Huatao Group-Vibrating Screen Technology Solution and Service for Quarry & Mining Industry Since 2008.

manager11@huataogroup.com +86 18032422676

How to Select a Vibrating Screen Exciter

Why kN alone does not define the right exciter for your screen

2026-10-05

The Core Question

How do you choose the right exciter for a vibrating screen? Start with the required vibration motion and operating duty. Then match excitation force, speed, eccentric moment, amplitude, shaft configuration, bearing capacity, lubrication system, and mounting dimensions. VIBRATING SCREEN

Do not select by kN rating alone. The exciter must work as part of the complete screen system.

Why Exciter Selection Matters

The exciter creates the periodic force that moves the screen box. That movement determines how material is stratified, transported, and separated.

Undersized exciter: screen struggles to maintain motion under load; material accumulates on the deck; drive system loads increase.

Oversized or incorrectly configured exciter: dynamic stresses and bearing loads increase. Increasing eccentric mass beyond the original specification can reduce bearing service life and create an unbalanced condition.

The right question is not "what is the strongest exciter I can buy?"

What Determines the Right Exciter

1. Screening application. Primary scalping, coarse classification, fine screening, wet screening, dewatering, aggregate sizing, iron ore classification, coal preparation, mineral processing. Each requires different vibration characteristics.

2. Operating mass. Screen box, screening media, cross beams, exciter assembly, springs, material on the deck. The exciter moves the loaded machine, not an empty screen.

3. Required vibration motion. Single-shaft systems typically produce circular motion. Synchronized dual-shaft arrangements produce linear vibration.

Force, Speed, Amplitude, Static Moment

Exciting force: F = m × r × ω²

Where F is centrifugal force, m is eccentric mass, r is eccentric radius, ω is angular velocity. Speed changes have a disproportionate effect because angular velocity is squared.

Frequency and speed: Frequency (Hz) = RPM / 60. Example: 900 RPM = 15 Hz.

Amplitude: Peak amplitude and peak-to-peak displacement differ by 2×. 4 mm peak = 8 mm peak-to-peak. Confirm the definition before comparing.

Static moment: Useful for comparing replacement exciters. Ask for static moment, operating speed, excitation force, recommended amplitude, and shaft arrangement.

Motor power: Necessary but not sufficient. Two exciters with the same kW can differ in force, speed, eccentric moment, bearings, lubrication, and mounting.

Exciter Types

Type	Motion	Best Application
Mechanical eccentric-shaft	Circular	Heavy-duty mining, coarse scalping
Dual-shaft geared	Linear	Coal processing, controlled direction
Vibrator motors	Circular or linear	Simpler arrangements, lighter duty
High-frequency	Linear, low amplitude	Fine screening, certain dewatering duty

Compatibility Checks

Mounting dimensions: overall length, width, height, bolt-hole pattern, mounting flange dimensions, shaft extension dimensions, shaft centre distance, drive connection, oil inlet and drain locations.

Bearing configuration: affects load capacity, operating temperature, fatigue life, lubrication requirements, maintenance intervals, and reliability. Heavy-duty spherical roller bearings are commonly specified.

Lubrication: grease, oil-bath, thin-oil circulation, or manufacturer-specific arrangements. Never convert a grease-lubricated exciter to oil lubrication without engineering confirmation.

Sealing: must suit the environment — high-dust, wet, abrasive, high-impact, outdoor, or extreme temperature.

Failure Analysis

Problem	Possible Cause	Recommended Solution
Insufficient screen motion	Undersized exciter	Verify force and speed against operating mass
Excessive vibration	Oversized eccentric mass	Reduce eccentric mass to specification
Bearing failure	Excessive amplitude, wrong lubrication	Verify amplitude and lubrication
Overheating	Lubrication breakdown, seal failure	Check oil level, cooling, seals
Poor fitment	Mounting dimension mismatch	Verify bolt pattern and shaft geometry

Case Study

Customer Type: Iron ore processing plant
Ore Type: Coarse hematite, abrasive
Operating Conditions: Heavy-duty scalping, continuous operation
Problem: Premature exciter failure from excessive amplitude and bearing overload following unapproved eccentric mass increase.
Solution: Reverted to original eccentric mass specification; heavy-duty spherical roller bearings; verified mounting dimensions.
Result: Bearing service life restored; vibration levels returned to specification; unplanned downtime reduced.

FAQ

Can I replace an exciter with a higher-force model?
Not automatically. Higher force alters dynamic loads, amplitude, and bearing loading. Check against screen structure, bearings, springs, speed, and required vibration parameters.

Force or speed — which matters more?
Neither independently. Force depends on eccentric mass and speed. Performance also depends on amplitude, motion direction, and machine dynamics.

Single-shaft or dual-shaft?
Start with required vibration motion and existing design. Single-shaft = circular. Dual-shaft = linear. Selection depends on screen structure.

Oil or grease lubrication?
Not universally better. Oil suits continuous heavy-duty heat management. The lubrication method must be designed for the specific exciter.

What information for a replacement exciter?
Screen model, dimensions, material, capacity, existing exciter model, speed, force or static moment, amplitude, motor data, mounting dimensions, and photos of nameplate and mounting area.

What is static moment?
Describes the eccentric rotating mass configuration. Useful for comparing replacement exciters beyond nominal force.

Peak amplitude vs peak-to-peak?
Peak amplitude is maximum displacement from centre. Peak-to-peak is total travel. Factor of 2 difference.

Can I select by motor power?
No. Same kW can mean different force, speed, eccentric moment, bearings, lubrication, and mounting.

What bearings are used?
Heavy-duty spherical roller bearings for high radial loads and vibration conditions.

How do I compare suppliers?
Exciter type, force, speed, static moment, amplitude, motor power, bearing type, lubrication, cooling, mounting dimensions, shaft dimensions, housing material.

Conclusion

Choosing the right exciter is a system-matching problem. The correct exciter must match vibration motion, operating mass, screening duty, capacity, force, frequency, amplitude, static moment, bearing requirements, lubrication system, mounting dimensions, and environmental conditions.

For replacement projects, reproduce the original machine's critical dynamic and mechanical parameters before considering upgrades.

Related Articles

Related Products