EAK Liquid - Cooled Resistors: A Perfect Fit for Variable - Frequency Drive Applications in a Roots Pump System

In the dynamic landscape of industrial machinery, the efficient operation of variable - frequency drives (VFDs) is crucial. EAK's liquid - cooled resistors have proven to be an indispensable component in a specific industrial setup involving a Roots pump, where they address the complex power and cooling requirements with remarkable effectiveness.

The Roots pump in question operates under a stringent duty cycle within the VFD system. The VFD runs on a 45 - second work cycle, with a deceleration time ranging from 10 - 15 seconds. During this deceleration process, the frequency of the equipment drops from 80Hz to 20Hz. At 80Hz, the power consumption is approximately 4 - 5kW, while at 20Hz, it is around 3kW. Notably, the load remains constant throughout the frequency change from 80Hz to 20Hz.

One of the key challenges in this system is managing the energy generated during deceleration. To ensure the smooth operation of the Roots pump and protect the VFD components, a reliable braking mechanism is essential. This is where EAK's liquid - cooled resistors come into play.

The maximum current during the protection time is 48.7A. When calculating the power requirements for the braking resistor, it must satisfy the formula P>E xf, where E is the single - braking energy and f is the braking frequency. Additionally, a safety margin of 1.5 - 2 times is required. EAK's liquid - cooled resistors are precisely engineered to meet these demanding power requirements.

The liquid - cooling technology employed in EAK's resistors offers several advantages. First and foremost, it enables efficient heat dissipation. During the deceleration of the Roots pump, a significant amount of heat is generated in the resistor as it dissipates the excess energy. The liquid - cooling system, with its well - designed coolant circulation, can quickly carry away this heat, maintaining a stable operating temperature for the resistor. This not only extends the lifespan of the resistor but also ensures consistent performance over time.

Secondly, the liquid - cooled resistors from EAK are highly adaptable to the specific power demands of the Roots pump system. Their ability to handle the power fluctuations during the 80Hz to 20Hz frequency change, along with the required safety margin, makes them an ideal choice. They can effectively convert the electrical energy into heat and dissipate it, protecting the VFD from over - voltage and over - current conditions that could otherwise damage the system.

In this Roots pump application, EAK's liquid - cooled resistors have successfully met the challenging requirements of the VFD system. Their reliable performance has led to enhanced system stability, reduced downtime, and improved overall efficiency. As industries continue to seek more efficient and reliable solutions for their electrical systems, EAK's liquid - cooled resistors are set to play an increasingly important role. Whether it's in similar pump systems or other industrial applications with high - power and heat - dissipation demands, these resistors offer a proven solution. 
https://www.eak.sg/portfolio/liquid-cooled-resistors-application-in-variable-frequency-drive-for-roots-pump-dc-braking/


 

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