EVMotorMagnets logoEV Motor Magnets
Hybrid page: online checker + decision report

Arc magnet online checker for buy-now and custom RFQ decisions

Enter the online listing or RFQ fields you know. The checker returns a catalog, custom RFQ, or engineering-review path with missing fields, risk boundaries, and a quote-ready next action.

Tool first

Result in one run

Evidence dated

June 5, 2026

Single URL

No split intent

Online RFQ readiness inputs
Defaults represent a pilot BLDC rotor inquiry. Boundary errors are recoverable and shown before results.

Boundary: 5-300

Boundary: 1-290

Boundary: 5-180

Boundary: 2-160

Boundary: 1-500000

Boundary: 3-240

Boundary: -40-320

Boundary: 0-60000

Result feedback
Same inputs produce the same deterministic screening result. Empty state remains visible until you run the checker.
Empty state

Readiness score

0/100

Run the checker to classify the online path and expose missing RFQ fields.

Geometry0/60
Evidence0/60
Online fit0/40
Arc segment inputsOD, ID, angle, length, magnetizationIDODcoverage 8.3%

Radial thickness

Pending

Mean diameter

Pending

Arc length

Pending

Tip speed

Pending

Missing or watch fields

  • Run checker to identify missing magnetization, coating, certificate, material, and application fields.
Report summary

Core conclusions for online arc magnet sourcing

The online intent is practical, but trustworthy decisions require a split between catalog availability, custom RFQ readiness, and engineering validation. These conclusions are tied to the source table below.

8 fields
Minimum online RFQ package

OD, ID, arc angle, length, material/grade, coating, magnetization direction, and quantity should be known before price comparison.

3 paths
Online does not always mean catalog

A catalog item is viable for prototypes; motor and generator builds usually need custom RFQ or engineering review.

0 substitutes
No checker replaces validation

Use the result to triage readiness, then verify drawings, magnetic certificate, samples, retention, and thermal behavior.

2026-06-05
Evidence timestamp

SERP and source patterns were checked on June 5, 2026. Supplier stock and prices remain time-sensitive.

Br / HcJ / BHmax
Grade labels need measured properties

Online N-grade or SH-grade claims should map to magnetic property evidence and a named test method before production comparison.

EU-bound
Traceability can be a buying requirement

For products entering regulated supply chains, ask about magnet origin, recycled content, recyclability, and safe removal evidence early.

Best fit
Online catalog pages work for low-risk prototypes when every critical field matches and polarity can be inspected before use.
Mainstream case
Most motor, generator, and replacement projects should use an online custom RFQ with a drawing, certificate request, and sample validation plan.
Not suitable
High heat, high RPM, unknown magnetization, unknown material, or production quantity should not be treated as a simple online cart purchase.
Methodology

How the checker converts online listings into actions

The calculation is intentionally conservative. It does not claim live price or stock accuracy; it scores whether the online data is complete enough to move toward catalog order, custom RFQ, or engineering review.

ListingDrawingCertificateSampleEvidence maturity path
Scoring logic and boundaries
Swipe horizontally to compare the full table.
StepInputsOutputBoundary
Geometry completenessOD, ID, angle, lengthRadial thickness, mean diameter, arc length, coverageDoes not validate tolerance stack or mating rotor drawing.
Material and temperatureNdFeB, ferrite, SmCo, unknown plus max temperatureThermal risk flag against broad family limitsGrade-specific irreversible loss must be checked by supplier data.
Online buying pathCatalog vs custom RFQ vs engineering review, quantity, lead timeCatalog fit and lead-time riskLive stock and final price are not pulled from supplier carts.
Evidence maturityBasic listing, drawing, certificateEvidence score and missing-field listFinal approval requires inspection and application tests.
Data sources and update log
Public evidence supports the page direction and field checklist. Live stock, custom price, and supplier availability remain time-sensitive and must be confirmed in RFQ.

Swipe horizontally to compare the full table.

IDSourceSignalHow usedDateLink
S1Current SERP check for "arc magnet online"Top results include online catalog and supplier pages with OD, ID, length, arc angle, grade, coating, magnetization direction, set count, and custom quote signals.Sets the page angle as online buying/RFQ readiness rather than a generic arc magnet definition.Checked on June 5, 2026Open
S2SuperMagnetMan arc motor magnet catalog examplesPublic product snippets expose catalog dimensions such as OD, ID, length, angle, grade, plating, pole split, and MOQ.Supports catalog-fit checks for prototypes and low-risk online purchases.Checked on June 5, 2026Open
S3Stanford Magnets neodymium arc magnetsSupplier page states that neodymium arc magnets can be customized by size, angle, grade, and magnetic orientation.Supports custom RFQ branching when catalog geometry does not match the application.Checked on June 5, 2026Open
S4K&J Magnetics arc segment product exampleArc segment catalog copy ties online products to ring OD/ID assembly and Br/coating information.Shows why online pages must still be translated into assembly-level fit checks.Checked on June 5, 2026Open
S5ASTM A1101-16 NdFeB magnet specificationPublic standard page covers NdFeB composition, workmanship, finish, sampling, certification, packaging, Br, HcB, HcJ, and BHmax.Turns online quote decisions into evidence requests for grade certificate, finish, sampling, and packaging.Standard page accessed on June 5, 2026Open
S6ASTM A977/A977M permanent magnet test methodASTM positions hysteresigraph testing for high-coercivity permanent magnets and references IEC 60404-5.Supports asking online suppliers to name the magnetic test method instead of relying only on grade labels.Standard page accessed on June 5, 2026Open
S7IEC 60404-5:2015 permanent magnet measurement standardIEC defines measurement of magnetic flux density, magnetic polarization, magnetic field strength, demagnetization curve, and recoil line for permanent magnet materials.Supports asking online suppliers for test method, measured curve data, and sample geometry rather than accepting only a grade label.IEC publication page accessed on June 5, 2026Open
S8USGS Mineral Commodity Summaries 2026: Rare EarthsUSGS reports 2025 rare-earth data, limited recycling from permanent magnets, and 2021-24 U.S. rare-earth compound/metal import sources led by China.Adds supply-risk context for NdFeB and SmCo online quotes, especially when dysprosium, terbium, or samarium exposure matters.USGS 2026 report accessed on June 5, 2026Open
S9USGS Mineral Commodity Summaries 2026: Heavy Rare EarthsUSGS reports 100% U.S. net import reliance for heavy rare-earth compounds and metals, with small quantities recovered from permanent magnets.Explains why high-temperature NdFeB grades that depend on Dy/Tb should be quoted with lead-time and substitution risk, not price alone.USGS 2026 report accessed on June 5, 2026Open
S10European Commission Critical Raw Materials Act pageThe Act sets requirements on recyclability and recycled content for permanent magnets and aims to improve collection and recycling of critical raw material-rich waste.Turns EU-bound RFQs into traceability, recyclability, and recycled-content questions instead of treating online magnets as anonymous parts.European Commission page accessed on June 5, 2026Open
Evidence translation

Convert standards and reports into RFQ fields

The useful information gain is not that a standard exists. It is knowing which supplier claim the standard can challenge, what to ask for, and what still remains unproven after the document arrives.

CatalogStock / sampleRFQDrawing / certSupplyRare earth riskMarketEU evidencePublic page evidence becomes RFQ questions, not final approval.
What each source changes in the inquiry
Swipe horizontally to compare the full table.
EvidenceOnline claim it testsAsk supplier forLimit / uncertainty
ASTM A1101-16 for sintered NdFeBN42, N48SH, N52, or custom NdFeB gradeBr, HcB, HcJ, BHmax, finish/coating, workmanship, sampling, certification, and packaging terms.The public page confirms scope and evidence categories; exact acceptance values belong in the purchased standard and supplier certificate.
ASTM A977/A977M or IEC 60404-5Magnetic certificate availableNamed test method, sample shape, test temperature, demagnetization curve, recoil line, and measured Br/HcJ/BHmax.A certificate from a batch sample does not prove final assembled rotor performance.
USGS 2026 rare-earth dataFast lead time for high-temperature rare-earth magnetsQuote validity, raw material allocation, grade substitution path, and heavy rare-earth exposure when Dy/Tb is used.USGS gives macro supply context, not a live supplier inventory check.
EU Critical Raw Materials Act directionEU-ready or green magnet supplyOrigin, weight, chemical composition, recyclability, recycled-content statement, and safe-removal information when applicable.Product-specific obligations depend on final product category and implementation timing; confirm with compliance counsel or customer requirements.
Buying path comparison

Catalog order, online RFQ, or engineering review

Do not compare suppliers until the buying path is clear. A cheap catalog listing, a custom quote, and an engineering review solve different problems.

PathBest forStrengthsRisksAction
Catalog online orderBench fixtures, prototypes, educational buildsFast, visible dimensions, small MOQLimited grade, magnetization, tolerance, and traceability controlBuy only after exact OD/ID/angle/length and pole orientation match.
Online custom RFQPilot motors, replacement programs, low-to-mid volume buildsDrawing control, grade options, coating and magnetization choicesQuote variance, sampling delay, incomplete supplier evidenceSend drawing, certificate requirements, destination, and test plan.
Engineering review firstHigh RPM, high heat, safety-critical or undocumented programsReduces late redesign, demag, and retention failure riskLonger front-end cycle and more validation costFreeze assumptions, run magnetic/thermal/mechanical validation, then RFQ.
Risk controls

Where online arc magnet decisions fail

The most common failure is not that an online supplier exists. It is that the buyer treats visible dimensions as a complete engineering specification.

Known versus unknown before a purchase order
This boundary prevents public online evidence from being over-read as production approval.
DecisionMore reliable online dataStill missing or time-sensitiveBuyer move
Prototype catalog orderListing dimensions, coating, grade, visible stock, return termsBatch traceability, long-term repeatability, validated demag marginBuy samples only; inspect dimensions, polarity, coating, and breakaway/fit before scaling.
Pilot or production RFQDrawing, quote, certificate sample, supplier process routeFinal process capability, yield, logistics delay, customer validationAdd PPAP-style evidence if automotive, define AQL/inspection, and keep price validity dates explicit.
High-temperature rare-earth designGrade family, max operating temperature target, test methodDy/Tb allocation, irreversible loss curve, alternate grade performanceRequest thermal demag evidence and a substitute-grade plan before committing tooling.
EU-regulated product pathSupplier declarations, origin statement, material compositionFinal recyclability/recycled-content proof and product-category obligationsTreat traceability fields as RFQ inputs, not post-order paperwork.
RiskTriggerImpactMitigation
Geometry mismatchOnline listing gives OD/ID but no mating drawing tolerance.Air-gap, adhesive thickness, or segment coverage fails at assembly.Ask for drawing with tolerance, chord/arc definition, and segment count.
Magnetization ambiguityListing says arc magnet but not through-thickness, radial, or circumferential direction.Motor torque and sensor behavior can be wrong even if dimensions fit.Require a magnetization diagram before payment or sample approval.
Grade label overconfidenceSupplier lists N52/N48SH without Br, HcJ, BHmax, or test method evidence.Thermal margin and demag resistance may be lower than expected.Ask for certificate, sample test plan, and operating-temperature statement.
Stock-price illusionSmall catalog item appears cheap and available online.Pilot or production quantity may require tooling, longer lead time, or different MOQ.Separate prototype order from production RFQ and confirm repeatability.
Compliance gapDestination, RoHS/REACH, packaging, or import evidence is not specified.Shipment delay, rejected parts, or recertification work.Name destination market and required declarations in the first RFQ.
Rare-earth supply exposureHigh-temperature NdFeB or SmCo quote depends on heavy rare earths, but the supplier gives no origin, allocation, or substitute-grade plan.Lead time, repeatability, or price can change after the online quote stage.Ask for grade alternatives, Dy/Tb or Sm exposure where relevant, validity period, and allocation assumptions.
Test-method mismatchCertificate lists Br, HcJ, or BHmax without sample geometry, temperature, or test method.Two suppliers may appear equivalent online while using non-comparable evidence.Require ASTM A977/A977M, IEC 60404-5, or another named method and state acceptance values on the drawing.
Scenario examples

Three example outcomes from the same online intent

Prototype catalog match
20 mm OD, 15 mm ID, 90 deg arc, 2 sets, room temperature
Catalog candidate

Order small quantity, inspect polarity, then decide whether a custom drawing is needed.

Pilot BLDC rotor
92 mm OD, 78 mm ID, 30 deg arc, 600 sets, 135 C, unknown magnetization
Custom RFQ

Add magnetization diagram and retention assumptions before quote release.

High-speed hot rotor
120 mm OD, 105 mm ID, 18 deg arc, 12000 RPM, 185 C, unknown material
Engineering review

Resolve material, grade, thermal margin, retention, and supplier evidence before online RFQ.

FAQ

Arc magnet online questions by decision type

Send a quote-ready online arc magnet inquiry
Include checker outputs, supplier listing link if available, drawing fields, magnetization direction, material, coating, quantity, lead time, and destination requirements.

Evidence last updated: June 5, 2026. Public online evidence is enough for screening, not final approval.

Inquiry Email

[email protected]

Open email appStart inquiry (opens email app)