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Permanent Magnet DC Stepper Motor Family
Series RAS, RBS Direct Drive Stepper
Permanent Magnet DC Stepper Motor RAS, RBS Direct Drive Specifications:
Step Angle: 7.5° & 15°
Position Accuracy: +/- 5% max.
Number of Phases: 4 phase bifilar
Insulation Class: Class A (105°C)
Lead Wire: 6 leads (approx. 12 inches [304.8 mm])
Operation Ambient Temp: -10°C to +40°C (approx.)
Shaft Bearing: Sleeve or Ball Bearing Available
Note:  Typical data subject to change without notification
Additional Information:

Designed specifically to combine greater torque and small size, the RAS and RBS stepping motors meet many industrial and instrument requirements. Standard 7.5° & 15° step angle motors have a torque rating at 4-5 p/s of 23 ounce-inches [162.4 mN-m]. The Hi-Torque model is rated at 29 ounce-inches [204.8 mN-m].

Dual sleeve bearings are standard, ball bearings may be specified. Double-ended shafts also are available.

Notes:
1. Standard RAS and RBS direct drive motors have 4-phase bifilar windings (6 lead wires) and unipolar operation.

RAS, RBS Direct Drive Drawings:
RAS, RBS Direct Drive Diagrams:
RAS, RBS Direct Drive Model Table:
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Model Part Number Nom.
Voltage
(Vdc)
Step
Angle
(deg)
Steps
per
Rev
Rated
Torque
@
4-5 p/s
(oz-in)
Rated
Torque
@
4-5 p/s
(mN-m)
Holding
Torque
(oz-in)
(2 Phase Energized)
Holding
Torque
(mN-m)
(2 Phase Energized)
Full
Load
Temp
Rise
(deg C)
Input
Power
(watts)
Winding
Res.
(ohms)
Rotor
Inertia
(oz-in2)
Rotor
Inertia
(gm-cm2)
Weight
(oz)
Weight
(g)
RAS 3903-001 12 7.5 48 23 162 33 233 55 12 24 .92 168.3 26 737.1
RAS 3906-0011 12 7.5 48 29 205 37 261 55 12 24 .92 168.3 26 737.1
RAS 3903-002 6 7.5 48 23 162 33 233 55 12 6 .92 168.3 26 737.1
RAS 3903-003 24 7.5 48 23 162 33 233 55 12 96 .92 168.3 26 737.1
RBS 3904-001 12 15 24 13 91.8 24 169.5 60 12 24 .92 168.3 26 737.1
RBS 3904-002 6 15 24 13 91.8 24 169.5 60 12 6 .92 168.3 26 737.1
RBS 3904-003 24 15 24 13 91.8 24 169.5 60 12 96 .92 168.3 26 737.1
RBS 3907-0021 12 15 24 17 120 27 190.7 60 12 24 .92 168.3 26 737.1

Notes:
1 Hi-Torque Rotor Construction.