Electricity: motive power systems – With particular motor-driven load device – Tension-maintaining type of motor-control system
Patent
1975-03-05
1977-09-27
Dobeck, B.
Electricity: motive power systems
With particular motor-driven load device
Tension-maintaining type of motor-control system
318 72, 318 77, H02P 550
Patent
active
040514153
ABSTRACT:
A motor control system for use in maintaining substantially constant linear speed of a web moving between a supply and a takeup reel such as in a reel driven magnetic tape transport. The rotational periods of the reels are measured to provide representative signals which are summed and compared with a reference to yield an error signal for control of takeup reel motor driving voltage such that the error voltage tends to become zero, resulting in substantially constant linear web speed. In alternative embodiment, the period representative signals are each non-linearly processed prior to summing to enhance the accuracy of web speed control. In further embodiment, the rotational frequencies of the web reels are measured to provide representative signals which are each non-linearly processed and then summed and from which summed signal is derived a resulting error voltage for web speed control.
REFERENCES:
patent: 3351831 (1967-11-01), Hemphill et al.
patent: 3549948 (1970-12-01), Jaeschke
patent: 3644806 (1972-02-01), Belson
patent: 3673473 (1972-06-01), Werner
patent: 3728596 (1973-04-01), Hermansson et al.
patent: 3805131 (1974-04-01), Kappius
patent: 3910527 (1975-10-01), Buhler
patent: 3913866 (1975-10-01), Hankins
Braemar Computer Devices, Inc.
Dobeck B.
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