Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1994-11-16
1997-04-01
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310261, H02K 118
Patent
active
056169744
ABSTRACT:
The present invention is a fan motor for use in various types of electronic equipment, more particularly fan motors which may cool heat radiating electronic parts, in which the object is (a) to prevent noise caused by the air-cutting sound of the fan motor, (b) to allow easy alteration of the blowing direction, and (c) to eliminate damage caused by the counter electromotive force of the field magnetic coil.
The fan motor of the present invention consists of (a) a rotor formed by installing permanent magnets on a vane wheel, and (b) a stator formed by installing an electromagnet and a magnetic body on the inside circumferential surface of a casing. A circumferential-edge ring is installed on the vane wheel, so that noise caused by the air-cutting sound of the fan motor is prevented. A conductive circuit is connected to the field magnetic coil of the electromagnet, and the aforementioned magnetic body can be selectively positioned in a relatively advanced angular position (P.sub.1) or a relatively retarded angular position (P.sub.2) with respect to the electromagnet. A diode (D.sub.2) which eliminates any surge voltage caused by the counter electromotive force of the field magnetic coil is installed in the conductive circuit.
REFERENCES:
patent: 4553075 (1985-11-01), Brown
patent: 4952915 (1990-08-01), Jenkins
patent: 5148070 (1992-09-01), Frye
patent: 5296775 (1994-03-01), Cronin
patent: 5337030 (1994-08-01), Mohler
patent: 5440185 (1995-08-01), Allwine, Jr.
patent: 5455474 (1995-10-01), Flynn
patent: 5463263 (1995-10-01), Flynn
Jones Judson H.
Nagel Susan E.
Stephan Steven L.
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