CORDLESS POWER TOOL HAVING MULTI-SPEED TRANSMISSION AND CONSTANT SPEED IN LIGHT TORQUE RANGE

摘要

A kind of cordless power tool (300) has the light torque range of multiple speed range with a speed changer (12), the cordless power tool of the speed (8) of motor is to hold consultation to keep the output speed motor power (12) of speed changer constant, goes out motor until reaching predetermined maximum watt.