control systems <tons of questions>

Thread Starter

MegaMan

Joined Sep 25, 2009
53
Hi , getting control systems < studying Mechatronics Engineering , i will post a question from time to time >

the professor said that the feedback should be negative , why ?

 

Papabravo

Joined Feb 24, 2006
21,094
It must be negative because otherwise the system and the amp would continue in the same direction until the amplifer reached it's limit and destroyed itself or the system began to oscillate. The purpose of feedback is to reduce the error at the output of the summation block (aka the summing junction).
 

hgmjr

Joined Jan 28, 2005
9,027
The only way to drive the error term to zero is to subtract two quantities. Hence negative feedback.

hgmjr
 
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