Max Length 200mm, Industrial Separation & Motor Grade
We manufacture Large Neodymium Blocks for heavy industry applications.
These are not off-the-shelf components; they are massive slabs of sintered magnetic energy blocks.
Commonly used for use in over-belt separators, linear motor tracks, and MRI equipment.
We can cut and grind these blocks to your exact dimensional requirements.
No matter you need a long, flat “plate” for a sputtering target or a thick “brick” for a magnetic chuck.
Such block magnets can generate holding forces exceeding 200kg per piece.
The Engineering Logic: Size vs. Physics
Building big magnets requires managing the physical limits of the material.
1. The “60mm Saturation” Rule (Thickness Limit):
The Constraint:
Just like our large rings and cubes, we recommend a maximum thickness of 60mm for any single block.
The Reason:
If a block is thicker than 60mm, the magnetizing pulse cannot fully penetrate the core, leaving the center weak.
The Solution:
If you need a 100mm thick block, we will manufacture two 50mm blocks and bond/laminate them together.
This ensures the magnet is fully saturated and powerful all the way through.
2. Orientation Matters (The 3 Axes):
The Confusion:
On a block sized 100mm x 50mm x 20mm, the magnetic pull is completely different depending on which way the poles point.
We can customize the Magnetization Direction to suit your machinery:
– Through Thickness: (Standard for holding/clamping).
– Through Length: (Rare, but used for specific sensor or Hallbach setups).
– Lateral: (Through width).
Critical Safety & Handling
A large Neodymium block is a “loaded spring” of potential energy.
1. The “Slap” Hazard:
The Risk:
Large blocks are difficult to handle because they want to flip and slam onto steel surfaces flat-faced.
This can shatter the magnet and crush fingers.
Our Packing:
We ship these separated by thick wooden boards.
Your Assembly:
We strongly advise designing a “Slide-in” assembly method.
Do not try to place a large block directly onto a steel plate vertically; it must be slid on from the edge to control the force.
2. Surface Flatness:
The Issue:
Large sintered blocks can warp slightly during firing.
Our QC:
We apply Double-Disc Grinding to large faces to ensure they are perfectly flat.
This prevents the magnet from rocking when mounted.
And ensures 100% surface contact for maximum heat dissipation in motors.
Ideal Applications
Magnetic Separators: Large slabs suspended over conveyor belts to pull scrap metal from food or mining lines.
Linear Motors: Track magnets for high-speed maglev transport or automation.
MRI / NMR: Main field generation blocks for medical imaging.
Sputtering Targets: Large planar magnets used in vacuum coating deposition.
Ordering Guide: Defining the “Brick”
To prevent expensive manufacturing errors, please specify:
1). Dimensions: Length x Width x Thickness.
2). Magnetization Direction: “Which dimension is the magnetic axis?” (e.g., “Through the 20mm thickness”).
3). Application: “Is this for a motor or a separator?”
– If Motor: We might suggest High-Temp (SH) grade.
– If Separator: We might suggest N42 or N52 for max reach.
4). Coating: “Will this be exposed to moisture?” (Epoxy recommended).
Packing Method
It is important to guarantee safe transit for big NdFeB magnets.
And comply with international IATA and IMDG regulations.
We follow a 3-stage shielding method for all large neodymium shipments.
1). First, we put the magnets in dense foam to create a protective air gap.
2). Then, line the shipping cartons with steel plates to securely contain the intense magnetic flux.
- When shipping multiple pieces, we will alternate pole alignments.
- Neutralize stray magnetic fields.
- Insert sturdy spacers between the magnets.
This way, we can ensure safe, pinch-free separation upon unpacking.
3). Finally, every package will undergo stringent field-strength testing before sending to shippers.
Follow these 3 essential steps, we can guarantee such big strong magnets pass airline safety standards.
And assure a secure and hassle-free delivery to you.
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