Patent · US Active

Brushless motor

US8054024B2 · kind B2 · utility

12Cited by

1References

14Claims

0Family size

Assignee

NIDEC CORPORATION · JP

Inventors

Shigeo Hayashi · Tokyo, JP
Yosuke Kawano · Kyoto, JP
Satoshi Komatsu · Osaka, JP

Key dates

Filing date	Dec 4, 2008
Grant date	Nov 8, 2011
Priority date	—
Expiry date	Mar 1, 2030

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S388/923
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A brushless motor driven by a sensorless driving circuit includes a rotating body capable of being rotated about a center axis; a rotor magnet arranged coaxially with the rotating body; a stator disposed opposite the rotor magnet; and at least one coil wound around the stator. The brushless motor is driven according to a signal containing a third harmonic component relative to a fundamental wave component in an induced electromotive force. Further, an amplitude ratio of the third harmonic component to the fundamental wave component in the induced electromotive force generated in the coil preferably is about 1% or higher.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.