Magnetic levitation — linear Halbach track
Field orientation, track pitch, air gap and force measurement method.
Halbach Arrays — One-Sided Flux, Concentrated Field
The Halbach geometry concentrates magnetic flux on one side while canceling it on the other — a geometry-dependent gain of approximately √2× on the working face where you want it, and near-zero on the back. We design and build complete arrays.
For Procurement
MOQ, lead time, packaging and commercial terms — go straight to a quotation.
Request a Quote →For Engineering
Grades, drawings, process data and design support for your DFM review.
Magnet Design Guide →For Quality / SQE
Certificates, inspection planning, traceability and PPAP / FAI support per project.
Certificates & Documentation →Product Range
Halbach Arrays — Product Gallery
Representative product forms for reference. Final geometry, material and finish are agreed for each project.
Why Halbach?
A single magnet has flux on both faces. Rotate successive magnets by 90° and the flux constructively interferes on one side while destructively canceling on the other.
- ✓Concentrated field strength — one-sided field is approximately √2× stronger than a conventional two-sided array of the same volume, depending on geometry
- ✓Zero flux on the back side — no need for a steel backing plate — lighter and no stray field to interfere with electronics
- ✓Sinusoidal field — linear Halbachs produce a nearly perfect sinusoidal field — ideal for brushless motors and maglev
- ✓Custom geometries — linear, cylindrical (rotating), and 4-sided configurations designed to your spec
Applications
| Application | Typical Spec | Why This Material |
|---|---|---|
| Brushless DC Motors | Cylindrical Halbach rotor | Sinusoidal back-EMF, no cogging, high efficiency |
| Magnetic Levitation | Linear Halbach track | Strong one-sided lift force for maglev systems |
| Particle Accelerators | Hybrid Halbach (NdFeB + SmCo) | Precision field shaping for beam control |
| MRI & NMR | Cylindrical Halbach | Compact, open MRI designs without superconducting magnets |
| Magnetic Refrigeration | Rotating Halbach | Field switching for magnetocaloric cooling |
Halbach Array Configurations
We design the array to your field spec.
| Configuration | Geometry | Field Gain | Typical Use | Notes |
|---|---|---|---|---|
| Linear Halbach | Straight row, 90° rotation | 1.4× vs flat array | Maglev tracks, separators | Simple assembly, modular |
| Cylindrical Halbach | Ring, continuous k=1 rotation | 2× vs uniform ring | Motor rotors, MRI | Highest center field |
| Dipole (2-sided) | Rectangular yoke-free | High uniformity | Accelerators, sensors | Uniform field region |
| 4-Sided Halbach | Square cross-section | Very high center field | Analytical instruments | Compact flux concentrator |
Design Support
We provide complete Halbach design services:
- ✓FEA simulation — we model your array in 2D/3D FEA software and iterate the geometry to hit your field target
- ✓Segment optimization — we balance segment count (more segments = better field but higher cost) against your budget
- ✓Grade selection — NdFeB N42–N52 for maximum field; SmCo for high-temperature; bonded for complex shapes
Assembly Methods
Halbach arrays are challenging to assemble — the field wants to self-destruct the configuration. We have the fixturing to build them right:
- ✓Precision bonding — segments bonded into non-magnetic (aluminum, G10, PEEK) housings with alignment fixtures
- ✓Mechanical retention — for high-vibration applications: machined pockets with adhesive and mechanical interlock
- ✓Segment marking — every segment is marked with its magnetization direction — your team can service the array without a magnetization map
Production & Supply Planning
Halbach Arrays: A Defined Route to Repeat Orders
Agree the process, acceptance criteria and shipment plan before production starts. The quotation identifies the producing site and the controls required for your part.
Confirm the manufacturing route
Confirm the segment layout, magnetic orientation, fixture design and retention method against the required field.
Approve the inspection plan
Define the measurement plane or volume, air gap, field strength and homogeneity or harmonic limits.
Qualify before repeat supply
Define sample approval, drawing revision and lot identification. Agree how material, process or site changes will be reviewed before implementation.
Plan releases and delivery
Confirm order quantities, capacity allocation, packaging and shipping terms against your forecast. Delivery dates and any buffer-stock arrangement belong in the agreed supply plan.
Application Engineering
Where Halbach arrays Fit
Typical component uses and the requirements to discuss before quotation. Suitability depends on your design and validation criteria.
Brushless motors — cylindrical Halbach rotor
Pole pattern, rotor retention, field harmonics and operating speed.
Compact MRI and NMR — open-bore field source
Bore size, useful field volume, homogeneity and shimming strategy.
Particle accelerators — compact beam focusing
Magnetic period, integrated field, alignment and field mapping.
Frequently Asked Questions
How many segments do I need?
More segments create a better approximation of the ideal continuous Halbach. Practical minimum is 4 segments (90° rotation) which captures most of the benefit. 8–16 segments is typical for motor and MRI applications. Beyond 16, assembly cost rises faster than field improvement.
Can a Halbach array hold itself together?
No — the same forces that create the one-sided field try to rotate and eject the segments. Every Halbach needs a housing, adhesive, and/or mechanical retention. We design retention based on your vibration and shock requirements.
Do you offer simulation before manufacturing?
Yes — send your target field strength, geometry envelope, and uniformity requirements. We'll simulate your array, propose a segment design, and provide field plots for your review before cutting any material.
What tolerances matter most in a Halbach?
Segment angular orientation (±1°) and radial position (±0.05mm) dominate field quality. Segment-to-segment gaps also degrade the field — we bond segments with controlled adhesive bondlines to minimize gaps.
Array Assembly & Validation
Segmentation & Bonding
Segments bonded in precision fixtures with structural adhesive; bond lines and gap tolerances controlled to hold the calculated field profile.
Flux Mapping
Hall-probe scanning of the assembled array against FEA prediction — field strength, uniformity and zero-field side verified before shipment.
Encapsulation
Potting or banding for mechanical and environmental protection; arrays can be integrated onto shafts, back-irons or customer structures.
Have an Assembly Drawing or BOM?
Send it to our team — we'll review the design and quote it as a validated, ready-to-install assembly.