Beckwith Electronics


Hamburg, Illinois 62045
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Hurst Manufacturing


RAS & RBS Series High Torque, Permanent Magnet Stepping Motors HIGH TORQUE, STEPPING MOTORS:
RAS and RBS Series
HIGH TORQUE, PERMANENT MAGNET STEPPING MOTORS

Designed specifically to combine greater torque and small size, RAS and RBS stepping motors meet many industrial and instrument requirements. Standard 7.5 step angle motors have a torque rating at 4-5 p/s of 23 ounce-inches. The Hi-Torque model is rated at 29 ounce-inches. Models with 15 step angles are rated, respectively, 13 and 17 ounce-inches.

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. Click here for standard lead wire color code and switching sequence.
2. Hurst Stepping Motor Controllers may be used to drive RAS and RBS motors up to 500 ma per phase.


Direct Drive 7.5o or 15o Step Angle DC Stepping Motors
Model Part
Number
Stock
Item
Step
Angle
(degrees)
Steps
Per
Revolution/TH>
2-Phase
Holding
Torque
(oz-in)
Rated
Torque
@ 4-5 p/s
(oz-in)
Input
Power
(watts)
Nominal
Voltage
(volts)
Winding
Resistance
(ohms)
Rotor
Inertia
(oz-in)
Temperature
Rise
(oC)
Weight
(oz)
RAS 3903-001   7.5 48 33 23 12 12 24 0.92 55 26
RAS 3906-001   7.5 48 37 29 12 12 24 0.92 55 26
RAS 3903-002   7.5 48 33 23 12 6 6 0.92 55 26
RAS 3903-003   7.5 48 33 23 12 24 96 0.92 55 26
RBS 3904-001   15.0 24 24 13 12 12 24 0.92 60 26
RBS 3907-002   15.0 24 27 17 12 12 24 0.92 60 26
RBS 3904-002   15.0 24 24 13 12 6 6 0.92 60 26
RBS 3904-003   15.0 24 24 13 12 24 96 0.92 60 26
* Measured with no heat sink, motor in a holding mode with 2 phases energized.
Bold face listings indicate Hi-Torque rotor.