A DC machine (6kW, 120V, 1200rpm) has the following magnetization characteristics when running at the rated speed. 0.1 | 0.2 | 0.4 79 0.5 93 | 1.0 /A E:N 0.3 0.6 0.8 1.2 |20 40 114 120 5 60 102 125 The machine has armature resistance of R3=0.20, and the field winding resistance of R=100 Q. Two windings are separated. The machine is driven at 800rpm now. We adjust l=0.8A, then parallel R=2 0 to its armature terminals so that the machine is turned into a generator. (a) Determine the KO for the machine @ l=0.8A; (b) Determine E, and la@ l=0.8A, n=800rpm; (c) Determine the torque and the power consumed by RL.

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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.