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Electronic Gear Ratio Calculation<br />
Follow the Steps below:<br />
1. Define the requirements of the positioning system<br />
Establish the following:<br />
Move distance per one revolution of load shaft.<br />
Servo motor Encoder ppr (Pulse Per Revolution). (please refer to section 1-1-2 Servo Motor Standards).<br />
Motor / load Shaft deceleration ratio.<br />
2. Move distance per one move <strong>com</strong>mand pulse.<br />
Define the move distance caused by the transmission system as a result of, one move <strong>com</strong>mand pulse from<br />
the host controller.<br />
Ex: When 1 Pulse Command move = 1μm<br />
If the Host Controller gives a move <strong>com</strong>mand of 2000 pulses, the transmission device will move by: -<br />
2000pulse × 1um/pulse = 2mm (The Electronic Gear Ratio must be set correctly).<br />
3. Calculate the Electronic Gear Ratio<br />
Calculate the Electronic Gear Ratio according to the formula below:-<br />
Electronic Gear Ratio =<br />
Encoder ppr ( Pulse Per Revolution) x 4<br />
Move distance per load shaft revolution ÷ Move distance per <strong>com</strong>mand Pulse<br />
If the deceleration ratio between motor and load shaft is<br />
(m = Motor Rotating number , n= Load Shaft Rotating Value), Then the formula for Electronic Gear Ratio is:<br />
n<br />
m<br />
Encoder ppr ( Pulse Per Revolution) x 4<br />
Electronic Gear Ratio =<br />
Move distance per load shaft revolution ÷ Move distance per <strong>com</strong>mand Pulse<br />
X<br />
m<br />
n<br />
Warning!<br />
The calculated Electronic Gear Ratio must be according to the conditions below,<br />
otherwise the servo drive and motor will not function correctly.<br />
1<br />
200<br />
≤ Electronic eGearRatio ≤<br />
200<br />
5-38
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