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. 04, 2014
Filed:
Apr. 16, 2009
Norihisa Iwasaki, Hitachinaka, JP;
Junnosuke Nakatsugawa, Hitachi, JP;
Yoshitaka Iwaji, Hitachinaka, JP;
Norihisa Iwasaki, Hitachinaka, JP;
Junnosuke Nakatsugawa, Hitachi, JP;
Yoshitaka Iwaji, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Provided is an AC motor in a three-phase unbalanced state such as a claw-teeth type AC motor (), which is reduced in magnetic flux pulsations and torque pulsations. Among the current command values of individual phases to be intrinsically given to an inverter () for feeding three-phase alternating currents of variable voltages/frequencies to the electric motor, a current command of an intermediate phase (a V-phase) having a smaller magnetic resistance of a stator core than those of other phases is subjected to a reducing correction by a correction unit () on the basis of the correction amount calculated by a current correction amount calculating unit (), and the unbalanced three-phase alternating currents are fed to the AC motor (), so that magnetic flux pulsations of a secondary electric angle and torque pulsations of the same order are reduced.