Eddy Current Variable Speed Drives and Digital Controls Provide TRUE System Efficiency and Performance

Dynamatic® variable speed drive clutches on induction motors have been installed in wastewater treatment applications for many decades, primarily due to the inherent durability, simplicity, and reliability of eddy current technology. Even though variable frequency drives (VFDs) gained popularity in the 1980s, real-world experiences at facilities worldwide have proven that only Dynamatic® can bring TRUE system efficiency to your operation.

SPMV Drives

Dynamatic® Salient Pole
Eddy Current Drive

SPMV Drives

Dynamatic® AT Vertical
Eddy Current Drive

  • Up to 65% less initial cost than VFDs in medium voltage applications

  • No ancillary costs for conditioning/cooling and harmonic suppression

  • Lower cost installation and commissioning due to less complex systems

  • Simple to use digital control integration

  • Electronics are 60-70% smaller than comparable medium voltage VFDs

  • Uses less energy to operate in than VFDs

  • Lower peak demand costs: no multiple, medium voltage motor starting/stopping

  • Capable of continuous operation in 40° C ambient temperature

  • Proven rugged and reliable electromagnetic clutch design

  • Outlast VFDs by as much as 6:1

  • Easy to maintain by on-site staff using low-cost parts

  • Unaffected by power quality fluctuations that can destroy VFDs


How Does Eddy Current Work?

Advantages of Eddy Current

SPMV Drives

Save up to 65% on capital pump-drive system costs

  • Dynamatic® systems have outlasted and outperformed variable frequency drives (VFDs) in a wide range of medium voltage wastewater applications.
  • A Dynamatic® Eddy Current pump drive system can save your municipality hundreds of thousands of dollars in capital costs alone.
  • Savings are typically 50% to 60% compared to the initial cost of VFD systems in medium voltage applications.

Lowest energy costs for wastewater pumping applications

The operating efficiency of a Dynamatic® drive increases relative to the normal operating speed of a motor. This makes the Dynamatic® drive ideally suited to most wastewater pumping applications, which typically require controlled speed within the range of from 75% to 100% of the motor’s rated speed. In contrast, the operating efficiency of a adjustable frequency drive decreases across this range.

Minimize ownership costs with reduced maintenance, repairs and upgrades

  • Dynamatic® drives are rugged and proven reliable electromagnetic clutch design is highly tolerant of fluctuations in power quality.
  • Dynamatic® systems produce virtually no harmonic noise into your plant’s electrical system or onto the utility grid.

By comparison, VFDs continue to be complex devices bearing higher ownership costs with shorter product life cycles. These significantly higher costs are attributable to quicker VFD product series obsolescence, faster parts obsolescence and earlier forced product replacements.

Achieve TRUE system efficiency with Dynamatic® Digital Controls

  • Dynamatic® EC-2000 Digital Controls are the perfect solution for new installations or retrofitting all brands of eddy-current drives.
  • The EC-2000 control is a simple, versatile, digital, electromagnetic drive control featuring local and remote access to programmable run presets.
  • The control is PLC and SCADA compatible, the outputs do not require separate external DC supply. Learn more about Dynamatic® EC-2000 controls.
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