Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1994-09-27
1996-07-23
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310194, 310 62, 310 63, 416155, 416162, H02K 700
Patent
active
055392636
ABSTRACT:
A direct current fan has a base, a stator assembly fixed to the base, a spindle extending from said the stator assembly, and a blade assembly rotatably mounted to the spindle. The stator assembly includes a central axle and a bobbin having electrically conductive winding formed over the central axle. Pole plates alternately extend from diametrically opposed upper and lower disks which are mounted to the respective upper and lower ends of the central axle. Each said pole plate has first and second circumferential sections located at different distances from the central axis. The blade assembly includes a cylindrical member having blades mounted thereto and a circular central recessed portion. A hub is formed in the center of the recessed portion for receiving a portion of the spindle. The hub has an aperture in its center and a plurality of tabs equally spaced around the aperture. Each tab has an inner surface inclined toward the central axis, the angle of inclination being in a direction opposite the direction of rotation of the hub. A lubricant is placed between the spindle and the hub to enhance rotation of the blade assembly. A magnet is fit along the circumference of the central recessed portion. In operation, an electrical current is applied to the winding through the circuit board to alternate the magnetic polarity of the pole plates for continuously exerting a rotation force on the magnet, thereby forcing the blade assembly to rotate about the central axis.
REFERENCES:
patent: 5170086 (1992-12-01), Wrobel
patent: 5270604 (1993-12-01), Sandel
patent: 5363003 (1994-11-01), Harada
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