Download 080916_Class_01

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.