High-ratio 16mm and 22mm micro planetary gear motors for compact electric valves, smart shutoff modules, metering valves, and flow-control actuators that need repeatable torque after long idle periods.
Solution recommendations are confirmed by RFQ after the real load, envelope, quantity, and validation scope are reviewed.
Application Buyer Review Path
Application buyers usually need more than a product suggestion. Use this review path to connect mechanical fit, controls, quote scope, and validation evidence before a sample is approved.
| Buyer Role | Decision Check | Page Evidence | Next Step |
|---|---|---|---|
| Mechanical / System Engineering | Load path, available OD and length, shaft datum, flange geometry, cable exit, radial load, and mating CAD revision. | Application intake, implementation focus, selection logic, CAD/STEP panel, and related product routes. | Request CAD / STEP |
| Electrical / Controls | Voltage window, current limit, driver type, feedback signal, EMI concern, braking behavior, and duty cycle. | Evaluation matrix, feedback route, validation package, and sample test evidence request. | Review encoder options |
| Procurement / Program | Prototype quantity, annual volume, sample timing, quote scope, destination, and approved supplier workflow. | RFQ checklist, WhatsApp handoff, email template, export file scope, and related OEM support links. | Send RFQ |
| Quality / NPI | Drawing revision, CTQ dimensions, torque-speed test condition, noise/backlash method, EOL limits, and lot traceability. | Production and QC flow, risk controls, validation package, and buyer-defined evidence scope. | Quality evidence |
Application RFQ Intake
The first review should capture load, speed, space, validation, and compliance constraints, not just a motor part number. This keeps the recommended gear ratio, shaft, feedback, and test plan tied to the real machine.
| RFQ Input | Examples to Provide | Engineering Output |
|---|---|---|
| Load and motion profile | Continuous torque, peak torque, stall/jam event, stroke, angle, wheel load, or pump cycle. | Frames the motor diameter, winding, ratio, gear material, and torque reserve before sample selection. |
| Speed, timing, and ratio boundary | No-load RPM, loaded output RPM, actuation time, known ratio, or acceptable speed tolerance. | Creates the candidate ratio table with rated-load speed, current, efficiency, and thermal expectation. |
| Noise, backlash, and repeatability | dB limit, measurement distance, arcmin or degree backlash target, reversing frequency, positioning need. | Separates POM, hybrid, metal, low-backlash, encoder, and Hall-feedback paths early. |
| Envelope and interface control | Target OD, max length, shaft drawing, flange datum, cable exit, connector, mating CAD revision. | Prevents CAD/STEP mismatch and keeps shaft, mounting, harness, and packaging changes visible. |
| Validation and production scope | Prototype quantity, annual volume, life target, destination, RoHS/REACH, ISO file, packing rules. | Defines sample evidence, EOL test limits, compliance files, lead time, and production quote assumptions. |
| Evaluation Metric | Typical Range | Buyer Relevance |
|---|---|---|
| Breakaway Torque Margin | Aged-valve torque plus buyer-defined reserve | Valve friction rises after contamination, pressure load, scale buildup, or long idle periods, so catalog no-load torque is not enough. |
| Frame and Torque Class | 16/22mm planetary candidates commonly reviewed for mid-load electric valves | Mid-size frames can provide useful torque density while keeping smart valve housings compact. |
| Open/Close Time | Travel angle, gear ratio, load, and voltage dependent | A ratio that solves torque can make the valve too slow, so loaded speed must be tested with the real valve profile. |
| Stall Current and End-Stop Control | Controller-defined current limit and stop method | Hard end stops can damage gears if the control board keeps driving after the valve is closed. |
| Holding and Back-Drive Behavior | Gear ratio, valve load, and motor type dependent | Shutoff valves may need to hold position without power, while metering valves may need controlled partial opening. |
| Cycle Life and Environment | Buyer-defined life target under temperature, moisture, and valve load | Life testing should reflect real valve friction, end stops, idle periods, humidity, and temperature exposure. |
Sample Qualification Plan
These checks help engineering, procurement, and quality teams turn the application discussion into sample acceptance criteria before CAD freeze or pilot procurement.
| Workstream | Buyer Question | Evidence to Prepare | Pass Signal |
|---|---|---|---|
| Breakaway torque reserve | Will the actuator open after long idle periods, pressure load, scale buildup, or aged valve friction? | Valve torque curve, aged-valve margin, pressure condition, idle period, minimum voltage, and open/close time. | Starts movement reliably at minimum voltage and finishes travel within target time under worst-case torque. |
| End-stop and stall protection | Will the controller and gearbox survive repeated hard-close or blocked-valve events? | Stall current limit, cutoff timing, feedback method, mechanical compliance, end-stop count, and duty interval. | Current is cut or limited before gear damage, and post-test speed, noise, and backlash remain stable. |
| Position and hold confirmation | Can the valve confirm full open, full close, or partial metering position instead of relying on timing alone? | Hall, encoder, limit switch, or current-sensing plan, cable pinout, travel angle, and position tolerance. | Feedback or current signature confirms position states without false pass signals under loaded motion. |
| Moisture and seal interface | Will the cable exit, shaft interface, grease, and enclosure survive the target humidity or water exposure? | IP target, mounting orientation, cable seal, shaft seal, grease requirement, temperature range, and exposure method. | No water path, corrosion concern, or grease issue appears after the agreed exposure and functional retest. |
Product Family Routing
A solution page should make the next product review obvious. Match the dominant application signal to a product family, then send the listed inputs so engineering can confirm the route.
| Application Signal | Recommended Product Route | Inputs to Confirm | Review |
|---|---|---|---|
| High torque, shock load, wheel load, breakaway torque, or jam condition | High-torque miniature gear motors or metal gear micro planetary drives with reinforced gear stack review. | Share continuous torque, peak torque, stall time, shaft load, duty cycle, and current limit. | High torque motors |
| Quiet patient-adjacent, indoor, optical, or residential motion target | Low-noise, coreless, POM, or hybrid gear stage route before moving to metal gears. | Share dB limit, measurement distance, enclosure condition, load, temperature, and life target. | Low noise motors |
| Positioning, odometry, repeatability, stall detection, or closed-loop control | Encoder or Hall-feedback planetary gear motor with defined signal and EOL checks. | Share CPR, signal voltage, controller input, cable route, pinout, and target resolution. | Encoder motors |
| Custom shaft, flange, connector, harness, bracket, or module packaging | Custom OEM micro drive assembly with drawing revision, tooling boundary, and production handoff. | Attach mating drawing, shaft profile, flange datum, connector model, packing rule, and annual volume. | OEM assemblies |
| Material, backlash, noise, and durability tradeoff is not frozen | POM, hybrid, MIM metal, or low-backlash route reviewed against the real application load. | Share noise target, reversing frequency, backlash limit, shock condition, grease concern, and cost band. | Material guide |
| Decision Point | Recommended Path | Validation Input |
|---|---|---|
| 10/12mm versus 16/22mm frame size | Use 10mm or 12mm builds for light compact valves; review 16mm and 22mm metal gear motors when breakaway torque, stall load, or cycle life increases. | Housing diameter and length, valve torque curve, target open time, voltage, and life target. |
| Breakaway torque versus open/close time | Choose the ratio from aged valve torque and required open/close time, then confirm loaded speed rather than no-load speed. | Breakaway torque, running torque, target angle, open/close time, and voltage range. |
| End-stop protection | Use controller current limits, feedback, timed cut-off, or mechanical compliance when the valve closes against hard stops. | End-stop frequency, stall current limit, feedback requirement, allowed overshoot, and expected cycle life. |
| Position feedback versus open-loop timing | Open-loop timing may fit simple full-open/full-close valves; use Hall, encoder, limit switch, or current sensing for metering, diagnostics, and stall detection. | Required position states, partial-open tolerance, controller input type, cable length, and safety logic. |
| Environment and grease selection | Match metal or hybrid gear stages with grease, seal design, and temperature exposure before production freeze. | Temperature range, moisture exposure, valve media environment, and enclosure sealing target. |
| Stage | Control Point | Buyer Evidence |
|---|---|---|
| Valve torque profile review | Convert breakaway torque, running torque, pressure load, travel angle, and aged friction assumptions into motor, gear material, and ratio candidates. | Torque table, angle/time requirement, current limit, hold requirement, and interface drawing. |
| DFM and interface freeze | Review output shaft, D-cut, flange, bracket, cable exit, connector, seal interface, and assembly clearance against the valve body. | 2D/3D drawing revision, cable route, connector pinout, seal target, and sample BOM option. |
| Loaded environmental sample test | Validate open/close time, current draw, thermal rise, noise, stall behavior, feedback response, and water or humidity exposure on a representative valve load. | Sample test report with load condition, voltage, temperature, moisture exposure, feedback signal, and cycle notes. |
| Pilot run and EOL limits | Freeze EOL speed/current/noise/feedback checks, grease lot, shaft inspection, packaging, and traceability before volume release. | Pilot lot record, EOL criteria, material and grease notes, packaging record, and outgoing inspection plan. |
| Shipment and replacement control | Maintain drawing revision, lot traceability, packing protection, and replacement compatibility for actuator assemblies. | Approved drawing revision, lot label plan, packing photo, and outgoing inspection record. |
Design Freeze Risk Check
Most application failures are not caused by the gear ratio alone. Close these checks before the motor family, drawing revision, and validation method are locked.
| Failure Mode | Early Signal | Prevention |
|---|---|---|
| Torque reserve disappears after the real fixture is installed | No-load speed looks acceptable, but current rises or motion stalls under seal friction, wheel load, spring force, or end-stop impact. | Quote against continuous, peak, and stall conditions with voltage sag, current limit, duty cycle, and thermal path included. |
| CAD fit passes once, then fails after shaft or connector revision | The gearbox OD fits the enclosure, but the shaft flat, flange datum, cable exit, connector, or bend radius changes late. | Freeze drawing revision, mating CAD, cable route, shaft datum, and connector clearance before pilot release. |
| Noise or backlash is rejected because the method was unclear | Buyer and supplier use different load, distance, preload, fixture, background noise, or backlash measurement conditions. | Define dB distance, load fixture, backlash preload, direction changes, and pass/fail limit before sample testing. |
| Thermal, EMI, or feedback issues appear only in pilot build | Bench samples pass, but enclosure heat path, controller current limit, cable routing, or encoder signal quality changes in the real device. | Validate the motor with buyer-like enclosure, driver, cable route, duty profile, and EOL signal checks. |
| Approved samples drift when the program moves to production | Prototype BOM, gear material, grease, label, packing, or EOL limit is not tied to an approved revision. | Keep approved sample record, BOM option, drawing revision, EOL criteria, lot labels, and outgoing inspection plan together. |
Validation Package
Application pages should lead toward drawings, sample evidence, and production assumptions. These files are scoped during RFQ so buyers know what can be verified before design freeze.
| Evidence | What It Includes | Buyer Use |
|---|---|---|
| Performance check | Voltage, no-load speed, rated-load speed, current, torque point, ratio, and temperature note. | Confirms the selected motor matches the required operating point before pilot procurement. |
| Mechanical file set | Outline drawing, shaft/flange revision, STEP/IGES availability, cable exit, connector, and label notes. | Lets mechanical teams freeze enclosure, mating part, harness route, and incoming inspection dimensions. |
| Application-specific test note | Noise, backlash, cycle life, thermal rise, radial load, EMI, or holding-force check as required. | Turns the market- or device-specific concern into a measurable sample approval criterion. |
| Production and export file | BOM option, EOL speed/current limits, RoHS/REACH or buyer file scope, packing, shipment destination. | Keeps repeat orders aligned after prototype approval and reduces qualification drift. |
CAD / STEP Request
Share the mating envelope and target duty data so sales engineering can confirm whether an existing outline drawing, STEP/IGES file, or custom shaft and flange proposal is suitable for your project.
Installation envelope, mounting pattern, shaft interface, and cable exit.
Voltage, loaded speed, torque, gear ratio, duty cycle, noise, and backlash limits.
Preferred CAD format, drawing revision, prototype quantity, destination, and compliance notes.
CAD files are shared by project fit and revision status. For custom shafts, flanges, cable routing, or gearbox interfaces, attach the mating drawing so the first CAD exchange uses the correct mechanical boundary.
They are common review candidates for compact mid-load electric valves, especially when the design needs more torque than 10mm or 12mm N20-style motors can provide. Final selection depends on breakaway torque, open time, voltage, and housing space.
Metal gears are usually selected for high torque, stalls, and hard end stops. POM or hybrid stages can be reviewed when lower acoustic noise, lower weight, or lighter duty operation matters more.
High-ratio planetary gearboxes can provide strong back-drive resistance, but shutoff and half-open holding behavior should be tested in the final valve mechanism under pressure and vibration.
Encoder, Hall, limit switch, or current sensing helps when the control board must confirm position, detect stalls, stop before a hard mechanical end stop, or support partial-open metering.
The useful test recreates real travel angle, pressure load, idle time, temperature, humidity, end stops, and current limit. A simple free-running motor life test does not prove the actuator will survive the valve load.
Breakaway torque, running torque, hold requirement, travel angle, open/close time, voltage, duty cycle, temperature range, sealing target, feedback method, and interface drawing are the key first inputs.
Application Qualification Review
Send the application module, target load, speed, torque, envelope, voltage, quantity, drawing status, and validation concerns. Sales engineering can then confirm whether this solution route, another product family, or an OEM assembly path is safer.
WhatsApp: +86 18857971991. Email: [email protected].
Inquiry Email
Include OD/length, voltage, torque, loaded speed, ratio, drawings, quantity, and destination.
Instant Chat
+86 18857971991
Fast channel for clarifying specs, drawings, and sample timing.
