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:
Aug. 15, 2017
Filed:
Apr. 19, 2017
Mitsuba Corporation, Gunma, JP;
Masaaki Kimura, Gunma, JP;
Hiroto Tanaka, Gunma, JP;
Tamotsu Iwazaki, Gunma, JP;
Tomohiko Annaka, Gunma, JP;
Naoki Kojima, Gunma, JP;
Junya Kitazawa, Gunma, JP;
Mitsuba Corporation, Kiryu-shi, Gunma, JP;
Abstract
A brushless motor comprises: a statorhaving armature coils, and; a rotorwhich is rotated by a revolving magnetic field; and a switching element, wherein the brushless motor has a rotation number control unitwhich switches between low-speed and high-speed mode, wherein in the low-speed mode, the rotation number control unitsupplies current to the armature coils, andat predetermined energization timing and controls a duty ratio to control the rotation number of the rotor, and in the high-speed mode, the rotation number control unitsupplies current to the armature coils, andat energization timing advanced from the energization timing for the low-speed mode, thereby performing field weakening control of weakening the revolving magnetic field from that of the low-speed mode to control the rotation number of the rotor