Electric power tool, lock state occurrence determination apparatus, and program
US8890449B2 · kind B2 · utility
56Cited by
1References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 26, 2011 |
| Grant date | Nov 18, 2014 |
| Priority date | — |
| Expiry date | Dec 21, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P29/0241
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lock state occurrence determination apparatus includes a counter, a reset device, a reference time changing device, a lock state determination device, and an invalidation device. The invalidation device performs, in a case where a false determination of occurrence of a lock state of a motor is caused by the lock state determination device due to an operation input to operate a rotation speed of the motor, at least one of a first invalidation operation to invalidate the lock state determination device and a second invalidation operation to invalidate continuation of a counting operation by the counter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.