Speed control apparatus of hydraulic actuator

Details Speed control apparatus of hydraulic actuator Speed control apparatus of hydraulic actuator

1986-09-18

1988-02-09

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318696, G05B 1940

Patent

active

047243724

ABSTRACT:
The driving speed of a hydraulic actuator is feedback controlled by adjusting an amount of fluid by a digital valve having a valve which is opened and closed by a pulse motor. For speed control, the deviation between a set speed of the actuator which is set by a speed setting device and a detection speed of the actuator which is detected by a speed sensor is obtained. A pulse signal of a frequency proportional to the magnitude of the deviation is generated. When the deviation is positive, the pulse motor is driven using the pulse signal as a CW command pulse. When the deviation is negative, the pulse motor is driven using the pulse signal as a CCW command pulse. The rotational amount of the pulse motor is the integral of the pulse frequency which is proportional to the deviation.

REFERENCES:
patent: 3913833 (1975-10-01), Mimett et al.
patent: 4574686 (1986-03-01), Budzich
"Digital Valve Control System", Tokyo Keiki Company Ltd., pp. 50-54.
TD62803P "Stepping Motor Controller/Driver", Toshiba, pp. 245-250.
PMM8713 "Stepping Motor Driver", Sanyo Electric Company Ltd., pp. 8-12.

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