A 480V, 120KVA, 50HZ, 4-pole, Y-connected SG was tested to get VToc=500Vand Isc=180A at rated field current and Idc=50A at Vdc=25V. If the machine is operating at rated conditions and PF=0.92 lagging. www m 1. Find Armature Resistance (RA) and Synchronous Reactance (X) 2. Calculate the armature current, and the internal induced voltage EA. 3. Find the full load Voltage Regulation.

QUESTION 1 a) Write down three (3) factors that will determine the induced torque in a DC machine. b) Explain why higher voltage applied to a motor doesn't always mean that it will have a higher induced torque. You can give an example of the scenario to answer this question. c) When a motor is powered up and rotates, it will induce an internal generated voltage. Is this statement true or false? Justify your answer. d) For the core design shown in Fig. 1: i. Design the magnetic circuit model. Indicate clearly for each part that you use in the magnetic circuit which part of the core is represented. ii. Predict what will happen to the total reluctance if the depth is increased. Justify your answer. rl r2 r4 9 cm 9 cm -25 cm 15 cm to -25 cm- 9 cm 2 A 200 turns -0.04 cm 25 cm 9 ém

current - 1=?, and the power factor - cosp =?. 4. An out of balance three phase star connected load has the following complex currents: I₁ = lejº,A, I₂ =le¯6⁰,A and I₁=1e¹j6⁰, A. This load is supplied by a four wire power line from a balance voltage source. Find the r.m.s. value of the neutral current Io =? Wait to th

I want to represent each point on the graph paper with its corresponding scale written alongside it.

Q1/A) Fill in the following blanks 1. The air gap between stator and rotor is about...mm 2. The iron losses are depending on ..4sker,.ddcam 3. The relationship between stator and rotor current frequency is ....... 4. The range of operation mode slip is ...... 5. The relationship between hysteresis loss and frequency is .... 22 1-V T

Please all subparts

Reducing the supply voltage so that Vnew = Vold / V3 reduces the maximum torque of the motor so that Tmaxnew= ...Tmaxold . * .... ...

13/ Desc ribe The principle os operation and brief constru ctional de ta ils of a DC machine.

Q1. An SCR full bridge converter supplies power to a 560 V, 50 A, separately excited DC motor with an armature resistance of 1.2 Q. The voltage drop in the bridge SCRS is 20 V and this can be assumed constant. Power is supplied by an ideal 3-phase source with a line voltage of 415 V. Find the necessary delay angle and the motor back emf for (a) motoring operation at 50 A with motor terminal voltage of 500 V, and (b) regeneration operation 50 A with terminal voltage of 500 V.