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5-4-3 Electronic Gear<br />
Electronic gear ratio parameter can be used to scale the <strong>com</strong>mand output pulse.<br />
This would be useful in transmission applications where move distance per move <strong>com</strong>mand pulse<br />
has to be scaled due to mechanical requirements.<br />
Diagram and notes below describe the electronic gear ratio effect.<br />
Example of a transmission device and calculations that show the required number of pulses from a<br />
host controller to move the table by 10mm.<br />
Encoder pulse per<br />
revolution(PPR)=2000<br />
Screw Pitch = 5mm. (Move distance for<br />
1revolution of screw)<br />
Calculations without Electronic Gear Ratio<br />
Calculations with Electronic Gear Ratio<br />
1.One rotation of ball screw = Table move distance of For Calculating the number of pulses <strong>com</strong>mand required,<br />
5mm.<br />
Setting of Electronic gear ratio see next chapter.<br />
2. If the table is required to move 10mm, then Ball Electronic gear ratio can be set according to the required<br />
screw needs to rotate by (10mm ÷ 5 mm/rev)= 2 move distance per move <strong>com</strong>mand pulse.<br />
Revs<br />
For example:<br />
3. Command pulses required to cause one revolution:- 1. One Pulse <strong>com</strong>mand = Move distance of 1μm.<br />
= Encoder ppr × ( Internal multiplication factor). 2. If the Motion Table needs to move 10mm,<br />
= 2000 ppr x 4 = 8000 pulses.<br />
Then the required <strong>com</strong>mand pulses from a Host Controller<br />
4.So the Command pulses required to move 10mm (2 is<br />
revs):-<br />
= 10mm ÷ 1μm / Pulse.= 10000 Pulses.<br />
= 8000 pulses x 2 ( revs) = 16000 Pulses.<br />
Once the move distance per pulse and the Electronic<br />
gear ratio is known then the required number of pulse<br />
Number of <strong>com</strong>mand pulses for an specific move <strong>com</strong>mand can be calculated.<br />
distance can be calculated according to the formula<br />
below:<br />
= Number of Ball Screw Revs x (Encoder ppr x 4).<br />
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