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Anti-kickback and breakthrough torque control for power tool

  • US 6,479,958 B1
  • Filed: 10/22/1996
  • Issued: 11/12/2002
  • Est. Priority Date: 01/06/1995
  • Status: Expired due to Fees
First Claim
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1. A method of controlling a power tool having a motor that imparts torque to an output spindle when actuated by an operator actuable switch, the power tool having a characteristic natural resonant frequency, comprising:

  • sensing a motor parameter indicative of the onset of an impending stall condition; and

    in response to the sensed onset of an impending stall condition and while the switch remains actuated, pulsing the motor a plurality of times at a frequency substantially harmonically related to said natural resonant frequency to deliver a series of torque pulses having peak torque substantially greater than the average torque delivered during the series.

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