AD2S1210 resolution setting

Hello

             Customer would like to meet 16000rpm ( 266.6rps). Do you have any suggestion or comments for 12bit or 14 bit resolution that more suitable for this specification?  It looks max rps of 12 bit and 14 bit should meet 266.6 rps. Thank you. 

 

Xtal:8.192Mhz

Pole pair: 4

Speed: 16000rpm (266.6rps)

       

BR

Patrick

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  • +1
    •  Analog Employees 
    on Oct 26, 2020 11:12 AM 1 month ago

    Patrick,

    Can you comment on if the speed quoted already accounts for the speed multiplier of the pole pair (electrical speed) or if it is the mechanical speed of the monitored shaft?  Also is there a requirement for overspeed indication?

    Thanks  

    Sean

  • Hello Sean

                   The speed ex 16000rpm should be mechanical speed. Customer's motor is 4 Pole-Pairs. the resolver is 2 Pole-Pairs. So at motor run  a cycle, we should get SIN/COS speed become double, is it correct? Please refer to below waveform. above pic is  4 Pole-Pairs, below pic is 2 Pole Pairs. 

                    if correct, the motor run one cycle, the resolver get speed from 16000 rpm to 32000 rpm. If consider resolution setting, we need to depend 32000 rpm for our resolution setting, right? 

                     It is a little urgent, so need your help to clarify above questions, Thank you. 

    BR
    Patrick

Reply
  • Hello Sean

                   The speed ex 16000rpm should be mechanical speed. Customer's motor is 4 Pole-Pairs. the resolver is 2 Pole-Pairs. So at motor run  a cycle, we should get SIN/COS speed become double, is it correct? Please refer to below waveform. above pic is  4 Pole-Pairs, below pic is 2 Pole Pairs. 

                    if correct, the motor run one cycle, the resolver get speed from 16000 rpm to 32000 rpm. If consider resolution setting, we need to depend 32000 rpm for our resolution setting, right? 

                     It is a little urgent, so need your help to clarify above questions, Thank you. 

    BR
    Patrick

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