Eccentric Mass (ERM): Temperature Range -20°C to +85°C

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

Parameter	Typical range	Notes & selection driver
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

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 10816, DIN 45672, IEC 60034

Parent Products

This component is used in the following industrial products

Vibration Drive

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

Typical Suppliers & Equivalents

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

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 Eccentric Mass (ERM)

Manufacturer profiles associated with Eccentric Mass (ERM).

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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.

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.

Eccentric Mass (ERM)