Actuator controller using periodic signal

Details Actuator controller using periodic signal Actuator controller using periodic signal

1998-07-10

1999-05-18

Masih, Karen

Electricity: motive power systems

Positional servo systems

Frequency- or phase-modulated systems

318560, 318567, G05B1/02

Patent

active

059053518

ABSTRACT:
An actuator controller using a periodic signal includes: an actuating unit for moving a movable portion with respect to a fixed portion by a predetermined amount; a drive unit for operation the movement; a power supply unit for supplying an electric power to the drive unit; and a periodic signal generating unit, which includes a velocity command signal generating part for generating a velocity command signal on the basis of an output of the movable portion, and a driving frequency calculating part for determining the frequency of the periodic signal in accordance with the velocity command signal. The driving frequency calculating part comprises: a digital control calculating part for deriving a control pulse signal frequency f for moving the movable portion; a stochastic output calculating part for calculating an output by a probability on the basis of the frequency f and a sampling frequency fs, or an error correcting part for correcting an error of the frequency; and a frequency quantizing part for quantizing the frequency, the error of which has been corrected. With this construction, it is possible to smoothly and accurately control the movable portion of the periodic signal drive system even if there is a little memory capacity, and it is possible to achieve a precise movement.

REFERENCES:
patent: 4091294 (1978-05-01), Zanki et al.
patent: 5647477 (1997-07-01), Morishita

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