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Transcript
This course is mainly motor control. There are only two labs. Oct 2nd, and Oct 23rd. Test on Oct 30th Final November 20th Motor Control ‐ Usually one of several standard nominal system voltages. eg. 120/240 3‐Wire. 208/120, 460/277 "Y" 240, 480, 600 V ‐ Maximum current is set by the wire size. ‐ Fuse or breaker limits the current. ‐ Other Courses go more into detail on this. Starting: ‐ Only copper resistance limits current in a stationary motor. ‐ Power must be added in a controlled way to protect the system. ‐ Other courses go more into detail on this. Speed Control: ‐ It is not always needed. ‐ Many times motors run at a specific speed at all times. ‐ If control is needed, it is different between AC voltage and DC voltages. ‐ General speaking, DC systems vary the voltage, and AC systems vary the frequency. ‐ This is not feedback. ‐ Covered in this course. Motor: ‐ The motor reacts to electrical energy (Voltage & Current) by producing mechanica; energy (torque on turning shaft) ‐ There are relationships between electrical values and mechanical values. ‐ Covered in this course. Speed measurement/feedback: ‐ If load varies, and speed must be fixed, feedback is used to smooth operations. ‐ No details in this course. Serial Communications ‐ RS232 ‐ USB ‐ Mostly a theory course. ‐ Practical hook up in other courses.