How should the AC Analysis of a DC servo look like - diyAudio
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Old 13th February 2012, 08:04 PM   #1
Bensen is offline Bensen  Belgium
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Default How should the AC Analysis of a DC servo look like


There are a lot of threads where there is spoken of DC-servo's, but unfortunately non of them (not the ones I found) are mentioning how the AC analysis should look like. So,

Bob Cordell is showing in his book how a poorly designed DC servo looks like (Page 166). I'm asking myself than how the AC analysis of a good DC servo should look like.

My thinking:
1 Enough gain at low frequency (below 1Hz)
2 Gain dropping fast at higher freq (above 1Hz)
3 As close as possible to 90(integrator) of phase shift at the point where the gain is 0.
4 High impedance at output and input

What are your remarks to the AC analysis below? Is this any good?

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File Type: jpg DC servo 20120213.JPG (130.8 KB, 49 views)
File Type: jpg DC servo AC analysis 20120213.JPG (192.4 KB, 48 views)
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