Electricity: motive power systems – Positional servo systems – Digital or numerical systems
Patent
1988-09-01
1989-10-10
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
Digital or numerical systems
318608, 318618, G05B 106
Patent
active
048734772
ABSTRACT:
The actuator has a displacement detector and is driven intermittently through a given displacement. A mean amount of drive signals per one intermittent drive such as a mean duration of drive signals and a mean number of drive pulse signals is calculated through a predetermined number of intermittent drives. The mean amount of drive signals is intermittently applied to the actuator for a given number of intermittent drives without the displacement detection. After the given number of intermittent drives by the calculated mean amount, another intermittent drive with the displacement detection is carried out. At this time, the total duration of the drive pulse signals or number of the drive pulse signals outputted until the completion of the given displacement is compared with the calculated mean amount. If the difference therebetween is greater than a given value, the number of intermittent drives by the mean amount is reduced, or if the difference is much greater, the predetermined number of intermittent drives are carried out once again to calculate an updated mean amount. On the other hand, the difference is smaller than the given value, the number of intermittent drives by the mean amount is increased.
REFERENCES:
patent: 3684874 (1972-08-01), Kelling
patent: 3708657 (1973-01-01), Kelling
patent: 3889105 (1975-06-01), Schneckloth
patent: 3911346 (1975-10-01), Schneckloth
patent: 3967177 (1976-06-01), Scholten et al.
patent: 4170751 (1979-10-01), Stricker
patent: 4529922 (1985-07-01), Ono
Adams Bruce L.
Ip Paul
Seiko Instruments Inc.
Shoop Jr. William M.
Wilks Van C.
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