Case study
EV Motor Rotor Magnets with Tight Tolerance Control
Reducing scrap and lead time for EV motor rotor assemblies using N42SH NdFeB magnets.
Key results
- Scrap rate reduced from 4.8% to 1.6%
- Lead time stabilized to 3-4 weeks
- Supplier QC checkpoints added for axial magnetization
Problem
The buyer needed N42SH rotor magnets with tight dimensional tolerance and stable magnetization direction. Previous suppliers delivered inconsistent tolerances, causing scrap in rotor balancing.
Solution
We coordinated a Ganzhou supplier with experience in high-temperature NdFeB grades and introduced two additional QC checkpoints: magnetization direction verification and final dimensional sampling with CMM.
Specifications
- Material: NdFeB (N42SH)
- Shape: Rectangular bar
- Tolerance: +/-0.03 mm critical dimensions
- Coating: NiCuNi
- Magnetization: Axial
- Volume: 20k pcs/month
Results
- Scrap rate reduced from 4.8% to 1.6%.
- Lead time stabilized to 3-4 weeks.
- RFQ response time improved to under 24 hours.
Next Steps
Share your rotor drawings and operating temperature requirements to confirm grade and tolerance feasibility.
Request a supplier quote
Share your drawings, grade targets, and quantities. We will coordinate supplier feedback and confirm specs.
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