Control Scheme for Detecting and Preventing Torque Conditions in a Power Tool

摘要

A control scheme is provided for a power tool (10) having a rotary shaft (12). The control scheme includes: monitoring rotational motion of the tool (10) generally about a longitudinal axis of the shaft (12); detecting a condition of the tool (10) based on the rotational motion of the tool (10); and controlling torque imparted to the shaft (12) upon detecting the tool condition, where the torque is inversely related to an angular displacement of the tool (10) about the longitudinal axis of the shaft.