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

ASDA-B3

6.2.5 Electronic gear ratio (E-Gear ratio)

The electronic gear provides easy settings for the resolution. The resolution of the servo drive is
24-bit, which means 16,777,216 pulses are generated per motor revolution. 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 the servo drive.
When the E-Gear ratio is 1, it means 16,777,216 pulses are generated per motor revolution;
when the E-Gear ratio is 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.
For example, if the workpiece is moved at the speed of 1 μm/pulse after you set a proper
E-Gear ratio, 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
E-Gear is
not applied
E-Gear is
applied
Refer to Chapter 8 for detailed descriptions of the relevant parameters.
Parameter
P1.044
P1.045
Gear ratio
1
=
1
16777216
=
3000
Moving distance per 1 pulse command
μm
3000
1
rev
= × =
pulse
1 16777216
16777216
rev
μm
3000
16777216
rev
×
=
pulse
3000
16777216
rev
Function
E-Gear ratio - numerator N1
E-Gear ratio - denominator M
3000 μm
(Unit: )
pulse
μm
= 1 (Unit: )
pulse
Control Mode
6
6-9