Electronic Gear Ratio (E-Gear Ratio) - Delta ASDA-B3 Series User Manual

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6.2.5 Electronic gear ratio (E-Gear ratio)

The electronic gear provides easy settings for the resolution. The resolution of ASDA-B3 is

24-bit, which means that it generates 16,777,216 pulses per motor rotation. Regardless of the

encoder resolution (17-bit, 20-bit, or 22-bit), the E-Gear ratio is set according to the 24-bit

resolution of ASDA-B3 servo drive.

When the E-Gear ratio is 1, it generates 16,777,216 pulses per motor rotation. When you set

the ratio to 0.5, then every two pulses from the command (controller) corresponds to one pulse

for the motor. However, larger E-Gear ratio might create a sharp corner in the profile and lead to

a high jerk. To solve this problem, apply an S-curve command filter or a low-pass filter to reduce

For example, if you set the E-Gear ratio so that the workpiece is moved at the speed of

1 μm/pulse, then it means the workpiece moves 1 μm per pulse.

(1) Motor; (2) Ball screw pitch: 3 mm (equals 3,000 μm); WL: workpiece; WT: platform

Refer to Chapter 8 for detailed descriptions of the relevant parameters.

Moving distance per 1 pulse command

E-Gear ratio (numerator) (N1)

E-Gear ratio (denominator) (M)

Operation Mode

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