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???
12/10/05 13:26
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 		 #105034 - Re: Sp.
Responding to: ???'s previous message
Dear Steve,

Thanks for your reply,


Like I said, steppers are nasty for this, if you have positonal feedback, can't you use DC drives instead ? This is why CNC machines use DC drives.


This project is not going for production it is one off automation project. The customer has already purchased steppers and drives for it so not possible to go fot DC now. For this project I will somehow manage by using damper and for future projects i will make sure not to use steppers with encoders.

Can AC motors with a VFD be used with encoders to make a closed loop system or its only DC thats works good.

Thanks & Regards,
Prahlad Purohit

List of 63 messages in thread
TopicAuthorDate
shaft encoder & HCTL2032 with stepper.            01/01/70 00:00      
   2032 clock            01/01/70 00:00      
      Re: 2032 Clock.            01/01/70 00:00      
   Correct Freq.            01/01/70 00:00      
      discusses the clocking            01/01/70 00:00      
         and one more            01/01/70 00:00      
   Clock = 32MHz still decoder cheating.            01/01/70 00:00      
      Damper ?            01/01/70 00:00      
         Re: Damper.            01/01/70 00:00      
            Sp            01/01/70 00:00      
               Re: Sp.            01/01/70 00:00      
                  closed loop systems            01/01/70 00:00      
                     and            01/01/70 00:00      
                  What is the reason for vibration?            01/01/70 00:00      
                     Re: Vibration Source.            01/01/70 00:00      
                        Vibration or resonance..?            01/01/70 00:00      
                           Stepper motor action            01/01/70 00:00      
                              Exactly...            01/01/70 00:00      
                                 OK            01/01/70 00:00      
                                    ringing            01/01/70 00:00      
                                       depends on factors            01/01/70 00:00      
                                       Just visualize any mechanical drive stop            01/01/70 00:00      
                        Possible tests            01/01/70 00:00      
                           Bummer isn't it ?            01/01/70 00:00      
      I know this, but has not seen it with tr            01/01/70 00:00      
         lower the clock            01/01/70 00:00      
            exactly            01/01/70 00:00      
               Re: Exactly.            01/01/70 00:00      
      errors            01/01/70 00:00      
         oscillation            01/01/70 00:00      
   Not Sure.            01/01/70 00:00      
      what does the scope say?            01/01/70 00:00      
         oscillator            01/01/70 00:00      
   Tried Frequencies from 25kHz to 33MHz.            01/01/70 00:00      
      you have something defective            01/01/70 00:00      
         Mechanics            01/01/70 00:00      
            I agree            01/01/70 00:00      
               any mechab=nical, however bad should giv            01/01/70 00:00      
                  Sloppy            01/01/70 00:00      
         RE: defective.            01/01/70 00:00      
            did you forget the mistletoe?            01/01/70 00:00      
               Re: offload.            01/01/70 00:00      
                  I mixed up 2 HCTLxxx chips.            01/01/70 00:00      
   Why encoder?            01/01/70 00:00      
      Reference            01/01/70 00:00      
         absolute encoder            01/01/70 00:00      
            expensive.            01/01/70 00:00      
               absolute encoders            01/01/70 00:00      
               the real problem with absolute encoders            01/01/70 00:00      
                  Nah            01/01/70 00:00      
      Re: Why Encoder.            01/01/70 00:00      
   Encoder with stepper            01/01/70 00:00      
   Problem Solved.            01/01/70 00:00      
      "Solved" ?            01/01/70 00:00      
         Re: Resonance.            01/01/70 00:00      
      "problem solved" does not jive            01/01/70 00:00      
         Re: Misleading encoder.            01/01/70 00:00      
            HCTL-2032 encoder counting problem            01/01/70 00:00      
   Torsion Damper.            01/01/70 00:00      
      Capture ?            01/01/70 00:00      
         Stepper motor with shaft encoder            01/01/70 00:00      
         Re: Capture.            01/01/70 00:00      
   Stepper motor            01/01/70 00:00      

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