Obstruction detection in automatic portal control apparatus empl

Details Obstruction detection in automatic portal control apparatus empl Obstruction detection in automatic portal control apparatus empl

1988-03-03

1989-08-08

Smith, Jr., David

Electricity: motive power systems

Motor-reversing

Periodic- or intermittent-reversing

318729, 318469, 49 28, H02P 318

Patent

active

048556530

ABSTRACT:
The present invention is a load sensor for use in an automatic portal operator such as an industrial gate operator. An induction motor is employed to move the gate. The power factor of the AC electric power supplied to the induction motor is monitored. A safety operation is triggered when the power factor indicates the motor load is greater than a predetermined amount, as when an obstruction is encountered by the gate.

REFERENCES:
patent: 3600657 (1971-08-01), Pfaff
patent: 4335339 (1982-06-01), Brickner
patent: 4394607 (1983-07-01), Lemirande
patent: 4454462 (1984-06-01), Spann
patent: 4710692 (1987-12-01), Libert et al.

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