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-...

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Bibliographic Details
Main Authors FORSTER, MICHAEL K, GORTI, BHANUPRASAD V, MCCORMICK, GARRETT P, ALBERT, LARRY T, WOODS, SAMUEL G, LEH, JASON K, VANKO, JOHN C, BEERS, DAVID
Format Patent
LanguageEnglish
French
German
Published 06.04.2016
Subjects
COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDEDFOR
CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS
CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOTPARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOTOTHERWISE PROVIDED FOR
ELECTRICITY
GENERATION
HAND TOOLS
MANIPULATORS
PERFORMING OPERATIONS
PORTABLE POWER-DRIVEN TOOLS
TRANSPORTING
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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