Current closed-loop control box tension closed-loop control works - Database & Sql Blog Articles

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1. Tension closed loop control:
1) If it is DC speed regulation, the tension detecting mechanism will use the tension electric signal to control the conduction angle of the thyristor. When the tension is large, the conduction angle becomes smaller, the DC voltage decreases, the motor speed decreases, and the tension does not increase; Conversely, when the tension is small, the conduction angle becomes large, the DC voltage increases, the motor speed increases, and the tension does not decrease;
2) If it is AC speed regulation, the tension detecting mechanism will use the tension electric signal to control the frequency of the inverter. When the tension is large, the frequency will become smaller, the speed of the AC motor will decrease, and the tension will not increase. Conversely, when the tension is small, the frequency will become larger. When the speed of the AC motor increases, the tension will not decrease;
2. Current closed loop control:
1) If it is DC speed regulation, the motor current detecting mechanism will control the conduction angle of the thyristor with the detection electric signal. When the tension is large, the motor load increases the current, the conduction angle becomes smaller, the DC voltage decreases, and the motor speed decreases. The tension will not increase the motor current will not increase; conversely, when the tension is small, the motor load is small, the conduction angle becomes large, the DC voltage increases, the motor speed increases, and the tension does not decrease the motor current. small;
2) If it is AC speed regulation, the motor current detection mechanism will use the detection electric signal to control the frequency of the inverter. When the tension is large, the motor load increases, the current increases, the frequency becomes smaller, the AC motor speed decreases, and the tension does not increase the motor. The current does not increase; conversely, when the tension is small, the motor load has a small current, the frequency becomes large, the speed of the AC motor increases, and the tension does not decrease the motor current does not decrease;