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:
Nov. 17, 2009
Filed:
Jul. 28, 2006
Takahiro Suzuki, Tokai, JP;
Tsunehiro Endo, Hitachiota, JP;
Kazuaki Tobari, Hitachiota, JP;
Daigo Kaneko, Hitachi, JP;
Daisuke Maeda, Hitachi, JP;
Akira Yamazaki, Hitachi, JP;
Takahiro Suzuki, Tokai, JP;
Tsunehiro Endo, Hitachiota, JP;
Kazuaki Tobari, Hitachiota, JP;
Daigo Kaneko, Hitachi, JP;
Daisuke Maeda, Hitachi, JP;
Akira Yamazaki, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Industrial Equipment Systems, Co., Ltd., Tokyo, JP;
Hitachi Car Engineering Co., Ltd., Ibaraki-ken, JP;
Abstract
A motor controller capable of suppressing a large speed change generated at the time of changeover from a synchronous operation mode to a position feedback operation mode and implementing even acceleration characteristics regardless of the load torque by estimating a torque of a permanent magnet motor in the synchronous operation mode for driving the permanent magnet motor and setting an initial value of a current command value in a position sensor-less operation mode on the basis of information of the torque estimated value.