OVERLOAD DETECTION IN A POWER TOOL

A power tool includes a motor, a power circuit coupled to the motor, and a speed sensor coupled to the motor. The power circuit provides power to the motor. The speed sensor detects a position of the motor. The power tool also includes an electronic processor coupled to the motor and the speed senso...

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Bibliographische Detailangaben
Hauptverfasser:	Trump Brian, Selfors David H
Format:	Patent
Sprache:	eng
Schlagworte:	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 DRESSING OR CONDITIONING OF ABRADING SURFACES ELECTRICITY FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS GENERATION GRINDING HAND TOOLS MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING MANIPULATORS PERFORMING OPERATIONS POLISHING PORTABLE POWER-DRIVEN TOOLS TRANSPORTING
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Beschreibung
Zusammenfassung:	A power tool includes a motor, a power circuit coupled to the motor, and a speed sensor coupled to the motor. The power circuit provides power to the motor. The speed sensor detects a position of the motor. The power tool also includes an electronic processor coupled to the motor and the speed sensor. The electronic processor is configured to receive an output signal from the speed sensor indicative of a measured speed of the motor at a first time, determine a cumulative value based on the measured speed of the motor, and interrupt power from the power circuit to the motor when the cumulative value exceeds an accumulator threshold.