ELECTRICALLY POWERED TOOL

Provided is an electrically powered tool with which it is possible to suppress the effect of a fluctuation in power supply voltage on load discrimination accuracy. An electrically powered tool (1) includes a motor (10), a battery pack (5) supplying electric power to the motor (10), a battery voltage...

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Bibliographische Detailangaben
Hauptverfasser:	KAWANO, Yoshikazu, SUDO, Tomoaki
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDEDFOR DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOTPARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOTOTHERWISE PROVIDED FOR HAND TOOLS MANIPULATORS PERFORMING OPERATIONS PORTABLE POWER-DRIVEN TOOLS TRANSPORTING
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Beschreibung
Zusammenfassung:	Provided is an electrically powered tool with which it is possible to suppress the effect of a fluctuation in power supply voltage on load discrimination accuracy. An electrically powered tool (1) includes a motor (10), a battery pack (5) supplying electric power to the motor (10), a battery voltage detection circuit (17) detecting battery voltage, a current detection circuit (15) detecting current flowing through the motor (10), and a microcomputer (20) controlling driving of the motor (10). The microcomputer (20) discriminates a load state of the motor (10) according to whether or not the current flowing through the motor (10) is equal to or greater than a threshold value, and the microcomputer (20) can change the threshold value in accordance with the battery voltage. When the current flowing through the motor (10) remains below the threshold value for a predetermined period of time, the microcomputer (20) stops the supply of electric power to the motor (10).