The problem of calibrating speed

chenbingjy

The problem of calibrating speed [Copy link]

I am now working on a testing machine to calibrate the speed. The microcontroller drives the stepper motor driver to control the speed of the cylinder.

There is also a fuel tank. Now there is a problem, the speed is not proportional, so a coefficient is calibrated.

Then control the speed of the oil cylinder and set the speed to 0.5mm/s, 1mm/s, 2mm/s.

As a result, the speeds of the cylinders are not proportional, not in the ratio of 1:2:4.

I don't know why. Please give me some advice, thank you!

chunyang

The information is seriously incomplete and cannot be judged. The structure and working principle of the non-circuit part must be clarified first. The circuit is only auxiliary. The characteristics of the controlled object and the relationship between the physical quantities must be clarified first.

huo_hu

What is not proportional to what? If it is not proportional, there should be a relationship.

chenbingjy

huo_hu posted on 2019-9-11 15:21 What is not proportional to what? If it is not proportional, there should be a relationship

The key is not knowing the relationship.

huo_hu

chenbingjy posted on 2019-9-11 15:24 The key is not knowing the relationship.

Take the data to fit one, but it is better to analyze the principle