Control scheme for power tool having a brushless motor
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United States of America Patent
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Aug 16, 2022
Grant Date -
Aug 13, 2020
app pub date -
Apr 30, 2020
filing date -
Jun 24, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
A power tool is provided including a housing, an electric motor disposed within the housing, a power switch circuit disposed between a power supply and the electric motor, a main controller, and a secondary controller. The main controller is arranged to control a switching operation of the power switch circuit to regulate a speed of the motor, and is configured to monitor at least one of a speed or a rotational direction of the electric motor and deactivate the power switch circuit upon detection of fault condition associated the speed or the rotational direction of the electric motor. The secondary controller is configured to monitor at least one of the speed or the rotational direction of the electric motor independently from the main controller and deactivate the power switch circuit upon detection of fault condition associated the speed or the rotational direction of the electric motor.
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