Method for controlling electric motor by trigger
US9726729B2 · kind B2 · utility
1Cited by
1References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 4, 2016 |
| Grant date | Aug 8, 2017 |
| Priority date | — |
| Expiry date | Apr 4, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P1/18
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An example method for controlling an electric motor in an electric tool includes detecting travel of the trigger, selecting a smoothing coefficient N according to travel of the trigger in a predetermined time, driving the electric motor with an output duty ratio which is figured out by a formula in which the smoothing coefficient N is a denominator so as to cause the output duty ratio to be lesser than a preset duty ratio. The methods described will decrease the current impact on electric motors when users pull the trigger.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.