Control methodologies for a motor control module
US7446493B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 2006 |
| Grant date | Nov 4, 2008 |
| Priority date | — |
| Expiry date | Apr 28, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K7/145
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor control module for a power tool includes a controller and a triac for controlling current to the given tool motor. The module includes a circuit within the controller for implementing a plurality of control methodologies related to synchronizing the module to the AC input signal, estimating average current flowing through the triac, compensating for amplifier offset to improve accuracy of current measurements in the module, and providing speed measurement and control for the tool motor using principles of hysteresis in a comparator of the controller. Additionally, the controller is configured to calibrate an oscillation calibration register therein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.