Method and apparatus for the detection of the position of an operating switch for starting an electric motor

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United States of America Patent

PATENT NO 10063165
APP PUB NO 20170302198A1
SERIAL NO

15488055

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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An electric motor is connected to a voltage source via a drive circuit and, between the drive circuit and the voltage source, the operating switch is arranged for the switching of the supply voltage (U) of the voltage source as the input voltage (UE) on the drive circuit. Following the switch-out of the electric motor, the input voltage (UE) on the drive circuit is monitored and a gradient of a rising voltage ramp (dU/dt) of the input voltage (UE) is determined. The gradient of the rising voltage ramp (dU/dt) of the input voltage (UE) thus determined is compared with a predefined limiting value and, in the event of an overshoot of the predefined limiting value, the operating switch is detected as closed, and the electric motor is restarted via the drive circuit.

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Patent Owner(s)

Patent OwnerAddress
ANDREAS STIHL AG & CO KGBADSTR 115 71336 WAIBLINGEN

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Gurr, Kay-Steffen Heilbronn, DE 16 24
Kloeker, Jens Erdmannhausen, DE 3 4
Leufen, Heinrich Schwaikheim, DE 19 238
Liebhard, Gernot Waiblingen, DE 23 249
Siller, Jochen Ludwigsburg, DE 1 0

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