Patent · US Expired

Controller for a lockable servo motor

US4408148A · kind A · utility

13Cited by
5References
4Claims
0Family size

Assignee

Inventor

Key dates

Filing dateNov 16, 1981
Grant dateOct 4, 1983
Priority date—
Expiry dateNov 16, 2001

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG05B11/42
  • WIPO fieldControl
  • WIPO sectorInstruments

Abstract

The PI controller for a blockable servo motor comprises a selector having a first, normal operating position in which a difference signal is fed to the I network. In the other position, the output of a subtraction member is fed to the I network. The inputs of the subtraction member receive the input and output of the servo motor. The selector is actuated by means of a comparator which also blocks the servo motor when the difference signal is of small absolute value. In this way, the servo motor is not operated as frequently and yet this does not appreciably impair the control accuracy.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.