Device for shutting off current through a motor start-up circuit

Details Device for shutting off current through a motor start-up circuit Device for shutting off current through a motor start-up circuit

1997-05-15

1999-09-14

Martin, David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318753, 318786, 318792, H02P 142

Patent

active

059528117

ABSTRACT:
A device for automatically shutting off a current is used in combination with a motor start-up component incorporated in a motor-driving circuit including an auxiliary coil which operates at a start-up time of a motor and a main coil for its steady-state operation. This motor start-up component includes a motor start-up thermistor with positive temperature characteristic having a first electrode and a second electrode, a first connector member having a first male terminal part and connected to the first electrode and a second connector member having a second male terminal part and connected to the second electrode. The motor start-up thermistor is connected in series to the auxiliary coil through the first electrode. The current-shutting device includes first and second terminal members each having a female terminal part for receiving a corresponding one the male terminal parts, a triac having a first triac terminal, a second triac terminal and a gate terminal, a triac-controlling thermistor with positive temperature characteristic and a case which encloses at least the triac and the triac-controlling thermistor.

REFERENCES:
patent: 3643142 (1972-02-01), McBride Jr.
patent: 3671830 (1972-06-01), Kruper
patent: 3832612 (1974-08-01), Woods
patent: 3852648 (1974-12-01), Barry et al.
patent: 3855509 (1974-12-01), Wright
patent: 3864844 (1975-02-01), Heidtmann
patent: 4276506 (1981-06-01), Little
patent: 5617001 (1997-04-01), Nacewicz et al.
patent: 5757162 (1998-05-01), Weber
Patent Abstract of Japan: Publication No. 08251959; Date of Publication of Application Sep. 27, 1996.

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