Rotation control device, rotation control method and...

Electricity: motive power systems – Positional servo systems – With particular 'error-detecting' means

Reexamination Certificate

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C318S638000, C318S639000, C318S799000, C318S461000, C318S798000, C318S823000

Reexamination Certificate

active

11596208

ABSTRACT:
In an electric rotary excavator (construction machine)1, when earth pressure acts on a rotary body4in an opposite direction to an instructed direction of a lever, a control-system changing means150of a rotation control device100increases a torque output of an electric motor5that drives the rotary body4. Accordingly, the torque output can properly react against the acting earth pressure, thereby preventing the rotary body from continuing to be rotated in the opposite direction. Therefore, even when the earth pressure becomes large, the work will not be affected. In addition, when the rotary body is rotated on a slope, the rotary body can be prevented from being rotated back greatly due to the weights of the boom and the arm.

REFERENCES:
patent: 5835874 (1998-11-01), Hirata et al.
patent: 2005/0253542 (2005-11-01), Sugano et al.
patent: 2006/0099081 (2006-05-01), Toda et al.
patent: 11-269937 (1999-10-01), None
patent: 2001-11897 (2001-01-01), None
patent: 2003-328398 (2003-11-01), None
patent: 2004-36303 (2004-02-01), None

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