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Example 1:
Calculate the resolution of the rotary encoder when it is directly connected to the conveyor shaft.
<Calculation condition>
● Dot font: 5 x 7 dots (horizontal 5, vertical 7)
● Space between characters: 1 dot (1 scan)
● Inter-character interval: 1.8 mm [horizontal 6 dots (6 scans)]
(Inter-character dot 5 + Space between characters 1)
● Diameter of the conveyor pulley: 60 mm
(1) Distance the conveyor moves per revolution of the rotary encoder:
60 mm x 3.14 = 188.4 mm/revolution
(2) Number of scans that must be performed while the conveyor is moving 1 mm:
6 scans/1.8 mm = 3.33 scans/mm
(3) Required resolution of the rotary encoder (number of output pulses per revolution of the encoder):
188.4 mm/revolution x 3.33 scans/mm = 628PPR (≈ 2,500PPR, pulse rate division factor: 4)
Diameter of the conveyor pulley
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