Electric power tool, control unit and recording medium
US8179069B2 · kind B2 · utility
66Cited by
9References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 13, 2008 |
| Grant date | May 15, 2012 |
| Priority date | — |
| Expiry date | Sep 17, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/08
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric power tool includes a direct current motor, at least one switching device, a trigger switch, a control unit, and a drive unit. The control unit sets a driving duty ratio for PWM controlling the direct current motor so as to increase the driving duty ratio in a stepwise manner in accordance with an operation continuation time of the trigger switch during a period from when an operation of the trigger switch is started until when a predetermined start-up time has elapsed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.