Hybrid Tool + ReportStage1b research update: 2026-04-26
10mm Gear Motor Sizing Tool and Decision Report (includes `10mm geared motor` alias intent)
Use one canonical URL to finish two tasks in sequence: get an immediate motor-fit estimate, then verify decision quality with evidence, boundaries, alternatives, and risk controls.
Published: 2026-04-23 | Last updated: 2026-04-26 | Review cadence: quarterly
Tool layer: quick sizing input
Enter boundary-safe values first. Invalid input is blocked and recoverable.
Result layer: interpreted outputNo result yet
Result includes interpretation, uncertainty, and the next executable action.
Empty state
No calculation yet. Enter inputs and run the estimator to generate a fit decision.
Stage1b gap audit and closure status
Audit-first enhancement: each high-impact content gap is tracked with explicit remediation status.
Gap closure ledger
Blocker/high gaps are closed in-page; unresolved items remain explicitly marked for follow-up.
| Gap found | Decision impact | Stage1b action | Status |
|---|---|---|---|
| RE10 Part 256105 reference text previously implied a 6V baseline, which conflicts with the current maxon product page listing. | High risk of carrying wrong voltage assumptions into architecture and driver selection. | Corrected RE10 reference to 12V + 12,500 rpm + 1.55 mNm + 14,000 rpm max-speed + NRND status with refreshed source date. | Closed in stage1b |
| Gearhead section showed ratio envelope but did not expose stage-dependent efficiency/backlash penalties. | High risk of over-promising output torque/speed without accounting for stage-count losses. | Added GPX10 stage metrics (1-5 stages): efficiency 90%->59%, backlash 1.5°->2.5°, continuous torque/power boundaries. | Closed in stage1b |
| Low-voltage path (<2.7V) was treated as near-binary failure without clarifying available 1.65V-class driver alternatives. | Medium-to-high risk of discarding feasible low-voltage paths or choosing wrong power architecture too late. | Added DRV8833 vs DRV8212 voltage-window split and boundary notes; explicitly marked DRV8212 continuous-current data as pending datasheet-level confirmation. | Closed in stage1b |
| Compliance section focused on RoHS but did not carry REACH Article 33/7 obligations into procurement actions. | High risk of incomplete compliance files for EU-facing shipments even if RoHS declarations are present. | Added ECHA 2026-02-04 Candidate List update (253 entries), 0.1% w/w article threshold, and six-month notification timeline. | Closed in stage1b |
| Public standard for `10mm geared motor` nomenclature-to-performance mapping is absent. | Medium risk of treating vendor alias phrase as an engineering standard. | Marked as pending and required PN-level datasheet + drawing package before release. | Open (evidence pending) |
Report summary: conclusions and key numbers
Core conclusions are paired with quantifiable context before deep-dive sections.
Canonical query volume
0 / month
`10mm gear motor` (US keyword snapshot in this change proposal, 2026-04-06).
Alias query volume snapshot
Not published
`10mm geared motor` is treated as same-intent phrasing on this canonical URL.
Gear ratio envelope
4:1 to 1024:1
maxon GPX10 catalog page (EN-373, accessed 2026-04-26).
GPX10 stage efficiency window
90% to 59%
1 to 5 stages on maxon EN-373; higher stage counts trade efficiency for ratio.
RE10 boundary reference (PN256105)
12V, 12,500 rpm, 1.55 mNm
maxon product page (accessed 2026-04-26), with NRND lifecycle flag.
Driver floor split
2.7V vs 1.65V
TI DRV8833 (2.7V min) and DRV8212 (1.65V min) product pages (accessed 2026-04-26).
Driver current boundary
1.5A RMS / 2A peak
TI DRV8833 product page (accessed 2026-04-26).
REACH Candidate List
253 entries
ECHA update dated 2026-02-04; article obligations at 0.1% w/w remain active.
Reference lifecycle caveat
RE10 PN256105: NRND
Treat as class-level boundary data, not default production continuity.
Who this is suitable for
- Need a fast pre-RFQ shortlist for 10mm direct-drive vs geared options.
- Need to verify whether a 10mm geared motor should stay direct-drive or move to a gearhead.
- Need output-speed/torque feasibility check before choosing ratio and driver class.
- Need one decision memo with alias intent, evidence boundaries, and sourcing actions.
Who this is not suitable for
- Safety-critical products needing certified thermal/lifetime tests.
- Projects requiring guaranteed output-speed tolerance without supplier test data.
- Applications with explosive atmosphere compliance or IP67 guarantee.
- Mass production release without bench validation and sample approval.
Methods and evidence
Transparent formulas, dated sources, and explicit known/unknown boundaries.
Method flow
Input to estimate to boundary check to action path.
| Method block | Formula / rule | Decision value |
|---|---|---|
| Mechanical power estimate | P = 2 * pi * n / 60 * T | Converts speed and torque into shaft mechanical load. |
| Rated current estimate | I = P / (V * eta) + I_idle | Adds efficiency + idle current to avoid optimistic sizing. |
| Geared output speed estimate | n_out ~= n_motor / i | Provides first-pass speed estimate before tolerance and load corrections. |
| Startup surge estimate | I_start ~= 2.4 * I_rated | Used for driver and power rail margin planning. |
| Driver thermal check | P_driver ~= I_rms^2 * RDS(on) | RMS current governs thermal stress; peak-current labels are not continuous-use guarantees. |
| Direct-drive speed margin | speed_margin = n_ref_max - n_target | Flags when target speed exceeds RE10-class 14k rpm reference envelope. |
| Nominal-to-exact ratio guardrail | n_out exact ~= n_motor / i_exact | For high-ratio gearheads, use exact ratio and tolerance instead of nominal shorthand. |
| GPX10 stage-penalty check | eta_max(1..5) = 90%, 81%, 73%, 65%, 59% | Stage count increases ratio but typically lowers efficiency and increases backlash. |
| REACH article communication gate | SVHC > 0.1% (w/w) => Art.33 info flow; Art.7(2) notification when applicable | RoHS-only declarations are not sufficient for EU article-level chemical communication workflows. |
| Confidence score | Base 91 - condition penalties | Reduces confidence in high duty, high heat, low voltage cases. |
Source ledger
Time markers and certainty labels are mandatory for trust. Last refreshed: 2026-04-26.
| Source | Date | Coverage | Known / Unknown |
|---|---|---|---|
| openspec/changes/add-kw-10mm-gear-motor-page/proposal.md | 2026-04-06 | Canonical route and keyword snapshot context (`10mm gear motor`, volume shown as 0 in proposal). | Known |
| openspec/changes/add-kw-10mm-gear-motor-page/specs/rwa-pages/spec.md | 2026-04-06 | Alias `10mm geared motor` -> `/learn/10mm-gear-motor`. | Known |
| OpenSpec change: add-kw-10mm-gear-motor-page | 2026-04-26 | No standalone alias route; canonical-only decision. | Known |
| maxon RE10 product page (Part No. 256105) | Accessed 2026-04-26 | 12V reference with 12,500 rpm no-load speed, 14,000 rpm max speed, 1.55 mNm nominal torque, 0.36A stall current, and NRND lifecycle flag. | Known |
| maxon GPX10 catalog page (EN-373) | Accessed 2026-04-26 | Reduction 4:1/16:1/64:1/256:1/1024:1 with 1-5 stages; max efficiency 90/81/73/65/59%; average backlash 1.5°-2.5°; continuous input speed 12,000 rpm; catalog page marks data as provisional. | Known with provisional boundary |
| Pololu micro metal gearmotor product guide | Accessed 2026-04-23 | Nominal 1000:1 maps to exact 986.41:1; no-load speed +/-20%; stall current +/-50%; recommended continuous load <=25% of stall current. | Known with vendor scope |
| FAULHABER Precision Gearheads Technical Information | Accessed 2026-04-26 | Intermittent torque should be limited to short intervals and <=5% duty cycle; exceeding continuous torque can reduce service life; recommended motor steady-state temperature 60-70C to protect lubricant. | Known with boundary |
| FAULHABER DC Motors Technical Information | Accessed 2026-04-26 | Brushed-motor operational lifetime about 1,000-5,000 h under typical load, from several hundred hours to >25,000 h depending on conditions; PWM recommendation at/above 20 kHz. | Known with scope |
| TI DRV8833 product page + datasheet | Accessed 2026-04-26 | VM range 2.7V-10.8V, full-scale output current 1.5A RMS, peak output current 2A, and 360mOhm HS+LS RDS(on) at 25C. | Known |
| TI DRV8212 product page | Accessed 2026-04-26 | VM range 1.65V-12V, peak output current 4A, and 280mOhm HS+LS RDS(on) typical on product page. | Known with boundary |
| TI Application Report SLVA505A | Published 2024-07 (accessed 2026-04-26) | Driver current limits are thermally constrained by RMS current and conduction losses scale with I^2 * RDS(on). | Known |
| EUR-Lex Directive 2011/65/EU (RoHS baseline) | Accessed 2026-04-26 | RoHS framework and Annex II concentration-limit structure for homogeneous materials. | Known |
| EUR-Lex Directive (EU) 2015/863 | Accessed 2026-04-26 | Annex II expanded to 10 substances including DEHP/BBP/DBP/DIBP at 0.1%; general applicability from 2019-07-22 and medical/monitoring categories from 2021-07-22. | Known |
| ECHA news: Candidate List update | Published 2026-02-04 (accessed 2026-04-26) | Candidate List now contains 253 SVHC entries; article suppliers must communicate safe-use information when thresholds are exceeded. | Known |
| ECHA: Candidate List substances in articles | Accessed 2026-04-26 | Article-level threshold at 0.1% w/w and ECHA notification timing at six months after listing when notification conditions apply. | Known |
| On-page sizing model (this tool) | 2026-04-26 | Pre-RFQ current/power/fit scoring; not a substitute for PN-level endurance validation. | Known |
| Cross-vendor standard mapping `10mm geared motor` query wording to electrical/thermal limits | Pending | No reliable public standard dataset found; vendor PNs remain authoritative. | Pending confirmation / no reliable public dataset |
Stage1b research delta
Only net-new, source-verifiable information is included here. Each row states scope and decision consequence.
New evidence-backed decision facts
Update date: 2026-04-26. Facts without stable public evidence stay in the pending block.
| Topic | New fact | Applicable condition | Decision effect | Certainty |
|---|---|---|---|---|
| 10mm direct-drive boundary | maxon RE10 Part 256105 currently lists a 12V nominal point with 12,500 rpm no-load speed, 14,000 rpm max speed, 1.55 mNm nominal torque, 0.36A stall current, and NRND status. | Reference is one public PN, used as a class-level boundary indicator rather than a universal motor limit. | Use this PN for class-level boundary checks, not as default continuity-safe sourcing for mass-production RFQs. | Known |
| Stage-count tradeoff (GPX10) | maxon EN-373 catalog shows 1-5 stage efficiency falling from 90% to 59% and average backlash increasing from 1.5 degrees to 2.5 degrees, with 12,000 rpm continuous input speed limit. | Catalog data is platform-specific and explicitly provisional. | When selecting high ratios, reserve margin for stage losses/backlash growth and lock final commitments only on quote-controlled data. | Known with provisional boundary |
| Low-voltage driver path split | TI DRV8833 lists 2.7V minimum VM with 1.5A RMS / 2A peak, while TI DRV8212 lists 1.65V minimum VM with 4A peak and 280mOhm HS+LS RDS(on) on its product page. | DRV8212 product page emphasizes peak current; continuous thermal capability still requires datasheet + PCB thermal validation. | For 1.65V-2.7V programs, do not auto-reject architecture, but force a driver thermal validation gate before RFQ freeze. | Known with boundary |
| Nominal-ratio counterexample + stall-current margin | Pololu guidance shows nominal 1000:1 equals exact 986.41:1, no-load speed tolerance near +/-20%, and recommends <=25% stall current for continuous operation. | Tolerance and load guidance are vendor-family-specific but directly illustrate common micro-gearmotor pitfalls. | Do not commit exact output rpm from nominal labels and avoid designing continuous operation close to stall regions. | Known with vendor scope |
| Driver capability boundary | TI DRV8833 guidance lists 1.5A RMS continuous and 2A peak output current with 360mOhm combined HS+LS on-resistance. | Applies when DRV8833-class topology is selected for brushed 10mm systems. | Map estimator rated current to RMS limit and startup surge to peak limit before driver selection is frozen. | Known |
| Driver thermal interpretation rule | TI SLVA505A states motor-driver thermal stress is governed by RMS current and conduction losses scale with I^2 * RDS(on). | Rule is generic to MOSFET-based H-bridges and should be applied alongside each driver datasheet. | Do not treat peak-current labels as steady-state capability; run thermal checks on RMS current profile. | Known |
| Gearhead overload duty boundary | FAULHABER precision gearhead guidance limits intermittent torque use to short intervals and <=5% duty cycle, and recommends motor steady-state temperature around 60C-70C to protect lubricant life. | Applies as boundary guidance; exact duty allowances vary by gearhead family. | Treat intermittent torque as exception mode; force thermal + duty evidence in RFQ technical package. | Known with boundary |
| RoHS scope boundary | Directive (EU) 2015/863 extends Annex II to 10 restricted substances, including four phthalates at 0.1%, with staged applicability dates in 2019 and 2021. | Applies to covered EEE categories and relevant exemption context. | RFQ compliance packs must include phthalate declarations, not just Pb/Cd/Hg style metal declarations. | Known |
| REACH article communication boundary | ECHA Candidate List update dated 2026-02-04 states the list contains 253 SVHC entries; article obligations remain tied to 0.1% w/w threshold and candidate-list notification timelines. | Article 33 communication and Article 7(2) notification applicability depend on article-level composition and supply-chain role. | Add REACH article-level declarations and six-month notification checks to RFQ compliance gate, not only RoHS declarations. | Known |
Pending confirmation / no reliable public data
Evidence is insufficient for strong conclusions in these areas.
| Open question | Why evidence is insufficient | Decision impact |
|---|---|---|
| Cross-vendor, normalized life curves for 10mm gear motor outputs under matched duty/load profiles. | Public datasets use different rigs, lubrication packages, and load profiles. | Cannot issue strong life claims; procurement should require PN-level endurance report. |
| Public standard linking alias phrase `10mm geared motor` to guaranteed electrical/thermal limits. | No reliable cross-vendor public standard was identified in this iteration. | Alias-wording-only purchasing remains high-risk without PN-level datasheets. |
| Backlash growth vs service life across different 10mm gearhead platforms. | Most public publications report initial backlash but not life-cycle drift under matched duty. | Backlash-sensitive applications need vendor endurance data before freezing architecture. |
| Continuous-current derating model for DRV8212-class low-voltage paths under specific PCB thermal designs. | Product page exposes voltage/peak-current and RDS(on), but continuous thermal envelope remains design-dependent and needs datasheet plus board-level validation. | Low-voltage rails can be misclassified as safe if peak-current figures are used without thermal qualification. |
Alternative comparison
Use reproducible dimensions (voltage, torque, response, cost, fit) instead of generic claims.
Option comparison table
If a value is unavailable in your project context, keep it as N/A and request supplier evidence.
| Option | Voltage band | Torque band | Dynamic response | Cost class | Best-fit scenario | Boundary / counterexample |
|---|---|---|---|---|---|---|
| 10mm direct-drive (RE10-class reference) | 3V-12V (PN-specific) | 1-8 mNm (class-level planning range) | Very fast | Low to medium | Good for compact high-speed, low-load tasks | Counterexample: sustained medium/high torque requests usually require gearing or larger frame; RE10 Part 256105 reference is NRND. |
| 10mm motor + GPX10-class gearhead | 3V-12V (motor-dependent) | 35-1000 mNm (catalog stage-dependent) | Medium | Medium | Good when output torque and lower output rpm dominate requirements | High ratio adds efficiency/backlash penalties (max efficiency 90%->59%, backlash 1.5°->2.5°); catalog values are provisional. |
| 10x12 micro metal gearmotor class (commodity reference) | 3V-6V | Vendor- and ratio-specific | Fast | Low to medium | Useful for cost-sensitive builds needing common ratio options | Ratio nomenclature and tolerance must be read from exact-ratio tables, not nominal labels alone; continuous load should stay well below stall-current regions. |
| Mini BLDC + gearhead | 5V-12V | 15-120 mNm (architecture-dependent) | Fast | Medium to high | Better lifetime/noise at the cost of controller complexity | Often unsuitable for low-voltage and cost-constrained 10mm programs. |
Driver window and rail boundary
Low-voltage rails need explicit driver-window mapping, not one-line pass/fail labels.
Driver envelope table
Keep unknowns visible: peak-current labels alone are insufficient for continuous thermal approval.
| Driver path | VM window | Current window | Conduction reference | Best-fit use | Boundary / counterexample |
|---|---|---|---|---|---|
| TI DRV8833 | 2.7V-10.8V | 1.5A RMS / 2A peak | 360mOhm HS+LS | Mainstream low-voltage rails above 2.7V with known RMS profile. | Below 2.7V VM, UVLO/undervoltage behavior can dominate startup. Peak labels are not continuous current guarantees. |
| TI DRV8212 | 1.65V-12V | 4A peak (continuous value depends on thermal design) | 280mOhm HS+LS | 1.65V-2.7V rails that need integrated H-bridge path and lower conduction-loss reference. | Continuous-current claims must come from datasheet + PCB thermal evidence, not product-card peak current. |
Risk and mitigation
Covers misuse risk, cost risk, and scenario mismatch risk with direct mitigation actions.
Risk matrix
| Risk | Impact | Probability | Mitigation path |
|---|---|---|---|
| Treating `10mm geared motor` alias phrase as a standardized performance specification | High | Medium | Require PN-level datasheet + drawing package and verify electrical constants before RFQ freeze. |
| Selecting ratio by nominal label only (ignoring exact ratio and tolerance) | High | High in high-ratio requests | Translate nominal ratio into exact-ratio/tolerance output-speed range and validate on load. |
| Interpreting driver peak-current rating as continuous current capability | High | Medium | Map estimated rated current to RMS limits and startup surge to peak limits, then run thermal checks with I^2 * RDS(on). |
| Operating above continuous gearhead torque envelope | High | Medium | Use vendor continuous/intermittent torque rows and duty-cycle limits as procurement gates. |
| Undersized startup current budget | High | Medium | Reserve >=2.4x rated current on driver + power path. |
| VM droop below motor-driver floor (or UVLO threshold) | Medium | Medium | Split low-voltage paths by driver floor (2.7V-class vs 1.65V-class), then verify transient droop and startup waveform on oscilloscope. |
| Thermal drift at high duty cycle without endurance curves | Medium | Medium | Run duty derating and include enclosure thermal path review. |
| RoHS-only compliance assumed while REACH article obligations are skipped | High | Medium | Collect supplier declaration and exemption mapping plus REACH Candidate List article declarations (0.1% w/w communication and notification checks). |
| Using product-card peak current as continuous-current approval in low-voltage driver selection | High | Medium | Require datasheet thermal modeling and board-level validation before approving 1.65V-class paths for repetitive duty. |
| Using provisional catalog values as frozen procurement commitments | Medium | Medium | Treat catalog numbers as planning references and lock final commitments to supplier technical offers and drawings. |
| Selecting an NRND reference PN for new mass-production plans | High | Medium | Request active-production alternatives and lifecycle statements before awarding production RFQ. |
| Alias query interpreted as separate SKU | Medium | Medium | Keep one canonical URL and answer alias intent explicitly in FAQ. |
Pre-RFQ release gates
Each gate has a measurable check and a pass condition to prevent soft assumptions from entering purchase decisions.
Verification gate checklist
| Gate | Measurement | Pass condition | Reference basis |
|---|---|---|---|
| Current waveform gate | Capture startup peak and steady-state RMS current at min/nom/max voltage and target duty. | RMS current stays below selected driver continuous limit; startup peak respects pulse/thermal envelope. | TI DRV8833 + SLVA505A thermal interpretation |
| Gearhead duty gate | Map requested duty profile against continuous/intermittent torque definitions. | Intermittent overload remains short-interval and <=5% duty; continuous torque stays within rated envelope. | FAULHABER precision gearheads technical info |
| Steady-state thermal gate | Run stabilized thermal test at representative load and enclosure condition. | Motor steady-state temperature stays near 60C-70C guidance window for gearhead lubricant protection. | FAULHABER precision gearheads technical info |
| EU compliance gate | Collect RoHS Annex II + REACH Candidate List article declarations at PN and article level. | 0.1% w/w SVHC communication obligations are met and any required ECHA notification timeline is tracked. | EUR-Lex RoHS + ECHA Candidate List obligations |
Scenario examples
Each scenario includes assumptions, modeled output, and the minimum next action.
Scenario table
| Scenario | Assumption | Estimated result | Action |
|---|---|---|---|
| 10mm geared motor direct-drive request with medium torque demand | 3.7V rail, 9k rpm, 12 mNm target on 10mm direct-drive motor without gearhead | Conditional to not recommended for continuous duty. | Evaluate geared architecture and validate thermal rise before shortlist lock. |
| High-ratio low-speed output from nominal-only ratio | Nominal 1000:1 selected without exact-ratio/tolerance conversion | Conditional fit with high spec-risk. | Recalculate with exact ratio and tolerance window, then validate output speed on load. |
| 10mm geared motor + moderate-ratio gearhead path | 6V rail, motor 10k rpm class, 64:1 ratio target, 45% duty | Conditional fit (gearhead optional). | Request A/B samples with two ratio options and compare backlash/temperature drift. |
| Low-voltage brushed path near 2.7V driver floor | 2.0V rail with DRV8833-class floor constraints and startup surge | Conditional with architecture split required. | Evaluate 1.65V-class driver path (or boosted rail) and validate continuous thermal behavior before RFQ lock. |
| Startup surge passes bench, but RMS current exceeds driver thermal envelope | Estimated rated current >1.5A with repetitive duty; selected driver only has 2A peak margin. | Conditional to not recommended for production without driver change. | Re-select driver on RMS thermal rating, then validate with current waveform and temperature-rise tests. |
| RFQ drafted against RE10 Part 256105 only | Program treats RE10 reference PN as default production part without lifecycle screening. | Conditional with sourcing continuity risk. | Add active-PN alternatives and lifecycle statement requirement before RFQ release. |
| EU shipment uses RoHS declaration only | Compliance packet omits REACH Candidate List article-level communication checks. | Conditional with compliance gap risk. | Add Article 33 information flow and Candidate List notification review into the procurement release checklist. |
Alias coverage anchors
Internal anchors keep `10mm geared motor` traffic on this canonical page without split routes.
Decision FAQ
Questions are grouped by intent, not glossary-only definitions.
B2B application fit, OEM options, and inquiry handoff
Move from estimator output to executable sourcing with factory customization scope and compliance-ready RFQ preparation.
Application fit
Projects that match this page's pre-RFQ scope.
- Teams screening 10mm motor + gearhead options for compact drivetrain programs.
- Programs consolidating `10mm gear motor` and `10mm geared motor` on one canonical URL.
- Projects that need explicit direct-drive vs gearhead boundaries before RFQ submission.
OEM options
Customization knobs available from factory-side engineering.
- Winding/Kv and no-load-speed tuning to match your voltage and output-speed envelope.
- Gearhead ratio, stage count, backlash target, shaft geometry, and connector customization.
- Lead-wire, insulation, and packaging customization aligned to your assembly flow.
Trust and compliance
Evidence gates required before production commitment.
- Collect RoHS/REACH declarations with homogeneous-material granularity before order release.
- Validate startup surge, thermal rise, and duty-cycle life on PN-level samples.
- Keep this page as pre-RFQ guidance; final claims require manufacturer qualification files.
Related fit check
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