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POWER TOOL HAVING A BRUSHLESS MOTOR AND A CONTROL UNIT FOR CONTROLLING THE BRUSHLESS MOTOR

  • US 20140210379A1
  • Filed: 01/28/2014
  • Published: 07/31/2014
  • Est. Priority Date: 01/28/2013
  • Status: Active Grant
First Claim
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1. A power tool, comprising:

  • a brushless motor;

    a battery voltage detection unit configured to detect a voltage of a battery that provides energy for driving the brushless motor;

    a rotational position detection unit configured to detect a rotational position of the brushless motor; and

    a control unit configured to control a drive output supplied to the brushless motor based at least in part on a signal from the rotational position detection unit;

    wherein,the control unit is configured to control a current conduction angle and/or an advance angle supplied to the brushless motor such that, during control of the drive output to the brushless motor, a rotational speed or a conducting current of the brushless motor reaches a target value based at least in part on a battery voltage detected by the battery voltage detection unit.

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