POWER TOOL
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United States of America Patent
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-
N/A
Issued Date -
May 21, 2015
app pub date -
Oct 20, 2014
filing date -
Nov 21, 2013
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A power tool comprises a motor, an output torque calculation unit configured to calculate an output torque of the motor based on a current flowing through the motor, a friction torque calculation unit configured to calculate a friction torque of the motor based on a rotation speed of the motor, a load torque estimation unit configured to estimate a load torque acting on the motor, an inertia torque calculation unit configured to calculate an inertia torque based on the output torque, the friction torque and the load torque, and a motor deceleration unit configured to stop or decelerate the motor when the inertia torque is greater than an inertia torque reference value.
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Family
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