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Energetic consideration of the drive concepts

Especially in recent months, it has become more and more pain- Looking at all these concepts, the E-AHP emerges from this
fully aware that energy has become “precious” in the truest analysis as the undisputed winner.
sense of the word. It is therefore very worthwhile to look at
drive concepts from the energy side as well. There are hardly any valves and piping due to the direct control
via the motor and the internal gear pump with servo motor
This is exactly what we wanted to know in more detail, and to does the rest. The result is that you have to use about 2% more
this end we carried out an internal analysis. The analysis was energy than you really need for the application. This means that
structured in such a way that we calculated how much energy our E-AHP units work with an efficiency between 95% and
must be expended in addition to the energy actually used in the 99%! If you compare the hydraulics of the constant pump, you
application (useful power), i.e. how much loss is generated in are at a power loss of 270% and more.
the system.
Now it very much depends on the application. If it is an applica-
In a hydraulic system, there are losses at various points: tion that is only operated for a few hours a day, the additional
First in the drive motor itself. Here, there are differences simply price for the more energy-efficient solution may not pay off. As,
because of whether it is a pure electric motor or a servo motor. for example, in the test aggregate mentioned at the beginning.
A servomotor is incomparably more efficient, although it is also We see it as our task to develop and design the exact customer
significantly more expensive. application together with our customers.

The next loss takes place in the hydraulic pump. Here there are And in terms of energy, we do not stop at the hydraulic sys-
significant differences, for example, whether you use an inter- tems. Because, as already mentioned, hydraulics in itself is not
nal gear, external gear, piston or variable displacement pump. the worst solution. If we consider hydropneumatic drives, for
Here, too, the price often has a not inconsiderable influence example, the hydraulics with constant pump suddenly look ex-
on efficiency. However, the greatest power loss is generated in tremely good again...
the piping and valves. Especially if you control the position via
(proportional) valves, you generate enormous losses.

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