Find the total external armature current of a dc machine which has the following specifications: 120 armature slots; 6 conductor per slot; 9300 lines per cm2 flux density; armature diameter of 28 inch ; 14 inch armature axial length ; 4 armature parallel path ; the pole span 72 % of the armature surface and the torque developed by the armature 1500 lb-ft. [Ans. Ia = 133.6 A]

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Winding and Constructions

Alternating Current (AC) winding is generally of the 3-phase type due to the inherent advantages of the 3-phase machine. Armature coils must be connected to the yield balance (equivalent in magnitude and 2/3 of the series phase difference of the rod) 3-phase electromotive forces (emf). The armature should be divided into step-bands to start with slots around the perimeter.In the construction of AC machines, the frame is used as an external protective shield to protect it from environmental conditions. The frame also serves as the outer perimeter, allowing the interior to be easily placed. The static state section of the devices is the stator winding attached stator.