In DC motors, whole of the electromagnetic torque (Te) developed in the armature is not available at the shaft. A part of it is lost to overcome the iron and mechanical (friction and windage) losses. Therefore, shaft torque (Tsh) is somewhat less than the torque developed in the armature. Thus, in the case of DC motors, the actual torque available at the shaft for doing useful mechanical work is known as shaft torque.
Leave a Reply