If the resistor R_adj = 175 ohm, what is the rotational speed of the motor at no-load conditions?

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Internal generated voltage E₁, V
In a DC motor,
P_rated = 30hp
I_L rated = 110A
V_T = 240V
n_rated = 1800rpm
N_F= 2700 turns per pole
300
N_SE= 14 turns per pole
R_A = 0.19 ohm
R_F = 75 ohm
R_s = 0.02 ohm
R_adj = 100-400 ohm
Rotational losses = 3550W
Magnetization curve is given below:
280
260
240
220
>200
180
160
140
120
100
80
60
40
D
20
OO
Assume that the motor described above can be connected in shunt. The equivalent circuit of the shunt motor is shown
below.
(A) 1200
0
0 0.1 0.2 0.3 04 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2
Shunt field current, A
B 1195
C 1205
Magnetization curve
EA
1190
Speed 1800 r/min
RA
If the resistor R_adj = 175 ohm, what is the rotational speed of the motor at no-load conditions?
If the resistor R_adj = 175 ohm, what is the rotational speed of the motor at no-load conditions?
0.19 2
IF Į
0
RE
750
Radi
Vr=240 V
Transcribed Image Text:Internal generated voltage E₁, V In a DC motor, P_rated = 30hp I_L rated = 110A V_T = 240V n_rated = 1800rpm N_F= 2700 turns per pole 300 N_SE= 14 turns per pole R_A = 0.19 ohm R_F = 75 ohm R_s = 0.02 ohm R_adj = 100-400 ohm Rotational losses = 3550W Magnetization curve is given below: 280 260 240 220 >200 180 160 140 120 100 80 60 40 D 20 OO Assume that the motor described above can be connected in shunt. The equivalent circuit of the shunt motor is shown below. (A) 1200 0 0 0.1 0.2 0.3 04 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 Shunt field current, A B 1195 C 1205 Magnetization curve EA 1190 Speed 1800 r/min RA If the resistor R_adj = 175 ohm, what is the rotational speed of the motor at no-load conditions? If the resistor R_adj = 175 ohm, what is the rotational speed of the motor at no-load conditions? 0.19 2 IF Į 0 RE 750 Radi Vr=240 V
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