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Fuzzy logic controller

Created by: Tomas S. at: 5/3/2015 1:16 PM (5 Replies)

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5/3/2015 1:16 PM	Rate (0)
Tomas S. Posts: 8 Rating: (0)	Hi, I'm using fuzzy logic controller to drive servo drives via an inverter controlled through an industrial Profinet or Profibus interface, but task itself does not make sense to me. Fuzzy logic controller (FLC) I have designed, but it is not clear to me how the FLC to control servo drives use. Do you have someone with that experience?
Tomas S. Posts: 8 Rating: (0)	Last edited by: Tomas S. at: 11/15/2015 8:33:28 AM
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5/3/2015 2:08 PM	Rate (0)
casajr Posts: 153 Rating: (8)	Fuzzy Logic for a servo controller? No idea of your application, but fuzzy logic may not be the way to go. Fuzzy logic is great when the algorithm is not well understood, but the process and the result is. Then you can make some rules. Usually, a servo cycle has a well understood algorithm.
casajr Posts: 153 Rating: (8)
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5/3/2015 2:50 PM	Rate (0)
Davinator Gold Member Joined: 1/4/2013 Last visit: 11/1/2024 Posts: 1129 Rating: (102)	Tomas, forget fuzzy logic for controlling a servo. A servo motor needs rigorous closed loop control that is the opposite -pseudorandomic- of the fuzzy logic. So forget it, you won't obtain anything of useful.
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11/15/2015 8:38 AM	Rate (0)
Tomas S. Posts: 8 Rating: (0)	Davinator Tomas, forget fuzzy logic for controlling a servo. A servo motor needs rigorous closed loop control that is the opposite -pseudorandomic- of the fuzzy logic. So forget it, you won't obtain anything of useful. Hi, I found this document: http://www.industry.siemens.com/datapool/industry/industrysolutions/services/en/Fuzzy-Control-en.pdf , where it says that examples of its use include positioning as well as speed and distance control.
Tomas S. Posts: 8 Rating: (0)
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11/15/2015 1:10 PM	Rate (0)
Jeff Casagrande Posts: 1529 Rating: (202)	Still thinking about this after all of this time? 1. That software was discontinued years ago. 2. It may have worked for NON_LINEAR systems, but who knows. Before you re-invent the wheel, it is probably a good idea to know how a wheel works. I took a course in Neuro-Fuzzy back in the 1990's when it was being promoted as the next great thing. I was looking at applications of spray water cooling for slab casting machines, which are non-linear and mostly empirical. It went nowhere and, as the rest of the industry decided, was of little value. Applications at the time were for things that did not have a well understood end result, such as Cook Rice until it is DONE, wash clothes until they are CLEAN, adjust temperature so I am COMFORTABLE. Move axis 100mm is a very well understood result. Attached is the best example of a not well understood fuzzy controller. Forget about it unless this is a purely academic exercise, then waste all of the time you want. You have a solution looking for a problem to solve. Attachment Fuzzy Coffee.jpg (369 Downloads)
Jeff Casagrande Posts: 1529 Rating: (202)	Last edited by: Jeff Casagrande at: 11/15/2015 1:20:02 PM Last edited by: Jeff Casagrande at: 11/15/2015 1:36:58 PM Last edited by: Jeff Casagrande at: 11/15/2015 1:40:16 PM Last edited by: Jeff Casagrande at: 11/16/2015 10:02:01 AM
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This contribution was helpful to 2 thankful Users dchartier Gordon Shumway

10/30/2020 6:43 AM	Rate (0)
Jen_Moderator Diamond Member Joined: 6/19/2017 Last visit: 9/6/2024 Posts: 8175 Rating: (172)	New question published by andreshv is split to a separate thread with the subject Can a fuzzy driver be used on a Tia Portal v14 or another model?. Best regards Jen_Moderator

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