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Richard Erlacher
02/02/09 07:35
Read: 615 times
Denver, Co
USA


 
#161943 - Perhaps you're looking at the wrong motor
Responding to: Satish S Munot's previous message
What determines the speed of the system? What is its exact speed? Which motor is the governing factor? How stabile (how much short-term and long-term variation is there, e.g. in femtoradians/second per terafortnight) is its speed over time? How precise must the relationship be (30%, 3%,, 20 ppm 3 ppb, 1/10^50)? How much loop delay can the system tolerate, i.e. must the second motor track within a microsecond or two, or can it wait, say two minutes before settling? ... how about half an hour?

It's often easier to divide a frequency rather than to multiply. Moreover, if the two motors must remain in precise synchronization, perhaps it's easier to control them from a common frequency reference.

RE

List of 23 messages in thread
TopicAuthorDate
Frequency Multiplication      Satish S Munot      01/31/09 02:01      
   what is the wave form shape of the original signal?      Joe Gold      01/31/09 05:34      
   Yes, PLL is the most promising solution      Richard Erlacher      01/31/09 09:08      
   Easy integer approximation      Jerson Fernandes      01/31/09 19:02      
      Yes, but      Joe Gold      01/31/09 20:50      
         Wave Shape      Satish S Munot      02/01/09 20:25      
            Constant speed?      Per Westermark      02/01/09 22:49      
            Constant speed?      Per Westermark      02/01/09 22:50      
            Constant speed?      Per Westermark      02/01/09 22:51      
            Constant speed?      Per Westermark      02/01/09 22:51      
            Still some outstanding questions      Joe Gold      02/02/09 06:12      
            Perhaps you're looking at the wrong motor      Richard Erlacher      02/02/09 07:35      
   Rate Multiplier      Aubrey Kagan      02/02/09 13:17      
      That might work ... but ...      Richard Erlacher      02/02/09 13:26      
         Frequency multiplier      Satish S Munot      02/02/09 21:11      
            How about some numbers?      Richard Erlacher      02/02/09 21:39      
               Frequency Multiplier      Satish S Munot      02/03/09 01:21      
                  I was afraid that was the case ...      Richard Erlacher      02/03/09 08:56      
                     Frequency Multipllication      Satish S Munot      02/03/09 20:46      
                        What about that logic card?      Richard Erlacher      02/03/09 22:19      
                           Frequency Multipiler      Satish S Munot      02/03/09 22:24      
                              Why no further relevant information?      Richard Erlacher      02/03/09 22:28      
                                 I have been following this      Erik Malund      02/04/09 05:55      

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