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:
Mar. 25, 2008
Filed:
Aug. 25, 2003
Kozo Ide, Fukuoka, JP;
Mitsujiro Sawamura, Fukuoka, JP;
Toshihiro Sawa, Fukuoka, JP;
Jun Oyama, Nagasaki, JP;
Kozo Ide, Fukuoka, JP;
Mitsujiro Sawamura, Fukuoka, JP;
Toshihiro Sawa, Fukuoka, JP;
Jun Oyama, Nagasaki, JP;
Kabushiki Kaisha Yaskawa Denki, Fukuoka, JP;
Abstract
A control device is provided for a synchronous motor, which drives the synchronous motor through a voltage operated PWM inverter and controls a torque and a speed of the motor, including a unit for causing a PWM carrier signal to have an arbitrary phase difference between two phases such UV, VW, or WU in three phases of U, V, and W, a unit for extracting a high frequency voltage and a high frequency current, which are thus generated from a detecting voltage or a command voltage and a detecting current, and a unit for estimating a position of a magnetic flux or position of a magnetic pole by using the high frequency voltage and the high frequency current which are excited.