The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 26, 2013
Filed:
Feb. 28, 2011
Masayuki Komiyama, Hiroshima, JP;
Natsuki Yumoto, Hiroshima, JP;
Yoshiyasu Umezu, Hiroshima, JP;
Masayuki Kogashima, Hiroshima, JP;
Masayuki Komiyama, Hiroshima, JP;
Natsuki Yumoto, Hiroshima, JP;
Yoshiyasu Umezu, Hiroshima, JP;
Masayuki Kogashima, Hiroshima, JP;
Kobelco Construction Machinery Co., Ltd., Hiroshima-shi, JP;
Abstract
There is provided a slewing control device that enables to detect breakdown of a driving system of a mechanical brake, and generate a torque for holding a slewing body in a stopped state to thereby prevent movement of the slewing body when an anomaly has occurred. In a working machine for driving a slewing body by an electric motor, judgment is made as to whether a mechanical brakeis in an inconsistent state, based on a command to be outputted to a brake circuit B, and a pressure detected by a brake pressure sensor. The inconsistent state is a state that the mechanical brakeis in a brake released state when an activation command for switching the mechanical braketo a brake activated state is outputted. If it is judged that the mechanical brakeis in the inconsistent state, a command for obtaining a braking torque for holding the slewing body in a stopped state is outputted to the electric motor