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. 23, 2010
Filed:
Jan. 25, 2008
Daisuke Maeda, Hitachi, JP;
Tsunehiro Endo, Hitachiota, JP;
Hidefumi Shirahama, Hitachi, JP;
Kenji Sakurai, Hitachi, JP;
Hiroyuki Hasegawa, Hitachi, JP;
Mitsuhiro Mishima, Tokai, JP;
Daisuke Maeda, Hitachi, JP;
Tsunehiro Endo, Hitachiota, JP;
Hidefumi Shirahama, Hitachi, JP;
Kenji Sakurai, Hitachi, JP;
Hiroyuki Hasegawa, Hitachi, JP;
Mitsuhiro Mishima, Tokai, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Information & Control Solutions, Ltd., Ibaraki, JP;
Abstract
The synchronous motor driving apparatus including position sensors provided in the synchronous motor, a current polarity detection circuit for detecting the polarities of the currents in the respective phase windings of the synchronous motor, an inverter driving the synchronous motor, a motor speed calculation unit calculating the rotational speed of the synchronous motor depending on the output signals from the position sensors, a speed control unit outputting a first voltage adjusting component (q-axis current command value Iq*) to cause the rotational speed of the synchronous motor to approach a speed command value and a phase control unit outputting a second voltage adjusting component (d-axis current command value Id*) to cause the phase differences between the phases of the position sensor signals and of the currents in the respective phase windings of the synchronous motor to become a predetermined value.