Electrical Engineering 101: Everything You Should Have Learned in School...but Probably Didn't (w/ CD)

Author:Ashby, Darren [Ashby, Darren]
Language: eng
Format: mobi
Publisher: Newnes
Published: 2008-11-23T16:00:00+00:00

Figure 4.14. Block diagram of speed feedback.

Though it is generally a good idea to feed back the signal you want to control, there could be times you do not have that luxury, or maybe there are reasons you do not want to use speed feedback. If this is the case, you can use another speed control approximation called IR compensation—see Figure 4.15 on next page. This is a method in which you monitor the load on the motor by sensing the current through the motor. The loss due to heat is proportional to this current. If you know the resistance of the motor, you can calculate how much voltage turns into heat, never making it to the output shaft. Add this much voltage to the input to the motor and you have a fairly good approximate speed control and you didn't need a tachometer!

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