Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2007-11-20
2007-11-20
Tran, Nguyen (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S054000, C310S216055, C029S598000
Reexamination Certificate
active
11340522
ABSTRACT:
A motor capable of reducing cogging torque depending on teeth of a stator, and a motor manufacturing apparatus for manufacturing this motor. The angles of rolling directions of cores stacked are set so that the phase difference between the phases of cogging torques produced on the cores is 180° so that the cogging torques produced on the cores cancel each other to reduce the total cogging torque in the motor. The motor comprises a laminated core formed by stacking a plurality of cores made from a rolled electromagnetic sheet steel. The cores forming the laminated core have rolling directions different from each other by a specified machine angle determined depending on the number of slots and/or the number of poles, where the specified machine angle is an angle which produces a phase difference of 180° between the phases of cogging torques produced due to magnetic anisotropy of the cores and the arrangement of teeth depending on the number of slots and/or poles of the motor.
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Maeda Takuya
Yamamoto Tomonaga
Fanuc Ltd
Staas & Halsey , LLP
Tran Nguyen
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