Aiming at weakness of the former excitation system of ball - mill machine synchronous motor in mill run factory , succeeds in digitization reconstruction for the excitation system by applying advanced siemens 6ra70 rectifier , s7 - 300 plc and profibus - dp fieldbus technique , constructs automation network of the workshop , and acquires better technique and economic benefit 摘要針對選礦廠球磨機同步電機原勵磁系統的缺點,運用西門子6ra70整流器、 s7 ~ 300plc及profibus - dp現場總線技術對勵磁系統進行了數字化改造,構建了車間自動化網絡,取得了良好的技術和經濟效益。