Electric motor

Details Electric motor Electric motor

2009-10-23

2011-11-01

Leung, Quyen (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S154210, C310S154080, C310S154010, C310S154250

Reexamination Certificate

active

08049387

ABSTRACT:
An electric motor has a rotor (20), a housing (10) and a ring magnet (12) fixed onto an inner surface of the housing. The housing (10) has a cross section in a polygon, preferably tetragonal, shape that comprises a plurality of side portions (10a˜10d) and a plurality of curved corner portions (11a˜11d), each of which connects two adjacent side portions. The thickness of the ring magnet at portions corresponding to the corner portions of the housing is larger than the thickness of the ring magnet at portions corresponding to the side portions of the housing. An air gap (123) is formed between a peripheral surface of the rotor and an inner surface of the ring magnet, the thickness of the air gap at portions corresponding to the corner portions of the housing being smaller than that of the air gap at portions corresponding to the side portions of the housing. The motor has a polygon housing which is convenient to install and has good space utilization.

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patent: 4896065 (1990-01-01), Tsuyama
patent: 7427817 (2008-09-01), Uenishi et al.
patent: 7498706 (2009-03-01), Kuroda
patent: 7528515 (2009-05-01), Kuroda
patent: 2007/0200444 (2007-08-01), Uenishi et al.
patent: 2157677 (2010-02-01), None
patent: 2157678 (2010-02-01), None
patent: 09224337 (1997-08-01), None

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