Good practice

Installation of frequency inverters for electric motors

Installation of frequency inverters for electric motors
©industrieblick, image #53665632, 2017, source:
Energy, Carbon
Manufacturing of machinery and equipment
High cost
Annual saving:
8 - 15% / 34567€
Payback time:
2.9 Year(s)
Resource savings: Energy:
388 GJ per year
Associated cost savings: Energy:
Total cost savings:
There was no reduction or increase in operating costs
Premises and operation areas:
Production processes
Size of company:
Medium (less than 250)
Advancement in applying resource efficiency measures:
One off investment:

Ageing induction motor got an overdue upgrade

  • Upgrading VSH’s 45-year-old electric induction motors yielded results
  • Reduced energy consumption of ~388 GJ, saving € 34 567 yearly
  • Investment in motor efficiency controllers will pay for itself within 3 years   

The Czech company VSH produces and sells building materials, including a cement plant which was built in 1973.

In need of an upgrade, the cement plant’s ageing electric induction motors were equipped with efficiency controllers (frequency inverters) which adapt the load and volume.

A motor efficiency controller (MEC) reads the situation, reducing power during lighter loads and increasing it as and when needed, while keeping the motor running at a constant speed.

Key results

This energy saving measure cost the company € 99 405 to set up. The yearly energy saved is estimated at around 388 GJ, which works out to around € 34 567.

There has been no observed reduction or increase in operating costs. The company believes it will be able to recoup the initial investment in under three years.


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