Servomotor feedback fault detector
AssigneeSperry Corporation
InventorDale D. Davidson
Life of this patent
Estimating the term…
Abstract
A servo motor feedback fault detector that combines the motor drive voltage, the current flowing through the motor and the rotational speed of the motor and compares this combined signal with a dynamic threshold generated by combining a percentage tolerance of the motor current with a percentage tolerance of the motor rotational rate.
Claims9
A feedback fault detector for a servomotor, said motor being responsive to a drive voltage applied thereto and having an electrical resistance value associated therewith and having tachometer means coupled thereto for providing a tachometer signal proportional to the rate of rotation of said motor, comprising
- first combining means responsive to said drive voltage, to the current flowing through said motor as a result of said drive voltage applied thereto and to said tachometer signal for providing a combined signal in accordance with a linear combination thereof,
- second combining means responsive to said current and to said tachometer signal for providing a threshold signal in accordance with a linear combination thereof, and
- decision means responsive to said combined signal and to said threshold signal for providing a fault detected signal when said combined signal exceeds said threshold signal.
Dependencies are inferred from the claim text.