机电数控英语

Unit 1 DC MotorsUnit 2 Principles of OperationUnit 3 Closed Loop Speed and Position Control of DC MotorsUnit 4 Programmable Logic Controller (Part Ⅰ)Unit 5 Programmable Logic Controller (Part Ⅱ)Unit 6 Programmable Logic Controller (Part Ⅲ)Unit 7 AC Adjustable Speed Drives (ASD's) ⅠUnit 8 AC Adjustable Speed Drives (ASD's) ⅡUnit 9 AC Adjustable Speed Drives (ASD's) ⅢUnit 10 PLCsUnit 11 Hydraulic BasicsUnit 12 Hydraulic SystemsUnit 13 Pump and Motor SectionUnit 14 Fluid Power Systems