ELECTRIC MOTOR

PROBLEM TO BE SOLVED: To improve the efficiency of an electric motor having a split core. SOLUTION: A core 20 split with a foundation portion 32 split and an erect portion 34 are fastened with bolts 36. This brings a joint surface 46 of the foundation portion 32 to the erect portion 34 into close co...

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Bibliographische Detailangaben
Hauptverfasser:	NAKAI HIDEO, INAGUMA YUKIO, HIRAMOTO KENJI, ARAKAWA TOSHIFUMI
Format:	Patent
Sprache:	eng
Schlagworte:	CONVERSION OR DISTRIBUTION OF ELECTRIC POWER DYNAMO-ELECTRIC MACHINES ELECTRICITY GENERATION
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To improve the efficiency of an electric motor having a split core. SOLUTION: A core 20 split with a foundation portion 32 split and an erect portion 34 are fastened with bolts 36. This brings a joint surface 46 of the foundation portion 32 to the erect portion 34 into close contact with each other, thus reducing magnetic resistance and improving efficiency. The bolt 36, made of non-magnetic material, reduces the number of magnetic fluxes passing through the bolt, thus reducing an eddy current developed in the bolt. Moreover, a ratio (H/D) of a distance H between a teeth front end face 48 and a bolt head top face 50 to a diameter D of a bolt hole is set at ≤0.3. COPYRIGHT: (C)2007,JPO&INPIT