SR Series

SR Series

Electric Linear Actuator

  • Perfect for replacing ball screw actuators
  • For medium to high performance motion control
  • Provides a smaller package with higher speed
Find a Distributor

The SR Series is an obsolete product, no longer for sale. Need a comparable replacement, try our GSX Series Actuators.

In 2007 Exlar introduced the GSX Series Actuators as the successor to the SR Series. The difference between the GSX and the SR Series of actuators is shown below. For the details associated with these differences see the links at the bottom of this page or go to GSX overview.

Feature GSM SR
Connectors In-line for all sizes Side-by-side on SR31 and SR41
Length Shorter

For clevis mounting with the same pin to pin distance as the SR Series, select "Z" as the mounting option

Width

The GSM30 is narrower than the SR31

 

Side and trunnion mounting dimensions on the GSM30 are narrower than the SR31. The GSM20 and GSM40 side and trunnion mounting dimensions are the same as the SR21 and SR41

Backlash

0.008 inch
(0.2 mm)

0.004 inch
(0.1mm)

Coatings

Anodized

Anodized end caps, epoxy coated motor case

Excellent Ball Screw Replacement

The SR Series of linear actuators from Exlar provides a cost effective solution, perfect for replacing ball screw actuators. This compact design incorporates Exlar’s patented roller screw technology with an integral brushless servo motor for medium to high performance motion control applications. The SR Series offers a completely integrated actuator, competitively priced with low performance, short-lived ball screw actuators. The SR design provides a smaller package with higher speed and load capacity than ball screws and other traditional rotary to linear conversions. SR Series also offers 5 times the travel life of similarly sized ball screw actuators. Selection of the proper feedback configuration allows SR Series actuators to be powered by nearly every brand of brushless motor amplifier on the market. This flexibility allows SR Series actuators to be incorporated into the highest performance single and multi-axis motion control systems in use today. In applications varying from food and beverage packaging, to multi-axis turning centers to air-craft assembly, the SR Series of actuators show incredible performance and durability.

Features/Characteristics

  • 2.25, 3.3 and 3.9 inch frame sizes
  • 3, 5.9, 10 and 12 inch strokes
  • 0.1, 0.2, 0.4, 0.5 and .75 inch lead roller screws
  • 7 to 75 lbf-in torque motor availability
  • Up to 33 inch per second linear speeds
  • 92 to 1983 lbf thrust capacity depending on motor selection
  • IP54 or IP65 sealing
  • Front flange, rear clevis, trunnion, side, double side or extended tie rods mounting options
  • Encoder feedback with MS style connectors
  • Molded and shielded cables available
  • Black anodized and epoxy-coated aluminum housing
  • Competitive with low cost ball screw actuators
  • 5 times the life of a similar sized ball screw actuator
  • UL Class H insulation system compliant

Configuration Options

AR = External Anti-rotate Assembly

This option provides a rod and bushing to restrict the actuator rod from rotating when the load is not held by another method. Shorter actuators have single sided anti-rotation attachments. Longer lengths require attachments on both sides for proper operation.

High Temp Protective Bellows

This option provides an accordion style protective bellows to protect the main actuator rod from damage due to abrasives or other contaminants in the environment in which the actuator must survive. The high temperature material of this bellows is silicone coated fiberglass. This standard bellows is rated for environmental temperatures of -73 degrees to 288 degrees Celsius. Longer strokes may require the main rod of the actuator to be extended beyond standard length. Consult Exlar applications engineers for details.

L1, L2, L3 = Adjustable External Travel Switches

This option allows up to 3 external switches to be included with the SR Series actuator. These switches provide travel indication to the controller and are adjustable. Purchasing the anti-rotate option with external limit switches is required.

Motor Options

SR Motor options are described with a 3 digit code. The first digit calls out the stack length, the second the rated bus voltage, and the third the number or poles of the motor. Refer to the mechanical/electrical specifications for motor torque and actuator rated force.

All 8 Pole, Class 180 H

118 = 1 stack, 115 Vrms
138 = 1 stack, 230 Vrms
158 = 1 stack, 400 Vrms
168 = 1 stack, 460 Vrms
218 = 2 stack, 115 Vrms
238 = 2 stack, 230 Vrms
258 = 2 stack, 400 Vrms
268 = 2 stack, 460 Vrms

Motor Speed Designators

All Exlar T-LAMTM motors and actuators carry a standard motor speed designator as defined below. This is representative of the standard base speed of the motor, for the selected bus voltage.

Designator

Base Speed

Actuator/Motor Series

-50

5000 rpm

SR21

-40

4000 rpm

SR31

-30

3000 rpm

SR41

01-99

Special Speed, Consult Exlar

If the model number is created and the location for the motor speed designator is left blank, this is the base speed that each motor will be manufactured to. The model number can also be created including this standard speed designator.

Exlar also provides the flexibility to manufacture all of its T-LAM products with special base speeds to match the customer’s exact application requirements. This may be a higher than standard speed motor, or lower base speed than standard which will allow the customer to get the required torque, at a speed optimized to their application, and use the minimum amount of current from their amplifier.

The callout for a special speed is configured in the model number by using a two digit code from 01-99. These numbers represent the number, in hundreds, of RPM that will be the base speed for the particular motor.

For example, an SR-31-03-01-BSA-EM3-138-30 motor that normally has a 3000 rpm standard winding, can be changed to a 3300 rpm winding by changing the -40 to a -33. It can be changed to a 5000 rpm winding by changing the -40 to a -50.

Changing this speed designator will change the ratings of the motor, and these must be obtained from Exlar applications engineers. Also, it is not possible to produce every possible speed from 01-99 for each motor at each voltage, so please contact Exlar applications engineers for confirmation of the speed that is desired for the application.

PB = Protective Bellows

This option provides an accordion sytle protective bellows to protect the main actuator rod from damage due to abrasives or other contaminants in the environment in which the actuator must survive. The standard material of this bellows is neoprene coated nylon. This standard bellows is rated for environmental temperatures of -54 degrees to 121 degrees Celsius. Longer strokes may require the main rod of the actuator to be extended beyond standard length. Consult Exlar applications engineers for details.

PF = Preloaded Follower

This option offers a true zero backlash follower for the SR Series actuator. The dynamic load rating of zero backlash, preloaded screws is 63% of the dynamic load rating of the standard non-preloaded screws. The calculated travel life of a preloaded screw will be 25% of the calculated travel life of the same size and lead of a non-preloaded screw for the same application.

RB = Rear Electric Brake

This option provides a rear internal holding brake for the SR Series actuator. The brake is permanent magnet activated and electrically released. 24 VDC.

Rod End Attachments
  • Rear Clevis Pin
  • Spherical Rod Eye
  • Rod Eye
  • Rod Clevis
SR = Splined Main Rod

This option provides a main rod manufactured of ball spline shafting, and the front seal and bushing assembly replaced with a ball spline nut to provide the anti-rotate function without using an external mechanism. Rod diameters are the closest metric equivalents to standard Exlar rod sizes. This option is NOT sealed in any way. This option is not suitable for any environment in which contaminants come in contact with the actuator, and may enter the actuator.

XL = Non-Standard Lubrication

This option provides for indication in the model number that the customer has specified a lubrication other than the standard provided by Exlar.

XT = Special Travel Option Selections

The XT option can be used to specify various special travel options on the SR Series of Linear Actuators. Because this option can be used to specify many things, it is important that an order including the -XT option spell out in detail, the exact options being selected by the including of the -XT in the model number.

It is recommended that prior to ordering an actuator including the -XT specifier that a quote be obtained through Exlar’s special products application engineers for the desired options, and that quote be referenced on, or included with any order placed.

* Some options are not available with every configuration. For options or specials not listed above or for extended temperature operation, please consult Exlar Applications Engineering.

IP Ratings for Exlar Actuators

SR Series

SR21
Performance Specifications
 Printable View

SR21 SERIES PERFORMANCE SPECIFICATIONS

 

Model

Frame
Size
in (mm)

Stroke
in (mm)

Screw
Lead
in (mm)

Force Rating
1 Stack / 2 Stack
lb (N)

Max
Velocity
In/sec
mm (sec)

Approx*
Cont Motor
Torque
1 Stack / 2 Stack
lb-in (Nm)

Maximum
Static
Load
lb (N)

Armature
Inertia
Lb-in-s^2
(Kg-m^2)

Dynamic
Load
Rating
lb (N)

Weight
(approx)
lb (Kg)

SR21-0301

2.25
(57)

3
(76)

0.1
(2.54)

367/578
(1632/2571)

8.33
(211.67)

7.3/11.5
(0.82/1.30)

750
(3336)

0.00101
(0.000116)

1567
(6970)

6.5
(2.9)

SR21-0302

2.25
(57)

3
(76)

0.2
(5.08)

183/289
(814/1286)

16.77
(423.33)

7.3/11.5
(0.82/1.30)

750
(3336)

0.00101
(0.000116)

1219
(5422)

6.5
(2.9)

SR21-0304

2.25
(57)

3
(76)

0.4
(10.16)

92/145
(409/645)

33.33
(846.67)

7.3/11.5
(0.82/1.30)

750
(3336)

0.00101(0.000116)

738
(3283)

6.5
(2.9)

SR21-0601

2.25
(57)

6
(152)

0.1
(2.54)

367/578
(1632/2571)

8.33
(211.67)

7.3/11.5
(0.82/1.30)

750
(3336)

0.00114
(0.000131)

1567
(6970)

7.0
(3.2)

SR21-0602

2.25
(57)

6
(152)

0.2
(5.08)

183/289
(814/1286)

16.67
(423.33)

7.3/11.5
(0.82/1.30)

750
(3336)

0.00114
(0.000131)

1219
(5422)

7.0
(3.2)

SR21-0604

2.25
(57)

6
(152)

0.4
(10.16)

92/145
(409/645)

33.33
(846.67)

7.3/11.5
(0.82/1.30)

750
(3336)

0.00114
(0.000131)

738
(3283)

7.0
(3.2)

SR21-1201

2.25
(57)

12
(304)

0.1
(2.54)

367/578
(1632/2571)

8.33
(211.67)

7.3/11.5
(0.82/1.30)

750
(3336)

0.00143
(0.000165)

1567
(6970)

8.0
(3.6)

SR21-1202

2.25
(57)

12
(304)

0.2
(5.08)

183/289
(814/1286)

16.67
(423.33)

7.3/11.5
(0.82/1.30)

750
(3336)

0.00143
(0.000165)

1219
(5422)

8.0
(3.6)

SR21-1204

2.25
(57)

12
(304)

0.4
(10.16)

92/145
(409/645)

33.33
(846.67)

7.3/11.5
(0.82/1.30)

750
(3336)

0.00143
(0.000165)

738
(3283)

8.0
(3.6)

 

SR MECHANICAL / ELECTRICAL SPECIFICATIONS

 

SR21

 Nominal Backlash                     in   (mm)

0.004 (.10)

 Lead Accuracy           in/ft (mm/300 mm)

0.001 (.025)

 Maximum Radial Load                  lb  (N)

20 (90)

 Brake Holding Torque             lb-in (Nm)

19.4 (2.2)

 Environmental Rating: Standard/Optional

IP54

 

 Motor Stator

118

138

168

218

238

268

Trapezoidal Commutation Data

Continuous Motor Torque 
Lbf-in       

7.3

7.0

6.7

11.4

11.0

10.8

(Nm)

(0.82)

(0.79)

(0.76)

(1.29)

(1.24)

(1.22)

Torque Constant (Kt)
Lbf-in/A  

1.9

4.1

7.4

1.9

4.1

7.9

(N-M/A)

(0.22)

(0.46)

(0.84)

(0.22)

(0.46)

(0.89)

Cont. Current Rating, Greased
A

4.2

1.9

1.0

6.6

3.0

1.5

Peak Current Rating
A

8.4

3.9

2.0

13.2

6.0

3.0

RMS Sinusoidal Commutation Data

Continuous Motor Torque
Lbf-in 

7.6

7.3

7.0

11.9

11.5

11.3

(Nm)

(0.86)

(0.83)

(0.79)

(1.35)

(1.30)

(1.28)

Torque Constant (Kt) 
Lbf-in/A 

2.5

5.2

9.5

2.5

5.2

10.2

(N-M/A)

(0.28)

(0.59)

(1.07)

(0.28)

(0.59)

(1.15)

Cont. Current Rating, Greased   
A

3.4

1.6

0.8

5.4

2.5

1.2

Peak Current Rating   
A

6.9

3.1

1.6

10.8

4.9

2.5

Motor Stator Data

Voltage Constant (Ke) 
Vrms / Krpm 

16.9

35.6

64.9

16.9

35.6

69.4

VPK / KRPM

23.9

50.3

91.8

23.9

50.3

98.1

Pole Configuration

8

8

8

8

8

8

Resistance
(L-L) Ohms

2.6

12.5

45.8

1.1

5.3

20.7

Inductance
(L-L)  mH

5.1

22.8

75.8

2.5

11.0

41.7

Brake Current @ 24 VDC   
A

.33

.33

.33

.33

.33

.33

Brake Engage/Disengage Time
ms

14/28

14/28

14/28

14/28

14/28

14/28

Mech. Time Constant (tm), ms        MIN   
 

6.0

6.5

7.1

2.5

2.7

2.8

MAX

8.5

9.2

10.1

3.6

3.9

4.0

Electrical Time Constant (te)   
ms

2.0

1.8

1.7

2.2

2.1

2.0

Damping Constant   
lbf-in/krpm 
 

0.55

0.55

0.55

0.55

0.55

0.55

(N-M/KRPM)

(0.06)

(0.06)

(0.06)

(0.06)

(0.06)

(0.06)

Friction Torque 
lbf-in 
 

1.00

1.00

1.00

1.00

1.00

1.00

(N-M)

(0.11)

(0.11)

(0.11)

(0.11)

(0.11)

(0.11)

Bus Voltage    Vrms

115

230

460

115

230

460

Speed @ Bus Voltage
RPM

3000

3000

3000

3000

3000

3000

Motor Wire Insulation

Class 180 H

Motor Stator Rating

Class 180 H

Thermal Switch, case temp.     °C

100

Std. Connectors (S Option):          Motor

MS-3112-E16-8P

Feedback

MS-3112-E16-23P

Data Curves
Estimated Life Time Curves
SR31
Performance Specifications
 Printable View

SR31 Series Performance Specifications

 

Model

Frame Size in (mm)

Stroke in (mm)

Screw Lead in (mm)

Force Rating 1 Stack / 2 Stack lb (N)

Max Velocity in/sec mm (sec)

Approx* Cont Motor Torque 1 Stack / 2 Stack lb-in (Nm)

Maximum Static Load lb (N)

Armature Inertia Lb-in-s^2 (Kg-m^2)

Dynamic
Load Rating lb (N)

Weight (approx) lb (Kg)

SR31-0301

3.3
(84)

3
(75)

0.1
(2.54)

829/1347
(3688/5992)

5
(127)

16.5/26.8
(1.86/3.03)

1620
(7206)

0.00319
(0.000414)

3310
(14724)

9.5
(94.3)

SR31-0302

3.3
(84)

3
(75)

0.2
(5.08)

415/674
(1846/2998)

10
(254)

16.5/26.8
(1.86/3.03)

1620
(7206)

0.00319
(0.000414)


(15880)

9.5
(94.3)

SR31-0305

3.3
(84)

3
(75)

0.5
(12.7)

166/269
(738/1197)

25
(635)

16.5/26.8
(1.86/3.03)

1620    
(7206)

0.00319 (0.000414)

3016
(13416)

9.5
(94.3)

SR31-0601

3.3
(84)

5.9
(150)

0.1
(2.54)

829/1347
(3688/5992)

5
(127)

16.5/26.8
(1.86/3.03)

1620    
(7206)

0.00361 (0.000416)

3310
(14724)

11.5
(5.2)

SR31-0602

3.3
(84)

5.9
(150)

0.2 
(5.08)

415/674
(1846/2998)

10
(254)

16.5/26.8
(1.86/3.03)

1620    
(7206)

0.00361 (0.000416)


(15880)

11.5
(5.2)

SR31-0605

3.3
(84)

5.9
(150)

0.5
(12.7)

166/269
(738/1197)

25
(635)

16.5/26.8
(1.86/3.03)

1620    
(7206)

0.00361 (0.000416)

3016
(13416)

11.5
(5.2)

SR31-1001

3.3
(84)

10
(254)

0.1
(2.54)

829/1347
(3688/5992)

5
(127)

16.5/26.8
(1.86/3.03)

1620    
(7206)

0.00416 (0.000479)

3310
(14724)

19
(8.6)

SR31-1002

3.3
(84)

10
(254)

0.2
(5.08)

415/674
(1846/2998)

10
(254)

16.5/26.8
(1.86/3.03)

1620    
(7206)

 

0.00416 (0.000479)


(15880)

19
(8.6)

SR31-1005

3.3
(84)

10
(254)

0.5

(12.7)

166/269
(738/1197)

25
(635)

16.5/26.8
(1.86/3.03)

1620    
(7206)

0.00416 (0.000479)

3016
(13416)

19
(8.6)

SR31-1201

3.3
(84)

12
(305)

0.1
(2.54)

829/1347
(3688/5992)

5
(127)

16.5/26.8
(1.86/3.03)

1620    
(7206)

0.00443 (0.000510)

3310
(14724)

22
(10)

SR31-1202

3.3
(84)

12
(305)

0.2
(5.08)

415/674
(1846/2998)

10
(254)

16.5/26.8
(1.86/3.03)

1620   
(7206)

0.00443 (0.000510)


(15880)

22
(10)

SR31-1205

3.3
(84)

12
(305)

0.5
(12.7)

166/269
(738/1197)

25
(635)

16.5/26.8
(1.86/3.03)

 
(7206)

0.00443
(0.000510)

3016
(13416)

22
(10)

 

SR Series Mechanical / Electrical Specifications

Nominal Backlash  

in (mm)

0.004  (.10)

Lead Accuracy    

in/ft (mm/300 mm)

0.001  (25)

Maximum Radial Load        

lb (N)

15  (67)

Environmental Rating: Standard

IP54

 

 

SR31

SR41

MOTOR STATOR

118

138

168

218

238

268

118

138

168

218

238

268

Trapezoidal Commutation Motor Data

Continuous Motor Torque           Lbf-in

15.9

15.8

15.0

25.6

25.6

25.5

45.5

45.4

43.5

75.3

75.3

76.1

(Nm)

(1.79)

(1.78)

(1.70)

(2.89)

(2.89)

(2.88)

(5.14)

(5.13)

(4.91)

(8.51)

(8.51)

(8.60)

Torque Constant (Kt)              
Lbf-in/A

3.4

6.8

13.6

3.4

6.8

13.6

3.2

6.4

13.1

3.2

6.4

13.1

(N-m/A)

(0.39)

 (0.77)

(1.54)

(0.39)

(0.77)

(1.54)

(0.36)

(0.72)

(1.48)

(0.36)

(0.72)

(1.48)

Continuous Current Rating         Amps

5.2

2.6

1.2

8.4

4.2

2.1

15.9

7.9

3.7

26.3

13.1

6.5

Peak Current Rating                   Amps

10.4

5.2

2.5

16.8

8.4

4.2

31.7

15.8

7.4

52.5

26.3

13.0

RMS Sinusoidal Commutation Motor Data

Continuous Motor Torque           
Lbf-in

16.6

16.5

15.7

26.8

26.8

26.7

47.6

47.6

45.5

78.9

78.9

79.7

(Nm)

(1.88)

(1.87)

(1.78)

(3.03)

(3.03)

(3.01)

(5.38)

(5.37)

(5.14)

  (8.91)

(8.91)

(9.00)

Torque Constant (Kt)              
Lbf-in/A

4.4

8.7

17.5

4.4

8.7

17.5

4.1

8.2

16.8

4.1

8.2

16.8

N-m/A

(0.49)

(0.99)

(1.98)

(0.49)

(0.99)

(1.98)

(0.46)

 (0.93)

(1.90)

(0.46)

(0.93)

(1.90)

Continuous Current Rating         Amps

4.2

2.1

1.0

6.9

3.4

1.7

12.9

6.5

3.0

21.4

10.7

5.3

Peak Current Rating                   Amps

8.5

4.2

2.0

13.7

6.8

3.4

25.9

12.9

6.0

42.9

21.4

10.6

Motor Stator Data

Voltage Constant (Ke)    
Vrms / Krpm

29.9

59.7

119.5

29.9

59.7

119.5

28.1

56.1

114.8

28.1

56.1

114.8

Vpk / Krpm

42.2

84.5

168.9

42.2

84.5

168.9

39.7

79.4

162.4

39.7

79.4

162.4

Pole Configuration

8

8

8

8

8

8

8

8

8

8

8

8

Resistance (L-L)
Ohms

2.8

11.2

49.6

1.1

4.5

18.0

0.42

1.7

7.8

0.18

0.72

3.0

Inductance (L-L)
mH

7.7

30.7

123.0

3.7

14.7

5837

3.0

11.9

49.8

1.4

5.8

24.2

Mech. Time Constant (tm), ms
min

6.5

6.5

7.2

2.6

2.6

2.6

5.3

5.3

5.8

2.3

2.3

2.2

max

10.8

10.9

12.0

4.3

4.3

4. 4

7.7

7.7

8.4

3.3

3.3

3.2

Electrical Time Constant (te)  
ms

2.8

2.7

2.5

3.3

3.3

3.3

7.0

7.0

6.4

8.0

8.0

8.2

Damping Constant             
lbf-in/krpm

1.23

1.23

1.23

1.23

1.23

1.23

3.25

3.25

3.25

3.25

3.25

3.25

(N-m/Krpm)

(0.14)

(0.14)

(0.14)

(0.14)

(0.14)

(0.14)

(0.37)

(0.37)

(0.37)

(0.37)

(0.37)

(0.37)

Friction Torque 
lbf-in

2.00

2.00

2.00

2.00

2.00

2.00

4.50

4.50

4.50

4.50

4.50

4.50

(Nm)

(0.23)

(0.23)

(0.23)

(0.23)

(0.23)

(0.23)

(0.51)

(0.51)

(0.51)

(0.51)

(0.51)

(0.51)

Bus Voltage 
Vrms

115

230

460

115

230

460

115

230

460

115

230

460

Speed @ Bus Voltage
RPM

3000

3000

3000

3000

3000

3000

3000

3000

3000

3000

3000

3000

Thermal Switch, case temp. 
°C

100

100

100

100

100

100

100

100

100

100

100

100

Std. Connectors ("S" Option): Motor

MS-3112-E16-8P

MS-3102-E20-15P

Feedback

MS-3112-E16-23P

Motor Wire Insulation

Class 180 H

Motor Stator Rating

Class 180 H

Data Curves
Estimated Life Time Curves
SR41
Performance Specifications
 Printable View

SR41 Series Performance Specifications

 

Model

Frame Size in (mm)

Stroke in (mm)

Screw Lead in (mm)

Force Rating 1 Stack / 2 Stack lb (N)

Max Velocity in/sec mm (sec)

Approx* Cont Motor Torque 1 Stack / 2 Stack lb-in (Nm)

Maximum Static Load lb (N)

Armature Inertia lb-in-s^2 (Kg-m^2)

Dynamic
Load Rating lb (N)

Weight (approx) lb (Kg)

SR41-0601

3.9
(99)

(152)

0.1(2.54)

2393/3966 (10645/17642)

 5 (127)

47.6/78.9 (5.38/8.91)

3240 (14412)

0.0152 (0.001751)

4736 (21067)

20 (9.1)

SR41-0602

3.9
(99)

(152)

0.2 (5.08)

1196/1983 (5320/8821)

10 (254)

47.6/78.9 (5.38/8.91)

3240 (14412)

0.0152 (0.001751)

4890 (21751)

20 (9.1)

SR41-0605

3.9 (99)

(152)

0.5 (12.7)

479/793 (2131/3527)

25 (635)

47.6/78.9 (5.38/8.91)

3240 (14412)

0.0152 (0.001751)

4218 (18763)

20 (9.1)

SR41-0608

3.9 (99)

(152)

0.75 (19.05)

319/529 (1419/2353)

37.5 (953)

47.6/78.9 (5.38/8.91)

3240 (14412)

0.0152 (0.001751)

3328 (14804)

20 (9.1)

SR41-1201

3.9 (99)

12 (305)

0.1 (2.54)

2393/3966 (10645/17642)

(127)

47.6/78.9 (5.38/8.91)

3240 (14412)

0.0186 (0.002143)

4736 (21067)

32 (14.5)

SR41-1202

3.9 (99)

12 (305)

0.2 (5.08)

1196/1983 (5320/8821)

10 (254)

47.6/78.9 (5.38/8.91)

3240 (14412)

0.0186 (0.002143)

4890 (21751)

32 (14.5)

SR41-1205

3.9 (99)

12 (305)

0.5 (12.7)

479/793 (2131/3527)

25 (635)

47.6/78.9 (5.38/8.91)

3240 (14412)

0.0186 (0.002143)

4218 (18763)

32 (14.5)

SR41-1208

3.9 (99)

12 (305)

0.75 (19.05)

319/529 (1419/2353)

37.5 (953)

47.6/78.9 (5.38/8.91)

3240 (14412)

0.0186 (0.002143)

3328 (14804)

32 (14.5)

 

SR SERIES MECHANICAL / ELECTRICAL SPECIFICATIONS

Nominal Backlash    

in (mm)

0.004  (.10)

Lead Accuracy     

in/ft (mm/30 mm)

0.001  (25)

Maximum Radial Load    

lb (N)

15  (67)

Environmental Rating: Standard

IP54

 

 

SR31

SR41

MOTOR STATOR

118

138

168

218

238

268

118

138

168

218

238

268

Trapezoidal Commutation Motor Data

Continuous Motor Torque
Lbf-in

15.9

15.8

15.0

25.6

25.6

25.5

45.5

45.4

43.5

75.3

75.3

76.1

(Nm)

(1.79)

(1.78)

(1.70)

(2.89)

(2.89)

(2.88)

(5.14)

(5.13)

(4.91)

(8.51)

(8.51)

(8.60)

Torque Constant (Kt)
Lbf-in/A

3.4

6.8

13.6

3.4

6.8

13.6

3.2

6.4

13.1

3.2

6.4

13.1

(N-m/A)

(0.39)

(0.77)

(1.54)

(0.39)

(0.77)

(1.54)

(0.36)

(0.72)

(1.48)

(0.36)

(0.72)

(1.48)

Continuous Current Rating 
Amps

5.2

2.6

1.2

8.4

4.2

2.1

15.9

7.9

3.7

26.3

13.1

6.5

Peak Current Rating
Amps

10.4

5.2

2.5

16.8

8.4

4.2

31.7

15.8

7.4

52.5

26.3

13.0

RMS Sinusoidal Commutation Motor Data

Continuous Motor Torque
Lbf-in

16.6

16.5

15.7

26.8

26.8

26.7

47.6

47.6

45.5

78.9

78.9

79.7

(Nm)

(1.88)

(1.87)

(1.78)

(3.03)

(3.03)

(3.01)

(5.38)

(5.37)

(5.14)

  (8.91)

(8.91)

(9.00)

Torque Constant (Kt) 
Lbf-in/A

4.4

8.7

17.5

4.4

8.7

17.5

4.1

8.2

16.8

4.1

8.2

16.8

N-m/A

(0.49)

(0.99)

(1.98)

(0.49)

(0.99)

(1.98)

(0.46)

 (0.93)

(1.90)

(0.46)

(0.93)

(1.90)

Continuous Current Rating
Amps

4.2

2.1

1.0

6.9

3.4

1.7

12.9

6.5

3.0

21.4

10.7

5.3

Peak Current Rating Amps

8.5

4.2

2.0

13.7

6.8

3.4

25.9

12.9

6.0

42.9

21.4

10.6

Motor Stator Data

Voltage Constant (Ke)
Vrms / Krpm

29.9

59.7

119.5

29.9

59.7

119.5

28.1

56.1

114.8

28.1

56.1

114.8

Vpk / Krpm

42.2

84.5

168.9

42.2

84.5

168.9

39.7

79.4

162.4

39.7

79.4

162.4

Pole Configuration

8

8

8

8

8

8

8

8

8

8

8

8

Resistance (L-L)
Ohms

2.8

11.2

49.6

1.1

4.5

18.0

0.42

1.7

7.8

0.18

0.72

3.0

Inductance (L-L)
mH

7.7

30.7

123.0

3.7

14.7

5837

3.0

11.9

49.8

1.4

5.8

24.2

Mech. Time Constant (tm), ms
min

6.5

6.5

7.2

2.6

2.6

2.6

5.3

5.3

5.8

2.3

2.3

2.2

max

10.8

10.9

12.0

4.3

4.3

4. 4

7.7

7.7

8.4

3.3

3.3

3.2

Electrical Time Constant (te)
ms

2.8

2.7

2.5

3.3

3.3

3.3

7.0

7.0

6.4

8.0

8.0

8.2

Damping Constant
lbf-in/krpm 
 

1.23

1.23

1.23

1.23

1.23

1.23

3.25

3.25

3.25

3.25

3.25

3.25

(N-M/Krpm

(0.14)

(0.14)

(0.14)

(0.14)

(0.14)

(0.14)

(0.37)

(0.37)

(0.37)

(0.37)

(0.37)

(0.37)

Friction Torque
lbf-in

2.00

2.00

2.00

2.00

2.00

2.00

4.50

4.50

4.50

4.50

4.50

4.50

(Nm)

(0.23)

(0.23)

(0.23)

(0.23)

(0.23)

(0.23)

(0.51)

(0.51)

(0.51)

(0.51)

(0.51)

(0.51)

Bus Voltage
Vrms

115

230

460

115

230

460

115

230

460

115

230

460

Speed @ Bus Voltage
RPM

3000

3000

3000

3000

3000

3000

3000

3000

3000

3000

3000

3000

Thermal Switch, case temp. 
°C

100

100

100

100

100

100

100

100

100

100

100

100

Std. Connectors ("S" Option): Motor

MS-3112-E16-8P

MS-3102-E20-15P

Feedback

MS-3112-E16-23P

Motor Wire Insulation

Class 180 H

Motor Stator Rating

Class 180 H

Data Curves
Estimated Life Time Curves

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SR Series Drawings

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SR21
SR21 All Mounts
SR31
SR31 All Mounts
SR31 Front Flange with Anti-Rotate Option
SR41
SR41 All Mounts
Options/Accessories
SR Rod Ends
SR External Limit Switch

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