Sensorless thermal protection for power tools
US10158301B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 2017 |
| Grant date | Dec 18, 2018 |
| Priority date | — |
| Expiry date | Feb 14, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P29/64
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A power tool is provided, including a housing; a brushless DC (BLDC) motor arranged within the housing, the motor including a stator and a rotor rotatably disposed within the stator; a power module electrically disposed between the motor and a power supply, the power module including power switches; an actuator engageable by a user; and a control module configured to control a switching operation of the power switches to begin supply power to the motor when the actuator is engaged. The control module monitors engagement and disengagement events of the actuator, and ignores a subsequent engagement of the actuator if at least one of number of actuator engagement events and/or number of actuator disengagement events exceeds a predetermined threshold value within a predetermined time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.