Ball Screw; Disc Table; Belt & Pulley - YASKAWA SGM series User Manual

APPLICATIONS OF Σ-SERIES PRODUCTS
3.2.5 Using Electronic Gearc ont.
3
82
3) Examples of Setting an Electronic Gear Ratio for Different Load Mechanisms

Ball Screw

Reference unit: 0.001 mm
Load shaft
Ball screw
Incremental
pitch: 6 mm
encoder:
2048 pulses per revolution

Disc Table

Reference unit:
0.1°
Load shaft
Incremental encoder:
2048 pulses per revolution
Belt & Pulley
Reference unit: 0.0254 mm
Load shaft
Gear ratio:
Pulley diameter:
2.4 : 1
100 mm
Absolute encoder:
1024 pulses per revolution
4) Control Block Diagram for SGDA-jjjP Servopack for Position Control
SGDA Servopack for position control
Reference
pulse
PG signal
output
Travel distance per
revolution of load shaft

B
Electronic gear ratio
A
Travel distance per
revolution of load shaft
Gear ratio:
3 : 1
Electronic gear ratio
Preset
values
Travel distance per
revolution of load shaft
Electronic gear ratio
= 9830.4 = 49152
12362 61810
Differ- Feed-forw Primary
ard gain lag filter
entiation
Smoot
Error
hing
counter
Frequency
dividing
6mm
= 6000
=
0.001mm

= 2048 × 4 × 1 = Cn-24
6000 × 1 Cn-25
Preset
Cn-24 8192
values
Cn-25
6000
360°
=
= 3600
0.1°
 
= 2048 × 4 × 3 = Cn-24
B
3600 × 1
A Cn-25
Cn-24
24576
Cn-25 3600
= 3.14 x 100mm
= 12362
0.0254mm
 
B = 1024 × 4 × 2.4 = Cn-24
A 12362 × 1 Cn-25
Preset
49152
Cn-24
values
61810
Cn-25
Bias
COIN
signal
SGM
Servomotor
Current
Speed
loop
loop
Encoder