Angle grinder, power tool and braking method thereof
US10478933B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 22, 2017 |
| Grant date | Nov 19, 2019 |
| Priority date | — |
| Expiry date | May 16, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P3/16
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An angle grinder includes a motor including a rotor and windings, a power supply for supplying power to the motor, a main switch for turning on/off an electrical connection between the windings of the motor and the power supply, an output shaft driven by the rotor to rotate, a rotor brake circuit for slowing down the rotor of the motor when the windings are short circuited or reverse connected, an output shaft brake circuit for producing a magnetic field to slow down the output shaft and a controller for detecting whether the rotor brake circuit short circuits or reverse connects with the windings. When the windings are short circuited or reverse connected for a time which reaches a preset value, the output shaft brake circuit produces the magnetic field to slow down the output shaft.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.