Electric pulse tool

An electric power tool comprising an electrical motor adapted to drive a rotating shaft of the electric power tool, the electric motor adapted to be fed with a pulsed current where the pulsed current comprises a main current pulse (A) in a first direction driving the rotating shaft in a first direction and adapted to provide a current (C) in an opposite direction to the first direction following the main current pulse to retract the electrical power tool, wherein the pulsed current prior to the current (C) in the opposite direction comprises a first pre-pulse current pulse (B) in the same direction as the current in the opposite direction and of a magnitude lower than the current in the opposite direction and wherein the pulsed current prior to the main pulse comprises a second pre-pulse current pulse (D) wherein the current pulse of the second pre-pulse is in the same direction as the main current pulse and of a magnitude lower than the main current pulse.

A method of controlling current supplied to a motor of an electric power tool, the electric power tool comprising a rotating shaft driven by the motor, the control method comprising providing a pulsed current comprising a main current pulse (A) in a first direction driving the rotating shaft in a first direction to add torque to a joint and a current (C) in an opposite direction to the first direction following the main current pulse to retract the electrical power tool, the method further comprising providing a first pre-pulse current pulse (B) prior to the current pulse in the opposite direction wherein the current pulse of the first pre-pulse is in the same direction as the current pulse in the opposite direction and of a magnitude lower than the current pulse in the opposite direction and providing a second pre-pulse current pulse (D) prior to the main pulse wherein the current pulse of the second pre-pulse is in the same direction as the main current pulse and of a magnitude lower than the main current pulse.

A method of controlling current supplied to a motor of an electric power tool, the electric power tool comprising a rotating shaft driven by the motor, the control method comprising providing a pulsed current comprising a main current pulse (A) in a first direction driving the rotating shaft in a first direction to add torque to a joint and providing a current pulse (D) prior to the main pulse wherein the current pulse is in the same direction as the main current pulse and of a magnitude lower than the main current pulse to remove forward backlash.