3.iron losses iron losses are produced in the armature of a dc machine they are due to hysteresis and eddy currents as previously explained in section 2.27 and 2.30 iron losses depend upon the magnetic flux density the speed of rolation the quality of steel and the size of the armature the higher values occur in the armature leeth where the flux density may be as high as 1.7 T. the losses in the armature core are usually mush lower the losses can be minimized by annealing the
steel fig (6.4)