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:
Jul. 05, 2005
Filed:
Aug. 10, 2001
Takefumi Sawada, Tokyo, JP;
Satoru Kaneko, Tokyo, JP;
Ryoso Masaki, Tokyo, JP;
Mitsuyuki Hombu, Tokyo, JP;
Hiroshi Katayama, Tokyo, JP;
Takefumi Sawada, Tokyo, JP;
Satoru Kaneko, Tokyo, JP;
Ryoso Masaki, Tokyo, JP;
Mitsuyuki Hombu, Tokyo, JP;
Hiroshi Katayama, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A synchronous motor controlling apparatus which can be applied to the carrier synchronized position estimating method as well and have protection-related functions such as detection of inverted magnetic pole position of a motor in a simple method, and an electric motor using the synchronous motor control apparatus. A controller controls a voltage applied to an AC motor with a PWM signal. A magnetic pole position detector of the controller detects a current of the AC motor to estimate a pole position of the AC motor. A fault detector detects a fault in the estimated magnetic position of the AC motor.