In high-speed rotating machinery, "Unbalance" is the leading cause of mechanical failure. When a fan impeller has an uneven distribution of mass, it generates centrifugal forces that increase exponentially with speed. Left unchecked, this vibration destroys bearings, fatigues motor mounts, and can even cause structural cracks in ductwork.
As a core specialty of our Mechanical Fan Overhaul program, EKG provides In-Situ Dynamic Balancing—correcting the vibration while the fan is fully assembled and running in its own bearings.
Unbalance occurs when the center of mass does not align with the geometric center of the shaft.
Static Unbalance: The "heavy spot" makes the fan want to roll to the bottom when at rest.
Dynamic Unbalance: Occurs when the heavy spots are at different positions along the length of the impeller, causing the fan to "wobble" or "rock" from side to side.
The Force Multiplier: If you double the fan speed, the vibration force increases by four times. This is why balancing is critical before integrating a Variable Frequency Drive (VFD) for energy savings.
We use dual-channel digital vibration analyzers to perform a "Scientific Correction" rather than a "Trial and Error" approach.
Initial Vibration Scan: We measure the "Velocity" (mm/s) and "Phase Angle" (degrees) of the vibration. This tells us exactly where the heavy spot is located.
Trial Weight Attachment: We attach a known mass at a specific angle and measure the system's "Response."
Vector Calculation: Our software calculates the exact weight and angle required for a permanent correction.
Permanent Correction: We weld, bolt, or clip high-density weights to the impeller.
Final Verification: We aim for ISO 1940 G2.5 standards—a level of balance so precise that the fan operates with a "silky" smoothness, significantly reducing noise and heat.
An unbalanced fan is an "Energy Thief." Vibration is essentially wasted kinetic energy that should be moving air but is instead being dissipated as heat and structural stress.
Mechanical Efficiency: A balanced fan requires less torque to maintain its RPM, reducing the motor's amperage draw.
The Math: By eliminating parasitic vibration, the Variable Frequency Drive (VFD) can operate the fan more efficiently. According to the Cube Law, a 20% reduction in fan speed—made stable by precision balancing—results in a nearly 50% reduction in power consumption.
| Grade | Application | EKG Performance Target |
| G6.3 | Standard Commercial Fans | Passable |
| G2.5 | High-Efficiency HVAC / AHUs | EKG Standard |
| G1.0 | Small Precision High-Speed Blowers | Special Applications |
| G0.4 | Gyroscopes / Grinding Machine Drives | Laboratory Grade |
In-Situ Service: We balance your fans "In-Place." There is no need to dismantle the fan or send the impeller to a workshop, saving you days of building downtime and expensive rigging costs.
Vibration Fingerprint Report: We provide a comprehensive "Before & After" spectrum report. This acts as a "Birth Certificate" for your overhauled fan, proving it meets international ISO 10816 vibration standards.
Holistic Diagnostics: We don't just "chase the weight." If the vibration is caused by a bent shaft, loose mounting bolts, or a failing bearing (Resonance), our troubleshooting tools will identify the true root cause.
Thermal Post-Audit: We use infrared thermography to ensure that the reduction in vibration has successfully lowered the operating temperature of your motor and fan bearings.
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