Resistor device for controlling a rotational speed of a motor
AssigneeDong A Electric Parts Co., Ltd.
InventorWoo Y. Lee
Life of this patent
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Abstract
A resistor device for controlling a rotational speed of a resistance unit and an open-circuit means. A receiving recess is provided to any one side surface of a heat sink vertically affixed to a top surface plate of a housing. A resistance unit, which is protected by a film and made of metal material forming a resistor circuit for gradually controlling the rotational speed of a motor, is received within the recess in the heat sink and connected to a terminal. An open-circuit means, having a soldered portion which is fused at a predetermined temperature upon an overload of the motor, is provided at a predetermined distance between the resistance unit and a terminal.
Claims6
A resistor device for controlling a rotational speed of a motor comprising:
- (a) a housing;
- (b) a fixed plate attached to said housing;
- (c) connecting terminals extending upwardly from said fixed plate;
- (d) a heat sink attached to said fixed plate for radiating heat produced by said resistor device, said heat sink having a receiving recessed portion on a side surface thereof;
- (e) a resistance unit comprising a metal band-shaped member closely contacted between a first film and a second film in a foil shape, said resistance unit received within said receiving recessed portion of said heat sink and connected to said connecting terminals to form a resistance circuit;
- and
- (f) an open-circuit means having a soldered portion characterized by fusing at a predetermined temperature, said open-circuit means positioned a predetermined distance from said resistance unit and connected to said resistance unit and a connecting terminal.
Dependencies are inferred from the claim text.