Protect Your Motors from VFD Damage — A Smarter Way to Extend Equipment Life
In industrial environments, Variable Frequency Drives (VFDs) have become essential. But alongside energy savings and control benefits, they introduce a hidden problem: high-frequency currents.
These currents can wreak havoc on electric motors — causing overheating, bearing fluting, and electromagnetic interference (EMI) that disrupts surrounding electronics.
The Problem: Shaft Voltage & Bearing Damage
When VFDs drive motors, they can induce harmful high-frequency currents into the motor shaft. These stray currents take the path of least resistance—often through the motor bearings—causing:
- Motor Bearings: High-frequency VFD currents travel through the motor shaft and discharge through the bearings, causing electrical pitting and fluting
- EMI: These currents can also radiate through power cables and disrupt nearby sensors, PLCs, and control systems.
- Downtime: The result is unexpected shutdowns, equipment failures, and costly repairs.
Traditional fixes like grounding brushes or insulated bearings only go so far. And they don’t address the root cause.
The Solution: CoolBLUE® + NaLa® Chokes
CoolBLUE® Common Mode Chokes and NaLa® Differential Mode Chokes work together to filter out these damaging high-frequency currents — protecting your motors, bearings, and electronics without modifying your equipment.
Why It Works Better Than Grounding Rings or Brushes
CoolBLUE® and NaLa® offer a targeted electrical solution. Instead of treating the symptoms with grounding rings or brushes, they reduce the actual damaging currents — stopping problems at the source.
Key Benefits
Bearing Protection
CoolBLUE® and NaLa® minimize noise and suppress peak currents, reducing pitting, frosting, and fluting that damage bearings and shorten motor life.
Electrical System Reliability
These chokes absorb harmful high-frequency EMI currents before they can affect nearby electronics, preventing ghost shutdowns and signal interference.
Easy Installation
CoolBLUE® and NaLa® integrate easily into new or existing systems, with no complex rewiring. Fast to install, with minimal downtime.
Reduce Downtime
By preventing electrical fluting and EMI faults, plants experience fewer failures, less troubleshooting, and increased uptime.
Extend Motor Life
Protecting against electrical wear significantly increases motor lifespan and reduces the frequency of bearing replacements.
Protect Nearby Electronics
CoolBLUE® and NaLa® act like a surge protector for your motor cables — keeping sensitive nearby equipment safe from EMI noise.
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