ASDA-B3 Operation Mode
6-9
6
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
the jerk.
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
μ
m); WL: workpiece; WT: platform
Gear ratio
Moving distance per 1 pulse command
E-Gear is
not applied
=
1
1
=
3000
μm
rev
16777216
pulse
rev
×
1
1
=
3000
16777216
(Unit:
μm
pulse
)
E-Gear is
applied
=
16777216
3000
=
3000
μm
rev
16777216
pulse
rev
×
16777216
3000
= 1 (Unit:
μm
pulse
)
Refer to Chapter 8 for detailed descriptions of the relevant parameters.
Parameter
Function
P1.044
E-Gear ratio (numerator) (N1)
P1.045
E-Gear ratio (denominator) (M)
Содержание ASDA-B3 Series
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