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Micro Planetary Gearmotors

Miniature planetary gear motors for high torque density, coaxial packaging, and compact robotic or instrument drives.

Target Buyer:Ideal for engineers who need coaxial output, compact OD, and higher torque than a bare motor can provide.
Send RFQContact Engineering
Micro planetary gearmotor with coaxial output shaft

Capability Highlights

  • High torque density in a small diameter
  • Metal, plastic, or hybrid gear options
  • Encoder and BLDC configurations available

Typical Applications

  • Robot grippers
  • Medical pumps
  • Precision instruments

Engineering Focus

  • Planetary stage count and ratio selection
  • Backlash and noise tradeoff
  • Bearing support for radial or axial load

Specification Window

Use these inputs to narrow the product family before sample selection, drawing review, and quotation.

ParameterSelection GuidanceBuyer Input Needed
Coaxial envelopePlanetary stages keep output coaxial for tight OD-controlled assemblies.Maximum OD, total length, mounting reference, and output load location.
Reduction ratio3:1-1000:1 ratio paths can be reviewed by stage count, efficiency, and torque need.Loaded RPM, target torque, acceptable current, and ratio preference.
Backlash and reversing loadBacklash targets need to be defined before choosing gear material and stage count.Direction changes, positioning tolerance, and holding torque requirement.
Feedback and motor typeEncoder, Hall, brushed DC, or BLDC variants can be reviewed for closed-loop drives.Control mode, signal type, connector pinout, and controller constraints.

Engineering Data Matrix

Family-level ranges for pre-RFQ screening. Final winding, ratio, shaft, connector, and validation values are locked after drawing review.

Model ClassEnvelopeVoltageRatioSpeedTorqueFeedbackDrawing Status
6mm metal planetary classUltra-small coaxial package3-6V reviewHigh-ratio custom review, including 1:1708-class requestsLow-speed precision output by ratioLow-mass medical or instrument loads3 PPR / 12 PPR Hall review by scopeMiniature envelope CAD by RFQ
8-16mm metal planetary classCompact coaxial package3-12V reviewMulti-stage ratio review up to 1:1972-class requests5-800 RPM selection windowHigh torque density in small ODHall / magnetic encoder optionalSTEP/IGES envelope by project review
22-42mm planetary gearmotorHigher-load miniature assembly6-24V review3:1-1000:1 typical review5-600 RPM selection windowRobotics, automation, and pump drive loadsEncoder / BLDC pairing optional2D/3D drawing pack by RFQ

CAD, Drawing, and Curve Pack

Drawing packs are prepared against the project envelope, so the site does not publish universal CAD downloads that could mislead drop-in selection.

2D outline PDF/DWG3D STEP/IGES envelopeShaft/flange drawing review

Inputs needed before release

  • Target envelope or existing motor drawing
  • Output shaft, flange, mounting, and connector constraints
  • Voltage, loaded speed, torque, duty cycle, quantity, and destination

CAD and drawing packs are released after the project envelope and confidentiality requirements are confirmed.

Request CAD PackRequest via WhatsAppOpen Technical Library

Performance Review Points

These checks turn a catalog choice into a quoteable sample path with measurable acceptance criteria.

Loaded torque-speed-current point

Buyer input

Target torque, output RPM, voltage, duty cycle, and current limit.

Engineering output

Recommended ratio, winding path, and sample validation point for quotation.

Thermal and duty-cycle margin

Buyer input

Run time, rest time, stall exposure, ambient temperature, and enclosure notes.

Engineering output

Risk note for heat rise, gear wear, lubricant choice, and test scope.

Mechanical interface lock

Buyer input

Shaft drawing, flange hole pattern, cable route, connector, and assembly order.

Engineering output

Drawing review notes before sample build, fixture planning, or batch inspection.

Backlash and shock-load review

Buyer input

Reversing load, positioning tolerance, impact events, radial/axial load, and temperature range.

Engineering output

Planet stage count, gear material, bearing support, and validation plan.

Product Evidence Pack

Request the right engineering files for Micro Planetary Gearmotors

These buyer-side templates connect the product family page to the technical library, quality review, and RFQ intake. They help engineering and procurement teams ask for the same files at the same approval stage.

Request This Pack

Product fit

Datasheet and RFQ Baseline

Start Micro Planetary Gearmotors screening with the same voltage, torque, speed, ratio, envelope, shaft, quantity, and schedule fields used by the RFQ team.

  • Torque-speed requirement
  • Maximum OD and length
  • Duty cycle and life target
Download Datasheet Template

Mechanical review

CAD and Drawing Release Scope

CAD and drawing packs are released after the project envelope and confidentiality requirements are confirmed.

  • 2D outline PDF/DWG
  • 3D STEP/IGES envelope
  • Shaft/flange drawing review
Open CAD Request Scope

Sample test

Torque-Speed-Current Validation

Use a shared report format before sample approval so loaded speed, torque, current, case temperature, noise, and pass/fail notes stay comparable.

  • Loaded torque-speed-current point
  • Thermal and duty-cycle margin
Download Test Report Template

Quality gate

Incoming and Release Inspection

Tie the approved sample to inspection checkpoints before pilot builds or repeat orders scale into batch production.

  • Loaded torque, speed, current, and efficiency checks for the selected ratio.
  • Backlash, reversing load, and radial/axial load review where precision matters.
  • Noise, life, and thermal checks under the buyer duty cycle.
Download Inspection Checklist

Key Evaluation Matrix

MetricTypical RangeWhy It Matters
Reduction ratio3:1-1000:1Defines output speed, torque multiplication, and efficiency loss.
Backlash targetApplication-specificImportant for reversing loads and closed-loop positioning.

Commercial Scope

RFQ Pricing, Shipping, and Return Baseline

Product-family pages support engineering and sourcing decisions before a custom quotation. They do not operate as cart checkout pages with universal prices, shipping rates, or consumer return handling.

RFQ price basis
Quoted in USD after voltage, ratio, shaft, connector, validation scope, sample quantity, annual volume, destination, and trade terms are reviewed.
Quotation baseline
Commercial review baseline active from 2026-08-06; final price, lead time, and quote validity are controlled by the confirmed quotation or purchase order record.
Export shipping review
Freight cost, Incoterm, destination, packaging, and transit-time assumptions are confirmed during RFQ. This site does not publish a universal cart shipping rate for custom motors.
Custom return scope
Custom samples and production lots are not handled as consumer returns. Replacement, rework, credit, or nonconformance handling follows the confirmed quotation, purchase order, drawing revision, and inspection agreement.
Review Commercial Terms

OEM Customization Options

  • Planetary stage count, ratio, gear material, and lubrication selection.
  • Low-backlash review for reversing loads and compact positioning modules.
  • Custom output shaft, mounting flange, bearing support, harness, and connector.
  • Encoder, Hall, or BLDC motor pairing for closed-loop speed or position control.

Validation Evidence to Request

  • Loaded torque, speed, current, and efficiency checks for the selected ratio.
  • Backlash, reversing load, and radial/axial load review where precision matters.
  • Noise, life, and thermal checks under the buyer duty cycle.
  • Sample report alignment before freezing drawings and batch inspection points.

RFQ Checklist

  1. Torque-speed requirement
  2. Maximum OD and length
  3. Duty cycle and life target
  4. Encoder, Hall, or controller requirement

Risk Controls

  • Incorrect ratio selected from no-load speed only: Use loaded output speed and torque, not catalog no-load speed, for selection.

Product Gallery

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Buyer FAQ

Do you offer low-backlash versions?

Low-backlash designs can be reviewed when the buyer provides load, direction changes, and target precision.

Recommended Decision Path

Continue from this product family into adjacent product architectures, application notes, and OEM capability pages.

Request Engineering Review

Share the required envelope, voltage, torque, speed or ratio, shaft interface, harness, feedback, quantity, destination, and validation target. The form keeps email and WhatsApp fallbacks synchronized with the product data you enter.

Product RFQ Intake

Send Selection Data for Engineering Review

Use this form when you need model selection, CAD/drawing review, sample routing, or quotation support for this motor family.

Layer 1 - Product and Application

Layer 2 - Electrical and Mechanical Load

Layer 3 - Stage and Evidence

Email DraftWhatsApp

Attach drawings, CAD files, or test data in the follow-up email thread if they cannot be submitted through this form.