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Home / Common Planetary Geared Motor

Planetary Gearbox Stepper Motor

What is planetary gearbox?

A planetary gear is a type of epicyclic gear system comprised of spur gears. In planetary gearing (also known as epicyclic gearing), a center gear, called a sun gear, serves as the input and driver of the set. Three or more “driven” gears (referred to as planets) rotate around the sun gear within a planetary gearbox. Finally, the planets engage with a ring gear from the inside, which makes an internal spur gear design. Because the planet gears are evenly distributed around the sun gear, planetary gear trains are known to be extremely rugged designs. Another benefit of a planetary gearset is that it is easy to convert to a different ratio by simply changing out the carrier and sun gears.

A planetary gearset uses spur gears that move opposite of each other within the same plane. While spur gears are a more basic type of gear in terms of engineering since they do not utilize specialty angles or cuts like bevel or herringbone gearing, they are complex in the tooth shape design. Depending on the application, this tooth design will determine where the teeth make contact, which then determines the available power, torque, and speed potential of the gears.
nema 11 stepper motor with gearbox

NEMA 11 Hybrid Stepper Motor with Common Planetary Gearbox

Stepper motor, small size, high torque, low noise, step angle: 1.8°, NEMA11, 28x28mm
Gear Ratio: 1 Stage:  4/5/7/10:1 
2 Stage: 16/20/25/28/30/35/40/45/50/70/100:1 
3 Stage: 64/80/100/125/140/175/200:1
Optional: Lead-wires, gearbox, encoder, brake, integrated drivers...
Model Step Angle Phase Shaft Wires Body Length Current Resistance Inductance Holding Torque Leads No. Rotor Inertia Weight
(°) / / / (L)mm A Ω mH N.cm No. g.cm2 Kg
BF28HS32-0674 1.8 2 Round Directwires 32 0.67 5.6 3.4 6 4 9 0.11
BF28HS45-0674 1.8 2 Round Directwires 45 0.67 6.8 4.9 9.5 4 12 0.14
BF28HS51-0674 1.8 2 Round Directwires 51 0.67 9.2 7.2 12 4 18 0.2

NEMA 11 BF-HPR28 L Series Common Planetary Gearbox Specification

Model / BF-HPR28-L1 BF-HPR28-L2 BF-HPR28-L3
Gear Ratio / 4 5 7 10 16 20 25 28 30 35 40 45 50 70 100 64 80 100 125 140 175 200
Gear Trains / 1 2 3
Gearbox Length mm 53 61 69
Rated Torque N.m 2 2 2 1 4 4 4 4 4 4 4 4 3 3 3 6 6 6 6 6 6 6
Sundden Stop Torque N.m 4 4 4 2 8 8 8 8 8 8 8 8 6 6 6 12 12 12 12 12 12 12
Back Lash arcmin ≤15 arcmin ≤20 arcmin ≤25 arcmin
Efficiency % 96 94 90
Suitable Motor Dimension mm Φ5-10 / Φ22-2.5 / F23-M2.5
Rated Input Speed rpm 1000
Max Input Speed rpm 2000
Average Life Span h 20000
Axial Force N 100
Radial Force N 300
Noise dB ≤55
Protection Level IP IP54
Work Temp. ℃ -20 to + 150
Out Shaft Type / D-cut Type
nema 14 planetary gearbox stepper motor

NEMA 14 Hybrid Stepper Motor with Common Planetary Gearbox

Stepper motor, small size, high torque, low noise, step angle: 0.9° or 1.8°, NEMA14, 35x35mm
Gear Ratio: 1 Stage: 3/4/5/6/7:1
2 Stage: 9/15/20/25/30/35:1
3 Stage: 45/100/120/140/150/175/210:1
Optional: Lead-wires, gearbox, encoder, brake, integrated drivers...
Model Step Angle Phase Shaft Wires Body Length Current Resistance Inductance Holding Torque Leads No. Rotor Inertia Weight
(°) / / / (L)mm A Ω mH N.cm No. g.cm2 Kg
BF35HS28-0504 1.8 2 Round Direct wire 28 0.5 20 14 10 4 11 0.13
BF35HS34-1004 1.8 2 Round Direct wire 34 1 2.7 4.3 14 4 13 0.17
BF35HS42-1004 1.8 2 Round Direct wire 42 1 3.8 3.5 20 4 23 0.22

NEMA 14 BF-HPR35 L Series Common Planetary Gearbox Specification

Model / BF-HPR35-L1 BF-HPR35-L2 BF-HPR35-L3
Gear Ratio / 3 4 5 6 7 9 15 20 25 30 35 42 45 100 120 140 150 175 210
Gear Trains / 1 2 3
Gearbox Length mm 60 69.5 79
Rated Torque N.m 6 7 6.5 5 5 8 9 8.5 8.5 7 7 7 10 9 9 9 8.5 8.5 8.5
Sundden Stop Torque N.m 12 14 13 10 10 16 18 17 17 14 14 14 20 18 18 18 17 17 17
Back Lash arcmin ≤15 arcmin ≤20 arcmin ≤25 arcmin
Efficiency % 96 94 90
Suitable Motor Dimension mm Φ5-10 / Φ22-2 / F26-M3
Rated Input Speed rpm 1000
Max Input Speed rpm 2000
Average Life Span h 20000
Axial Force N 100
Radial Force N 270
Noise dB ≤55
Protection Level IP IP54
Work Temp. ℃ -20 to + 150
Out Shaft Type / Key Shaft Type
nema 17 geared stepper motor

NEMA 17 Hybrid Stepper Motor with Common Planetary Gearbox

Stepper motor, high torque, low noise, smooth type, step angle: 1.8° or 0.9°, NEMA17, 42x42mm
Gear Ratio: 1 Stage: 4/5/10:1
2 Stage: 20/25/50/100:1
Optional: Lead-wires, gearbox, encoder, brake, integrated drivers...
Model Step Angle Phase Shaft Wires Body Length Current Resistance Inductance Holding Torque Leads No. Rotor Inertia Weight
(°) / / / (L)mm A Ω mH N.cm No. g.cm2 Kg
BF42HM34-1334 0.9 2 Round Lead wire 34 1.33 2.1 4.2 22 4 35 0.22
BF42HM40-1684 0.9 2 Round Lead wire 40 1.68 1.65 3.2 33 4 54 0.28
BF42HM48-1684 0.9 2 Round Lead wire 48 1.68 1.65 4.1 44 4 68 0.35
BF42HM60-1684 0.9 2 Round Lead wire 60 1.68 1.65 5 55 4 106 0.55
BF42HW20-1004-03F 1.8 2 D-cut Lead wire 20 1.0 3.4 4.3 13 4 20 0.13
BF42HS25-0404 1.8 2 Round Lead wire 25 0.4 24 36 15 4 20 0.15
BF42HS28-0504 1.8 2 Round Lead wire 28 0.5 20 21 18 4 24 0.22
BF42HS34-1334 1.8 2 Round Lead wire 34 1.33 2.1 2.5 26 4 34 0.22
BF42HS34-0404 1.8 2 Round Lead wire 34 0.4 30 35 28 4 34 0.22
BF42HS34-0956 1.8 2 Round Lead wire 34 0.95 4.2 2.5 22 6 34 0.22
BF42HS40-1206 1.8 2 Round Lead wire 40 1.2 3 2.7 32 6 54 0.28
BF42HS40-1704 1.8 2 Round Lead wire 40 1.7 1.5 2.3 42 4 54 0.28
BF42HS40-1704-13A 1.8 2 D-cut Connector 40 1.7 1.5 2.3 42 4 54 0.28
BF42HS48-1206 1.8 2 Round Lead wire 48 1.2 3.3 2.8 40 6 68 0.35
BF42HS48-1204 1.8 2 Round Lead wire 48 1.2 4.8 8.5 48 4 68 0.35
BF42HS48-0404 1.8 2 Round Lead wire 48 0.4 30 45 44 4 68 0.35
BF42HS48-1684 1.8 2 Round Lead wire 48 1.68 1.65 2.8 44 4 68 0.35
BF42HS60-1206 1.8 2 Round Lead wire 60 1.2 6 7 5.6 6 102 0.55
BF42HS60-1704A 1.8 2 D-cut Connector 60 1.7 3 6.2 7.3 4 102 0.55

NEMA 17 BF-HPR42 L Series Common Planetary Gearbox Specification

Model / BF-HPR42-L1 BF-HPR42-L2 BF-HPR42-L1SW BF-HPR42-L2SW
Gear Ratio / 4 5 10 20 25 50 100 4 5 10 20 25 50 100
Gear Trains / 1 2 1 2
Gearbox Length mm 61.5 72.5 76.5 87.5
Rated Torque N.m 9 9 5 10 10 10 5 9 9 5 10 10 10 10
Sundden Stop Torque N.m 18 18 10 20 20 20 10 18 18 10 20 20 20 20
Back Lash arcmin ≤30 arcmin ≤45arcmin ≤30 arcmin ≤45arcmin
Efficiency % 90 80 90 80
Suitable Motor Dimension mm Φ5-10 / Φ22-2 / F31-M3 Φ5-24 / Φ22-2 / F31-M3
Rated Input Speed rpm 1000
Max Input Speed rpm 2000
Average Life Span h 20000
Axial Force N 100
Radial Force N 300
Noise dB ≤55
Protection Level IP IP54
Work Temp. ℃ -20 to + 150
Out Shaft Type / Key Shaft Type
Nema 23 geared stepper motor

NEMA 23 Hybrid Stepper Motor with Common Planetary Gearbox

Stepper motor, high torque, low noise, smooth type, step angle: 0.9° or 1.2° or 1.8° NEMA23, 57x57mm
Gear Ratio: 1 Stage: 4/5/10:1
2 Stage: 20/25/50:1
Optional: Lead-wires, gearbox, encoder, brake, integrated drivers...
Model Step Angle Phase Shaft Dia Shaft Type Wirs Body Length Current Resistance Inductance Holding Torque Leads No. Rotor Inertia Weight
  (°) / mm / / (L) mm A Ω mH Nm No. g.cm2 Kg
BF57HM41-2804 0.9 2 6.35 Round Direct wire 41 2.8 0.7 2.2 0.5 4 120 0.45
BF57HM56-2804 0.9 2 6.35 Round Direct wire 56 2.8 0.9 3.3 1.2 4 300 0.7
BF57HM76-2804 0.9 2 6.35 Round Direct wire 76 2.8 1.15 5.6 1.8 4 480 1.0
BF57HS41-2804 1.8 2 6.35 Round Direct wire 41 2.8 0.7 1.4 0.55 4 150 0.47
BF57HS51-2804 1.8 2 6.35 Round Direct wire 51 2.8 0.83 2.2 1.01 4 230 0.59
BF57HS56-2804 1.8 2 6.35 Round Direct wire 56 2.8 0.9 2.5 1.26 4 280 0.68
BF57HS76-2804 1.8 2 6.35 Round Direct wire 76 2.8 1.1 3.6 1.89 4 440 1.1
BF57HS82-3004 1.8 2 8 Round Direct wire 82 3.0 1.2 4.0 2.1 4 600 1.2
BF57HS100-3004 1.8 2 8 Round Direct wire 100 3.0 0.75 3.0 3.0 4 700 1.3
BF57HS112-3004 1.8 2 8 Round Direct wire 112 3.0 1.6 7.5 3.0 4 800 1.4
BF57HS112-4204 1.8 2 8 Round Direct wire 112 4.2 0.9 3.8 3.1 4 800 1.4

NEMA 23 BF-HPR57 L Series Common Planetary Gearbox Specification

Model / BF-HPR57-L1 BF-HPR57-L2 BF-HPR57-L1SW BF-HPR57-L2SW
Gear Ratio / 4 5 10 20 25 50 4 5 10 20 25 50
Gear Trains / 1 2 1 2
Gearbox Length mm 89.5 102 100.3 112.8
Rated Torque N.m 25 25 10 25 25 20 25 25 10 25 25 20
Sundden Stop Torque N.m 50 50 20 50 50 40 50 50 20 50 50 40
Back Lash arcmin ≤30 arcmin ≤45arcmin ≤30 arcmin ≤45arcmin
Efficiency % 90 80 90 80
Suitable Motor Dimension mm Φ8-14 / Φ38.1-2 / F47.4-M4 or Φ6.35-14 / Φ38.1-2 / F47.4-M4 Φ8-22 / Φ38.1-2 / F47.14-M4 or Φ6.35-22 / Φ38.1-2 / F47.14-M4
Rated Input Speed rpm 1000
Max Input Speed rpm 2000
Average Life Span h 20000
Axial Force N 100
Radial Force N 300
Noise dB ≤55
Protection Level IP IP54
Work Temp. ℃ -20 to + 150
Out Shaft Type / Key Shaft Type
nema23 stepper motor with gearbox

NEMA 24 Hybrid Stepper Motor with Common Planetary Gearbox

Stepper motor, high torque, low noise, smooth type, step angle: 1.8° NEMA24, 60x60mm
Gear Ratio: 1 Stage: 3/4/5/6/7/10:1
2 Stage: 16/20/24/30/36/40/50:1
3 Stage: 64/96/100/144/216:1
Optional: Lead-wires, gearbox, encoder, brake, integrated drivers...
Model Step Angle Phase Shaft Type Wires Body Length Current Resistance Inductance Holding Torque Leads No. Rotor Inertia Weight
(°) / / / (L)mm A Ω mH Nm No. g.cm2 Kg
BF60HS56-2804 1.8 2 Round Direct wire 56 2.8 0.9 3.6 1.65 4 300 0.77
BF60HS67-2804 1.8 2 Round Direct wire 67 2.8 1.2 4.6 2.1 4 570 1.2
BF60HS88-2804 1.8 2 Round Direct wire 88 2.8 1.5 6.8 3.1 4 840 1.4
BF60HS100-2804 1.8 2 Round Direct wire 100 2.8 1.6 6.4 4 4 980 1100
BF60HS111-2804 1.8 2 Round Direct wire 111 2.8 2.2 8.3 4.5 4 1120 1200

NEMA 24 BF- PX57 Series Common Planetary Gearbox Specification

Model / BF-PX57-L1 BF-PX57-L2 BF-HPR57-L3
Gear Ratio / 3 4 5 6 7 10 16 20 24 30 36 40 50 64 96 100 144 216
Gear Trains / 1 2 3
Gearbox Length mm 72 86 100
Rated Torque N.m 15 30 40
Max Load N.m 25 40 50
Back Lash arcmin ≤15 ≤30 ≤50
Efficiency % 95 90 85
Weight Kg 0.9 1.2 1.4
Noise dB ≤60 ≤65 ≤75
Protection Level IP IP65
Rated Input Speed rpm ≤3000
Working hours h 20000
Install Methods / Flange
nema34 geared stepper motor

NEMA 34 Hybrid Stepper Motor with Common Planetary Gearbox

Stepper motor, low rotor inertia, large torque, fast acceleration, step angle: 1.8°, NEMA34, 86x86mm
Gear Ratio: 1 Stage: 3/4/5/6/7:1
2 Stage: 10/16/20/24/30/36:1
3 Stage: 52/64/96/100/144/216:1
Optional: Lead-wires, gearbox, encoder, brake, integrated drivers...
Model Step Angle Phase Shaft Type Wires Body Length Current Resistance Inductance Holding Torque Leads No. Rotor Inertia Weight
  (°) / / / (L)mm A Ω mH Nm No. g.cm2 Kg
BF86HS78-6004 1.8 2 Key Direct wire 78 6.0 0.37 3.4 4.6 4 1400 2.3
BF86HS115-6004 1.8 2 Key Direct wire 115 6.0 0.6 6.5 8.7 4 2700 3.8
BF86HS126-6004 1.8 2 Key Direct wire 126 6.0 0.58 6.5 9.5 4 3200 4.5
BF86HS155-6004 1.8 2 Key Direct wire 155 6.0 0.68 9.0 13.0 4 4000 5.4

NEMA 34 BF- PX86 Series Common Planetary Gearbox Specification

Model / BF-PX86-L1 BF-PX86-L2 BF-PX86-L2
Gear Ratio / 3 4 5 6 8 10 16 20 24 30 36 52 64 96 100 144 216
Gear Trains / 1 2 3
Gearbox Length mm 81 95 109
Rated Torque N.m 30 50 60
Max Load N.m 50 80 100
Back Lash arcmin ≤18 ≤30 ≤50
Efficiency % 95 90 85
Weight Kg 1.65 2.15 3.3
Noise dB ≤60 ≤65 ≤75
Protection Level IP IP65
Rated Input Speed rpm ≤3000
Working hours h 20000
Install Methods / Flange

Stepper Motor with Planetary Gearbox Key Components:

Stepper Motors:

  • A brushless DC motor that moves in discrete steps, offering precise positioning and speed control.
  • Commonly available in bipolar or unipolar configurations.
  • Steps per revolution: Typically 200 steps (1.8° per step), but microstepping can provide finer resolution.
 

Planetary Gearboxes:

  • A gear reducer with a sun gear, planet gears, and a ring gear, providing high torque output in a compact design.
  • Known for high efficiency, load distribution, and low backlash.
  • Gear ratios: Commonly range from 3:1 to 216:1.
 

How it Works?:

  • The stepper motor drives the sun gear of the planetary gearbox.
  • The planet gears rotate around the sun gear and mesh with the stationary ring gear.
  • This results in a reduction of the motor's output speed while increasing torque.
 

Advantages:

  • High Torque Output: Planetary gearboxes amplify the motor's torque significantly.
  • Compact Design: The gearbox is integrated directly with the motor, saving space.
  • Precise Motion Control: Stepper motors provide accurate positioning, especially when combined with microstepping.
  • Low Backlash: Planetary gearboxes have minimal backlash, ensuring precise motion.
  • Durability: Robust design for high-load applications.
 

Considerations:

  • Gear Ratio: Choose the appropriate gear ratio based on the required speed and torque.
  • Backlash: Ensure the gearbox has low backlash for high-precision applications.
  • Motor Size: Match the motor size (NEMA standard, e.g., NEMA 17, 23, 34) to the load requirements.
  • Operating Conditions: Consider temperature, environment (dust, moisture), and duty cycle.
  • Control Electronics: Use a stepper motor driver capable of microstepping for smoother operation.
 

Applications:

  • Robotics: Precise joint or arm motion control.
  • CNC Machines: Accurate positioning in milling, cutting, and engraving.
  • Automotive: Actuators for mirrors, seats, or wiper systems.
  • Medical Devices: Precision equipment like pumps and surgical tools.
  • Industrial Automation: Conveyors, pick-and-place systems, and packaging machines.
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