Hybrid Tool + ReportStage1b research update: 2026-04-25Stage1c review update: 2026-04-25
10mm Coreless Motor Sizing Tool and Decision Report (includes `1020 10mm brushed coreless motor with gear` 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: 2026-04-21 | Last updated: 2026-04-25 | Review cadence: quarterly (tool + report smoke-tested)
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 |
|---|---|---|---|
| Alias phrase `1020 10mm brushed coreless motor with gear` was not explicitly answered in core sections. | High risk of intent mismatch and route-level ambiguity for do+know traffic. | Added alias phrase in heading, FAQ, anchor block, and route metadata while keeping a single canonical URL. | Closed in stage1b |
| Core RE10 reference voltage was ambiguous in the previous iteration (6V wording against PN data). | High risk of anchoring wrong rail assumptions during architecture review. | Corrected RE10 PN 256105 reference to 12V and added NRND note to prevent direct reuse as an active production target. | Closed in stage1b |
| Driver boundary section lacked hard electrical limits for low-voltage brushed paths. | High risk of selecting a topology that fails at startup surge or UVLO boundary. | Added DRV8833 VM/current envelope and explicit headroom checks in evidence and boundary sections. | Closed in stage1b |
| Ratio selection narrative ignored exact-ratio and tolerance boundaries. | Medium-to-high risk of treating nominal 1000:1 as exact output-speed commitment. | Added Pololu rev6.2 ratio/tolerance counterexample and mitigation actions. | Closed in stage1b |
| Compliance module was static and did not reflect latest REACH Candidate List movement. | Medium-to-high risk of RFQ release without refreshed substance-screening assumptions. | Added ECHA Candidate List snapshot (253 entries, latest inclusion date 2026-02-04) and linked legal-obligation note. | Closed in stage1b |
| Public standard for `1020` nomenclature-to-performance mapping is absent. | Medium risk of treating vendor model code 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
20 / month
`10mm coreless motor` (US keyword snapshot, 2026-03-29).
Alias query volume
0 / month
`1020 10mm brushed coreless motor with gear` is merged into this canonical URL.
Gear ratio envelope
4:1 to 1024:1
maxon GPX10 catalog page (EN-373, provisional data, accessed 2026-04-25).
10mm direct-drive reference
1.55 mNm nominal
maxon RE10 (PN 256105) reference point: 12V, 12,500 rpm, NRND flag (accessed 2026-04-25).
Driver rail guardrail
2.7V to 10.8V
TI DRV8833 VM operating range, with 1.5A continuous / 2A peak per H-bridge (Rev.E).
Regulatory drift marker
253 SVHC entries
ECHA Candidate List table snapshot showing 253 results and latest inclusion on 2026-02-04.
Who this is suitable for
- Need a fast pre-RFQ shortlist for 10mm brushed coreless direct-drive vs geared options.
- Need to verify whether a 1020-class 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 headroom guardrail | I_start <= I_peak_driver and VM_min <= V_rail_sag | Flags architectures that violate H-bridge peak current or minimum VM limits. |
| 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. |
| 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: 2026-04-25.
| Source | Date | Coverage | Known / Unknown |
|---|---|---|---|
| data/keywords/10mm-motor_triage_fixed.csv | 2026-03-29 | Canonical volume/CPC and alias mapping context. | Known |
| data/keywords/10mm-motor_queue.alias-merge-checklist.csv | 2026-03-29 | Alias `1020 10mm brushed coreless motor with gear` -> `/learn/10mm-coreless-motor`. | Known |
| OpenSpec change: add-kw-1020-10mm-brushed-coreless-motor-with-gear-page | 2026-04-21 | No standalone alias route; canonical-only decision. | Known |
| maxon RE10 product page (Part No. 256105) | Accessed 2026-04-25 | 10 mm diameter reference with nominal voltage 12V, 12,500 rpm no-load speed, 1.55 mNm nominal torque, 3.24 mNm stall torque, and NRND note. | Known |
| maxon GPX10 catalog page (EN-373) | Accessed 2026-04-25 | Ratio and stage table with efficiency/backlash/continuous torque trends; page marked as provisional data. | Known |
| Pololu Micro Metal Gearmotor Guide Rev 6.2 + product page 1595 | Accessed 2026-04-25 | Nominal 1000:1 maps to exact 986.41:1; no-load speed/current tolerances and <=25% stall-current operating recommendation. | Known |
| FAULHABER Precision Gearheads Technical Information | Accessed 2026-04-25 | Continuous torque exceedance reduces service life; intermittent torque is short-duration and limited duty. | Known with boundary |
| FAULHABER DC Motors Technical Information | Accessed 2026-04-25 | Typical commutation-system lifetime ranges and PWM frequency recommendation around 20 kHz. | Known with scope |
| TI DRV8833 datasheet (Rev. E) | Accessed 2026-04-25 | VM range 2.7V-10.8V, up to 1.5A continuous and 2A peak output current per H-bridge. | Known |
| EUR-Lex consolidated RoHS text (CELEX:02011L0065-20240801) | Accessed 2026-04-25 | Annex II restricted-substance concentration limits in homogeneous materials (e.g., Pb 0.1%, Cd 0.01%). | Known |
| ECHA Candidate List table | Accessed 2026-04-25 | Candidate List table shows 253 results and latest inclusion date visible as 2026-02-04; notes immediate obligations under REACH Articles 7/31/33 after inclusion. | Known with dynamic update |
| On-page sizing model (this tool) | 2026-04-25 | Pre-RFQ current/power/fit scoring; not a substitute for PN-level endurance validation. | Known |
| Cross-vendor standard mapping `1020` code 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: 2026-04-25. Facts without stable public evidence stay in the pending block.
| Topic | New fact | Applicable condition | Decision effect | Certainty |
|---|---|---|---|---|
| 10mm direct-drive boundary | maxon RE10 PN 256105 reference lists 12V nominal voltage, 12,500 rpm no-load speed, 1.55 mNm nominal torque, and 3.24 mNm stall torque. | Reference is one public PN with NRND status; use it as class-level boundary evidence, not as a direct new-design default. | Treat low-single-digit nominal mNm as direct-drive planning territory and switch to geared screening for sustained higher torque. | Known |
| 10mm gear ratio envelope | maxon GPX10 catalog shows available reductions from 4:1 to 1024:1. | Catalog values are platform-specific; output performance still depends on motor pairing and duty profile. | Use ratio-stage planning early instead of forcing direct-drive output-speed targets. | Known |
| Stage-count tradeoff | GPX10 stage data shows efficiency dropping 90% -> 59%, backlash 1.5deg -> 2.5deg, and max continuous torque rising 10 -> 150 mNm from 1 to 5 stages. | Values come from a catalog page explicitly marked as provisional. | High-ratio requests must budget efficiency loss, backlash growth, and provisional-data uncertainty together. | Known with boundary |
| Nominal ratio counterexample | Pololu 1000:1 class listing maps to exact 986.41:1 and includes explicit warning that stall specs are theoretical with strong <=25% stall-current operation guidance. | Guidance is vendor-family specific but demonstrates why nominal ratio text is insufficient for rpm commitments. | Do not commit output rpm/current from nominal labels; use exact-ratio lines and include load-validation in RFQ. | Known with vendor scope |
| Gearhead lifetime boundary | FAULHABER guidance states overload/excessive continuous torque can reduce service life; intermittent torque guidance assumes limited duty. | Applies as design-boundary guidance, not as guaranteed lifetime for every vendor. | Request continuous/intermittent torque evidence and duty profile from suppliers before award. | Known with boundary |
| Brushed control boundary | DRV8833 operating VM is 2.7V-10.8V with up to 1.5A continuous and 2A peak output current per H-bridge. | Applies when selecting DRV8833-class paths for compact brushed systems. | Below-rail or over-peak scenarios require architecture changes (driver, rail, or motor family) before sourcing. | Known |
| Compliance boundary | RoHS Annex II lists homogeneous-material concentration limits (e.g., Pb 0.1%, Cd 0.01%). | Applies to EEE placed on covered markets and categories with relevant obligations. | Treat supplier material declarations as gating documents before production RFQ release. | Known |
| Compliance drift signal | ECHA Candidate List table shows 253 entries, with latest visible inclusion dated 2026-02-04. | Candidate List is dynamic; obligations can trigger immediately after a new inclusion. | Freeze RFQ only after a current SVHC screening snapshot is attached to the sourcing package. | Known with dynamic update |
| Lifecycle planning boundary | FAULHABER DC motor guidance lists typical lifetimes around 1000-5000 h for precious-metal systems and >5000 h for graphite systems, with PWM guidance around 20 kHz. | Values are technology-level guidance; actual life depends on load profile, commutation, and thermal path. | Match commutation system and PWM strategy to lifecycle target before final motor-family shortlist. | Known with scope |
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 brushed coreless gearmotor 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 model code `1020` to guaranteed electrical/thermal limits. | No reliable cross-vendor public standard was identified in this iteration. | Model-code-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. |
Boundary and compliance checkpoints
Consolidates electrical constraints, regulatory updates, and counterexamples that can invalidate a seemingly feasible design.
Electrical boundary checks
Treat these as go/no-go guardrails before RFQ dispatch.
| Boundary | Source fact | Applicable scope | Required action |
|---|---|---|---|
| Driver operating VM floor | DRV8833 operating range is 2.7V to 10.8V. | Brushed H-bridge paths using DRV8833-class architectures. | If startup sag can drop below 2.7V, redesign rail/driver before RFQ. |
| Driver current headroom | DRV8833 supports up to 1.5A continuous and 2A peak per H-bridge. | Startup surge and stall-adjacent events in compact brushed systems. | Keep modeled startup current under peak limit with thermal margin, else switch driver or motor architecture. |
| PWM acoustic boundary | FAULHABER DC motor guidance recommends PWM around 20 kHz. | Brushed control paths with PWM speed regulation. | Set PWM above audible band during validation and confirm thermal/noise impact. |
| Reference PN availability risk | maxon RE10 PN 256105 page includes an NRND indicator. | When using public reference PNs as procurement defaults in new programs. | Treat this PN as a boundary benchmark; request active-lifecycle alternatives before design freeze. |
Compliance snapshot (dated)
This block is explicitly time-stamped and must be refreshed when regulations or candidate lists change.
| Topic | Data point | Date marker | Decision use |
|---|---|---|---|
| RoHS Annex II thresholds | 10 restricted substances; limits include Pb/Hg/Cr6+/PBB/PBDE/DEHP/BBP/DBP/DIBP at 0.1% and Cd at 0.01% (homogeneous material basis). | EUR-Lex consolidated text dated 2024-08-01 | Require homogeneous-material declarations and exemption mapping before production RFQ release. |
| REACH Candidate List size | Candidate List table shows 253 results, latest visible inclusion date 2026-02-04. | ECHA table snapshot accessed 2026-04-25 | Attach a timestamped SVHC screening report to supplier onboarding and re-check before PO release. |
| REACH immediate obligations note | ECHA Candidate List notes legal obligations can apply immediately after inclusion, including Articles 7, 31, and 33. | ECHA candidate-list notes accessed 2026-04-25 | Do not treat compliance screening as annual-only; add event-triggered checks to ECO/RFQ workflow. |
Counterexamples and failure modes
Prevents overconfidence by showing where commonly repeated rules fail in real procurement decisions.
| Common assumption | Counterexample | Decision impact | Mitigation |
|---|---|---|---|
| Nominal ratio label can be used as exact output-speed commitment. | Pololu nominal 1000:1 class uses exact 986.41:1 gearing and still requires load validation. | Output rpm promises can drift before manufacturing variance is even considered. | Quote exact ratio and tested output-speed window in RFQ acceptance criteria. |
| Catalog table values are automatically final production guarantees. | maxon GPX10 catalog page states data is provisional. | Unqualified reuse can lock decisions on pre-finalized values. | Request latest released datasheet or signed specification before award. |
| Any intermittent torque claim can be copied across vendors without scope mapping. | FAULHABER technical guidance makes intermittent limits explicitly duty-constrained and model-context dependent. | Duty misinterpretation can accelerate wear and reduce lifetime. | Use PN-level continuous/intermittent definitions and duty profile in validation protocol. |
| Reference PN can directly become new-project preferred part. | maxon RE10 PN 256105 is marked NRND on its product page. | Lifecycle and supply-risk can appear late in sourcing. | Use reference PN for boundary understanding, then shortlist active-life alternatives. |
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 brushed coreless direct drive (RE10/1020 reference class) | 3V-12V (vendor-family dependent) | 1-8 mNm (class-level planning range) | Very fast | Low to medium | Good for compact high-speed, low-load tasks | Counterexample: RE10 reference PN 256105 is NRND, and sustained medium/high torque requests usually require gearing or larger frame. |
| 10mm brushed coreless + GPX10-class gearhead | 3V-6V | 35-1000 mNm (catalog stage-dependent) | Medium | Medium | Good when output torque and lower output rpm dominate requirements | High ratio adds efficiency/backlash penalties; do not treat nominal ratio as exact output guarantee. |
| 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. |
| 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. |
Risk and mitigation
Covers misuse risk, cost risk, and scenario mismatch risk with direct mitigation actions.
Risk matrix
| Risk | Impact | Probability | Mitigation path |
|---|---|---|---|
| Treating `1020` model code 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. |
| 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 | Verify driver VM minimum and transient droop on oscilloscope before architecture freeze. |
| Thermal drift at high duty cycle without endurance curves | Medium | Medium | Run duty derating and include enclosure thermal path review. |
| RoHS compliance assumed without homogeneous-material declarations | High | Medium | Collect supplier declaration and exemption mapping before production release. |
| Alias query interpreted as separate SKU | Medium | Medium | Keep one canonical URL and answer alias intent explicitly in FAQ. |
| Reference PN copied into sourcing plan without lifecycle review | High | Medium | Verify NRND/active-life status and qualify alternate PNs before design freeze. |
Scenario examples
Each scenario includes assumptions, modeled output, and the minimum next action.
Scenario table
| Scenario | Assumption | Estimated result | Action |
|---|---|---|---|
| 1020 direct-drive request with medium torque demand | 3.7V rail, 9k rpm, 12 mNm target on 10mm brushed coreless 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 coreless + 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 driver floor | 2.0V rail with DRV8833-class floor constraints and startup surge | Not recommended without power-architecture change. | Shift to compatible driver/power architecture and retest startup behavior. |
Alias coverage anchors
Internal anchors keep `1020 10mm brushed coreless motor with gear` 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 brushed coreless motor options for compact drivetrain programs.
- Programs consolidating `10mm coreless motor` and `1020 10mm brushed coreless motor with gear` 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
10mm coreless motor: run sizing tool10mm coreless motor: methods and evidence10mm brushed motor: canonical alias anchor set10mm gear motor: gear ratio and duty boundary workflow10mm brushless motor: brushed-vs-brushless decision tool/report10mm coin vibration motor: actuator fit and risk report10mm vibration motor: cross-family fit tool and decision report1000 rpm small DC motor: geared-vs-direct fit tool/report6V DC motor boundary tool and report1020 brushed coreless motors: dedicated fit tool and report1020 coreless motor brushless or brushed: commutation decision page