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. 11, 2023
Filed:
Oct. 22, 2019
Nanjing Chervon Industry Co., Ltd., Nanjing, CN;
Lianghua Ni, Nanjing, CN;
Baofeng Fan, Nanjing, CN;
Nanjing Chervon Industry Co., Ltd., Nanjing, CN;
Abstract
A rotary impact tool includes an impact assembly, a brushless motor, a transmission assembly, a drive circuitry, and a controller. The controller is configured to acquire a commutation interval of the brushless motor, output a first control signal to the drive circuitry causing the brushless motor to operate at a preset initial speed, and output a second control signal to the drive circuitry to gradually increase a rotational speed of the brushless motor to a preset final speed, when a commutation interval of the brushless motor becomes greater than or equal to a preset time threshold, where the preset initial speed is less than the preset final speed.