Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1985-03-22
1986-01-28
Shoop, Jr., William M.
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318466, 318266, 187 29R, H02P 300, B66B 130
Patent
active
045674116
ABSTRACT:
A counter (24) increments several times during the duty cycle of a microprocessor (10), and a comparator (30) connected to both outputs a High signal when the microprocessor output exceeds the counter output and outputs a Low signal when the counter output is at least the microprocessor output. The microprocessor output is proportional to desired motor speed for an elevator door drive motor according to a velocity profile stored in a ROM (18). Thereby, the High:Low ratio of the comparator output is a pulse width modulation signal, which is amplified (34) for the motor (12), at a much higher frequency than the microprocessor duty cycle.
REFERENCES:
patent: 4006392 (1977-02-01), Catlett et al.
patent: 4054820 (1977-10-01), Foster
patent: 4128142 (1978-12-01), Satoh et al.
patent: 4155426 (1979-05-01), Booker, Jr.
patent: 4337429 (1982-06-01), Stuart
patent: 4337929 (1983-08-01), Odaka et al.
patent: 4427933 (1984-01-01), Wagener et al.
patent: 4429264 (1984-01-01), Richmond
patent: 4449078 (1984-05-01), Ogishi et al.
patent: 4471281 (1984-09-01), Uezumi et al.
patent: 4472671 (1984-09-01), Shapiro
patent: 4489267 (1984-12-01), Saar et al.
Ackermann Bernd
Loeb Ruediger
Reimann Kurt
Ruther Claus
Ip Shik L. P.
Linde Gerald E.
Otis Elevator Company
Shoop Jr. William M.
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