Methodology · Reading guide
NdFeB permanent magnets – data, models and sources
This guide explains the evidence classes and system boundaries used across the research pages, allowing the Top 10 overview and application data to be compared on a consistent basis.
15 Data rows
Sources reviewed as at 30/08/2026. Time-sensitive product, market and legal information should be checked directly against the source before a specific decision is made.
| Field | Explanation |
|---|---|
| As at | 30/08/2026; the research date and source review do not guarantee that the information is still current. |
| Purpose | Source-based data for public information about NdFeB permanent magnets in technical applications. |
| Key rule | Model-specific manufacturer and teardown values are kept strictly separate from literature factors. A literature factor is not a model-specific bill of materials (BOM). |
| Quantity evidence categories | measured · manufacturer-stated · calculated · estimated/literature value · not published |
| A-M | Model- or component-specific measured or teardown value. |
| A-H | Model- or component-specific manufacturer figure. |
| B-C | The model topology is documented; the quantity is transparently calculated from a literature factor. |
| C-R | Teardown or market value reported only in a reliable secondary source. |
| D-G | Generic literature value or technology type only; do not interpret as a model-specific value. |
| X | Contradictory evidence, an unclear system boundary or an insufficiently verified claim. |
| Nd/Dy/Tb | Use only direct manufacturer figures or technology-specific kg/MW factors. Do not derive values from oxide samples or grade suffixes without a material balance. |
| 0-Arch | A value of 0 kg of NdFeB in the traction motor follows from a clearly magnet-free motor architecture (e.g. ASM/EESM) and applies only to the specified generation or variant. |
| Source links | Full URLs are displayed so that each statement can be checked against its individual source. |
| Update notice | Before making a specific decision, check each model entry against current manufacturer documentation, as product generations change. |
| Data status | The dataset reflects the sources reviewed as at 30/08/2026; time-sensitive information may have changed since then. |