Handheld work apparatus having a drive circuit for an electric motor which drives oscillating tools
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United States of America Patent
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Aug 22, 2017
Issued Date -
N/A
app pub date -
Sep 12, 2013
filing date -
Sep 12, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
A handheld work apparatus having an electric motor and a drive circuit for the electric motor. The rotation movement of the motor is converted into an oscillating movement of the work tool via a gear mechanism. The motor is situated in a circuit including at least the motor and a switch for operating the motor. To reduce wear of the gear mechanism, a control unit for operating the motor in one of two directions of rotation is provided. The control unit independently determines a selected direction of rotation for a next operating cycle as a function of a control variable. When the motor is started, the motor is started by the control unit in the direction of rotation which is associated with a value of the control variable. The control variable changes before the motor is restarted for a following operating cycle.
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