Hybrid Page: Tool + Decision Report
Arc Fan Ferrite Magnet Y35 Checker + Report
The arc fan ferrite magnet y35 checker solves tool intent first: run a Y35 arc-fan screening with deterministic output, boundary notes, and next action. Lower sections add source-backed ranges, method, risk tradeoffs, and procurement controls so decisions are defensible.
Published: April 29, 2026
Evidence updated: April 29, 2026 (stage1b deep-report enhancement round 2, source re-verified)
SERP reviewed: April 29, 2026
Review cadence: Re-verify SERP intent and evidence set every 6 months, or earlier when policy/material signals shift.
Distinct angle: one canonical URL for arc-fan Y35 mixed intent (calculator + decision report), not split pages.
Tool Layer: Run The Y35 Fit Checker
Input geometry, duty, and assumption band. Output includes verdict, uncertainty, boundary notes, and minimum next step.
Input + Action
Defaults represent a common fan-motor Y35 arc baseline. Any input change clears previous output to avoid stale decisions.
Empty state: run the checker to generate your result.
Output includes fit verdict, uncertainty, boundary conditions, and minimum continue path.
Report Summary: Core Conclusions With Numbers
Middle layer converts tool output into decision-ready conclusions, suitability boundaries, and evidence pointers.
SERP intent is transactional first, not theory-first
Top SERP is dominated by supplier listing and RFQ pages
The query pattern for arc fan ferrite magnet Y35 is mostly dimension + grade + quote workflows. Tool-first interaction is therefore mandatory before long-form explanation.
Suitable: Users needing a fast go/no-go signal before RFQ packaging.
Not suitable: Users expecting one fixed catalog SKU with no geometry or duty validation.
Evidence IDs: S1, S2, S3
Y35 band is adequate for many fan-motor use cases but margin-sensitive
Typical Y35 Br/Hcb/BHmax bands: 0.40-0.45 T / 215-239 kA/m / 31-38 kJ/m3
Public ferrite grade tables show usable performance, but application success depends on thermal path, air-gap control, and retention path rather than grade label alone.
Suitable: Cost-sensitive fan motors with moderate speed and explicit thermal assumptions.
Not suitable: Very high back-EMF density targets inside compact envelopes.
Evidence IDs: S4, S5, S6
Supply resilience now matters as much as unit cost
USGS 2026: U.S. net import reliance is 67% (2025e); IEA N-1 case leaves rare earth/graphite at only 35-40% coverage in 2035
Base-case supply balance does not equal disruption resilience. Ferrite-led programs still need dual-source and schedule buffers when largest-supplier disruption scenarios are considered.
Suitable: Programs with release milestones and supplier alternates designed up front.
Not suitable: Single-source programs that only optimize immediate unit price.
Evidence IDs: S7, S8
Compliance and material disclosure should be baked into RFQ
RoHS Annex II uses homogeneous-material limits (Lead 0.1%, Cadmium 0.01%); ECHA Candidate List updates include n-hexane on February 4, 2026
RFQ packages should include coating/binder declarations, homogeneous-material screening scope, and a dated SVHC monitoring checkpoint before pilot freeze.
Suitable: Teams with quality-gate ownership and traceable document control.
Not suitable: Projects that treat compliance as post-order paperwork.
Evidence IDs: S9, S10, S11, S12
Secondary CTA: move from screening to action
If the checker output is directional but not release-ready, request a constrained boundary review before RFQ freeze.
Method, Evidence, And Assumptions
This section exposes how the checker logic is constructed, where data came from, and where uncertainty remains.
Method flow
Deterministic flow: inputs -> derived metrics -> boundary gates -> verdict -> action.
Tool layer assumptions
Uses Y35 property bands, temperature coefficient approximation, gap penalty, and retention screening to produce transparent early-stage verdicts.
Report layer role
Adds source credibility, policy context, and risk controls so users can justify next engineering and procurement actions.
Evidence register
Public sources used in this page. Data uncertainty is shown explicitly instead of hidden.
| ID | Source | Key data | Context | Date |
|---|---|---|---|---|
| S1 | AOMAGNET product page (arc Y35 ferrite listing pattern) | SERP-leading listing style uses custom-size inquiry and grade matrix, indicating RFQ-style user intent. | Supports tool-first structure and explicit input fields (OD/ID/angle/grade/duty). | Accessed April 29, 2026 |
| S2 | YOHO Magnet product listing | Arc ferrite Y35 pages request custom dimensions, tolerance, and process details before quote. | Confirms transactional intent and need for structured input rather than generic article-first flow. | Accessed April 29, 2026 |
| S3 | supermagnete Y35 explanation (standard context) | Explains Y35 naming under Chinese SJ standard context and cross-standard mapping caveat. | Used to justify explicit uncertainty messaging for grade-name equivalence across suppliers. | Accessed April 29, 2026 |
| S4 | Eclipse / Bunting ferrite datasheet (PDF) | Publishes Chinese and IEC ferrite property bands including Y35 and temperature coefficients. | Used for checker data-band defaults and thermal coefficient assumptions. | Accessed April 29, 2026 |
| S5 | Stanford Magnets ferrite properties summary | Provides grade-based Br/Hcb/Hcj/(BH)max ranges with conversion table presentation. | Used as secondary cross-check for Y35 band reasonableness and disclosure of range variance. | Accessed April 29, 2026 |
| S6 | Newland sintered ferrite property table (PDF mirror) | Contains multi-grade ferrite property ranges and standard cross-reference blocks. | Used to keep conservative/typical/aggressive data-band switch explicit on-page. | Accessed April 29, 2026 |
| S7 | USGS Mineral Commodity Summaries 2026 - Rare Earths | U.S. rare-earth compounds/metals net import reliance reached 67% (2025e). Import sources (2021-24): China 71%, Malaysia 13%, Japan 5%, Estonia 5%. | Used to quantify concentration exposure and trigger buffer/re-quote cadence by calendar events. | Published February 2026 (MCS 2026 updated through April 2026) |
| S8 | IEA Global Critical Minerals Outlook 2025 (overview of key minerals) | In 2035 STEPS, top-three nickel supply is projected at 85% (up from 75% in 2024); China is projected near 80% of battery-grade graphite and rare-earth refining; N-1 coverage for graphite/rare earths is only 35-40%. | Provides counterexample to base-case comfort: globally supplied does not mean resilient under largest-supplier disruption. | Published 2025, accessed April 29, 2026 |
| S9 | European Commission C(2023)7088 final (RoHS delegated directive) | States Annex II currently restricts 10 substance groups and explicitly reiterates homogeneous-material thresholds including Lead 0.1% and Cadmium 0.01%. | Used to define compliance threshold boundaries directly in RFQ and release-gate checklists. | Issued October 25, 2023, accessed April 29, 2026 |
| S10 | European Commission SWD(2023)760 (RoHS evaluation working document) | Confirms 10-substance Annex II set and concentration thresholds (0.1% for most restricted substances, 0.01% for cadmium) in homogeneous materials. | Used to separate component-level declarations from homogeneous-material lab scope. | Published December 7, 2023, accessed April 29, 2026 |
| S11 | ECHA Candidate List table (REACH Article 59 publication) | Candidate List table shows n-hexane included on February 4, 2026 and indicates ongoing dataset maintenance transition to ECHA CHEM. | Used to set SVHC refresh cadence and prevent stale declaration packets in long-cycle RFQs. | ECHA table accessed April 29, 2026 |
| S12 | ECHA Registry of SVHC intentions (n-hexane detail record) | n-hexane record shows MSC agreement date (December 9, 2025) and Candidate List inclusion date (February 4, 2026). | Used for dated compliance checkpoints and to justify quarterly declaration refresh as minimum cadence. | Accessed April 29, 2026 |
Stage1b gap audit: what changed in this round
This audit tracks prior weak spots, concrete information increments, and remaining uncertainty that is still pending confirmation.
| Gap | Before | Increment added | Remaining uncertainty | Evidence IDs |
|---|---|---|---|---|
| Supply-risk claim lacked hard numbers and dated events | Page stated risk was elevated but did not expose measurable concentration values and timeline markers. | Added USGS 2026 figures (67% U.S. net import reliance; 71/13/5/5 import split) plus explicit 2025 export-control timeline context. | Program-specific lead-time impact is still pending confirmation / 暂无可靠公开数据 without supplier contract terms. | S7 |
| Base-case supply comfort had no stress-case counterexample | Comparison focused on material bands/cost without disruption-mode boundary. | Added IEA N-1 scenario signals (2035 graphite/rare-earth supply only 35-40% of N-1 demand) and reflected this in scenario/risk sections. | Exact pass/fail under each customer demand profile requires internal demand forecasts not publicly available. | S8 |
| Compliance section lacked legal threshold precision | RoHS/REACH guidance was directional and not tied to numeric homogeneous-material limits. | Added RoHS Annex II threshold references (0.1% for most substances, 0.01% for cadmium) and 10-substance scope disclosure. | Per-layer lab decomposition plans for each supplier remain pending confirmation before release. | S9, S10 |
| SVHC timing was generic and not release-gate ready | Candidate List mention existed without dated update anchors for review cadence. | Added dated SVHC evidence markers (n-hexane inclusion on February 4, 2026; MSC agreement December 9, 2025). | Future list additions are unknown; quarterly refresh is minimum and may need higher frequency on regulatory alerts. | S11, S12 |
Policy timeline signals with dates
Date-stamped events are translated into executable sourcing actions.
| Date | Signal | Decision impact | Action | Evidence IDs |
|---|---|---|---|---|
| April 2025 | China tightened export controls for selected rare-earth alloys/compounds/metals/oxides. | Programs with broad magnet portfolios can see sourcing-window volatility even when ferrite is the current target path. | Set event-based re-quote trigger and preserve at least one validated alternate source. | S7 |
| October 2025 | Export-control scope was expanded to additional rare-earth elements. | Policy scope changed within the same year, increasing risk of planning with stale assumptions. | Tie procurement checkpoints to dated policy snapshots instead of annual static assumptions. | S7 |
| November 2025 | October controls were suspended for one year while April controls remained in effect. | Policy easing can be partial; binary risk framing (on/off) is misleading. | Use partial-relief logic in RFQ timing: keep buffers unless all relevant controls are fully cleared. | S7 |
| 2035 scenario view (published 2025) | In IEA N-1 assessment, graphite/rare-earth remaining supply covers only 35-40% of N-1 demand. | Global balance can look adequate while disruption resilience is still weak. | Add N-1 resilience review as a separate release gate from engineering fit. | S8 |
Compliance thresholds and applicability
Scope and numeric thresholds are separated from unknown items that still require lab or supplier evidence.
| Gate | Requirement | Boundary | Minimum action | Evidence IDs |
|---|---|---|---|---|
| RoHS threshold gate | Apply Annex II concentration limits by homogeneous material for EEE components. | Most restricted substances 0.1% by weight; cadmium 0.01% by weight. | Require supplier declaration plus test method/scope statement before pilot freeze. | S9, S10 |
| Restricted-substance scope gate | Check full Annex II set, including four phthalates, rather than legacy six-substance-only checklists. | Current Annex II scope is 10 restricted substances/groups. | Use checklist templates that explicitly enumerate all 10 restricted entries. | S9, S10 |
| SVHC freshness gate | Treat REACH Candidate List as a moving target with dated review cadence. | Evidence marker: n-hexane Candidate List inclusion dated February 4, 2026. | Set quarterly minimum declaration refresh and trigger immediate recheck after official updates. | S11, S12 |
| Open-data evidence boundary | Do not claim release-ready compliance without lot-level binder/coating evidence. | Public sources do not provide supplier-lot decomposition or fatigue-lifecycle compliance proof for your exact BOM. | Label as pending confirmation / 暂无可靠公开数据 and run targeted lab validation before SOP. | S4, S5, S6, S9, S10 |
Boundary table
Fit/caution/fail windows define how verdict states are assigned and recovered.
| Gate | Fit | Caution | Fail | Minimum action |
|---|---|---|---|---|
| Thermal margin (screening) | >= 30 C | 15 to <30 C | < 15 C | Adjust cooling path, duty, or geometry before lock-in; do not proceed to RFQ freeze. |
| Tip speed at OD | <= 55 m/s | >55 to 75 m/s | > 75 m/s | Increase mechanical retention depth and revalidate adhesive + fixture strategy. |
| Back-EMF gap versus target | |gap| <= 10% | >10% to 18% | > 18% | Re-open pole/geometry assumptions; do not rely on grade-only change. |
| Retention margin | >= 3 MPa | 1.5 to <3 MPa | < 1.5 MPa | Move from adhesive-only to mechanical retention-backed architecture. |
| Demag risk index | <= 40 | >40 to 65 | > 65 | Collect BH loop validation and broaden supplier data before release decision. |
Known vs unknown
Unknown fields are surfaced explicitly to prevent overconfidence.
| Topic | Known | Unknown | Treatment |
|---|---|---|---|
| Y35 magnetic property ranges | Public tables consistently show usable Y35 Br/Hcb/BHmax bands. | Exact delivered values per vendor lot, sintering route, and process capability. | Use conservative band by default until incoming data confirms uplift. |
| Thermal coefficient behavior | Public ferrite datasheets provide temperature-coefficient guidance. | Real rotor thermal gradient under end-use duty cycle. | Run thermal instrumentation before release freeze. |
| Retention durability lifecycle | Static shear benchmarks exist for adhesive systems. | Long-cycle fatigue performance for the exact rotor surface and process window. | Label as pending confirmation and execute accelerated durability validation. |
| Supply resilience over program horizon | Macro concentration and policy volatility are documented by USGS/IEA. | Future lead-time and pricing under regional shocks. | Maintain dual-sourcing and periodic re-plan checkpoints. |
| RoHS homogeneous-material verification depth | RoHS Annex II thresholds apply by homogeneous material (most 0.1%, cadmium 0.01%). | Full lab decomposition coverage for each coating/binder layer is often missing at RFQ stage. | Mark as pending confirmation / 暂无可靠公开数据 until supplier test scope and lot trace are delivered. |
| SVHC list drift during long RFQ cycles | ECHA Candidate List records include dated additions such as n-hexane on February 4, 2026. | Which additional SVHC entries may be added before SOP for the exact binder/coating chemistry. | Require quarterly declaration refresh and event-triggered recheck after official list updates. |
Pending-confirmation boundary
Supplier-lot Cpk distribution, full coating/binder layer decomposition, and long-cycle retention fatigue evidence are not reliably available in public datasets. They remain pending confirmation / 暂无可靠公开数据 until project-specific validation is completed.
Comparison And Tradeoffs
Compare Y35 path with nearby options before locking architecture or procurement assumptions.
Material and architecture comparison
Data bands and recommendations are screening-level and must be validated per supplier lot.
| Option | Br band | (BH)max band | Thermal behavior | Cost signal | Use when | Avoid when |
|---|---|---|---|---|---|---|
| Y35 ferrite arc fan path | 0.40-0.45 T | 31-38 kJ/m3 | Thermally robust if hotspot margin and retention window are both controlled | Low to medium | Cost-sensitive fan motor with moderate magnetic loading target | Tight package with very high back-EMF requirement or single-source procurement assumptions |
| Y30BH ferrite fallback | 0.38-0.40 T | 27-31 kJ/m3 | Generally robust but lower magnetic output reserve | Low | Lower-speed fan or relaxed package envelope | High-speed compact rotor requiring stronger flux reserve |
| NdFeB SH compact path | Higher than ferrite bands | Much higher than ferrite bands | Needs strict thermal and corrosion controls | Medium to high, with higher policy/price volatility exposure | Compact package and high power-density requirement | Program is dominated by cost and resilient sourcing priority |
| Ferrite + winding redesign hybrid | Ferrite-level | Ferrite-level with topology compensation | Can be stable if electromagnetic redesign is complete | Medium (engineering effort) | Need ferrite economics with improved output consistency | No time for redesign or validation loop |
Scenario outcomes
Scenario-based interpretation keeps the checker actionable across real operating contexts.
| Scenario | Input pattern | Likely outcome | Next action |
|---|---|---|---|
| Home HVAC fan baseline | OD72/ID54, arc24deg, 12 segments, 3600 rpm, ambient40C, rise75C, gap0.8mm | Usually fit if thermal margin stays above 30 C and back-EMF gap remains within ±10%. | Package RFQ with tolerance and magnetization-direction details. |
| Automotive radiator fan high ambient | OD84/ID62, 4200 rpm, ambient55C, rise90C, gap1.0mm | Often review-required due to thermal margin compression and retention pressure. | Prioritize cooling-path assumptions and retention architecture before PO timing. |
| Compact high-speed blower | OD66/ID52, 6800 rpm, narrow gap, higher adhesive grade | Tip-speed and demag-risk may trigger not-fit unless geometry or duty is relaxed. | Evaluate geometry resize or NdFeB/hybrid fallback in parallel. |
| Cost-down redesign from rare-earth path | Ferrite migration without winding/system redesign | Back-EMF gap frequently exceeds threshold even if thermal looks acceptable. | Run winding and pole optimization instead of direct material substitution. |
| Single-source plan under policy shock (counterexample) | Engineering fit is acceptable, but procurement assumes one approved source with no timeline buffer | Execution risk can still be high when largest-supplier disruption scenarios are applied; schedule slips may appear even without geometry changes. | Run dual-source qualification and define re-quote trigger points tied to policy updates. |
Risk Register
Decision risk is mapped by probability, impact, trigger, and executable mitigation path.
Risk matrix
Visual priority map for engineering and sourcing teams.
High impact/high probability risks should be converted into release gates, not advisory notes.
Risk details
| Risk | Probability | Impact | Trigger | Mitigation |
|---|---|---|---|---|
| Grade label mismatch across supplier standards | Medium | High | Y35 declared without full Br/Hcb/Hcj test report and batch statistics | Request BH data with test conditions and accept/reject limits. |
| Thermal demag under real duty | Medium | High | Hotspot or rotor-surface temperature higher than model assumptions in sustained duty | Instrument prototype, validate margin under worst-case ambient and duty cycle. |
| Adhesive-only retention failure at high speed | Low | High | Retention margin below 3 MPa or cure-window/process variability | Add mechanical retention features and process control checkpoints. |
| Policy-driven procurement disruption | Medium | High | Export-control or logistics shock affecting magnet/raw-material flows despite base-case supply comfort | Dual-source strategy, timeline buffers, and periodic re-quote cadence. |
| False confidence from global base-case supply headlines | Medium | High | Program planning uses base-case market balance but ignores N-1 disruption scenarios for graphite/rare-earth pathways | Add N-1 procurement drill at each major gate and keep validated fallback BOM paths. |
| Compliance disclosure gaps | Medium | Medium | Missing RoHS/REACH declarations for coating or binder systems | Make declaration pack a release gate in RFQ checklist. |
Risk disclosure
This page is a screening and decision-support surface. It does not replace full electromagnetic, thermal, mechanical, reliability, and compliance validation.
FAQ By Decision Intent
Grouped FAQ keeps mixed do+know intent actionable across engineering, procurement, and compliance workflows.
Intent Clarification (Do + Know)
Engineering Boundaries
Sourcing, Compliance, And Execution
Related internal pages
Contextual links strengthen discoverability and prevent duplicate route fragmentation.
Main CTA: send your Y35 arc-fan RFQ package
Include checker result, geometry drawing, tolerance, duty-cycle assumptions, and compliance declarations in one request.
Minimum package: OD/ID/axial length, angle, segment count, magnetization direction, tolerance, and coating/binder details.
If thermal margin is under 30 C, include measured hotspot assumptions and cooling path in the same inquiry.
If back-EMF gap exceeds ±10%, mark it as architecture review required before quote lock.
Attach RoHS/REACH declarations and lot test expectation to avoid late-stage compliance delays.
Minimum continue path when blocked
If inputs or evidence are incomplete, use the smallest executable path: lock conservative assumption band, validate thermal and retention checkpoints, rerun checker, and submit a constrained RFQ.
Need adjacent context before RFQ?