VLT Drives
> Home
> Products
> VLT FlexConcept
> ECplus Concept
> Drive Configurator
> Manuals, Approvals and Drawings
> Marine Approvals
> Brochures & Factsheets
> Software Downloads
> Fieldbus Communication
> Connecting & Programming your VLT drive
> Industries We Serve
> Case Stories
> Service & Support
> News & Press
> Exhibitions
> About ...
> How to ...
> Contact Form
> VLT Newsletter Subscription
> News Archive

Follow us:

Danfoss on Facebook Danfoss on Twitter Danfoss on LinkedIn Danfoss on YouTube
 
 
 
 
 
Danfoss Logo

Optimum System Efficiency

-  does the best motor efficiency yield the best system efficiency?
Improving efficiency is an easy way to reduce energy consumption. The European Union has
therefore introduced minimum efficiency performance standards (MEPS) for three-phase induction
motors

More about Legislation & Motor Efficiency Classes

However, system operators must always take the entire system into account in order to ensure effective energy savings. The decisive factor for users is not the efficiency of individual components,
but rather the efficiency of the overall system. What is the benefit of a high-efficiency motor design
if some types of bearings (for example) reduce motor efficiency more than others? This principle
also applies to the overall system, since optimal system efficiency is the key to reducing energy
consumption and thereby reducing costs.

System efficiency is calculated according to VDI DIN 6014 by multiplying the efficiencies of the components:



A practical HVAC example can be seen in the EC versions of radial fans with external-rotor motors.
To achieve the extremely compact construction, the motor extends into the intake area of the
impeller. This impairs the efficiency of the fan, and therefore the efficiency of the entire ventilation
unit. As a result, high motor efficiency does not lead to high system efficiency.



The illustration highlights another benefit when using PM motors in IEC standard frame sizes:
the possibility to retrofit existing systems and thereby improve system performance.

More about Retrofit
Danfoss VLT drives energy saving ECplus

Danfoss EC+ Concept

Systematic energy saving

Increase your overall system efficiency, achieve a higher energy class certification and save costs with the Danfoss EC+ concept.