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:
Oct. 05, 2010
Filed:
Dec. 28, 2007
Kazuaki Tobari, Hitachiota, JP;
Yoshitaka Iwaji, Hitachinaka, JP;
Kiyoshi Sakamoto, Hitachinaka, JP;
Hajime Uematsu, Narashino, JP;
Masakazu Hase, Shizuoka, JP;
Kazuaki Tobari, Hitachiota, JP;
Yoshitaka Iwaji, Hitachinaka, JP;
Kiyoshi Sakamoto, Hitachinaka, JP;
Hajime Uematsu, Narashino, JP;
Masakazu Hase, Shizuoka, JP;
Hitachi Industrial Equipment Systems Co., Ltd., Tokyo, JP;
Abstract
In a driving system for an inverter that uses a diode rectifying circuit to convert a single-phase or three-phase AC voltage to a desired DC voltage and drives a permanent magnet motor, a DC-voltage pulsating frequency is estimated from a pulsating frequency setting calculated from the power supply frequency of an AC voltage and the detected current values of the inverter, and the resulting estimated pulsating frequency value and detected current values are used to correct the output voltage of the inverter.