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Electric tool and controlling method thereof

  • US 9,707,671 B2
  • Filed: 04/29/2014
  • Issued: 07/18/2017
  • Est. Priority Date: 05/20/2013
  • Status: Active Grant
First Claim
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1. An electric tool, comprising:

  • a motor;

    an implementing member driven by the motor for driving a working element; and

    a controlling circuit for controlling the electric tool, wherein the controlling circuit comprises;

    a current detecting module for detecting current flowing through the motor;

    a microprocessor for memorizing and storing a current value;

    an user interface module connected to the microprocessor for a user to select working modes, the working modes at least comprising;

    a learning mode for recording the current value when the implementing member has driven the working element; and

    a constant torque mode for driving other working elements having the same size based on the recorded current value; and

    a driving module controlled by the microprocessor for driving or stopping a torque output of the motor.

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