INDUSTRY COMPONENT

Armature Plate

Armature plate is the rotating component in electromagnetic clutch-brake units that engages/disengages torque transmission via magnetic attraction.

Component Specifications

Definition
The armature plate is a critical rotating component in industrial electromagnetic clutch-brake systems, typically mounted on the output shaft. It functions as the movable element that engages with the stationary electromagnetic coil assembly when energized, creating magnetic attraction that transmits torque through friction surfaces. During disengagement (de-energized state), spring mechanisms or air gaps separate the armature from the coil, interrupting torque transmission. Precision machining ensures flatness and parallel alignment to maintain consistent air gaps and engagement characteristics.
Working Principle
Operates on electromagnetic induction principles: when the stationary coil is energized, it generates a magnetic field that attracts the rotating armature plate, creating friction contact between the armature's friction surface and the coil's mating surface. This magnetic attraction transmits torque from the input to output side. De-energizing the coil eliminates magnetic attraction, allowing separation springs or centrifugal force to disengage the armature, interrupting torque transmission with minimal residual drag.
Materials
Low-carbon steel (AISI 1010/1018) with hardened friction surfaces, alternative materials include silicon steel laminations for reduced eddy currents, or aluminum alloys with steel inserts for weight reduction in high-speed applications. Surface treatments: phosphate coating for corrosion resistance, grinding to Ra 0.8-1.6μm surface finish.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Air Gap0.2-0.5 mm
Diameter50-300 mm
Thickness3-10 mm
Parallelism≤0.01 mm
Torque Capacity5-500 Nm
Flatness Tolerance≤0.02 mm
Maximum Rotational Speed3000-8000 rpm
Friction Surface Hardness45-55 HRC

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 16030, DIN 15435, JIS B 1452

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Magnetic adhesion failure
  • Thermal warping from overheating
  • Fatigue cracking at mounting holes
  • Corrosion in humid environments
  • Imbalance causing vibration
FMEA Triads
Trigger: Excessive heat generation during prolonged slip engagement
Failure: Thermal distortion changes air gap, reducing torque capacity
Mitigation: Incorporate cooling fins, use high-temperature materials, implement slip time monitoring
Trigger: Improper mounting causing misalignment
Failure: Uneven wear patterns and vibration transmission
Mitigation: Precision machining of mounting surfaces, use alignment fixtures during installation
Trigger: Material fatigue from cyclic loading
Failure: Crack propagation from mounting holes leading to catastrophic failure
Mitigation: Fillet radii on stress concentration points, regular non-destructive testing

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
Flatness: ±0.02mm, Thickness: ±0.05mm, Diameter: ±0.1mm, Hardness: ±3 HRC
Test Method
Magnetic pull force testing per ISO 16030, surface flatness via optical comparator, dynamic balance testing at 1.5x operational speed

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
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Armature Plate

Manufacturer profiles associated with Armature Plate.

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Frequently Asked Questions

What causes armature plate wear in clutch-brake units?

Primary wear factors include friction surface degradation from cyclic engagement, thermal stress from slip-generated heat, contamination from worn friction material particles, and misalignment causing uneven contact pressure.

How often should armature plates be inspected?

Visual inspection every 500 operating hours, dimensional checks every 2000 hours or 6 months. Replace when friction surface wear exceeds 20% of original thickness or flatness exceeds 0.05mm tolerance.

Can armature plates be resurfaced?

Limited regrinding is possible if minimum thickness specifications are maintained, but replacement is recommended when wear exceeds 30% as heat treatment integrity diminishes with material removal.

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.

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