Product overview
The Ultra-Thin NdFeB Block Magnet for Motor is a purpose-built rare-earth block intended where axial space is limited but magnetic performance cannot be compromised. Unlike standard blocks, the ultra-thin profile lets you place magnetic material directly into tight slots or between thin laminations, reducing rotor/stator diameter or enabling lower overall package height.
This product is used by motor designers and OEMs who need repeatable magnetic properties, predictable thermal behaviour, and the option to scale from prototype runs to volume production.
Technical highlights
- Material / grade: Sintered Nd–Fe–B. Standard grades available from N35 to N52; high-temperature grades supplied on request.
- Form factor: Ultra-thin rectangular block - custom length and width with thickness options down to sub-millimetre where manufacturing permits.
- Magnetization: Normally axial through thickness; alternate magnetization directions and multi-pole patterns available for specific rotor/stator designs.
- Coating: Ni-Cu-Ni standard. Epoxy or zinc coatings offered where corrosion or handling risk exists.
- Tolerance & testing: Typical dimensional tolerance ±0.05 mm; tighter tolerances negotiated per project. Each batch includes magnetic flux verification and dimensional inspection reports.
- Thermal note: Thin NdFeB blocks have the same grade-dependent temperature limits as standard blocks; specify operating temperature so we can recommend suitable grades or treatments.
Why this form is used in motors
Thin blocks allow you to place magnetic material closer to the air gap without adding radial mass. The result is a motor that can meet torque or cogging targets while keeping a compact envelope. Using pre-matched blocks simplifies assembly versus machining thin features from larger magnets or from bonded material.
Practical integration points
- Design mounting features or adhesive channels rather than relying on press fits; thin blocks are brittle and need mechanical support.
- Account for coating thickness in tight fits; specify final assembled gap so we can hold tolerances accordingly.
- For high-speed rotors, request dynamic balancing recommendations - we can supply matched sets sorted by mass and flux.
Supply, sampling and procurement
We support sample quantities for validation and will scale to bulk orders with consistent batch documentation. Typical workflow: provide required dimensions, magnetization pattern and expected operating temperature → receive sample batch for fit and magnetic testing → confirm tooling and lead time → move to production with batch traceability.
Packaging & quality control
Blocks are packed with separators and cushioning to avoid chipping or magnetic clumping. Shipments include inspection reports (flux, dimensions, coating). For OEM contracts we can provide long-term supply agreements, labeled trays for assembly lines, and JIT delivery terms.
FAQ
Q: Can you produce sub-millimetre thickness?
A: In some geometries yes - send drawings; we'll assess feasibility and tolerances.
Q: How do coatings affect fit?
A: Coatings add microns; we incorporate this into final tolerance control and note it on drawings.
Q: Are matched sets available?
A: Yes - we can deliver matched blocks sorted by flux and mass for rotor assembly.
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