Method and apparatus for operating a hydraulic drive

Details Method and apparatus for operating a hydraulic drive Method and apparatus for operating a hydraulic drive

1997-05-16

1998-12-08

Nguyen, Hoang

Power plants

Pressure fluid source and motor

Methods of operation

60432, F16D 3100

Patent

active

058454934

ABSTRACT:
The drive includes a reversible variable output pump (1), which supplies a hydraulic working machine (6) and is driven by an asynchronous motor (2). The working machine is intermittently hydraulically pressurized. During these times the asynchronous motor can be switched off since the subsequent start-up process, which causes a high current consumption in the case of asynchronous motors, is effected by the variable output pump. Before the beginning of the start-up process the variable output pump is preset to the maximum negative discharge rate by its proportional valve (10) being acted on by a control pressure. The volume pressurized in the working machine is then applied to the output side of the variable output pump. The asynchronous motor is connected to the current supply network after reaching a minimum speed.

REFERENCES:
patent: 3505814 (1970-04-01), Beard et al.
patent: 5469946 (1995-11-01), Nguyen
patent: 5680761 (1997-10-01), Hada et al.

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