Protective redundant subsystem for power tools
A power tool configured to receive an alternating current (AC) input signal, comprising of an electric motor (14), a phase-controlled switch coupled in series with the motor (14), a motor control module (18) interfaced with the phase-controlled switch and modulates the conductive state of the phase-...
Saved in:
Main Authors | , , , , , , , |
---|---|
Format | Patent |
Language | English French German |
Published |
08.10.2014
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | A power tool configured to receive an alternating current (AC) input signal, comprising of an electric motor (14), a phase-controlled switch coupled in series with the motor (14), a motor control module (18) interfaced with the phase-controlled switch and modulates the conductive state of the phase-controlled switch at a given phase of the AC input signal, and an overspeed detection module (22) configured to receive the given phase from the motor control module (18) and measure current through the motor (14), the overspeed detection module (22) operable to determine rotational speed of the motor (14) as a function of the given phase and the measured current and to disable the power tool when the rotational speed of the motor (14) exceeds a threshold. |
---|---|
Bibliography: | Application Number: EP20100175308 |