Automatic ramp load sense for power tools
US11919135B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 2021 |
| Grant date | Mar 5, 2024 |
| Priority date | — |
| Expiry date | Nov 3, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P29/40
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Power tools described herein include a tool output, a motor driving the tool output, a battery pack interface, a power switching network coupled between the battery pack interface and the motor, and a controller coupled to the power switching network to control operation of the motor. The controller is configured to operate the motor at a no-load speed at startup and detect a load state of the power tool. The load state indicates whether the power tool is in a loaded state or an unloaded state. The controller is also configured to incrementally ramp up a speed of the motor from the no-load speed to a selected speed when the power tool is in the loaded state and incrementally ramp down the speed of the motor from the selected speed to the no-load speed when the power tool is in the unloaded state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.