Frequency converters (VFD)

Together with Schneider Electric, Hoyer Drives & Controls offers VFD frequency converters. With Hoyer Drives & controls as the sole point of contact, you have a partner who understands your application requirements and delivers a complete motor and VFD solution to optimise your supply chain.

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Wide range of communication functions
Display for local programming
For centralised or decentralised installation
Range from 0.37-1800 kW
Vis ikke animationer
Bredt udvalg af kommunikationsfunktioner
Display til lokal programmering
Til central eller decentral installation
Range fra 0,37-1800 kW

Why use a VFD frequency converter?

With greater demands on process optimisation and energy savings, the VFD frequency converter has become an important component for speed and torque regulation of electric motors.
With a VFD you can achieve the following benefits:

  • Energy savings up to 50%
  • Precise speed and torque control
  • Optimised process control
  • Soft start and stop
  • Savings on other control equipment

General information

The demand for higher energy efficiency and process optimisation means that our electric motors are often controlled by frequency converters.

As experts in electric motors and frequency converters, we have a strategic partnership for VFD frequency converters with the market leading manufacturer of VFDs, Schneider Electric. This ensures that we can offer an optimal mix of technical insight and commercial flexibility while always offering Hoyer as the sole point of contact. We offer combined motor and VFD solutions that match your market, application and project requirements.

ATV 630

VFD for process control.
Panel installation

ATV 650

VFD for process control.

ATV 930

VFD for precise torque and speed control.
Panel installation

ATV 950

VFD for precise torque and speed control.

Hoyer's range of frequency converters

At Hoyer, we pride ourselves on providing a diverse and versatile selection of Variable Frequency Drives (VFDs) tailored to meet the exacting requirements of various industrial applications.

Our product range spans from compact, low-power VFDs ideal for simple applications, to robust, high-power drives designed for complex industrial processes. Whether it's for a VFD pump, where precision and efficiency are paramount, or a broader VFD drive application, our solutions are engineered for optimal performance. 

ATV650 Stand-alone VFD

Stand-alone (high protection class)

Our stand-alone drives can be both centralised and decentralised solutions. They are used in a wide range of applications in all our segments. Compared to integrated solutions, they support all motor sizes in the Hoyer Motors range. In addition, they ensure savings on control panels, installation and long EMC shielded cables compared to panel-installed VFD solutions.

Panel-installed VFD solutions (low protection class)

This solution is intended for centralised panel installation or placement in dry environments where IP21 is sufficient. It is used for all types of converter-driven applications across industries. Compared to other solutions, centrally placed drives often have the advantage of positioning in optimal environments where the risk of damage due to moisture, corrosion, vibration, dust, etc. is limited. If there is an existing panel where the VFD can be built in, this type of VFD can be a cost effective alternative to the integrated and stand-alone drives.

ATV630 panel-installed VFD

Why is a frequency converter necessary?

A frequency converter (VFD) is an essential component in modern industry, primarily because it allows for the control of electric motor speed and torque to match the specific demands of the application it serves. This adaptability leads to significant energy savings, as motors consume only as much power as needed for the task at hand, rather than running at full capacity regardless of demand.

The ability to finely tune motor operations with a VFD not only preserves energy but also contributes to the longevity of the equipment, reducing wear and tear through smoother start-up and shutdown processes.

You can also explore our cost-effective integrated VFD motors.

Application benefits

We can offer customised complete motor and VFD solutions that add value to your applications and supply chains. VFD solutions can be used in several different applications and the benefits are many. 

Key factors to consider when selecting a frequency converter

Choosing the right VFD is crucial for ensuring efficiency, reliability, and compatibility with your specific application. Here are some key factors to consider:

  • Power range: Ensure the VFD can handle the motor's power requirements.
  • Control features: Look for VFDs that offer the control options necessary for your application, such as speed, torque, and ramp-up/down times.
  • Compatibility with existing systems: Compatibility with drives or schneider VFD systems ensures seamless integration into your current setup.
  • Environmental conditions: Consider the operating environment. VFDs should be selected based on their ability to withstand the specific conditions they will encounter, such as dust, moisture, and temperature extremes.

These considerations are vital in selecting a VFD that not only fits your immediate needs but also aligns with long-term operational goals.


  • Energy savings by reducing speed and flow in centrifugal pumps.
  • 20% flow reduction (≈ energy savings of up to approx. 50% compared to valve regulation).
  • Softer starting and stopping reduces stress and strain on pipe systems.
  • Ability to utilise pump capacity by running over-synchronous speed.
  • The integrated ATV 630 and ATV 650 pump curve function provides cost savings on flow transmitters.
  • VFD as cascade control for multiple pumps on the same pressure control systems.

Fans and ventilation

  • Energy savings by reducing speed and flow in ventilation systems.
  • Ability to utilise fan capacity by running over-synchronous speed.
  • Ability to reduce acoustic noise and resonance in the ventilation system.
  • Safety features such as safe stopping and forced safe speed for smoke extraction.
  • Easy retrofitting on existing ventilation systems.
  • Good alternative to 2-speed motors for ventilation pumps.


  • 10-15% energy saving on screw compressors compared to slide controls.
  • Longer compressor life.
  • Optimised starting and regulation of piston compressors.
  • VFD cascade control for multiple compressors.
  • Ability to utilise compressor capacity by running over-synchronous speed.


  • Energy savings by reducing speed and flow as an alternative to bypass systems.
  • Softer starting and stopping reduces stress and strain on the hydraulic system.
  • Ability to utilise system capacity by running over-synchronous speed.
  • VFD as cascade control for multiple HPUs on the same pressure control systems. 

The technical advantages of using a frequency converter

Utilising VFDs offers a multitude of technical benefits, including substantial energy savings, which directly translate to lower operational costs.

By adjusting motor speed to the actual need, energy consumption is significantly reduced, promoting a more sustainable and cost-effective operation.

Furthermore, VFDs extend the life of the machinery by reducing the mechanical stress during start and stop cycles, thus improving process control through smoother operations.

If you want to make operations more effective, you can read our guide on reducing energy consumption with electric motors.


Download Hoyer Drives & Control catalogue

As experts in electric motors, we have strategic partnerships around drives and control solutions. Read more in our catalogue.

Hoyer Smart Motor Sensors for optimal maintenance

Hoyer Smart Motor Sensors allow you to predict maintenance and avoid unplanned downtime.

Hoyer distributor network

In close cooperation with our distributors, we offer the best possible after sales solutions. Find our distributor network here. 

Contact us

Do you have any questions, or do you want to know more about our solutions within frequency converters? Contact us via below contact form.