A series DC motor has a series-field winding of 25 turns per pole. Its armature resistance is 0.15 0. and its field resistance is 0.05 0. When the motor is rotating at 900 RPM, with a 380 V DC supply, its current is 142 A. and rotational losses of 4500 Watt. Find the copper losses and the efficiency of this motor. Answers: Pcu- Watt, and %n - %.

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Q: A series DC motor has a series-field winding of 25 turns per pole. Its armature resistance is 0.15…

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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.