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Variable speed vacuum pumps

Manage your vacuum supply with an ECOTORQUE variable speed drive (VSD) from Busch.


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A variable speed vacuum pump adjusts its rotational speed to maintain a constant pressure level. Energy savings of up to 50% can be achieved.

Advantages of ECOTORQUE

Cost reduction

  • Up to 50% energy savings
  • Less maintenance and longer lifetime


  • No control cabinet needed
  • 380V – 460V, 50-60 Hz with a single drive

Efficient and economical

  • Reduced CO2 footprint
  • Productivity increase: + 20% pumping speed at 60 Hz

ECOTORQUE: Integrated or retrofit

  • r5_0630_c_vsd
    Integrated VSD

    Busch offers a wide range of vacuum pumps with integrated VSD. Adapt the pumping speed exactly to the actual requirements of your process. The result: significant energy savings.

  • r_5_ra_0630_c_vfdretrofitkit_2
    Retrofit Kits

    With our retrofit kits you can easily upgrade your existing vacuum pumps. The same significant energy savings with a smaller price tag.

    Retrofit Kits

How ECOTORQUE improves your process

In most processes, the vacuum demand varies over time. In such applications, a vacuum pump operating at a fixed speed provides the maximum pumping speed required but will continue to provide the same pumping speed when the demand decreases.

An ECOTORQUE vacuum pump adjusts its rotational speed to maintain a constant pressure level. When vacuum demand decreases, this results in reduced speed and optimized energy consumption. So why pay for a pump to operate all the time? Why not just pay for it when you need to use it? This is the right way. The Busch way.

Your VSD vacuum pumps. Connected.


Setup of examplary calculation

  • Product: Central vacuum system with one R5 RA 1000 B
  • Production time: 12 h/day (10 h/day production, 2 h/day breaks), 250 days/year
  • Electricity costs: 0.15 €/kWh

Comparing a conventional R5 RA 1000 B with a R5 RA 1000 B with VSD

Conventional R5 RA 1000 B (constant speed 60 Hz)
(variable speed 25-60 Hz)
Average absorbed power during production
22.3 kW
13.2 kW
Average absorbed power during breaks
12.5 kW
5.4 kW
Daily power consumption
248.0 kWh/day
142.5 kWh/day
105.5 kWh/day

How ECOTORQUE helps to protect the environment

105.5 kWh corresponds to 42 kg CO2 per day.

42 kg CO2 x 250 production days/year

= 10,500 KG CO2 /YEAR

A tree absorbs approximately 10 kg CO2/year

10,500 kg CO2/year / 10 kg/tree

= 1,050 TREES

This means, you would have to plant 1,050 trees to absorb the amount of CO2 which you have saved thanks to VSD.


What is a variable speed drive?

A variable speed drive (VSD) is a digital controller that regulates the rotational speed of a motor. It enables the pumping speed of a vacuum pump to be adapted exactly to the actual requirements of your process.


ECOTORQUE is the variable speed drive (VSD) from Busch. It is available both integrated into new vacuum pumps and as a Retrofit Kit to upgrade existing vacuum pumps.

What makes an ECOTORQUE variable speed drive special?

Benefit from our knowledge.

When you opt for ECOTORQUE, you don’t just get a variable speed drive. You also get our expertise and experience. We know our equipment best, so our VSDs have been designed to work perfectly with our vacuum pumps.

Like any VSD, installing ECOTORQUE is something best left to the professionals. If your vacuum pump comes with ECOTORQUE pre-installed, there’s nothing more to do. But if you would like to retrofit an existing vacuum pump, let our highly trained technicians install and fine-tune your VSD for you. That way, you ensure peak performance and the correct configuration.

Make your process even more efficient.

Our ECOTORQUE drives also come with a pre-programmed eco mode. When demand drops so much that the vacuum pump isn’t needed at all, it will go into an automatic standby mode. When demand increases again, it simply starts back up. At the exact speed that is needed.

Powerful technology. In a small package.

The ECOTORQUE VSD is installed right on top of your vacuum pump’s motor. This means that there is no need for a bulky external control unit. Saving you valuable space on your production floor.

How does the variable speed drive work?

Vacuum demand often varies within production processes. Ideally, the vacuum supply should be synchronized with demand. With a variable speed drive, vacuum pumps can be automatically adjusted to match variations in vacuum demand precisely. Reacting to fluctuations in demand makes considerable energy savings possible.

What are the different operating modes?

In scenarios with changing process parameters, we recommend vacuum pumps that can be controlled on a demand-driven basis and that either guarantee a consistent pumping speed or constantly maintain the required vacuum level.

Speed control

For processes with constant vacuum demand, it is recommended to leave the vacuum pump running at constant speed.

Pressure control

For processes with changing vacuum demand over time, the pressure control mode is the ideal choice. In this case, the vacuum pump adjusts the rotational speed according to the required vacuum level. Once this vacuum level has been achieved, the vacuum pump continues to run at minimum speed, enabling it to respond to a sudden need for increased vacuum demand and leading to further energy savings.

Is it also possible to retrofit existing vacuum pumps?

Busch offers a wide range of vacuum pumps with integrated VSD. However, with our Retrofit Kits you can easily upgrade your existing vacuum pumps.

What is the difference between a variable speed drive (VSD) and a variable frequency drive (VFD) vacuum pump?

There is no difference. They are just two terms for the same thing. VSD describes the result: the different rotational speeds of the vacuum pump. VFD, on the other hand, stands for the cause of the different speeds, namely the variable frequency.