New Control Strategy In Tandem Cold Mill With Ac Drives

The gage accuracy of strip coil in the tandem cold mills has much possibility of improvement with the advanced control techniques. In conventional dc motor mill drives, however, the limit on speed control response makes it difficult to achieve the higher accuracy in the gage control. The circulating current cycloconverter-fed squirrel cage induction motor drive system with entirely digital control scheme has been employed at Mizushima No.2 tandem cold mil for the purpose of improvement in the gage accuracy.