Shown in Figure 1(a) is a separately excited generator. It is known that Rf-250, Ra- 10 Ω, v,-100...
The magnetization curve for a separately excited de generator is shown in Figure P8-7. The generator is rated at 6 kW, 120 V, 50 A, and 1800 r/min and is shown in Figure P8-8. Its field circuit is rated at 5A. The following data are known about the machine: R, -0.189 1,-120 V R-0400 R - 200 N, -1000 tums per pole Answer the following questions about this generator, assuming no armature reaction. (a) If this generator is operating at...
A second separately excited DC generator has the same electrical parameters as the generator in part (a) first but does not have compensating windings. The full-load demagnetising armature reaction is equivalent to 500 Ampere-turns. (i) With Radj = 63Ω and the generator is driven at 1600rpm, what is the no-load terminal voltage? (ii) What would be the output terminal voltage if 364A were drawn from the armature at 1600rpm? Q2. (a) Fig. Q20) shows a separately excited DC generator with...
2. A dc machine (6 kW, 120 V, 1200 rpm, Ra = 0.2 Ω, Rf = 100 Ω) has the following open circuit characteristics at 1200 rpm. If (A) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.8 1.0 1.2 1.4 Ea (V) 5 20 40 60 79 93 102 114 120 125 130 It has a field control resistance whose value can be varied from 0 to 150 Ω. The machine is driven at 1200 rpm and separately excited from...
Q2. (10 points) A 10 kW, 100 V, 1000 rpm dc shunt generator has armature resistance Ra = 0.1.2. The field current generating 100 V at no-load is 1.0 A. The magnetization characteristic at 1000 rpm is shown in figure below. The machine is operated as a separately excited dc generator at 1000 rpm with rated field current. Neglecting the armature reaction effect; (a) Determine full load armature current, la (b) Determine the terminal voltage at full load, with ly...
4. A separately excited de generator is rated at 172 kW, 430 V, 400 A, and 1800 rpm. Its field circuit has a total resistance Radi +Rp. Its magnetizing curve is shown in Fig. P4.1. The machine has the following characteristics: RA = 0.05 2; Rr = 20 2; Radi (a) Draw the schematic diagram of the generator. (b) If the variable resistor Radi in this generator's field circuit is adjusted to 63 2 and the generator's =0 to 300...
6. Shown in Figure 6(a) is the magnetization eurve of a DC machine at om 200 rad/s. Find the speed wm when the machine is configured as a shunt connection motor as shown in Figure 6(b) with a torque Tn 100 Nm added, and calculate the power developed by the motor. 15 points) Ea(v) 120 100-- ahn = 200 rad/s =0.2 Ω 8o - 100 n L.a Vin 100 v 60 40 20 Figure 6 6. Shown in Figure 6(a)...
part (b) Q5. The magnetization curve for a shunt DC generator is shown in Figure Q5-1.The generator is rated at 6 kW, 120 V, 50 A, and 1800 r/min and is shown in Figure Q5-2. Its field circuit is rated at 5A Figure Q5-1 The following data are known about the machine: 11r 0.180 120 V R, 24 Ω R.-0.18Ω -0 to 30 2 NF #1000 turns per pole v, Figure Q5-2 The shunt field resistor Radj is adjusted to...
i. The speed of a separately excited dc motor is controlled by a one-phase full-wave converter. The field circuit is also controlled by a full-wave converter, see V supply) Vs pk-150V Ra-0.310 L Rf 152O E-63V α. 1-35A Figure 3 The AC supply voltage to the armature and field converters is one-phase, 150Vpeak, 50Hz. The armature resistance Ra-0.31Ω, the field circuit resistance Rf-152Ω, and the motor voltage constant is Kv-1.3V/A. The armature current corresponding to the load demand la-35A The...
1) A separately excited shunt generator develops 400V at 1900 RPM. a) what will the voltage be at 1200 RPM b) what will be the voltage if the field is reduced by 8% 2) 16.5 HP is needed to drive a generator rated at 12.3 KW, 230V, 50A at 1680 RPM. Ra=.32 ohm. Determine: a) efficiency b) torque ( use T= 9.55 P/n) c) heat loss d) armature voltage 3) At full load a self excited shunt generator delivers 24KW,...
A 8250 w shunt DC motor has a terminal voltage of 300 V. A field resistance Rf of 40 Ω, and an armature resistance Ra of 250 mm2. The field winding has 1500 turns. An adjustable resistance Rad is connected in series to the field winding. Rad is set at 20 Ω, but it can vary from 0 to 80 Ω. The magnetization curve is shown in Figure.1 and it is taken at a speed of 1200 rpm. (Armature reaction...