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:
Oct. 24, 2006
Filed:
May. 19, 2004
Keiji Sakamoto, Hachioji, JP;
Hisashi Maeda, Yamanashi, JP;
Keiji Sakamoto, Hachioji, JP;
Hisashi Maeda, Yamanashi, JP;
Fanuc Ltd, Yamanashi, JP;
Abstract
Windings of each phase in a three-phase AC motor are independent of one another. A motor control unit gives, to windings of each phase (U, V and W-phase), currents (IU, IV, IW) obtained by adding, to a fundamental sine wave current, a current having a frequency which is three times as high as that of the fundamental sine wave current. That is,·sin ω·sin 3ω·sin(ω+2/3π)+·sin 3ω·sin(ω+4/3π)+·sin 3ωAlso, amplitude Ia of a current having a frequency which is three times as high as that of the fundamental sine wave current is set to a predetermined value smaller than amplitude I of the fundamental sine wave current.