Product Overview
Laminated NdFeB Magnets
Laminated NdFeB magnets are high-performance neodymium magnet assemblies made by bonding multiple thin magnet slices together with electrically insulating layers. Compared with a solid magnet of the same overall size, a laminated magnet can significantly reduce eddy current loss in high-speed, high-frequency and rapidly changing magnetic field applications.
A typical laminated NdFeB magnet includes precision-cut magnet sheets, insulation coating or adhesive layer, controlled lamination direction, final machining when required, protective surface coating and magnetic inspection. The lamination structure helps reduce heat generation, improve motor efficiency and protect magnets from temperature-related demagnetization in demanding electric machine designs.
Ningbo Vanguard Technologies supplies custom laminated NdFeB magnets in block, arc, segment, rectangular, ring-sector and special-shaped designs. We support magnet grade selection, lamination thickness recommendation, insulation material selection, bonding process control, coating, magnetic testing, dimensional inspection and batch production.
Whether you need laminated magnets for EV traction motors, high-speed rotors, servo motors, generators or aerospace drives, Vanguard can provide sample production within 10-20 days after drawing and specification confirmation.
Quick View
Laminated NdFeB Magnet Selection Snapshot
Low Loss
Eddy Current Reduction
Thin insulated magnet slices reduce eddy current heating in high-frequency motor fields.
Thin Slice
Lamination Thickness
Slice thickness and lamination direction are selected by frequency, loss target and geometry.
Insulated
Bonding Layer Control
Insulating adhesive layers help reduce current paths while maintaining assembly strength.
10-20 Days
Prototype Lead Time
Fast sampling after grade, slice thickness, coating and drawing are confirmed.
Lamination Design Focus
Dimensional Control
Grinding
Coating Protection
Surface
1Loss ReviewSpeed, frequency, heat
2Grade MatchBr, Hcj, temperature
3Slice PlanThickness, direction, stack
4BondingInsulation, adhesive, curing
5InspectionSize, flux, insulation
Key Applications
EV Traction Motors
Laminated NdFeB magnets reduce eddy current heating in high-power electric vehicle traction motors and hybrid powertrains.
High-Speed Rotors
Used in high-speed motors, compressors, turbines and spindle drives where magnet temperature rise must be controlled.
Servo Motors
Precision laminated magnets support low-loss, low-heat and high-response servo motors for automation and robotics.
Wind Generators
Segmented laminated magnets can improve thermal stability in direct-drive generators and high-efficiency alternators.
Aerospace Drives
High-temperature laminated NdFeB magnets are suitable for lightweight motors, actuators and special aerospace systems.
Motor R&D
Custom laminated samples for loss comparison, thermal validation, prototype rotors and electromagnetic design testing.
Typical Lamination Specifications
The following options are commonly used for custom laminated NdFeB magnets. Final specifications are confirmed according to motor design, operating frequency, speed, temperature, coating and assembly requirements.
|
Item |
Available Options |
Engineering Notes |
|
Magnet Shape |
Block, arc segment, rectangular, tile, ring sector, custom profile |
Shape is customized according to rotor slot, surface-mounted design or magnetic circuit requirement. |
|
Magnet Grade |
N35-N52, M/H/SH/UH/EH series |
Grade is selected according to working temperature, demagnetization margin and target magnetic output. |
|
Slice Thickness |
Commonly 0.5-3.0 mm or custom |
Thinner slices reduce eddy current loss but increase processing complexity and cost. |
|
Lamination Direction |
Thickness direction, width direction, radial direction, custom direction |
Direction should be designed according to eddy current path and changing magnetic field direction. |
|
Insulation Layer |
Epoxy adhesive, insulating coating, high-temperature adhesive film |
Insulation quality affects eddy current reduction, bonding strength and thermal durability. |
|
Surface Coating |
NiCuNi, epoxy, Zn, phosphate, parylene, custom coating |
Coating is selected according to corrosion, temperature, handling and rotor assembly conditions. |
|
Inspection |
Dimension, magnetic property, insulation resistance, coating, bonding, appearance |
Inspection records can be provided for prototype validation and mass-production control. |
NdFeB Grade & Temperature Selection
|
Grade Series |
Typical Grade Range |
Temperature Capability |
Best Used For |
|
Standard N Series |
N35-N52 |
Approx. 80 °C |
General low-temperature motors and prototypes requiring high magnetic strength. |
|
M / H Series |
N35M-N50M, N35H-N48H |
Approx. 100-120 °C |
Servo motors, BLDC motors and medium-temperature rotor applications. |
|
SH / UH Series |
N35SH-N45SH, N35UH-N42UH |
Approx. 150-180 °C |
High-speed motors, EV traction motors and high-load rotor assemblies. |
|
EH / AH Series |
N33EH-N40EH, custom high-temp grades |
Approx. 200 °C or higher by design |
Demanding thermal environments requiring strong demagnetization resistance. |
Selection note: Laminated NdFeB magnet design should be confirmed together with operating speed, electrical frequency, magnet temperature, rotor structure, demagnetization margin and lamination direction. Vanguard can recommend grade, slice thickness and insulation structure after reviewing your motor design.
Available Lamination Configurations
Laminated Block Magnet
Stacked rectangular magnets for linear motors, servo motors, magnetic assemblies and custom low-loss designs.
Laminated Arc Magnet
Segmented arc magnets for rotor assemblies, traction motors, high-speed motors and generator applications.
Radial Lamination
Lamination direction can be designed to reduce eddy current paths in arc or ring-sector magnet structures.
High-Temperature Lamination
High-temperature grades and adhesives can be selected for demanding thermal environments.
Finished Rotor Magnet Set
Magnets can be supplied by matched set with polarity marking, coating and inspection report for rotor assembly.
Prototype Lamination Kit
Small-batch laminated samples for electromagnetic loss comparison, thermal testing and motor validation.
Design Points for Laminated NdFeB Magnets
Laminated NdFeB magnets must balance magnetic performance, eddy current reduction, bonding strength, insulation quality and dimensional accuracy. During design review, Vanguard focuses on magnet grade, slice thickness, lamination direction, insulation layer, coating, operating temperature, rotor speed and assembly method.
For high-speed and high-frequency motors, lamination direction is critical. The insulation layers should interrupt the main eddy current path while maintaining enough mechanical strength for handling, coating and rotor assembly.
Eddy Current Reduction
Slice thickness and lamination direction are designed to reduce magnet heating under changing magnetic fields.
Insulation Quality
Adhesive and coating layers must provide electrical insulation while maintaining bonding strength.
Thermal Stability
Magnet grade, adhesive and coating are selected according to continuous and peak working temperatures.
Assembly Accuracy
Stack alignment, final dimensions, polarity and coating quality are controlled for stable rotor assembly.
Manufacturing & Quality Assurance
Our laminated NdFeB magnet process includes raw magnet inspection, precision slicing, surface treatment, insulation layer application, lamination bonding, curing, final machining when required, coating, magnetization, dimensional inspection, insulation check, magnetic testing and final packaging.
|
Process Step |
Control Target |
Typical Inspection Method |
|
Magnet Inspection |
Grade, magnetic properties, size and material consistency |
Flux meter, hysteresisgraph data, caliper, visual inspection and batch record check. |
|
Slicing & Preparation |
Slice thickness, flatness, surface cleanliness and edge quality |
Micrometer, height gauge, visual check and drawing-based dimensional inspection. |
|
Lamination Bonding |
Insulation layer, adhesive coverage, stack alignment and curing control |
Process fixture, visual check, insulation check and sample bonding validation. |
|
Coating & Magnetization |
Coating thickness, corrosion protection, polarity direction and magnetic output |
Coating test, salt spray when required, polarity checker and surface Gauss test. |
|
Final Inspection |
Dimension, appearance, insulation resistance, pull force or flux consistency |
Caliper, micrometer, insulation tester, Gauss meter and final packing checklist. |
Available Custom Features
Custom Shape
Block, arc, segment, rectangular, tile, ring-sector and special-shaped laminated magnets can be customized.
Custom Slice Thickness
Slice thickness and layer count can be adjusted according to eddy current loss target and cost requirement.
Insulation Layer
Epoxy adhesive, insulating coating and high-temperature bonding systems can be selected by application.
Surface Coating
Nickel, epoxy, zinc, phosphate, parylene and custom protective coatings are available.
Polarity Marking
N/S marking, arrow marking, color marking and matched-set packaging can be provided.
Inspection Report
Dimensional report, magnetic report, insulation report, coating report and batch traceability documents are available.
Information Needed for Fast Quotation
To quote laminated NdFeB magnets quickly, please provide magnet drawing, overall dimensions, magnet grade, lamination direction, slice thickness, layer count, coating, magnetization direction, working temperature, motor speed or frequency if available, annual quantity and testing standard.
If the design is still under development, you may share the motor type, operating speed, electrical frequency, target temperature rise, available magnet space and whether the magnet will be used in a surface-mounted or embedded rotor. Our engineering team can help recommend a practical lamination structure.
Frequently Asked Questions
What is the advantage of laminated NdFeB magnets?
They reduce eddy current loss and magnet heating in high-speed or high-frequency motors, helping improve efficiency and thermal stability.
Can you customize lamination direction?
Yes. Lamination direction can be designed according to the main eddy current path, magnet shape and motor magnetic field variation.
Which NdFeB grades are available?
Common options include N, M, H, SH, UH and EH series grades. Grade selection depends on working temperature, demagnetization risk and required magnetic output.
Can laminated magnets be coated after bonding?
Yes. Depending on design, laminated magnets can be coated with nickel, epoxy, zinc, parylene or other protective coatings after bonding and finishing.
Can you provide insulation test data?
Yes. Insulation resistance, dimensional inspection, magnetic data, coating report and batch traceability can be provided according to project requirements.
What is the lead time for custom laminated NdFeB magnets?
Prototype lead time is usually 10-20 working days after drawing confirmation. Mass-production lead time is typically 25-45 working days depending on size, grade, lamination structure, coating and testing requirements.
