INDUSTRY COMPONENT

Eccentric Weight

Eccentric weight is a rotating mass component in vibration motors that creates controlled imbalance to generate mechanical vibrations.

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Component Specifications

Definition
An eccentric weight is a precisely engineered rotating mass with its center of gravity intentionally offset from its rotational axis. When mounted on a motor shaft, this offset creates centrifugal force during rotation, producing controlled mechanical vibrations. The component is fundamental in vibration motors and exciters used across industrial applications for material handling, compaction, screening, and conveying processes.
Working Principle
The eccentric weight operates on the principle of rotational imbalance. When rotated by a motor, the offset mass generates centrifugal force proportional to the square of rotational speed and the mass-distance product. This force creates sinusoidal mechanical vibrations transmitted through the motor housing to the attached equipment or structure.
Materials
Typically manufactured from high-density materials: cast iron (GG20, GG25), ductile iron (GGG40, GGG50), or steel alloys (C45, 42CrMo4). Surface treatments include phosphating, zinc plating, or powder coating for corrosion resistance.
Technical Parameters
  • Mass 0.1-50 kg
  • Max RPM 3000-10000
  • Mounting Keyway, taper lock, or threaded shaft
  • Eccentricity 5-150 mm
  • Balance Grade G6.3 per ISO 1940
  • Centrifugal Force 100-50000 N
Standards
ISO 1940-1, ISO 10816, DIN 45665, DIN 45691

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Eccentric Weight.

eccentric weight vibration motor component exciter weight rotating imbalance mass centrifugal force generator industrial vibration equipment Eccentric Weight in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Vibration Motor/Exciter

A motorized device that generates controlled mechanical vibrations for material separation and screening applications.

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Rotor with Eccentric Weight

A rotating component with an off-center mass that generates centrifugal force to produce vibration.

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Shaker Motor

An electric motor designed to generate controlled vibrations for cleaning applications.

View Product Details

Engineering Analysis

Risks & Mitigation
  • Fatigue failure from cyclic loading
  • Imbalance causing bearing wear
  • Resonance with supporting structure
  • Fastener loosening from vibration
FMEA Triads
Trigger: Material fatigue from cyclic stress
Failure: Crack propagation leading to catastrophic fracture
Mitigation: Regular NDT inspection, proper material selection with adequate fatigue strength, stress relief treatments
Trigger: Improper balancing during manufacturing
Failure: Excessive vibration, reduced bearing life, noise
Mitigation: Precision balancing to ISO 1940 standards, verification testing, proper mounting procedures
Trigger: Corrosion in harsh environments
Failure: Mass change affecting balance, structural weakening
Mitigation: Appropriate surface coatings, regular inspection, environmental controls

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.5% mass tolerance, ±0.1 mm eccentricity tolerance, G6.3 balance grade
Test Method
Dynamic balancing per ISO 1940-1, material testing per ASTM standards, centrifugal force verification at rated RPM

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

How does eccentric weight mass affect vibration amplitude?

Vibration amplitude is directly proportional to eccentric weight mass and eccentricity distance. Increasing either parameter increases centrifugal force and resulting vibration amplitude, following F = m × ω² × r where m is mass, ω is angular velocity, and r is eccentricity.

What maintenance is required for eccentric weights?

Regular inspection for cracks, wear on mounting surfaces, and corrosion. Periodic re-balancing may be needed after extended operation. Lubrication of mounting interfaces according to manufacturer specifications.

Can eccentric weights be adjusted for different vibration frequencies?

Fixed eccentric weights produce vibration frequency equal to rotational speed. Some designs allow mass adjustment or multiple weights for force variation, but frequency changes require variable speed motor control.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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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