A planetary gear motor from SLW Motor pairs a brushed, brushless, or coreless DC motor with a planetary gear stage for higher torque density and lower backlash than a single spur pair gives in the same housing diameter. The line runs 12mm to 42mm, with encoder integration built into assembly rather than bolted on afterward — the same production run that mounts the motor and gearbox also installs and wires the feedback device.
Two-wire control and the lowest unit cost of the four drive configurations.
Browse the full Brushed DC Motors lineup for voltage and frame combinations that accept a planetary stage. BLDC Motors with Encoder 22mm Brushed Coreless 16mm Brushless Coreless 22mm Brushless Coreless 28mm Brushed 28mm Brushless 36mm Brushless 42mm Brushed 42mm Brushless
Brush-free construction holds up better under continuous load.
See the full Brushless DC Motors range, plus the High Speed Brushless DC Motors line.
Lower rotor inertia gives faster start/stop response in miniature mechanisms.
The coreless DC motors range spans 10mm–22mm frames commonly paired with a planetary gearbox.
Adds incremental feedback for closed-loop speed or position control.
The 12mm brushless coreless planetary gear motor with encoder combines motor and gearbox in one assembly.
Standard planetary gear motor configurations already in production include 12mm Brushed Coreless and 16mm Brushed Coreless units.
Also in production are the 15mm Motor + 20mm Gearbox and 24mm Brushed units.
Not every planetary gearbox motor needs the same electrical platform behind it.
SLW builds planetary stages onto four drive configurations, so gear ratio and torque curve can be matched to your control circuit.
Planetary geared motors scale by diameter, and torque, speed, and voltage shift with the frame. Reference figures from the catalog datasheets: 12mm planetary gearbox reducer 13mm spur gearbox
| Diameter | Rated Voltage (applied range) | Ratios | Output Speed | Rated Torque | Products |
|---|---|---|---|---|---|
| 12mm | 12V (3–12V) | 4 tiers (BLC1221-01…04) | 10–1,280 rpm rated | 3.7–3,000 g·cm; stall to 7,500 g·cm | 12mm brushed coreless + planetary, 12mm brushless coreless + planetary + encoder (118 rpm, 0.8 kg·cm rated) |
| 15/20mm | 6–24V | Multi-stage, 4:1 and up | Set by ratio | 3,000–4,000 g·cm reducer rating | 15mm brushed motor + 20mm planetary gearbox, 20mm planetary gearbox reducer |
| 16mm | 6–48V (brushed), 12–24V (brushless) | 14:1–1621:1, 11 ratios | 5.5–855 rpm rated | 0.28–51.87 kg·cm | 16mm brushed coreless + planetary, 16mm brushless coreless + planetary |
| 22mm | 6–24V (brushed), 6–48V (brushless) | 5:1–1080:1 reducer range | 9 rpm (brushed coreless build) | 60 kg·cm stall (brushed coreless build) | 22mm brushed coreless + planetary, 22mm brushless coreless + planetary |
| 24mm | 370 brushed platform | Multiple ratios | Set by ratio | High torque, robust load distribution | 24mm brushed + planetary |
| 28mm | 12V (6–48V) | 4:1–625:1, 1–4 stages | 73–1,600 rpm rated (BLDC build) | 0.5–8 kg·cm rated, 11.2W (BLDC build) | 28mm brushed (395) + planetary, 28mm BLDC + planetary |
| 36mm | 24V (6–48V) | 3.7:1–721:1, 1–4 stages | Set by ratio | 11.6W rated power (3625 BLDC build) | 36mm 3530 brushed + planetary, 36mm 555 brushed + planetary, 36mm 3625 BLDC, 36mm 3650 BLDC |
| 42mm | 24V (6–48V) | 3.7:1–721:1, 1–4 stages | 235–1,720 rpm rated (BLDC build, low ratios) | 2–13.5 kg·cm rated, 44.2W (BLDC build) | 42mm 775 brushed + planetary, 42mm BLDC + planetary |
Standalone reducers from 10mm to 45mm sit under mini gearboxes, and the low-rpm, high-torque end under high torque DC motors. 10mm
Every planetary gearbox with motor we ship starts from a base frame and gets tuned to the application, from performance parameters to gear ratio and stage count.
Torque, speed, voltage, and power point are set to match the application's duty.
Single- or multi-stage planetary trains are sized to your torque and envelope target.
Housings and gears use brass, stainless steel, powder-metallurgy alloys, or engineering plastics.
Encoder integration supports closed-loop control, and PCB soldering and wire harness assembly are available.
Quieter gear meshes and extended-cycle tuning suit continuous-run equipment.
If a planetary stage isn't right, the same process applies across our gearbox, Stepper Gear Motors, and Worm Gear Motors.
All of these lines are built on the same brass, stainless, and engineering-plastic material options, so the customization process carries over.
SLW Motor runs a dedicated 2,400 m² factory in Shenzhen with 56+ staff and 15+ years of gear motor R&D, including projects for Japanese manufacturing customers. Every planetary gear motor passes incoming inspection, in-process testing, and final verification before it ships.
Whether you need a single prototype sample or a stable bulk order, our engineering team reviews torque, speed, voltage, and housing requirements before quoting. Contact us with your target specs for prompt quotation feedback, or send drawings for a fully custom OEM/ODM planetary gear motor design.
Share your target specifications and drawings so we can quote a planetary gear motor built to your application.
Planetary gear motors provide compact torque for robotic joints, motion stages, and automated equipment. Explore our Explore Robotics Applications, or learn how the sun, planet, and ring gears work in this planetary gear motor guide.
Need to compare gearbox types? See how planetary, spur, and worm gearboxes differ in compact drive applications. Planetary gear motors can also deliver high torque in power tools and portable equipment.
Explore Robotics ApplicationsPlanetary gear motors can support compact drive requirements in medical devices, where installation space and controlled motion are important.
Their gearbox configuration can help deliver torque within a small footprint. Motor selection should match the device’s speed, load, noise, and operating requirements.
Explore Medical Device ApplicationsIn industrial machinery, planetary gear motors are used in compact drive systems that require torque multiplication and reliable motion transmission.
They can suit production equipment and automation mechanisms when the required output speed, torque, duty cycle, and mounting space are properly matched.
Explore Industrial ApplicationsPlanetary gear motors may be considered for prototype actuation and test equipment in aerospace and defense projects.
For these applications, motor and gearbox selection depends on the project’s load, size, operating conditions, and qualification requirements.
Explore Aerospace ApplicationsPlanetary gear motors can provide high torque in a compact drive for power tools and portable equipment.
Their small gearbox layout can help fit the drive into space-limited designs. Choose a motor based on the tool’s required speed, torque, duty cycle, and size.
Explore Portable Equipment Applications
A planetary gear motor is a brushed, brushless, or coreless DC motor driving a planetary gear stage instead of a single spur pair.
Tell us your project or application requirements, and our team will get back to you with technical support, product recommendations, or a customized motor solution.
