Reverse rotation detection and overspeed protection for power tool with brushless motor

An overspeed protection module is provided for a handheld power tool having an electric motor intended to rotate in a first direction but not an opposite second direction. The overspeed protection module is comprised of: an electric motor; a switching arrangement having a plurality of motor switches...

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Bibliographische Detailangaben
1. Verfasser:	VANKO, JOHN C
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS CONVERSION OR DISTRIBUTION OF ELECTRIC POWER DRESSING OR CONDITIONING OF ABRADING SURFACES ELECTRICITY FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS GENERATION GRINDING MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING PERFORMING OPERATIONS POLISHING TRANSPORTING
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Beschreibung
Zusammenfassung:	An overspeed protection module is provided for a handheld power tool having an electric motor intended to rotate in a first direction but not an opposite second direction. The overspeed protection module is comprised of: an electric motor; a switching arrangement having a plurality of motor switches; a diode pump circuit; a comparator circuit; and a motor driver module that is configured to receive a shutdown signal from the comparator circuit and discontinue driving the motor in response to the shutdown signal.