This motor has a series-field winding of 15 turns per pole. Its armature resistance in RA=0.05 22, and its series field resistance is Rs = 0.05 92. The magnetization curve at 1800 RPM is given by the following table: EA (V) F (Amp.turns) 50 95 125 150 180 200 212 229 243 250 253 200 500 755 1000 1280 1500 2000 2500 3000 3500 4000 The motor is operating at rated voltage, armature current of 100 Amperes, and with rotational losses of 1500 Watt. Find the speed of the motor. Answer: The speed of rotation is: RPM

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A 35.2 HP, 250 V, 100 A, 1800 RPM, series DC motor with armature reaction is considered in
this problem. The armature reaction counter magnetomotive force is F = 500 A.t.
AR
This motor has a series-field winding of 15 turns per pole. Its armature resistance in RA=0.05 2, and
its series field resistance is Rs = 0.05 92.
The magnetization curve at 1800 RPM is given by the following table:
EA (V)
F
(Amp.turns)
50 95 125
200 500 755
The motor is operating at rated voltage, armature current of 100 Amperes, and with rotational losses
of 1500 Watt.
Find the speed of the motor.
Answer:
The speed of rotation is:
RPM
150 180 200 212 229 243 250 253
1000 1280 1500 2000 2500 3000 3500 4000
Transcribed Image Text:A 35.2 HP, 250 V, 100 A, 1800 RPM, series DC motor with armature reaction is considered in this problem. The armature reaction counter magnetomotive force is F = 500 A.t. AR This motor has a series-field winding of 15 turns per pole. Its armature resistance in RA=0.05 2, and its series field resistance is Rs = 0.05 92. The magnetization curve at 1800 RPM is given by the following table: EA (V) F (Amp.turns) 50 95 125 200 500 755 The motor is operating at rated voltage, armature current of 100 Amperes, and with rotational losses of 1500 Watt. Find the speed of the motor. Answer: The speed of rotation is: RPM 150 180 200 212 229 243 250 253 1000 1280 1500 2000 2500 3000 3500 4000
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