Electric tool and control method of electric tool
US11095238B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 2020 |
| Grant date | Aug 17, 2021 |
| Priority date | — |
| Expiry date | Dec 28, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P2203/03
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.