For Logistics
Packing, destination and delivery terms — discuss the shipment requirements for your order.
Coordinate deliveryMagnetic Couplings — Torque Across a Containment Barrier
Inner and outer magnet rings transmit torque across a containment barrier without a rotating shaft seal at that barrier. Containment integrity, static joints and contamination control require project-specific validation for pumps and mixers handling hazardous, ultra-pure or sterile fluids.
For Procurement
MOQ, lead time, packaging and commercial terms — go straight to a quotation.
Request a QuoteFor Engineering
Grades, drawings, process data and design support for your DFM review.
Magnet Design GuideFor Quality / SQE
Certificates, inspection planning, traceability and PPAP / FAI support per project.
Certificates & DocumentationProduct Range
Magnetic Couplings — Product Gallery
Product forms, uses and selection considerations. Final specifications are agreed for each project.
Separated Coupling Elements
Rotating members and isolation barrier reviewed together.
Enclosed Coupling Assembly
Mounting, containment and fluid requirements defined together.
Magnet Arrangement
Magnet arrangement and clearance inform torque review.
Three-Part Coupling
A complete inner-member, outer-member and barrier system.
Review the barrier as part of the torque path.
Inner and outer magnetic members transmit torque across a containment barrier. Available gap, alignment and barrier material affect the coupling design and thermal review.
A sealless drive removes the rotating shaft-seal path; it does not certify system-wide zero leakage. Specify pressure, medium, static joints and leak-test acceptance separately.
Review coupling design parametersSELECTION GUIDEApplication selection notesExplore applications and requirements
Why Magnetic Couplings?
Every shaft seal is a leak path — a maintenance item and a contamination risk. A containment-can magnetic drive removes the rotating shaft seal at the barrier. Static seals and other system interfaces still require integrity review.
- ✓Sealless torque transfer — removes the rotating shaft-seal leakage path; containment walls, static joints and the complete system require specified leak testing
- ✓No rotating seal wear at the barrier — magnetic members are non-contact; bearings and other system wear items still require maintenance
- ✓Overload protection — synchronous couplings can lose synchronism above their torque limit; define overload detection and shutdown to control heating and restart
- ✓Custom torque curves — magnet grade and geometry are selected for the required torque envelope, with pull-out torque and tolerances verified under agreed conditions
Applications
| Application | Typical Spec | Why This Material |
|---|---|---|
| Chemical Process Pumps | SmCo in Hastelloy can | Pumping acids, solvents, and toxics |
| Pharma Mixers | SmCo in 316L stainless can | Sterile-process use requires hygienic design and validation |
| Semiconductor Fluid Handling | SmCo in PEEK can | Media compatibility and extractables require validation |
| Refrigeration Compressors | NdFeB in thin steel can | Hermetic compressor drive |
| Laboratory Reactors | SmCo in glass-lined can | Sealed reaction vessels |
Coupling Design Parameters
Provide rated and peak torque, speed, fluid, pressure and temperature. The published ranges below are design references, not a tested catalogue rating; confirm the complete operating envelope for the selected assembly.
| Parameter | Typical Range | Notes |
|---|---|---|
| Torque | 0.1–500 Nm | Custom designs; sintered NdFeB or SmCo |
| Speed | Up to 10,000 RPM | Higher with special balancing |
| Temperature | -40°C to 350°C | Select grade, retention and barrier for the full thermal duty |
| Containment can | 316L, Hastelloy C, PEEK, glass | Material matched to fluid |
| Gap | 1–5mm typical | Smaller gap = more torque per volume |
| Decoupling torque | 1.3–2× rated torque | Protects against overload |
Synchronous vs Eddy-Current
Two coupling technologies for different requirements:
- ✓Synchronous (permanent magnet) — inner and outer rings lock magnetically and turn together — full torque up to the decoupling point; standard choice
- ✓Eddy-current (induction) — conducting cup (copper or aluminum) on one side generates torque via induced currents — provides soft-start and slip protection but at lower efficiency (90–95%)
Containment Can Selection
The containment can must satisfy pressure, chemical, thermal and magnetic requirements together:
- ✓Metal cans (316L, Hastelloy) — pressure-resistant and chemically compatible, but eddy-current losses at high speed — use for moderate RPM or high pressure
- ✓Non-metallic cans (PEEK, ceramic) — electrically insulating materials avoid conductive-can eddy-current loss; chemical, pressure and temperature limits depend on the selected material and geometry
- ✓Can thickness — thinner = more torque but less pressure margin; we optimize thickness for your pressure and torque spec
Define the Torque-Coupling Duty
Size a torque coupling with torque, speed and containment requirements—not a magnetic-wheel pull-force value.
Operating duty
- Rated, peak and disengagement torque in N·m
- Continuous and maximum speed in rpm, duty cycle and service life
- Continuous and peak temperature, fluid and pressure
Interfaces & verification
- Shaft sizes, mounting envelope, air gap and allowable misalignment
- Containment-can material and wall thickness
- Torque-versus-angle curve, temperature rise and containment test requirements
Separate reference: EM-W / EM-R magnetic wheels
Source: archived TY Magnets dimensional references. The drawings illustrate the retained source notation; they do not establish Empire supply approval or pull-force test results.
Dimensions are in mm, except thread designations such as M4. Pull force is in N and weight in kg. These magnetic-wheel references are separate from torque-coupling selection; N is not torque in N·m. The archived supplier table uses TY-W/TY-R identifiers; the historical EM-W/EM-R references below require an approved part-number mapping, drawing revision and pull-test conditions before selection.
Discuss a custom magnetic assembly
| Part Number | D (mm) | d (mm) | W (mm) | b (mm) | h (mm) | Pull Force | Weight |
|---|---|---|---|---|---|---|---|
| EM-W-25 | 25 | 8 | 16 | 3 | 8.6 | 55 N | 0.054 kg |
| EM-W-32 | 32 | 10 | 18 | 4 | 11.1 | 80 N | 0.100 kg |
| EM-W-40 | 40 | 12 | 20 | 4 | 13.1 | 120 N | 0.200 kg |
| EM-W-50 | 50 | 16 | 25 | 5 | 17.3 | 200 N | 0.350 kg |
| EM-W-63 | 63 | 20 | 32 | 6 | 21.7 | 330 N | 0.700 kg |
| EM-W-80 | 80 | 25 | 40 | 8 | 26.7 | 630 N | 1.450 kg |
| EM-W-100 | 100 | 30 | 50 | 8 | 31.7 | 900 N | 2.800 kg |
| EM-W-125 | 125 | 40 | 62 | 12 | 42.1 | 1520 N | 5.350 kg |
| Part Number | R (mm) | L (mm) | W (mm) | H (mm) | W1 (mm) | H1 (mm) | R1 (mm) | M | W2 (mm) | L1 (mm) | Pull (0mm) | Pull (3mm) | Pull (5mm) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| EM-R-5040 | 50 | 40 | 76 | 36.5 | 42 | 12.5 | 26 | M4 | 64 | 18 | 490 N | 230 N | 150 N |
| EM-R-5060 | 50 | 60 | 76 | 36.5 | 42 | 12.5 | 26 | M4 | 64 | 38 | 820 N | 400 N | 260 N |
| EM-R-8040 | 80 | 40 | 115 | 51 | 76 | 20 | 49 | M5 | 102 | 18 | 730 N | 400 N | 300 N |
| EM-R-8060 | 80 | 60 | 115 | 51 | 76 | 20 | 49 | M5 | 102 | 38 | 1250 N | 730 N | 540 N |
| EM-R-10040 | 100 | 40 | 152 | 62 | 100 | 26 | 64 | M5 | 138 | 18 | 850 N | 480 N | 340 N |
| EM-R-10060 | 100 | 60 | 152 | 62 | 100 | 26 | 64 | M5 | 138 | 38 | 1500 N | 900 N | 650 N |
| EM-R-12040 | 120 | 40 | 172 | 70 | 120 | 30 | 80 | M5 | 158 | 18 | 1000 N | 600 N | 420 N |
| EM-R-12060 | 120 | 60 | 172 | 70 | 120 | 30 | 80 | M5 | 158 | 38 | 1750 N | 1100 N | 800 N |
| EM-R-15040 | 150 | 40 | 200 | 77 | 142 | 31 | 104 | M6 | 186 | 18 | 1200 N | 750 N | 560 N |
| EM-R-15060 | 150 | 60 | 200 | 77 | 142 | 31 | 104 | M6 | 186 | 38 | 2100 N | 1350 N | 1050 N |
Process reference images are separated from the product gallery. They illustrate equipment and handling topics; they do not establish ownership of a facility, a customer delivery, or project-specific inspection results.
Factory Tour
Inside Magnetic Couplings Manufacturing
Magnetic couplings require matched inner and outer subassemblies, controlled magnet integration, torque testing and non-destructive inspection.
3 process viewsProduct-specific manufacturing
2 inspection viewsRelevant quality equipment
1 packing viewProduct-appropriate protection
End-to-end process visibilityManufacturing · inspection · packing documented in one focused route
Manufacturing processInspection & testingPacking & dispatch
Matched Magnetic Subassemblies
Ring-shaped metal components are staged in trays. This reference image does not show magnet polarity or a matched inner / outer magnetic set.
Precision Manual Assembly
Torque-controlled tools support small-coupling assembly and alignment.
System Alignment Setup
Drive and driven sections are aligned for assembly-level evaluation.
Transmitted Torque Test
Instrumented benches measure torque transfer and rotational response.
Coupling-Part NDT
Fluorescent magnetic-particle inspection detects surface or near-surface defects.
Separated Component Packing
Dividers separate metal components. Restraints and moisture protection are agreed for the finished coupling and shipment.
Manufacturing, inspection and packing photographs for this product family.Equipment route varies by material and geometryRemote video inspection available before shipment
Frequently Asked Questions
What happens if the coupling decouples?
Above pull-out torque, a synchronous coupling can lose synchronism and the driven side may stall or rotate irregularly. Continued slip can generate heat, so define detection, shutdown and restart conditions. The published 1.3–2× ratio is a design reference; transient loads and the validated torque envelope determine the actual setting.
How efficient are magnetic couplings?
Efficiency depends on speed, load, gap, containment material and losses in the complete drive. The 99% headline is a published reference, not a test result for your design. Agree the torque/power measurement boundary and temperature-rise limits; conductive cans require an eddy-current-loss review.
Can you design the coupling for my existing pump?
Yes — send us your pump's torque requirement, shaft sizes, fluid, pressure, and temperature. We'll design a coupling retrofit with the decoupling torque, can material, and mounting interface specific to your application.
Do magnetic couplings need maintenance?
The magnetic members transfer torque without contact. Bearings, containment, fasteners, retention and the driven equipment still need inspection under the equipment maintenance plan; contactless torque transfer alone does not establish a maintenance-free pump.
Coupling Verification
Torque Characterization
Agree pull-out torque, operating duty and temperature conditions for design validation. Request the applicable torque-versus-angle or temperature data for the selected configuration; no project-specific curve is published on this page.
Containment Integrity
Pressure and leak testing of containment cans to your spec — for pumps, mixers and hermetic drives.
Dynamic Balance
Rotating assemblies balanced to your G-grade requirement; concentricity of hubs verified for smooth high-speed operation.
Operating Environment
Include medium, temperature, speed and available installation space when requesting a coupling review.
Share operating conditionsHave 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.