Electricity: motive power systems – Positional servo systems – With particular motor control system responsive to the...
Patent
1984-03-19
1985-04-16
Witkowski, S. J.
Electricity: motive power systems
Positional servo systems
With particular motor control system responsive to the...
318696, 83369, H02K 2904
Patent
active
045118329
ABSTRACT:
A door movement control apparatus and method are provided for opening and closing door apparatus with a stepper motor supplied control pulses in response to a command signal indicating the desired movement direction. A table of time delays for the respective control pulses and resulting motor steps provides a desired speed pattern for the door movement. A comparison of the number of motor steps taken with the number of control pulses provided is made to determine when a closing door is obstructed.
REFERENCES:
patent: 4106685 (1978-08-01), Strunc et al.
Bergmann Saul M.
Brodahl R. G.
Westinghouse Electric Corp.
Witkowski S. J.
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