01 · Overview
About Block Magnets
Rectangular NdFeB blocks are used in linear motors, generator rotors and magnetic arrays. Length, width and thickness are specified with the material orientation and magnetization. Large assemblies may use several blocks; the joints, retention and field distribution need their own design review.
02 · Drawing review
Drawing review and documented scope
- Length, width and thickness reviewed for the selected grade and process
- Easy-axis orientation and magnetization specified on the drawing
- Single-piece and assembled designs assessed separately
03 · Typical Use Cases
Where Block magnets go to work
Linear motor primary magnets
Wind turbine generator rotor blocks
Magnetic separators for mining and recycling
Halbach array assemblies
Permanent-magnet MRI main-field blocks
Magnetic levitation demonstration assemblies
04 · Dimensions & Tolerances
Drawing dimensions and tolerances
| Parameter | Specification |
|---|---|
| Typical dimensions | Length, width and thickness specified on the drawing |
| Tolerances | Critical faces, squareness and coating allowance agreed per drawing |
Tighter spec?
Send your drawing with the critical surfaces called out. We will confirm the dimensions, production route and inspection requirements for your part.
05 · Grade references
Grade references for Block
N42
80°C classN42 reference: 40–43 MGOe at 20°C, with a nominal 80°C temperature class.
Reference; drawing review required
N45
80°C classN45 reference: 43–46 MGOe at 20°C, with a nominal 80°C temperature class.
Reference; drawing review required
N42H
120°C classN42H reference: 40–43 MGOe at 20°C, with a nominal 120°C temperature class.
Reference; drawing review required
N45H
120°C classN45H reference: 43–46 MGOe at 20°C, with a nominal 120°C temperature class.
Reference; drawing review required
N42SH
150°C classN42SH reference: 40–43 MGOe at 20°C, with a nominal 150°C temperature class.
Reference; drawing review required
N45SH
150°C classN45SH reference: 43–46 MGOe at 20°C, with a nominal 150°C temperature class.
Reference; drawing review required
N42UH
180°C classN42UH reference: 40–43 MGOe at 20°C, with a nominal 180°C temperature class.
Reference; drawing review required
06 · Related Applications
Related Applications
Frequently Asked Questions
What is the largest NdFeB block Mainrich can quote?
+
Send the full dimensions, grade, orientation and required quantity. The single-piece limit depends on the selected production route. A bonded stack is a separate assembly and needs a retention and field review.
What grade is best for wind generator block magnets?
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Select from material curves at the generator’s working temperatures and opposing fields. Qualify the coating and encapsulation separately for the actual environment. An SH or UH designation does not establish corrosion resistance or generator life.
Next step
Request a Quote for Block Magnets
Share dimensions, quantity, grade target and operating conditions. We respond within 1 business day. The production route and acceptance requirements are confirmed during drawing review.