Sensorless motor control for a power tool
US12358115B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 4, 2023 |
| Grant date | Jul 15, 2025 |
| Priority date | — |
| Expiry date | Dec 4, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P2203/03
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for automatic control switching for driving a sensorless motor of a power tool, the method including generating, using a signal generator, a high-frequency injection signal. The method includes coupling, using a coupling circuit, the high-frequency injection signal to an injection coil of the sensorless motor. The method includes decoupling, using a de-coupling circuit, a response to the high-frequency injection signal from a phase coil of the sensorless motor. The method includes determine a sensorless motor condition based upon the response of the injection coil to the high-frequency injection signal. The method includes driving, using a controller of the power tool, the sensorless motor based upon the sensorless motor condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.