NEMA 23 Planetary Gearbox Stepper: This big geared stepper motor has a frame size 57-56mm with rated current 2.8a, integrated with a PG series planetary gearbox that has a wide range of gear ratio 4 to 77. It is an ideal choice for the applications that require high torque or low speed but high precision motion control.
NEMA 23 Planetary Gearbox Stepper Specification

- Part Number: 57AI56-2804S-PGXX
- Step Angle: 1.8deg w/o gearbox
- Bi/Unipolar: Bipolar
- Holding Torque: 1.2Nm w/o gearbox
- Rated Current/phase: 2.8A
- Frame Size: 57x57mm
- Motor Length: 56mm
- Number of Leads: 4
- Lead Length: 500mm
- Gearbox Type: Planetary
- Gear Ratio: 4-77:1
- Efficiency: 90%-70%
- Backlash at No-load: 1deg-2deg
- Gearbox Length: 48mm-72mm
- Shaft Diameter: Φ12mm
- Shaft Length: 30mm
- Keyway Length: 20mm
- Stepper Drive: DM542
Overall Size

Gearbox Length(L)=48mm for ratio 4/1; 60mm for ratio 15/1; 72mm for ratio 47/1, 47/1
Motor 4 Leads Connection: A+(Black), A-(Green); B+(Red), B-(Blue)
If you need a PDF data sheet, please send the email to: info@frankhumotor.com!
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