CUTTING TOOL AND CONTROL METHOD
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United States of America Patent
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Issued Date -
Feb 1, 2024
app pub date -
Jun 15, 2023
filing date -
Jul 27, 2022
priority date (Note) -
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status (Latency Note)
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Abstract
A cutting tool includes: an electric motor with a stator having multiple windings and a rotor; a driver circuit electrically connected to the electric motor to drive the electric motor to run; and a controller configured to estimate the angular position of the rotor based on a working parameter of the electric motor and output a drive signal to the driver circuit based on the angular position of the rotor to control the rotation of the electric motor. At a start stage, the controller is configured to: when an abnormal start of the electric motor is detected, output a first control instruction to control the electric motor to restart, where the first control instruction includes at least the instruction to input a high-frequency signal into the driver circuit so as to acquire the angular position of the rotor.
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