Abstract: An engine driven arc welder including a welding generator driven by an engine; output circuits for controlling the output of the welding generator in accordance with a control signal and for delivering the output to welding output terminals; a current detector for detecting the current flowing in the welding output terminals; an error detector for comparing the output of the current detector with a reference signal to detect error; a control signal producing circuit for producing the control signal in accordance with output of the error detector and for delivering it to the output circuit; and a voltage detector R10, VR10 for detecting voltage to be delivered to the welding output terminals, wherein the arc welder has a welding output characteristic having a constant current control arc characteristic in accordance with the reference signal and which exhibits a drooping characteristic in the vicinity of the arcing voltage and which is capable of increasing the current when the arc voltage is lowered.

Abstract: A rotor with permanent magnet capable of fixing permanent magnets on the rotor iron core by a simple method. This rotor with permanent magnet comprises; a rotor iron core in which rotor iron plates provided with plural recessed portion in trapezoidal form at suitable intervals are formed in stacked manner on the outer circumference, fitting grooves comprised of continuity of the recessed portions on the outer circumferential surface thereof; a pair of end plates provided at respective end surfaces of the rotor iron core; fixing members formed by non-magnetic material, the fixing members being inserted into the respective fitting grooves to form a plurality of areas partitioned by the outer circumferential surface of the rotor iron core along with the end plates; and a plurality of permanent magnets fixed in the respective areas between these fixing members.

Abstract: Disclosed is an engine-driven welding generator using a plurality of neodymium-iron-boron based rare earth magnets and provided with countermeasures for suppressing a rise in temperature of the magnets.

Abstract: A rotor with permanent magnet capable of fixing permanent magnets on the rotor iron core by a simple method. This rotor with permanent magnet comprises; a rotor iron core in which rotor iron plates provided with plural recessed portion in trapezoidal form at suitable intervals are formed in stacked manner on the outer circumference, fitting grooves comprised of continuity of the recessed portions on the outer circumferential surface thereof; a pair of end plates provided at respective end surfaces of the rotor iron core; fixing members formed by non-magnetic material, the fixing members being inserted into the respective fitting grooves to form a plurality of areas partitioned by the outer circumferential surface of the rotor iron core along with the end plates; and a plurality of permanent magnets fixed in the respective areas between these fixing members.

Abstract: Disclosed is an engine-driven welding generator using a plurality of neodymium-iron-boron based rare earth magnets and provided with countermeasures for suppressing a rise in temperature of the magnets.