Power tool for performing soft-start control appropriated for motor load
US8931576B2 · kind B2 · utility
1,008Cited by
4References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 17, 2011 |
| Grant date | Jan 13, 2015 |
| Priority date | — |
| Expiry date | Apr 1, 2033 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25F5/00
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A power tool has a motor, a power supply unit, a trigger unit, a control unit, and a motor load detection unit. The power supply unit supplies power to the motor. The trigger unit causes the power supply unit to start applying a voltage to the motor. The control unit controls the power supply unit to increase the voltage to the motor at a constant increasing rate. The motor load detection unit detects a motor load. The control unit changes the constant increasing rate in accordance with the motor load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.