How does the vector control inverter control the tension in speed mode? -Solutions - Huaqiang Electronic Network

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The tension closed-loop control in speed mode achieves constant tension by adjusting the motor speed. Firstly, the synchronous matching frequency command is calculated in real time by the line speed of the belt (line) and the winding diameter of the reel, and then the tension signal and the tension setting value fed back by the tension detecting device constitute a PID closed loop, and the frequency command of the inverter is adjusted.

The formula for synchronous matching frequency instructions is as follows:

F=(V×p×i)/(π×D)

Where: F——the inverter synchronizes the frequency command;

V——material line speed;

P——the number of poles of the motor (the inverter is automatically obtained according to the motor parameters);

i - mechanical transmission ratio;

D——roll diameter of the reel

The brands of the inverters are different, the usage of the designers is different, and the ways to obtain the above variables are different, especially the linear velocity (V) of the material and the winding diameter (D) of the reel, and the calculation methods are various.

In this control mode, the PID adjustment performance of the inverter is required to be good, and the synchronous matching frequency command should be accurate, so that the system is more stable and stable, otherwise the system will be unstable and unstable. This mode is often used in the continuous drawing of the wire drawing machine and the continuous rolling drive control of the rolling mill. If the torque control mode is adopted, when the mechanical properties of the material fluctuate, it is difficult to draw the wire, and the rolling mill does not move or the like.