1. A d.c. series motor is controlled by a chopper. Drive parameters are as follows: (Ra + Rf) = 0.12 kv = 10 mV/A-rad/s Vb = 96V f= 125HZ (a) With an armature torque of 5Nm, the speed is 1500rev/min. What are the values of armature current and turn-on time? (b) The shaft torque is increased to 20NM and the chopper on-time increased to hold the armature speed at 1500rev/min. What is the new armature current and on-time?

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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.