Editing Quadrature
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[[File:Quadrature Diagram.svg|thumb|Digital quadrature signals]] | [[File:Quadrature Diagram.svg|thumb|Digital quadrature signals]] | ||
− | Quadrature digital signals consists two channels (wires) and it can carry incremental | + | Quadrature digital signals consists two channels (wires) and it can carry incremental reference or feedback signal. Quadrature signal is commonly seen in optical encoders which is probably the most common feedback device type in modern servo motors. Quadrature signal can be also used as [[reference signal]] and it has similar properties with [[pulse and direction]]. |
==Operation== | ==Operation== | ||
Each edge of signal (from A or B channel) will increment or decrement quadrature counter value by one. | Each edge of signal (from A or B channel) will increment or decrement quadrature counter value by one. | ||
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Most optical encoder specify their resolution as pulses per revolution (PPR) which will equal 4X amount of position values per revolution. I.e. 1000 PPR encoder will yield resolution of 4000 counts per revolution. | Most optical encoder specify their resolution as pulses per revolution (PPR) which will equal 4X amount of position values per revolution. I.e. 1000 PPR encoder will yield resolution of 4000 counts per revolution. | ||
==Encoder PPR, CPR, LPR and resolution== | ==Encoder PPR, CPR, LPR and resolution== | ||
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Most encoder suppliers specify quadrature encoder resolution as PPR (pulses per revolution) or LPR (lines per revolution). This specifies how many electrical pulses (0 to 1 transitions) there will be during one revolution. Some manufacturers (such as Avago and USdigital) uses name CPR (counts per revolution) to specify pulses per revolution which may seem counter-intuitive. | Most encoder suppliers specify quadrature encoder resolution as PPR (pulses per revolution) or LPR (lines per revolution). This specifies how many electrical pulses (0 to 1 transitions) there will be during one revolution. Some manufacturers (such as Avago and USdigital) uses name CPR (counts per revolution) to specify pulses per revolution which may seem counter-intuitive. | ||
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===Glossary=== | ===Glossary=== | ||
− | ;PPR | + | ;PPR |
:Pulses per revolution | :Pulses per revolution | ||
− | ;LPR | + | ;LPR |
:Lines per revolution (same as PPR) | :Lines per revolution (same as PPR) | ||
;CPR | ;CPR | ||
− | :Counts per revolution. Usually means encoder resolution after 4X decoding. However, some manufacturers (such as Avago and USdigital) | + | :Counts per revolution. Usually means encoder resolution after 4X decoding. However, some manufacturers (such as Avago and USdigital) PPR value as CPR. |
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