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Home / Products Centre / Stepper Motor / Geared Stepper Motor / Common Planetary Geared Stepper 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 geared stepper motor (4)

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 Shaft Dia Shaft Length Current Resistance Inductance Holding Torque Leads No. Rotor Inertia Weight
(°) / / / (L)mm mm mm A Ω mH N.cm No. g.cm2 Kg
BF28HS32-0674 1.8 2 Round Directwires 32 5 10 0.67 5.6 3.4 6 4 9 0.11
BF28HS45-0674 1.8 2 Round Directwires 45 5 10 0.67 6.8 4.9 9.5 4 12 0.14
BF28HS51-0674 1.8 2 Round Directwires 51 5 10 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 Shaft Dia Shaft Length Current Resistance Inductance Holding Torque Leads No. Rotor Inertia Weight
(°) / / / (L)mm mm mm A Ω mH N.cm No. g.cm2 Kg
BF35HS28-0504 1.8 2 Round Direct wire 28 5 10 0.5 20 14 10 4 11 0.13
BF35HS34-1004 1.8 2 Round Direct wire 34 5 10 1 2.7 4.3 14 4 13 0.17
BF35HS42-1004 1.8 2 Round Direct wire 42 5 10 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 BF-HPR42 L / LSW Series 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 Shaft Dia Shaft Length Current Resistance Inductance Holding Torque Leads No. Rotor Inertia Weight
(°) / / / (L)mm mm  mm A Ω mH N.cm No. g.cm2 Kg
BF42HS25-0404-FLE42-L 1.8 2 Round Lead wire 25 5 10 0.4 24 36 15 4 20 0.15
BF42HS25-0404-FLE42-LSW 1.8 2 Round Lead wire 25 5 24 0.4 24 36 15 4 20 0.15
BF42HS28-0504-FLE42-L 1.8 2 Round Lead wire 28 5 10 0.5 20 21 18 4 24 0.22
BF42HS28-0504-FLE42-LSW 1.8 2 Round Lead wire 28 5 24 0.5 20 21 18 4 24 0.22
BF42HS34-1334-FLE42-L 1.8 2 Round Lead wire 34 5 10 1.33 2.1 2.5 26 4 34 0.22
BF42HS34-1334-FLE42-LSW 1.8 2 Round Lead wire 34 5 24 1.33 2.1 2.5 26 4 34 0.22
BF42HS34-0956-FLE42-L 1.8 2 Round Lead wire 34 5 10 0.95 4.2 2.5 22 6 34 0.22
BF42HS34-0956-FLE42-LSW 1.8 2 Round Lead wire 34 5 24 0.95 4.2 2.5 22 6 34 0.22
BF42HS40-1206-FLE42-L 1.8 2 Round Lead wire 40 5 10 1.2 3 2.7 32 6 54 0.28
BF42HS40-1206-FLE42-LSW 1.8 2 Round Lead wire 40 5 24 1.2 3 2.7 32 6 54 0.28
BF42HS40-1704-FLE42-L 1.8 2 Round Lead wire 40 5 10 1.7 1.5 2.3 42 4 54 0.28
BF42HS40-1704-FLE42-LSW 1.8 2 Round Lead wire 40 5 24 1.7 1.5 2.3 42 4 54 0.28
BF42HS48-1206-FLE42-L 1.8 2 Round Lead wire 48 5 10 1.2 3.3 2.8 40 6 68 0.35
BF42HS48-1206-FLE42-LSW 1.8 2 Round Lead wire 48 5 24 1.2 3.3 2.8 40 6 68 0.35
BF42HS48-1684-FLE42-L 1.8 2 Round Lead wire 48 5 10 1.68 1.65 2.8 44 4 68 0.35
BF42HS48-1684-FLE42-LSW 1.8 2 Round Lead wire 48 5 24 1.68 1.65 2.8 44 4 68 0.35
BF42HS60-1206-FLE42-L 1.8 2 Round Lead wire 60 5 10 1.2 6 7 56 6 102 0.55
BF42HS60-1206-FLE42-LSW 1.8 2 Round Lead wire 60 5 24 1.2 6 7 56 6 102 0.55
BF42HS60-1704A-FLE42-L 1.8 2 D-cut Connector 60 5 10 1.7 3 6.2 73 4 102 0.55
BF42HS60-1704A-FLE42-LSW 1.8 2 D-cut Connector 60 5 24 1.7 3 6.2 73 4 102 0.55

NEMA 17 BF-HPR42 L / LSW Series Common Planetary Gearbox Specification

Model / BF-FLE42-L1 BF-FLE42-L2 BF-FLE42-L1SW BF-FLE42-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 BF-FLF57 Series 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 Type Body Length Shaft Dia Shaft Length Current Resistance Inductance Holding Torque Leads No. Rotor Inertia Weight
(°) / / (L) mm mm mm A Ω mH Nm No. g.cm2 Kg
BF57HS41-2804 with HPR57-L Series 1.8 2 Round 41 6.35 / 8 14.5 2.8 0.7 1.4 0.55 4 150 0.47
BF57HS41-2804 with HPR57-LSW Series 1.8 2 Round 41 6.35 / 8 21 2.8 0.7 1.4 0.55 4 150 0.47
BF57HS51-2804 with HPR57-L Series 1.8 2 Round 51 6.35 / 8 14.5 2.8 0.83 2.2 1.01 4 230 0.59
BF57HS51-2804with HPR57-LSW Series 1.8 2 Round 51 6.35 / 8 21 2.8 0.83 2.2 1.01 4 230 0.59
BF57HS56-2804 with HPR57-L Series 1.8 2 Round 56 6.35 / 8 14.5 2.8 0.9 2.5 1.26 4 280 0.68
BF57HS56-2804with HPR57-LSW Series 1.8 2 Round 56 6.35 / 8 21 2.8 0.9 2.5 1.26 4 280 0.68
BF57HS76-2804 with HPR57-L Series 1.8 2 Round 76 6.35 / 8 14.5 2.8 1.1 3.6 1.89 4 440 1.1
BF57HS76-2804with HPR57-LSW Series 1.8 2 Round 76 6.35 / 8 21 2.8 1.1 3.6 1.89 4 440 1.1
BF57HS82-3004 with HPR57-L Series 1.8 2 Round 82 6.35 / 8 14.5 3.0 1.2 4.0 2.1 4 600 1.2
BF57HS82-3004with HPR57-LSW Series 1.8 2 Round 82 6.35 / 8 21 3.0 1.2 4.0 2.1 4 600 1.2
BF57HS100-3004 with HPR57-L Series 1.8 2 Round 100 6.35 / 8 14.5 3.0 0.75 3.0 3.0 4 700 1.3
BF57HS100-3004 with HPR57-LSW Series 1.8 2 Round 100 6.35 / 8 21 3.0 0.75 3.0 3.0 4 700 1.3
BF57HS112-3004 with HPR57-L Series 1.8 2 Round 112 6.35 / 8 14.5 3.0 1.6 7.5 3.0 4 800 1.4
BF57HS112-3004 with HPR57-LSW Series 1.8 2 Round 112 6.35 / 8 21 3.0 1.6 7.5 3.0 4 800 1.4
BF57HS112-4204 with HPR57-L Series 1.8 2 Round 112 6.35 / 8 14.5 4.2 0.9 3.8 3.1 4 800 1.4
BF57HS112-4204 with HPR57-LSW Series 1.8 2 Round 112 6.35 / 8 21 4.2 0.9 3.8 3.1 4 800 1.4

NEMA 23 BF-FLF57 L Series Common Planetary Gearbox Specification

Model / BF-FLF57-L1 BF-FLF57-L2 BF-FLF57-L1SW BF-FLF57-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 PX57 Series 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 PX86 Series 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.

FAQs of Customized Planetary Geared Stepper Motor

1. What is a Planetary geared stepper motor and how does it differ from a standard geared stepper motor?

A Planetary geared stepper motor uses a planetary gearbox integrated with a stepper motor to amplify torque and reduce speed while maintaining compact size and low backlash.

 

2. What advantages does a planetary gearbox offer in a geared stepper motor design?

Planetary gearboxes provide high torque output, load distribution across multiple gears, low backlash and high efficiency which improve precision motion control.

 

3. Why would a customer choose a stepper motor with planetary gearbox for their application?

A stepper motor with planetary gearbox is ideal for heavy load or slow precise positioning systems such as robotics, CNC axes, pick and place systems and automotive actuators.

 

4. How does the gearing ratio impact the performance of a planetary geared stepper motor?

Higher gear ratios reduce output speed while increasing torque and resolution, important for precision positioning under load.

 

5. What NEMA frame sizes are available for Planetary geared stepper motors from Besfoc?

Planetary geared stepper motors are offered in multiple frame sizes including NEMA 11, NEMA 14, NEMA 17, NEMA 23, NEMA 24 and NEMA 34.

 

6. How does low backlash in a planetary geared stepper motor benefit motion control?

Low backlash improves bidirectional repeatability and positioning accuracy because gear slop is minimized.

 

7. What is the typical efficiency of a planetary geared stepper motor?

Planetary gearbox stepper motors often have high efficiency up to around 96% depending on gearbox selection.

 

8. Are different gear trains and stages available in Besfoc planetary geared stepper motor products?

Yes customers can choose one-stage, two-stage or three-stage gear trains to match speed and torque requirements.

 

9. How does Besfoc support OEM ODM Customized planetary geared stepper motor configurations?

Besfoc provides OEM ODM Customized options including tailored gear ratios, shaft sizes, encoder integration and mounting features.

 

10. Can planetary geared stepper motors include optional encoders and brakes?

Yes planetary geared stepper motors can be customized with encoders for feedback and brakes for holding position when powered off.

 

11. How does integrating a planetary gearbox improve torque for a geared stepper motor?

The planetary gearbox multiplies the motor torque at the output shaft making the motor suitable for high load applications.

 

12. What applications are suited for stepper motors with planetary gearbox solutions?

They are widely used in robotics, CNC machines, automatic packaging, medical devices and precision automation.

 

13. Can customers choose custom gear ratios under Besfoc OEM ODM Customized services?

Yes custom gear ratios can be specified by customers to match system speed and torque requirements.

 

14. How does the planetary gearbox design impact noise performance in a geared stepper motor?

The evenly distributed planetary gears help reduce noise under load compared to some other gearbox designs.

 

15. Are planetary geared stepper motors suitable for continuous duty applications?

Yes with robust gearbox materials and design, these motors are suitable for continuous use in industrial environments.

 

16. How does the planetary geared stepper motor design support compact machinery layouts?

Thanks to the compact planetary gearbox integration, the assembled motor remains small while providing increased torque.

 

17. Can the output shaft type be customized for a planetary geared stepper motor?

Yes under OEM ODM Customized services, output shaft type, length and diameter can be designed for specific mounting needs.

 

18. What environmental protection levels are available for geared stepper motor assemblies?

Depending on customization choices, planetary geared stepper motors can be designed with protection like IP54 or higher for dusty or wetter environments.

 

19. How does the gearbox size choice affect axle forces and motor performance?

Larger gearboxes can withstand higher axial and radial forces and offer greater torque handling while maintaining stability.

 

20. How does OEM ODM Customized support help designers integrate planetary geared stepper motors into their system?

Customized services allow designers to match precise performance parameters, mechanical interfaces and electrical specifications to achieve better integration and performance.

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