Constant-clutch operation at power tool start-up
US12266918B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 2022 |
| Grant date | Apr 1, 2025 |
| Priority date | — |
| Expiry date | Jan 9, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P29/024
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of operating a power tool having a motor and a controller is provided. The method includes: setting a protection time limit associated with a condition of the motor; taking protective action to shut down the motor if the condition of the motor persists for a duration of the protection time limit; and in response to occurrence of the condition during a start-up period of operation of the motor, extending the protection time limit for a duration of a constant-clutch time period to allow an output speed of the motor to reach or exceed a speed threshold, and taking protective action to shut down the motor if the output speed of the motor remains below the speed threshold for the duration of the constant-clutch time period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.