Energy consumption of milking pump controlled by frequency convertor during milking cycle
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Kuupäev
2018
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Ajakirja pealkiri
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Abstrakt
The article deals with selected parameters affecting the energy consumption of a
vacuum pump in a milking system during the whole milking cycle in variants with and without
regulation by a frequency convertor. When put into practice, the latest research of creation,
control and stabilization of vacuum in milking devices allows dairy farmers to obtain a vacuum
system that ensures maximum stability of milking pressure, which is a basic requirement affecting
the health of dairy cows. The choice of vacuum system prioritizes in particular high performance,
maximum operational reliability, minimum maintenance, long service life, environmental
friendliness and economy. The vacuum pump was a Roots vacuum pump with a rotary piston
which is typical for this use. Use of a frequency convertor significantly affected the efficiency of
this pump for control of vacuum pressure level and pump performance by varying the rotation
frequency according to the actual airflow requirement. Using this control system, only as much
vacuum pressure is produced as necessary. By measurement of an experimental setup, it was
found that the average power requirement of a setup with a control valve was 3.8 kW compared
to 1.7 kW in the case of the variant with frequency convertor. Measurements and calculations
have shown that this system is capable of saving more than 50% of electric energy.
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Märksõnad
milking cycle, vacuum system, vacuum pump, frequency convertor, energy consumption, articles