Electric tool i.e. gun shaped power screwdriver, has coils inductively connected with each other for bidirectionally transmitting energy to supply energy to torque sensor and to transmit output signal of torque sensor to one of coils

摘要

The electric tool has a torque measuring device (30) and a motor that is accommodated in a housing. A motor shaft drives a drive shaft for driving the tool. Two coils (44, 46) are inductively connected with each other for bidirectionally transmitting energy to supply energy to a torque sensor (52) and to transmit an output signal of the torque sensor to one of the coils and to evaluate the output signal to generate a torque output signal. The coil is stationarly retained and the other coil is retained at the motor shaft or at the drive shaft. An independent claim is also included for a method for measuring torque of an electric tool.