a shunt motor, the permanent magnet is replaced by an electromagnet activated by a field coil that shunts the armature. The shunt motor has an armature resistance of 0.050 Ω and is connected to 120 V mains. (a) What is the armature current  at the starting instant, that is, before the armature develops any back emf? (b) What starting rheostat resistance R, in series with the armature, will limit the starting current at 60 A? (c) With no starting resistance, what back emf is generated when the armature

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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.