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Frequency inverters –
energy recovery offers additional
improvement in efficiency with
reduced space requirements and costs


Today, the potentials to increase energy efficiency in the industry and especially in electrical drives technology are well-known to a large circle of users, but there is still a much to be done in practice.

According to field surveys about 12 percent of the motor capacity installed in the German industry is operated with energy-saving electronic speed controllers – this with a potential portion of about 50 percent! But even this 12 percent does not tap the available potential fully.

Studies by the drive specialist KIMO have shown that in applications with frequent drive switching there is still great potential for saving energy and costs. Even today, braking often means a waste of energy! Regenerative feedback is an alternative.

Fig. 1: Improvement in efficiency with space/cost savings in practice

Frequency inverters of the TRANSOMIK U2-family

For these applications KIMO has developed the compact, fully regenerative frequency inverter family TRANSOMIK U2 which is available with a rated power within the range 4 to 200 kW.

Apart from the improvement of the energy efficiency by regenerating the braking energy, the functional principle of this frequency inverter family provides further capabilities to increase the efficiency. These result from the compact and complete design of the units.

On the one hand, there are no additional costs for optional, but necessary additional components. On the other hand, substantial savings can be achieved by minimizing follow-up costs. For example the planning and enclosure costs are minimized as the inverter requires little space, fewer additional components and the heat-loss of the inverter are low.


Compact and complete

  • No additional input or output filters required, chokes are already integrated
  • Full regeneration of the braking energy into the electrical supply, braking-choppers or brake resistors are not required
  • Low dissipated heat


Environmental friendly with a long service life

  • Operation without electrolytic capacitors in the d.c. link result in long service life of the frequency inverter
  • Low supply harmonics / compliance with EN 61000-3-12


Other features

  • Fast input and output switching, highly dynamic
  • Compatible with earth-leakage circuit breakers
  • Low bearing currents


Fig 2: Frequency inverter TRANSOMIK U2 (factory photo KIMO)


KIMO Industrial Electronics GmbH
Am Weichselgarten 19, 91058 Erlangen, Germany
Tel.:+49 9131-6069-0  Fax.:+49 9131-6069-35
© 2003- 2019 KIMO Industrial Electronics GmbH, www.kimo.de

New Kid in Town:

The new LEKTROMIK DS1 is forthcoming - a combined soft-start and braking device!
Microprocessor controlled.
Fully controlled - ideal for IE3 motors.
High braking torque.
Integrated standstill detection.
Compact design.
Up to 15 kW rated motor power.
Suitable e.g. for woodworking machines.

Available 3rd quarter of 2019.

read more ...
(only german yet)

MINT - Promoting Young Talents
Also in 2019 KIMO supports a visit of pupils from the Kaiser-Heinrich-High School in Bamberg to the Hannover International fair. The students will participate in a guided tour through the exhibition, organized by the my-eFuture-initiative, and they will experience hands-on technology. Our special thanks goes to the enablers of the ZVEI and the my-eFuture-initiative!