Process requirements of straight wire-drawing machine:
■ motor can load startup, the startup torque required to achieve the rated torque 150%;
■Motor can load stability of low speed and stable operation, convenient threading;
■ need the tension of arbitrary speed (up to 20 m / s) into the mold is stability;
■ the maximum total compression rate is 85%, the average compression rate of 20%;System scheme:
■ by PLC according to the metal flow balance principle calculated main speed, real time allocated to the inverter through bus method (maximum transmission speed of 12 m / s);
■ master speed can basically meet the needs of the production process of the speed difference, then the signal of the displacement sensor detection feedback to the frequency converter for PID computing, fine-tuning the amount added to the main speed, control the tension is stability when the wire into the mold;
■effective control the amount of adjustment of PID, make sure the swinging arm is stable under arbitra
ry velocity or deceleration condition, significantly reducing the probability of broken wire;
■ a special PID function, PID parameter can follow the speed change generate infinite set of PID parameters, to achieve precise control under different speeds;the advantages of this system:
■the frequency of the source of flexible combinations of ST7800 converter (main speed +PID), special control of PID makes the swing arm is more stable, especially at low speed;
■ the real current vector control, big low frequency torque, fast response, ensured that the system has good tracking performance;
■ strict quality control and scientific manufacturing process, greatly improved the reliability, and the maintenance cost is also greatly reduced;Application: straight line wire drawing machine drawing machine, the pulley type drawing machine, wire drawing machine