Three-point type position control method based on slide distance

Abstract

This invention relates to a three-point type position control method based on slide distance. Wherein, setting the value variation to divide the control process into two stages: first, comparing the new set value Wo with real width, modifying it as Wo+2So or Wo-2So (or more large for real condition); second, when the error more than 2So, taking position control by original value. By This invention, the probability that the number of rotation and counter-rotation is within 3 can be more than 80%.

Description

technical field [0001] The invention relates to a position control method of a mobile device driven by a three-phase AC asynchronous motor, in particular to a position control method based on a sliding (pre-stop) distance. Background technique [0002] For equipment driven by three-phase AC asynchronous motors, such as blast furnace charging trolleys, side guide plates in front of rolling mills, etc., by controlling the forward and reverse rotation of the AC motor, the mechanical transmission mechanism converts the rotation of the motor into a change in displacement. Feedback, compared with a set position to achieve position control of these mobile devices. [0003] Such as figure 1 Shown: The existing hot rolling rough rolling production line is composed of four stands, each stand is composed of side guide plate 4 (SideGuide), vertical roll 1 (Edger), horizontal roll 3 (Rougher), and the side guide plate is used to guide The slab enters and exits the frame along the cente...

AI Technical Summary

Problems solved by technology

[0023] 2. During the debugging process, we found that the swing phenomenon mostly occurs when the actual position is close to the target position; that is, when the short-distance deviation occurs, it is easy to cause control uncertainty

Because the static friction that needs to be overcome at the start is uncertain, it is related to the mechanical lubrication situation at that time, the coupling status of gears and worm gears and other transmission mechanisms, so a in the formula t=SQR(S / a) In fact, it changes, so the speed change and control time after overcoming static friction are not reproducible

[0024] 3. Hysteresis of the transmission actuator

Therefore, the detection of the position and the calculation of the time are very accurate and fast, and the response speed of the control is also quite fast, but the output signal passes through the hysteresis of the relay and the electrical equipment, which may easily cause the asynchronous control signal and the actual action, resulting in swing phenomenon

Images