The article describes composition of hydraulic control system of lifting device,and adoption of moment-location feedback control to perform displacement and positioning of work piece in correct way.

The application of ISP technology and ISP deviceson position feedback module in service system;

In this paper, a general controlling system for step-motor based on P89C662, was introduced, which can control step-motor with different phases or power, handle step-motor’s position feedback and communicate with several modes.

According to the operating characteristics of ultrasonic motors,several PID position feedback control methods have been implemented and compared.

Maneuvering and vibration damping of flexible spacecraft using adaptive variable structure control and suboptimal positive position feedback;

Based on positive position feedback,a method for active vibration control of a steel pylon structure using piezoelectric sensors and actuators,is proposed.

i Aiming at heavy flow control under high pressure situation, simple structu.

And expatiates on the dual position feedback idea and point out that the idea can make the electromagnetic to resist the high frequency disturbance of the track.