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. 29, 2010
Filed:
Nov. 02, 2009
Toshiyuki Ajima, Tokai, JP;
Hideki Miyazaki, Hitachi, JP;
Masataka Sasaki, Hitachi, JP;
Bunji Furuyama, Hitachi, JP;
Tokihito Suwa, Hitachinaka, JP;
Toshiyuki Ajima, Tokai, JP;
Hideki Miyazaki, Hitachi, JP;
Masataka Sasaki, Hitachi, JP;
Bunji Furuyama, Hitachi, JP;
Tokihito Suwa, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A position detecting device which can increase accuracy in detecting the pole position of a motor used to perform quick acceleration and deceleration over the range from a zero speed to a high rotation speed, and a synchronous motor driving device using the position detecting device. A position detector detects basic-wave component signals in sensor signals and executes position calculation. A correcting unit calculates signal information representing at least one of a gain, an offset and a phase by a phase detector from the basic-wave component signals detected by an error calculator, and makes correction based on the calculated signal information such that a position detection error is zero.