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Hydraulic units include several devices, such as oil tanks, displacement pumps, directional valves, retention valves and actuators. They are arranged in logic circuits to enable the movement and control of a certain machine by means of fluid displacement, performed by one or more sets of electric motors and hydraulic pumps.
Due to their simple operation, hydraulic drives are used in many different applications, such as presses, thermoforming machines, truck dumpers, injection molding machines and calenders.
It is worth of notice that in this kind of application, when no movement is needed, both the hydraulic pump and the electric motor keep running at rated speed with the hydraulic fluid circulating, resulting in waste of electric energy and unnecessary oil heating. On the other hand, turning off the electric motor may cause damages such as the equipment burn out due to successive starts and excessive mechanical wear of the oil pump.
La solución WEG de eficiencia energética para unidades hidráulicas permite que el motor y la bomba ajusten la rotación conforme la real necesidad de la máquina, resultando en ahorro de energía en los momentos donde en el conjunto solamente recircula el fluido hidráulico, debido a la característica del proceso (ejemplo: cambio de pieza a ser estampada en una prensa o entrada/ salida de camión en una volqueta de camión).