A DC shunt motor drives a centrifugal pump at a speed of 1300 rpm when the terminal voltage and line currents are 230 V and 55 A, respectively. The armature and field resistances are 0.2 N and 1002, respectively. 1- Calculate the resistance that should Quality Control in Construction: Centrifugal Pump be added Radd N to the armature circuit to reduce the speed to 650 rpm.

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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.