Control system and method for a power tool

摘要

An internal mass (32) with a wheel (30) is placed coaxial to the rotary shaft (12) rotatably. The rotational motion of the power tool (10) with respect to the inertial mass is monitored to activate a protective operation such as braking of rotary shaft, braking of motor, accordingly. Independent claims are also included for the following: (1) method for detecting a bit jam condition in power tool; and (2) control system for power tool.