Electronic Gear Ratio Setting Examples - YASKAWA SGD7S Product Manual

5.15.2

Electronic Gear Ratio Setting Examples

Setting examples are provided in this section.
• Rotary Servomotors
Step Description
Machine
1
Specifications
2 Encoder Resolution
3 Reference Unit
Travel Distance per
4 Load Shaft Revolution
(Reference Units)
5 Electronic Gear Ratio
6 Parameters
• Linear Servomotors
A setting example for a Serial Converter Unit resolution of 256 is given below.
Step Description
1 Linear encoder pitch
2 Reference Unit
3 Electronic Gear Ratio
4 Setting Parameters
Machine Configuration
Ball Screw
Reference unit: 0.001 mm
Load shaft
Encoder: Ball screw lead:
Load shaft
24 bits 6 mm
• Rotation angle per revo-
• Ball screw lead: 6 mm
lution: 360°
• Gear ratio: 1/1
• Gear ratio: 1/100
16,777,216 (24 bits) 16,777,216 (24 bits)
0.001 mm (1 μm)
0.01°
6 mm/0.001 mm =
360°/0.01° = 36,000
6,000
B 16,777,216 1 B
×
=
A 6,000 1 A
Pn20E: 16,777,216 Pn20E: 167,772,160
Pn210: 6,000 Pn210: 3,600
Machine Configuration
Reference unit:
0.02 mm (20 m)
Forward direction
0.02 mm (20 μm)
0.001 mm (1 μm)
1 (μm)
B
× 256
=
A 20 (μm)
Pn20E: 256
Pn210: 20
5.15 Electronic Gear Settings

5.15.2 Electronic Gear Ratio Setting Examples

Rotary Table Belt and Pulley
Reference unit: 0.005 mm
Reference unit: 0.01°
Gear ratio:
1/100
Gear ratio:
1/50
Encoder: 24 bits
• Pulley dia.: 100 mm
(Pulley circumference:
314 mm)
• Gear ratio: 1/50
16,777,216 (24 bits)
0.005 mm (5 μm)
314 mm/0.005 mm =
62,800
16,777,216 100 B
×
=
=
A
36,000 1
Pn20E: 838,860,800
Pn210: 62,800
Load shaft
Pulley dia.:
100 mm
Encoder: 24 bits
16,777,216 50
×
62,800 1
5
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