INDUSTRY COMPONENT

Eccentric Mass (ERM)

An eccentric rotating mass component that generates vibration through rotational imbalance in vibration motors.

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Component Specifications

Definition
An Eccentric Rotating Mass (ERM) is a precisely engineered component consisting of a mass attached off-center to a rotating shaft within a vibration motor. When rotated, the offset mass creates a centrifugal force that produces controlled vibration through rotational imbalance. This component is fundamental in converting electrical energy into mechanical vibration energy in various industrial applications.
Working Principle
The ERM operates on the principle of rotational imbalance. When the motor rotates the shaft, the eccentric mass creates an unbalanced centrifugal force. This force varies directionally as the mass rotates, generating periodic oscillations that translate into vibration. The vibration amplitude is proportional to the mass offset distance and rotational speed squared, while frequency matches the rotation rate.
Materials
Typically made from high-density materials like tungsten alloys (17-19 g/cm³) or steel (7.8 g/cm³) for maximum mass efficiency. The shaft is usually hardened steel or stainless steel. Some applications use brass or copper alloys for specific density requirements.
Technical Parameters
  • Mass 0.5-50 grams
  • Current Draw 10-500 mA
  • Rotation Speed 100-20,000 RPM
  • Life Expectancy 100-1000 hours continuous operation
  • Offset Distance 1-10 mm
  • Vibration Force 0.1-50 G
  • Operating Voltage 1.5-24 VDC
  • Temperature Range -20°C to +85°C
Standards
ISO 10816, DIN 45672, IEC 60034

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Eccentric Mass (ERM).

eccentric mass ERM motor vibration component rotating imbalance industrial vibration motor parts centrifugal force vibration drive Eccentric Mass (ERM) Eccentric Mass (ERM) in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Vibration Drive (e.g., Solenoid or ERM Motor)

A component that generates mechanical vibrations through electromagnetic or electromechanical means, typically used as the actuating element within a vibration mechanism.

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Engineering Analysis

Risks & Mitigation
  • Bearing wear from unbalanced loads
  • Fatigue failure at shaft attachment points
  • Resonance with machine structures
  • Overheating from continuous operation
  • Loosening of mounting hardware
FMEA Triads
Trigger: Material fatigue at shaft interface
Failure: Mass detachment during operation
Mitigation: Use stress-relieved materials, proper fillet radii, and regular inspection protocols
Trigger: Bearing lubrication breakdown
Failure: Increased friction and overheating
Mitigation: Implement scheduled maintenance, use high-temperature lubricants, monitor temperature
Trigger: Resonance with machine natural frequency
Failure: Excessive vibration damaging surrounding components
Mitigation: Conduct vibration analysis during design, use damping materials, adjust operating speeds

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Mass balance tolerance: ±2% of nominal weight; Offset distance tolerance: ±0.1 mm; Runout tolerance: 0.05 mm maximum
Test Method
Vibration testing per ISO 10816 using accelerometers, mass verification via precision scales, rotational balance testing on dynamic balancers, endurance testing at maximum rated speed

Buyer Feedback

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Frequently Asked Questions

What is the main function of an eccentric mass in vibration motors?

The eccentric mass creates rotational imbalance when spun by the motor shaft, generating centrifugal forces that produce controlled vibration for various industrial applications.

How does material selection affect ERM performance?

Higher density materials like tungsten allow smaller physical sizes for the same vibration force, improving design flexibility. Material choice also affects durability, corrosion resistance, and temperature tolerance.

What factors determine vibration intensity in ERM systems?

Vibration intensity depends on mass weight, offset distance from rotation center, and rotational speed squared. Higher mass, greater offset, and faster rotation all increase vibration force.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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