49. Explain carefully how the resistance test is performed on an alternator. 60. What is ineant by the efective resistance of the armature winding? Why is it larger than the d-c resistance? 61. What relation exists between the resistance between lerminals and the resistance per phase in a Y-connected winding? in a delta-connected winding?

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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.