Maximum performance in continuous use.

Higher frequency, constant speeds, higher performance. The superior tool concept of FEIN high-frequency power tools makes them particularly well suited to use in metalwork, for heavy-duty grinding and continuous use when roughing-down or cutting under the toughest working conditions.

  • Thanks to design-related measures like induction motors and the fact that wearing power-transmitting parts are not used, FEIN high-frequency power tools satisfy very high robustness andservice life requirements.
  • They have power reserves, on average a good 100 % higher than normal.
  • In everyday use, this translates into constant speed across the entire load range. For efficient working with a high grinding performance and lower levels of disc wear.
  • The FEIN high-frequency range includes a wide selection of angle grinders and straight grinders for tradespeople and professional users in industry.
    FEIN high-frequency power tools can also be used as portable devices on the construction site or on stationary grinding stations.

Speed (%) Output power (%)

Comparison of characteristic curves depending on the power of different tool types.:

Pneumatic system

Standard frequency

High frequency

High-frequency cost-effective working.

In terms of investment, energy and maintenance costs, high-frequency power tools are much more cost-effective than comparable standard-frequency or pneumatic tools. The sample calculations below show a comparison of the systems.

High frequency compared with standard frequency.

A higher frequency means a higher speed which increases the motor’s output power. Increasing the frequency from 50 Hz to 300 Hz therefore increasing power sixfold while retaining the same size and weight. The optimum power/weight ratio is reached at 300 Hz. Outstanding speed stability over the entire load range ensures optimum peripheral speeds which impacts positively on grinding performance, productivity and an appreciable reduction in grinding disc wear.
The induction motors of the high-frequency power tools with squirrel cage rotors feature no wearing power-transmitting parts. They don’t need powerful ventilation, just surface ventilation, which allows them to be fully encapsulated and gives the motors complete dust protection. High-frequency tools have simple structures, making them easy, fast and cheap to maintain. Stationary frequency converters require virtually no service – with the exception of ball bearing maintenance (roughly every 20,000 operating hours).

Procurement costs
Grinding disc costs
labour costs
maintenance costs
Σ 1st year

Standard frequency

High frequency

The comparison was based on the following basic conditions:

  • 1 grinder workstation
  • 250 working days per year, two-shift operation, 8-hour shifts
  • 50% tool use, i.e. 8 hours a day or 2,000 hours a year
  • 3 standard-frequency angle grinders (WSG 25-180) per year
  • 1 high-frequency angle grinder (MSfo 869-1d) for 2 years + 1 converter (HFS 27-300) for > 5 years

High frequency compared with pneumatic system.

The power distribution system for high-frequency power tools has virtually no energy losses, while with pneumatic systems the heat produced when compressing air results in greater energy losses. In reality, an additional 10 to 20 % more energy is needed due to leaks – if the systems are poorly maintained, this figure may even rise to 30% and above. The performance of the pneumatic motors also depends on the condition of their components, which are subject to wear (for example, cylinder, rotor, thrust washers, flaps). This translates into continuous performance losses which in turn results in falling efficiency and rising energy consumption. Highfrequency power tools on the other hand continue to perform with full power after many hours of work: the performance of the robust induction motors remains constant at all times – regardless of wear.

energy costs
investment costs
maintenance costs
grinding disc consumption
material removal

Pneumatic system

High frequency

The comparison was based on the following basic conditions:

  • 15 grinding workstations
  • 250 working days/year, two-shift operation, 8-hour shifts
  • 60% tool use, i.e. 9.6 hours a day or 2,400 hours a year
The FEIN high-frequency range

FEIN high frequency benefits compared with standard frequency:

  • 50% less grinding disc consumption
  • labour costs for a defined job (increased material removal = greater productivity)
  • 75% lower maintenance costs
  • 32% lower overall costs

The cost of purchasing a FEIN high-frequency tool with single-station converter will be paid off in just one year.

FEIN high frequency benefits compared with pneumatic system:

  • 90% lower energy costs
  • 70% lower investment costs
  • 75% lower maintenance costs
  • 50% less grinding disc consumption
  • 10% more material removal, i.e. greater work productivity

Investing in a high-frequency system from FEIN will pay off very quickly.