Driven magnet assembly: Torque Capacity 5-500 Nm

Component Specifications

Definition

The driven magnet assembly is a critical component in magnetic coupling systems, consisting of permanent magnets arranged in a specific pattern and mounted on a rotor. It operates without mechanical contact with the driving magnet assembly, creating a hermetic seal barrier while transmitting torque through magnetic flux. This assembly is typically housed in a non-magnetic containment shell and rotates in response to the magnetic field generated by the driving magnet assembly, enabling torque transmission across sealed barriers in pumps, mixers, and other industrial equipment.

Working Principle

Operates on the principle of magnetic torque transmission through synchronized magnetic fields. When the driving magnet assembly rotates, its magnetic field induces rotation in the driven magnet assembly through magnetic attraction and repulsion forces, without any physical connection. The torque capacity depends on magnet strength, air gap distance, and magnetic circuit design.

Materials

Neodymium iron boron (NdFeB) or samarium cobalt (SmCo) permanent magnets, 316 stainless steel or titanium containment shells, aluminum or composite rotor structures, epoxy encapsulation for corrosion protection

Technical Parameters

Parameter	Typical range	Notes & selection driver
IP Rating	IP68 for submerged applications
Magnet Grade	N35-N52 (NdFeB) or 2:17 (SmCo)
Maximum Speed	3000-10000 RPM
Torque Capacity	5-500 Nm
Air Gap Tolerance	±0.1 mm
Operating Temperature	-40°C to 200°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 1940-1, DIN 740, IEC 60034, API 610

Parent Products

This component is used in the following industrial products

Magnetic Coupling

A non-contact torque transmission device that uses magnetic fields to transfer motion through a barrier.

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Engineering Analysis

Risks & Mitigation

Magnet demagnetization due to overheating
Corrosion in aggressive chemical environments
Eddy current losses at high speeds
Magnetic particle contamination in cleanroom applications
Torque slip during overload conditions

FMEA Triads

Trigger: Excessive operating temperature beyond magnet rating
Failure: Permanent demagnetization and torque loss
Mitigation: Implement temperature monitoring systems, use high-temperature magnet grades (SmCo), and improve cooling through heat sinks or forced air circulation

Trigger: Corrosive fluid penetration into containment shell
Failure: Magnet corrosion and magnetic circuit degradation
Mitigation: Use corrosion-resistant materials (titanium, Hastelloy), apply protective coatings, and implement double containment with leak detection

Trigger: Misalignment between driving and driven assemblies
Failure: Increased vibration, reduced efficiency, and bearing wear
Mitigation: Precision alignment during installation, use flexible couplings, and implement laser alignment verification procedures

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Radial runout: ≤0.05 mm, Axial play: ≤0.1 mm, Magnetic balance: ≤5 g·mm/kg

Test Method

Torque testing via dynamometer, magnetic flux measurement with gaussmeter, rotational balance per ISO 1940-1 G2.5, hermetic seal testing per API 682, temperature cycling from -40°C to maximum rated temperature

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Driven magnet assembly

Manufacturer profiles associated with Driven magnet assembly.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the main advantage of using a driven magnet assembly?

The primary advantage is contactless torque transmission, which eliminates mechanical wear, prevents leakage in sealed systems, and requires no lubrication, making it ideal for hazardous or sterile environments.

How does temperature affect driven magnet assembly performance?

High temperatures can cause permanent magnet demagnetization, particularly with NdFeB magnets above 80°C. SmCo magnets offer better temperature stability up to 350°C but are more expensive. Proper thermal management is critical for maintaining torque capacity.

What maintenance is required for driven magnet assemblies?

Minimal maintenance is needed due to the contactless design. Primary concerns are monitoring bearing wear in supporting structures, checking for corrosion on containment shells, and verifying magnetic strength degradation over time through periodic torque testing.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Driven magnet assembly