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. 17, 2021
Filed:
Dec. 28, 2020
Nanjing Chervon Industry Co., Ltd., Nanjing, CN;
Nanjing Chervon Industry Co., Ltd., Nanjing, CN;
Abstract
An electric tool includes a motor, a drive circuit, a power supply and a controller. The motor includes a rotor and first, second, and third phase windings. The drive circuit is electrically connected to the first, second, and third phase windings and drives the motor to output power. The power supply is electrically connected to the drive circuit and supplies power to the first, second, and third phase windings through the drive circuit. The controller is connected to the drive circuit and outputs a control signal to control the drive circuit. The controller controls the drive circuit according to a rotation position of the rotor when a voltage of the power supply is less than or equal to a preset voltage threshold so that the first, second, and third phase windings are simultaneously connected to the power supply.