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:
Jun. 17, 2008
Filed:
Aug. 17, 2005
Kazuaki Tobari, Hitachiota, JP;
Kiyoshi Sakamoto, Hitachi, JP;
Tsunehiro Endo, Hitachiota, JP;
Yoshitaka Iwaji, Hitachinaka, JP;
Yukio Kawabata, Hitachinaka, JP;
Shigehisa Aoyagi, Hitachi, JP;
Kazuaki Tobari, Hitachiota, JP;
Kiyoshi Sakamoto, Hitachi, JP;
Tsunehiro Endo, Hitachiota, JP;
Yoshitaka Iwaji, Hitachinaka, JP;
Yukio Kawabata, Hitachinaka, JP;
Shigehisa Aoyagi, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A vector control system for a permanent magnet synchronous motor, using a current control equivalent output value, a frequency instruction value, a current detection value, an inference phase error value, and a motor constant, identifies a motor resistance equivalent or a resistance setting error equivalent. Next, the vector control unit, using the identified value, corrects a set value R* equivalent of a voltage instruction calculation unit and a n inference phase error calculation unit. Thereby, a vector control system for a permanent magnet synchronous motor can realize a robust control characteristic for changing of a resistance constant of a motor in a low rotation speed area under position sensor-less control. Further, a vector control system for a permanent magnet synchronous motor can be applied in common in a system performing inexpensive current detection.