Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2008-05-06
2008-05-06
Le, Dang (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S154010
Reexamination Certificate
active
07368843
ABSTRACT:
A commutator motor includes a stator and a rotor, and the stator includes a stator yoke and a field magnet. The field magnet is fixed onto the inner peripheral surface of the substantially cylindrical stator yoke. The stator yoke is configured by coaxially stacking a plurality of plate-like annular bodies, and the annular bodies are fixedly connected to each other by caulking at a caulking portion disposed on the annular body. In manufacture, the length of the stator yoke in the axial direction can be arbitrarily changed with the thickness of the annular body in the axial direction as a minimum unit. In case of manufacturing various stator yokes that are different in the axial length, the necessity of replacing a manufacturing machine is eliminated, thereby providing a commutator motor having the stator yoke which is low in the manufacturing costs.
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Kato Ken-ichi
Mineta Tadayoshi
Oomori Katsuhiro
Sakamoto Shin'ichi
Yokota Tomoyoshi
Hanh Nguyen
Hitachi Koki Co,. Ltd.
Le Dang
McGuireWoods LLP
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