Method and apparatus for opening or closing a door by measuring

Details Method and apparatus for opening or closing a door by measuring Method and apparatus for opening or closing a door by measuring

1996-05-22

1998-11-17

Wysocki, Jonathan

Electricity: motive power systems

Motor-reversing

Automatic and/or with time-delay means

1602931, 49 26, H02P 300

Patent

active

058381260

ABSTRACT:
A method of electronically controlling the opening and/or closing of a door by a DC motor. An instantaneous position of the door is determined. The voltage across the terminals of the DC motor or the current flowing through the windings of the motor is regulated as a function of the determined instantaneous position. The above two operating steps are repeated at a predetermined time intervals for controlling the displacement of the door. To determine the instantaneous position of the door, the instantaneous voltage across the terminals of the motor is measured, and the instantaneous current flowing through the windings of the motor is measured. The displacement of the door during the present time interval is computed as a function of the measured instantaneous voltage and current values and as a function of known and constant values for the back-emf and for the internal resistance of the motor. The computed displacement is added to the value of the instantaneous position as determined during the preceding time interval to obtain the determined instantaneous position of the door at the end of the present time interval.

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patent: 5483135 (1996-01-01), Parks
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