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. 26, 2010
Filed:
Jun. 28, 2007
Kazuaki Tobari, Hitachiota, JP;
Tsunehiro Endo, Hitachiota, JP;
Kiyoshi Sakamoto, Hitachinaka, JP;
Daisuke Maeda, Hitachi, JP;
Shigehisa Aoyagi, Hitachi, JP;
Kazuaki Tobari, Hitachiota, JP;
Tsunehiro Endo, Hitachiota, JP;
Kiyoshi Sakamoto, Hitachinaka, JP;
Daisuke Maeda, Hitachi, JP;
Shigehisa Aoyagi, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Car Engineering Co., Ltd, Ibaraki, JP;
Abstract
In a system in which current is detected in an inexpensive manner or in a system in which a position detector is omitted, the present invention provides a high-efficiency vector controller for a permanent magnet motor that can minimize current at the same torque even when there is setting error (R−R*) in resistance. Even when a current value commanded for the d-axis is set to zero, a virtual inductance value calculated from a detected q-axis current value is used for output voltage value calculation and phase error estimation calculation; so even if there is setting error (R−R*) in resistance, current can be minimized at the same torque and thereby the present invention can provide a high-efficiency vector controller for a permanent magnet motor.