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. 24, 2012
Filed:
Oct. 12, 2007
Masayuki Okubo, Kiryu, JP;
Masayuki Okubo, Kiryu, JP;
MITSUBA Corporation, Gunma, JP;
Abstract
In a brushless motor having a stator including armature windings for a plurality of phases, and a rotor including a permanent magnet and being rotatably disposed inside or outside of the stator, an inter-phase induced voltage waveform between two different phases in the armature windings is a trapezoidal waveform formed by superimposing a fifth-order component and a seventh-order component on a first-order fundamental wave. A content rate X(=(α+α)/α) of a total of voltage peak values α5 and α7 of the fifth-order component and the seventh-order component to a voltage peak value αof the first-order fundamental wave is preferably set to a range of 0.01≦X≦0.1, and more preferably to a range of 0.02≦X≦0.09.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile