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:
Sep. 10, 2013
Filed:
Jan. 23, 2013
Satoshi Ibori, Yachimata, JP;
Yoshihiro Uchino, Yachiyo, JP;
Hiroshi Watanabe, Sakura, JP;
Masahiro Hiraga, Yotsukaido, JP;
Satoshi Ibori, Yachimata, JP;
Yoshihiro Uchino, Yachiyo, JP;
Hiroshi Watanabe, Sakura, JP;
Masahiro Hiraga, Yotsukaido, JP;
Hitachi Industrial Equipment Systems Co., Ltd, Tokyo, JP;
Abstract
The performance of a power transducer is improved while efficiently using a power semiconductor also by managing the permissible duty factor of the power semiconductor in the regenerative braking circuit provided in the power transducer. The user is allowed to set, through an operation panel provided on the power transducer, the resistance value of the regenerative braking resistor for thermally consuming the rotational energy generated during motor deceleration. The power transducer performs the steps of: calculating the current which flows in the regenerative braking circuit from the resistance value setting; obtaining the generation loss of the power semiconductor in the regenerative braking circuit with the calculated current value; and determining the permissible duty factor of the power semiconductor from the obtained generation loss.