet generator having protrusions for dissipating heat
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsNobuhiro Kihara, Kaoru Imaizumi
Life of this patent
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Abstract
A permanent-magnet generator includes a flywheel having a ringlike portion and a bottom portion which closes off one end of the ringlike portion and a plurality of protrusions bulging inward from the bottom portion of the flywheel. An irregular surface portion is formed in each of the protrusions for producing turbulence when the flywheel rotates, the irregular surface portion being irregularly shaped in section along a circumferential direction of the flywheel.
Claims8
A permanent-magnet generator comprising:
- a flywheel having a ringlike portion and a bottom portion which closes off one end of the ringlike portion;
- a plurality of magnets arranged on an inside surface of the ringlike portion of said flywheel;
- a plurality of air passages formed in the bottom portion of said flywheel;
- a plurality of protrusions bulging inward from the bottom portion of said flywheel;
- and
- a coil disposed to face said magnets for generating electricity by virtue of electromagnetic induction caused by relative movement of said coil and said magnets;
- wherein an irregular surface portion is formed in each of said protrusions, said irregular surface portion being configured so as to create a turbulent air flow when said flywheel rotates, said irregular surface portion being irregularly shaped along a circumferential direction of said flywheel, and
- wherein the irregular surface portion of each of said protrusions comprises at least two steps on each side of said protrusions, in said circumferential direction of said flywheel, and
- wherein each respective protrusion is located in between two respective adjacent air passages.
6 more elements
Dependencies are inferred from the claim text.