Electricity: motive power systems – Automatic and/or with time-delay means – Movement – position – or limit-of-travel
Patent
1994-09-19
1996-02-20
Ip, Paul
Electricity: motive power systems
Automatic and/or with time-delay means
Movement, position, or limit-of-travel
318443, 318444, H02P 104
Patent
active
054931916
ABSTRACT:
An improved actuator (10) wherein movement of an external potentiometer (R.sub.x) to drive a bi-directional motor (50) and move an attached member starts a timer (68). When a predetermined time period has elapsed, the actuator cuts power to the drivers (U1) of the motor, thereby putting the system into a "sleep" mode in which a minimum amount of current is drawn. If the external potentiometer was moved so as to cause an end of travel position of the member and the motor stalls, the actuator maintains this stall condition only until expiration of the predefined time period at which time the sleep mode is initiated. This sleep mode is thereafter maintained until power is reset or until the position of the external control potentiometer is changed. The time-out period is set to allow for full movement of the vane as well as to compensate for any uncertainty as to whether an end of travel position has been reached.
REFERENCES:
patent: 4591773 (1986-05-01), Numata
patent: 4611154 (1986-09-01), Lambropoulos et al.
patent: 4663575 (1987-05-01), Juzswik et al.
patent: 4686438 (1987-08-01), Ohe et al.
patent: 4705997 (1987-11-01), Juzswik
patent: 4765426 (1988-08-01), Shimizu
patent: 5034674 (1991-07-01), Sato
patent: 5084658 (1992-01-01), Nielsen et al.
patent: 5369342 (1994-11-01), Rudzewicz et al.
Andrews William A.
Phoy Chamroeun P.
Eaton Corporation
Ip Paul
Johnston Roger A.
Stec Jennifer M.
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