Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2008-09-02
2008-09-02
Lam, Thanh (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S179000, C310S06800R
Reexamination Certificate
active
11261321
ABSTRACT:
The invention relates to a brushless DC motor having an at least two-pole permanent magnet rotor and an at least two-pole stator whose poles carry an at least single-strand stator winding which can be energized with a current according to the rotor position by means of an electronic commutation device, there being a substantially uniform cylindrical air gap between the rotor and the stator. The rotor is characterized in that at least one stator pole, or a specially provided auxiliary pole having an auxiliary winding, is provided which is energized with a current to start up the motor. In accordance with a preferred embodiment of the invention, the auxiliary winding can additionally be used as a sensor winding to determine the position of the rotor.
REFERENCES:
patent: 4484114 (1984-11-01), Ebbs
patent: 5574342 (1996-11-01), Okamoto
patent: 5825113 (1998-10-01), Lipo et al.
Gummich Markus
Lelkes András
Cooper & Dunham LLP
Minebea Co. Ltd.
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