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:
Apr. 18, 2006
Filed:
Feb. 27, 2004
Daigo Kaneko, Hitachi, JP;
Yoshitaka Iwaji, Hitachinaka, JP;
Kiyoshi Sakamoto, Hitachi, JP;
Tsunehiro Endo, Hitachiota, JP;
Tomofumi Okubo, Narashino, JP;
Daigo Kaneko, Hitachi, JP;
Yoshitaka Iwaji, Hitachinaka, JP;
Kiyoshi Sakamoto, Hitachi, JP;
Tsunehiro Endo, Hitachiota, JP;
Tomofumi Okubo, Narashino, JP;
Hitachi Industrial Equipment Systems Co., Ltd., Chiba, JP;
Abstract
An AC motor control apparatus that is applicable to commonly used PM motors and capable of detecting the magnetic pole position with simple algorithm. The AC motor control apparatus comprises an inverter for applying arbitrary AC power to an AC motor and a controller for sending a control signal to the inverter. The controller comprises a ripple current generator for supplying a ripple current to the AC motor and a magnetic pole position estimator. The magnetic pole position estimator observes at least two current values of the ripple current for both positive and negative sides of the ripple current to estimate the magnetic pole position of the AC motor.