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. 09, 2019
Filed:
Feb. 26, 2018
Nanjing Chervon Industry Co., Ltd., Nanjing, CN;
Chervon (Hk) Limited, Wanchai, HK;
Shibo Chen, Nanjing, CN;
Hongwei Wang, Nanjing, CN;
Abstract
An electric power tool and a method for driving a brushless motor in the electric power tool. The electric power tool includes a driving circuit for driving the brushless motor and position sensors (D, D, D) for detecting positions of the rotor. The rotor of the brushless motor, when rotating in a normal direction, sequentially passes by a commutation position, where a signal of at least one of the position sensors (D, D, D) in the brushless motor changes, and a reference position, where a back electromotive force of the stator winding of at least one phase in the brushless motor is at a midpoint position of the waveform of the back electromotive force. An electrical angle between the commutation position and the reference position ranges from 20° to 40°. The position sensors (D, D, D) are configured such that performance of the brushless motor is improved.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile