Product Overview
Disc Magnetic Couplings
Disc magnetic couplings are non-contact torque transmission assemblies using two face-to-face magnet discs arranged across an axial air gap or separation wall. Torque is transferred by the magnetic attraction and shear force between opposed pole patterns, allowing the driving side and driven side to rotate synchronously without mechanical contact.
Compared with coaxial radial-gap couplings, disc magnetic couplings are especially useful when the available structure is short in the axial direction, when two parallel faces need to transmit torque through a flat barrier, or when the customer requires a compact clutch-like magnetic drive module. Typical assemblies include magnetized discs, segmented magnets, steel back plates, hubs, sleeves, adhesive, coating and final torque, polarity, runout and balance inspection.
Ningbo Vanguard Technologies supplies customized disc magnetic couplings using NdFeB, SmCo or ferrite magnets according to required torque, disc diameter, axial gap, pole count, working temperature, corrosion environment, speed, bearing layout and installation interface. We support magnetic circuit review, pole pattern design, rotor machining, magnet bonding, back iron optimization and prototype validation.
Whether you need a prototype disc magnetic coupling for sealed transmission testing or a production-ready magnetic drive assembly for OEM equipment, Vanguard can provide sample assemblies within 10-20 days after torque target, drawings, gap, magnet grade and inspection requirements are confirmed.
Quick View
Disc Magnetic Coupling Selection Snapshot
Axial Gap
Face-to-Face Magnetic Drive
Two magnet discs transmit torque across a flat axial air gap or non-magnetic barrier.
Compact
Short Assembly Length
A disc layout is suitable when radial space is available but axial installation length is limited.
No Contact
Wear-Free Torque Transfer
Magnetic torque transmission reduces friction, lubricant demand and mechanical wear.
10-20 Days
Prototype Lead Time
Fast sampling after torque, diameter, axial gap, pole count and interface drawings are confirmed.
Disc Coupling Design Focus
1Torque TargetRated torque, slip torque
2Disc LayoutDiameter, thickness, hub
3Pole PatternSegment count, magnetization
4Rotor BuildBonding, back iron, balance
5Final TestTorque, gap, runout
Key Applications
Sealed Rotary Drives
Face-to-face magnetic drive modules for sealed shafts, flat barriers and compact transmission structures.
Magnetic Clutch Modules
Slip-torque magnetic coupling structures for overload protection and torque-limited transmission.
Mixers & Agitators
Disc coupling assemblies for sealed stirring, laboratory equipment and compact tank-drive designs.
Chemical & Clean Systems
Non-contact torque transfer through non-magnetic plates for corrosive or contamination-sensitive equipment.
Medical & Laboratory Devices
Compact, clean and low-wear disc coupling solutions for analytical instruments and small fluid systems.
OEM Automation Modules
Custom disc magnetic coupling assemblies for compact automation, rotary indexing and special-purpose machines.
Technical Data
Typical Disc Coupling Specifications
The following options are commonly used for custom disc magnetic couplings. Final specifications are confirmed according to torque, disc diameter, magnet layout, axial air gap, speed, temperature and shaft or hub interface.
|
Item |
Available Options |
Engineering Notes |
|
Coupling Layout |
Face-to-face disc coupling, axial-gap coupling, magnetic clutch-style coupling |
Disc couplings are selected when torque is transmitted across a flat axial gap or partition plate. |
|
Torque Range |
Miniature low-torque module to customized high-torque assembly |
Torque depends on disc diameter, magnet area, pole count, axial gap, back iron and operating temperature. |
|
Magnet Material |
NdFeB, SmCo, ferrite |
NdFeB offers high torque density; SmCo is preferred for high temperature; ferrite is economical for larger lower-torque designs. |
|
Magnet Shape |
Segment magnet, block magnet, disc magnet, ring magnet, multipole magnetized ring |
Segmented magnets allow flexible pole patterns and higher effective torque in custom discs. |
|
Pole Count |
2-pole to multi-pole axial magnetization pattern |
Pole count affects holding torque, torque ripple, alignment sensitivity and assembly complexity. |
|
Axial Gap |
Air gap, stainless plate, plastic wall, ceramic barrier or customer housing |
Gap has a strong influence on transmitted torque. The full barrier thickness must be included in design review. |
|
Rotor / Hub Material |
Carbon steel, stainless steel, aluminum alloy, engineering plastic |
Back iron and hub material influence flux return, strength, corrosion resistance and mass moment of inertia. |
|
Inspection |
Dimension, polarity, flux, torque, axial runout, concentricity, balance |
Inspection records can be provided according to prototype validation or batch production requirements. |
Structure Comparison
Disc Coupling Structure Options
|
Structure |
Magnetic Layout |
Best Fit |
Design Attention |
|
Standard Disc Coupling |
Two opposed magnet discs with axial air gap |
Compact sealed drive, light machinery and prototype testing |
Axial gap, disc flatness, pole alignment and runout control. |
|
Segmented Disc Coupling |
Arc or block magnets bonded on steel back plates |
Custom torque level, flexible diameter and OEM module design |
Bonding fixture, magnet spacing, polarity sequence and adhesive strength. |
|
Multipole Ring Disc Coupling |
Axially magnetized multipole ring or disc magnet |
Small devices, compact instruments and smoother assembly process |
Magnetization accuracy, pole pitch, temperature limit and available magnet size. |
|
Torque-Limiting Disc Coupling |
Designed slip torque for overload protection |
Magnetic clutch, indexing unit and equipment protection |
Slip torque repeatability, heat during slip and safe operating duty cycle. |
|
High-Temperature Disc Coupling |
SmCo or high-temperature NdFeB with suitable adhesive and hub |
Hot chambers, chemical equipment and thermal test systems |
Magnet grade, adhesive, coating, back plate material and thermal expansion. |
Engineering Selection
Design Points for Disc Magnetic Couplings
Torque & Slip Margin
Rated torque, startup torque and allowable slip torque should be defined before disc diameter, magnet area and pole count are selected.
Axial Gap Control
Disc coupling torque drops quickly as axial gap increases. Barrier thickness, flatness and bearing clearance should be reviewed together.
Pole Pattern & Alignment
Pole count, magnet spacing and angular alignment affect torque ripple, synchronous lock and assembly repeatability.
Back Plate & Runout
Back iron improves flux return, while disc flatness, axial runout and dynamic balance affect stable rotation at speed.
Quality Control
Manufacturing & Inspection Capability
Magnet Bonding
Segment magnet bonding, polarity orientation, angular positioning and adhesive curing are controlled with dedicated fixtures.
Disc Machining
Hub, back plate, shaft bore, keyway, mounting holes, flatness and axial runout can be machined and inspected according to drawings.
Magnetic Verification
Pole sequence, surface flux, torque direction, slip torque and coupling performance can be checked under agreed test conditions.
Balance & Protection
Dynamic balance, coating, encapsulation, anti-corrosion protection and safe packaging are available for rotating assemblies.
Request a Quote
Information Needed for Fast Quotation
To speed up engineering review, please provide a drawing or confirm the specifications below. If the coupling transmits torque through a plate, sealed cover or customer housing, please include the barrier material and thickness.
-
Rated torque, startup torque, slip torque, rotation speed and duty cycle
-
Disc diameter, magnet thickness, hub or shaft interface and available installation space
-
Axial air gap, barrier material, wall thickness, flatness and pressure condition if applicable
-
Working temperature, corrosion environment, coating requirement and magnet material preference
-
Sample quantity, annual volume, inspection requirement, packaging and delivery schedule
Support
Frequently Asked Questions
What is the difference between disc and coaxial magnetic couplings?
A disc magnetic coupling uses two face-to-face magnet discs and transfers torque across an axial gap. A coaxial coupling uses inner and outer rotors and transfers torque across a radial gap.
Can a disc magnetic coupling transmit torque through a sealed plate?
Yes. Disc couplings can work through non-magnetic plates such as plastic, stainless steel or ceramic barriers, but barrier thickness directly increases the magnetic gap and reduces torque.
How is slip torque controlled?
Slip torque is adjusted by disc diameter, magnet area, magnet grade, pole count, axial gap and back iron design. Test conditions should be defined for repeatable measurement.
Can the disc coupling be balanced for high speed?
Yes. For rotating applications, we can review hub structure, magnet symmetry, adhesive distribution, axial runout and dynamic balance requirements according to target speed.
