Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2005-03-28
2009-10-27
Leung, Quyen (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S268000
Reexamination Certificate
active
07608964
ABSTRACT:
It is an object of the present invention to provide techniques for improving efficiency and torque of a motor while achieving thinning of the motor. In a brushless DC motor, a rotor includes a magnetic-field creating magnet and a stator includes an armature winding. The magnetic-field creating magnet and the armature winding are placed to locally face in a radial direction orthogonal to an axial direction. This reduces a thickness of the brushless DC motor which extends in the axial direction. Also, a short-circuit yoke plate for joining and magnetically short-circuiting the north pole and the south pole of a permanent magnet is placed on a negative side in the axial direction with respect to the magnetic-field creating magnet. By provision of the short-circuit yoke plate, a magnetic path on a negative side in the axial direction with respect to the magnetic-field creating magnet can be shortened. Accordingly, magnetic reluctance occurring during rotational movement of the brushless DC motor can be reduced, to thereby improve efficiency and torque of the brushless DC motor.
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Takaharu Takeshita et al.; “Sensorless Brushless DC Motor Drives Using Current Estimation Error”; T.Lee Japan,; vol. 115-D, No. 4, '95.
Takaharu Takeshita et al.; “Back EMF Estimation-Based Sensorless Salient-Pole Brushless DC Motor Drives”; T.Lee Japan,; vol. 117-D, No. 1, '97.
Daikin Industries Ltd.
Global IP Counselors
Leung Quyen
Mok Alex W
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