Linear, cylindrical and multi-sided Halbach magnet arrays designed around target field strength, uniformity, geometry, segment count and mechanical retention.
We start with field strength, uniformity, working volume and air-gap definition.
Segment count and magnetization vectors are optimized against field benefit and assembly cost.
Adhesive, machined pocket, banding or housing is designed for large internal magnetic forces.
Field mapping is compared against the agreed target and measurement location.
| Configuration | Geometry | Design objective | Common application |
|---|---|---|---|
| Linear Halbach | Straight segmented array with rotating magnetization vectors | Concentrate field on working face | Maglev, separators, linear motors |
| Cylindrical Halbach | Ring/cylinder with rotating vector sequence | High internal or external field | Motor rotors, analytical instruments |
| Dipole / multipole | Field-shaping around a useful aperture | Uniform field region | Sensors, research equipment |
| 4-sided / box array | Flux concentrated into central region | Compact high-field zone | Measurement / laboratory systems |
Field gain depends on segmentation, magnet grade, air gap, array dimensions and boundary conditions; no single multiplier applies to every geometry.
| Application / Architecture | Typical Configuration | Engineering Focus |
|---|---|---|
| Linear array | Successive segments rotated in magnetization direction | One-sided field, gap control, modular assembly |
| Cylindrical Halbach | Ring / cylindrical segmentation | Center field, segment angle, retention |
| Dipole / two-sided | Yoke-free field region | Uniformity and working volume |
| Four-sided array | Square / rectangular flux concentrator | Field concentration and assembly forces |
| Parameter | Capability / Options | Notes |
|---|---|---|
| Configuration | Linear, cylindrical, dipole, 4-sided | Selected from target field / envelope |
| Magnet material | NdFeB N42–N52 class, SmCo where temperature requires | Grade selection tied to field and thermal margin |
| Segment count | 4 minimum practical; 8–16 common | More segments improve field approximation but increase cost |
| Angular orientation | Project controlled; ±1° class matters | Orientation error directly affects field quality |
| Segment position | ±0.05 mm class typical target | Air gaps and radial position influence performance |
| Validation | Hall-probe scan / field mapping vs target | Measurement geometry defined before build |
Agree target field and measurement plane / volume
Produce magnets to dimensional and magnetization-direction requirements
Bond / retain segments in precision non-magnetic fixture/housing
Hall-probe scan or agreed measurement route
Encapsulation / retention and dimensional final inspection
Measure field strength and uniformity at the defined working plane.
Mark / verify magnetization direction before final bonding.
Maintain controlled gaps because segment spacing changes the field distribution.
Customer can remotely observe field verification and actual displayed values.
| RFQ / DFM input | What to provide |
|---|---|
| Target field | Strength, uniformity, field-free side requirement |
| Geometry | Linear/cylindrical, envelope, working gap / bore |
| Temperature | Continuous / peak temperature |
| Mechanical environment | Vibration, shock, retention / housing constraints |
| Volume | Prototype and annual demand |
Four segments capture the basic Halbach effect; 8–16 is common when field quality matters. The best count depends on field target, size and cost.
No. Strong internal forces tend to rotate/eject segments. A fixture, housing and/or mechanical retention is part of the engineering problem.
For engineering programs we can review the target field and geometry before finalizing segment design and validation method.
No. Field gain is geometry-dependent. We avoid an absolute multiplier and instead validate the actual array against the target measurement geometry.
We can review magnets, mechanical retention, interfaces, magnetization, inspection and supply as one program.
Working-face field, field uniformity, useful volume/line and allowable stray field.
Evaluate geometry, segment count, grade and air gap.
Define magnetization vector and mechanical datums for each segment.
Control high mutual forces and orientation during bonding/retention.
Measure actual field distribution against the agreed locations/scan path.
Document geometry, orientation and field result according to the project plan.
Segment identification, magnetization vector and polarity sequence.
Measured field profile / key points according to the agreed test method.
Array datums, gap/spacing and envelope dimensions.
Assembly or final field-mapping video can be provided for remote customer verification.
