Microprocessor for controlling the speed and frequency of a motor shaft in a power tool
US6696814B2 · kind B2 · utility
1,025Cited by
5References
41Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 9, 2001 |
| Grant date | Feb 24, 2004 |
| Priority date | — |
| Expiry date | Jan 17, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H7/0858
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A control system for driving a power tool is provided comprising a power source, a motor adapted to drive a shaft, a power switching unit interconnecting the power source and the motor, and a controller. The power switching unit applying a pulse width modulated (PWM) drive signal from the power source to the motor. The controller monitoring at least one electrical characteristic of at least one of the power source, motor and power switching unit and adjusting the operating duty cycle of the PWM drive signal based on the electrical characteristics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.