Control scheme for power tool having a brushless motor
US11418088B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 2020 |
| Grant date | Aug 16, 2022 |
| Priority date | — |
| Expiry date | Aug 27, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P2205/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A power tool is provided including a housing, an electric motor disposed within the housing, a power switch circuit disposed between a power supply and the electric motor, a main controller, and a secondary controller. The main controller is arranged to control a switching operation of the power switch circuit to regulate a speed of the motor, and is configured to monitor at least one of a speed or a rotational direction of the electric motor and deactivate the power switch circuit upon detection of fault condition associated the speed or the rotational direction of the electric motor. The secondary controller is configured to monitor at least one of the speed or the rotational direction of the electric motor independently from the main controller and deactivate the power switch circuit upon detection of fault condition associated the speed or the rotational direction of the electric motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.