32-3157 12V 80 RPM DC Planetary Gear Motor - High Torque 32mm Gearbox with Extended 6mm D-Shaft

Specifications

• Model: 32-3157

• Operating Voltage: 12V DC

• No-Load Speed: 80 RPM

• Gearbox Type: Inline Planetary

• Shaft Type: D-Shape

• Shaft Diameter: 6mm (5.5mm at the flat cut)

• Shaft Protrusion Length: 27mm

• D-Cut Length: 15mm

• Mounting Holes: 4 holes on a 26mm diameter circle

• Gearbox Diameter: 32mm

• Motor Body Diameter: 31mm

• Total Body Length: 94.8mm (38mm Gearbox + 56.8mm Motor)

• Wiring: Pre-soldered Red and Black leads

Key Applications and Projects

• Heavy-Duty Autonomous Rovers: The 80 RPM speed provides an excellent walking pace for heavy outdoor robots, while the planetary gears survive the shock of dropping off curbs and hitting rocks.

• Linear Actuators: Driving heavy lead screws for DIY CNC Z-axes or custom lifting tables where straight-line form factor is critical.

• Motorised Camera Sliders: Providing smooth, consistent torque to pull a heavy DSLR camera rig up an incline without gear slipping.

Unlock New Capabilities (Project Evolution)

• The Pipe-Bot Inspector: Because planetary gear motors are perfectly cylindrical, they are ideal for pipe-inspection robots. Evolve your robotics skills by sliding two of these 32-3157 motors inside standard PVC or aluminum pipes. Mount tracks or continuous treads to the extended 27mm shafts, seal the ends, and you have a waterproof, tubular robot chassis capable of crawling through narrow ducting or rough terrain!

ACCESSORIES / PACKAGE INCLUDED

• 1 x 32-3157 12V 80RPM Planetary Gear DC Motor (with pre-attached wiring)

This Video describes the working of the Planetary Gear system

FREQUENTLY ASKED QUESTIONS (FAQ)

1. What is the operating voltage for this motor? This motor is optimized to run on a 12V DC power supply or a 3S LiPo battery.

2. What is the output speed? It spins at a steady 80 RPM (Revolutions Per Minute) at 12V under no load.

3. What is a planetary gearbox? Unlike standard offset gears, planetary gears use a central sun gear surrounded by smaller gears that rotate inside a ring. This distributes mechanical stress over more surface area, allowing for much higher torque and better durability.

4. What size is the output shaft? The shaft has a standard 6mm outer diameter.

5. How long is the output shaft? This motor features an extended shaft that protrudes 27mm from the front of the gearbox.

6. What does "D-Shape" mean? The 6mm shaft has a 15mm long flat section machined into it (reducing the diameter to 5.5mm at the flat). This prevents wheels or pulleys from slipping when a set screw is tightened against it.

7. Is this motor self-locking? Planetary gear motors offer high physical resistance when powered off, but they are not inherently self-locking like worm gear motors. A heavy load can still back-drive the motor.

8. Can I reverse the direction of rotation? Yes. Because it is a brushed DC motor, simply swapping the positive and negative power wires will reverse the rotation.

9. What are the dimensions of the mounting holes? The front face features four threaded mounting holes arranged evenly on a 26mm diameter pitch circle.

10. How long is the entire motor assembly? Not counting the shaft, the total body length (motor + gearbox) is 94.8mm.

11. What is the diameter of the gearbox? The silver planetary gearbox section has a diameter of 32mm.

12. What is the diameter of the black motor body? The rear motor body is slightly smaller, measuring 31mm in diameter.

13. Can I run this 12V motor on 5V? Yes, a 12V DC motor will spin on 5V, but it will run much slower and produce significantly less torque.

14. Is this motor waterproof? No. While the tubular design is clean, the metal housing, seams, and wire entry points are exposed.

15. Can I control the speed of this motor? Yes, you can use a 12V-compatible PWM (Pulse Width Modulation) DC motor speed controller or an H-Bridge to throttle the speed.

16. How do I connect power to this motor? It comes with a red and black wire pigtail pre-soldered to the rear terminals, ready to be connected to your motor driver.

17. What is the small nub on the back of the motor? That is a rear bearing/shaft boss. It measures 12mm in diameter and protrudes 1.6mm from the back plate. Ensure your mounting brackets have clearance for it.

18. Can I open the gearbox to change the ratio? It is highly discouraged. Planetary gearboxes contain dozens of precise, greased components. Opening it will likely void warranties and is incredibly difficult to reassemble correctly.

19. Will this work for a DIY smart blinds project? 80 RPM is an excellent speed for drawing blinds, and the planetary gears provide ample torque for heavy fabrics.

20. What type of coupling do I need to attach a wheel? You should use a 6mm rigid flange coupling, a 6mm hex hub, or a flexible shaft coupler that features a set screw to clamp down securely on the flat D-shaft profile.