How many pulses per revolution (PPR) should I specify?！

• That is very much dependent upon the application.
• When interfacing an encoder to a drive for speed feedback, the drive manufacturer will typically specify an optimal PPR, or a maximum frequency by maximum motor speed in revolutions per second.
• How to calculate pulses per revolution rate for a given frequency input limit and maximum motor or shaft RPM.
• RPM / 60 = RPS (revolutions per second)

  Example A:
  Max. frequency: 10,000 Hz. Max. motor speed: 1700 RPM / 60 = 28 RPS
  10,000 Hz / 28 RPS = 357 PPR nearest standard PPR to be used is 360 for this example.

• How to calculate frequency output of an encoder given the PPR and maximum motor or shaft RPM.

  Example B:
  Max. motor speed is 3600 RPM / 60 = 60 RPS. Encoder PPR is 1024
  Max. frequency output of encoder at 3600 RPM. 60 RPS x 1024 PPR = 61,444 Hz.

• In Example A, a 360 PPR encoder would work perfectly. If the desired PPR is not listed among the standard/stock items, then select the next lower value, or Changchun Rongde encoder factory.
• When selecting an encoder for positioning accuracy, calculate the needed resolution by converting the physical accuracy required of the load (say 0.001") to the amount of rotation seen by the encoder (through the gearbox, if any) (example: 1°). Calculate the minimum PPR = 360/ (movement in degrees) x 2 = 720 PPR. Ideal PPR = minimum x 5 = 3600 PPR.
• Select an encoder between minimum and ideal values, keeping in mind any possible frequency limitations on the input device (see Example A).
• The default PPR for most new applications worldwide is 1024 PPR - high enough to give accuracy, but low enough not to overflow most recent drives and controls with too many pulses per second. 1024 PPR encoders are in-stock by most manufacturers and distributors worldwide, which makes them an easy choice.

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