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Rotary Servomotors

Yaskawa was the first company to mass produce servomotors employing a segmented stator design. This process uses individually wound stator segments that are grouped together, press fit into the motor body, and impregnated with resin. The result is improved heat transfer, dramatic reduction in motor size and cost, and the best quality and reliability available. Yaskawa has leveraged this technology to become the largest servomotor manufacturer in the world and produced the 7,000,000th AC servomotor in 2009.

The Sigma family of servomotors has taken the next technological step using high-resolution serial encoder feedback. Position information is transmitted to the amplifier allowing full error checking which eliminates position error caused by electrical noise and prevents runaway conditions. This all-digital feedback design enables the amplifier to automatically recognize the motor and optimize settings.

Comparison of Rotary Servomotors

Motor Parameters | Amplifier Voltage | Encoder Options | Miscellaneous Options | Amplifier

Motor Parameters
Sigma-5 Series
Sigma II Series
Mini
Rotary Motor
Direct Drive Motor
Sizes Within Series
5
8
11
8
17
6
5
10
6
2
5
2
Rated Torque
lb-in
[N-m]
21
[2.39]
28.1
[3.18]
844
[95.4]
197
[22.3]
1770
[200]
21
[2.39]
42
[4.77]
845
[95]
140
[15.8]
43
[4.9]
3100
[350]
0.56
[0.064]
Peak Torque
lb-in
[N-m]
74
[8.36]
84.5
[9.55]
1983
[224]
478
[54]
5310
[600]
63
[7.1]
126
[14.3]
1988
[224]
422
[47.6]
190
[21.5]
6120
[700]
1.68
[0.19]
Rated Speed
[rpm]
3000
3000
1500
3000
150-200
3000
3000
1500
3000
6000
1500
3000
Max Speed
[rpm]
6000
6000
3000 (1)
5000
250-500
5000
5000
3000 (1)
5000
6000
2000
5000
Power Range
[kW]
0.75
1.0
15
7
3
0.75
1.5
15
5
3
55
0.2
IP Rating (excluding shaft)
IP65
IP65
IP67
IP67
IP42
IP55
IP67
IP67
IP67
IP67
IP44 (2)
IP55
Inertia
Medium
Low
Medium
Low
High
Low
Medium
Medium
Low
Low
High
Low
Flange Size
in
[mm]
1.57-3.15
[40-80]
1.57-3.15
[40-80]
3.54-8.66
[90-220]
[100-130]
5.31-14.17 (4)
[135-360]
1.57-3.35
[40-85}
2.36-4.72
[60-120]
5.12-8.66
[130-220]
3.94-5.12
[100-130]
4.57-6.10
[116-155]
9.84-11.8 (3)
[250-300]
0.98
[25]
Notes:
(1) 11kW and 15kW models have 2000 rpm max speed.
(2) Includes shaft.
(3) Largest size (55kW) is foot-mounted.
(4) SGMCS dimension is overall motor diameter in millimeters.
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Amplifier Voltage
Sigma-5 Series
Sigma II Series
Mini
24VDC
                      
■
100VAC, 1-phase
       
□
□
□
          
200VAC, 1-phase
■
■
□
□
■
■
□
□
      
200VAC, 3-phase
■
■
■
■
■
□
□
■
■
      
480VAC, 3-phase
   
■
■
   
■
■
■
■
  
Symbol Key:
■ Applies to entire product line
□ Applies to only part of the product line.
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Encoder Options
Sigma-5 Series
Sigma II Series
Mini
Incremental
ppr5
 1048576 1048576 1048576 1048576 1048576 8192 8192 131072 131072 131072 131072 8192
Absolute
ppr5
 1048576 1048576 1048576 1048576 1048576 65536 65536 131072 131072 131072 131072  
Notes:
(5) ppr is the resolution in pulses per revolution as seen by the controller (post quadrature).
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Misc. Options
Sigma-5 Series
Sigma II Series
Mini
Holding Brake Available
■
■
■
■
■
■
■
■
■
■
■
Shaft Seal Available
■
■
■
■
■
■
■
■
■
■
  
Gearbox Available
             
■
■
      
NEMA Flange Available
           
□
          
Symbol Key:
■ Applies to entire product line
□ Applies to only part of the product line.
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Amplifier
Sigma-5 Series
Sigma II Series
Mini
SGDV Sigma-5
■
■
■
■
■
              
SGDH Sigma II
       
■
■
■
■
■
■
■
  
SGDG LEGEND
       
■
■
■
□
□
      
SGDF Sigma Mini
                     
■
Symbol Key:
■ Applies to entire product line
□ Applies to only part of the product line.
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