1.8° NEMA 8 Geared Stepper Motor with Planetary Gearbox

Geared stepper motors online are perfect solutions for low speed and high torque positioning applications. GEMS provide NEMA size stepper motors that are paired with planetary gearbox and spur gearbox. Our design incorporates a square bodied motor and an round shape planetary stepper motor gearbox into a compact and cost-effective package. Our geared stepper motors are offered in six NEMA frame sizes (from NEMA 8 to NEMA 42) and each NEMA size motor has an integrated stepper motor gearbox with a wide range of gear ratios (from 1:3.7 to 1:369) so as to deliver any desired torque and speed combinations for your applications. The dual shaft version is available for you to install the brake, shaft coupler or an encoder where you need to keep track of the shaft position. 8-lead motor is aslo available upon request for all possible wiring configurations: bipolar, unipolar, series, or parallel. For higher speed and better speed control capability, please check out our brushless gear motors.

 

1.8° NEMA 8 Geared Stepper Motor with Planetary Gearbox

NEMA8 is our smallest size of geared stepper motor. The 22mm diameter planetary stepper motor gearbox has gear ratio from 1:3.7 to 1:369. The gearbox output torque is up to 143 oz-in (1 Nm)

NEMA 8 geared stepper motor drawingNEMA8 stepper gearmotor

 

Table 1. Motor Specifications                  
Model Length L Rated Current Resistance Inductance Holding Torque Holding Torque Rotor Interia Lead wires Weight
  mm A Ω/Phase mH/Phase Oz.in N.m g.cm2   g
20HS30-0504Z 30 0.5 4.8 1.3 2.6 0.018 2.5 4 50
20HS42-0504Z 42 0.5 7.5 2.4 3.6 0.025 4.5 4 90
Table 2. Gearbox Specifications          
Number of gear trains   1 2 3 4
Gear ratio   3.7, 5.2 14, 19, 27 51, 71, 100, 139 189, 264, 369
Length L2 mm 24.4 33 41.5 49.8
Rated output torque N.m 0.6 1 1.6 2
Max output torque N.m 1.8 3 4.8 6
Efficiency % 90 81 73 66
Weight g 35 45 55 65
 

1.8° NEMA 11 Geared Stepper Motor with Planetary Gearbox

The 28mm diameter planetary stepper motor gearbox has gear ratio ranging from 1:3.7 to 1:369. The gearbox rated output torque is up to 286 oz-in (2 Nm)

NEMA 11 geared stepper motorNEMA11 stepper gearmotor

 

 

Table 1. Motor Specifications                  
Model Length L Rated Current Resistance Inductance Holding Torque Holding Torque Rotor Interia Lead wires Weight
  mm A Ω/Phase mH/Phase Oz.in N.m g.cm2   g
28HS33-0804Z 33 0.8 5.3 3.3 8.6 0.06 8 4 110
28HS45-0804Z 45 0.8 7.8 5.4 11.5 0.08 11 4 140
28HS48-0804Z 48 0.8 8.6 6.7 12.9 0.09 13 4 180

 A Basic Guide on Encoder Devices Operating