A 280 V, separately excited DC motor with armature resistance of 122 and constant field excitation drives a load. The load torque is proportional to the speed. The motor draws a current of 30 A when running at a speed of 1000 rpm. Neglect frictional losses in the motor. The speed, in rpm, at which the motor will run, if an additional resistance of value 10 2 is connected in series with the armature, is

Q: = 0.03 N at 1140 rpm speed. The armature and field A 455 V, DC separately excited motor drives a…

A: “Since you have posted a question with multiple sub-parts, we will solve the first three sub-parts…

Q: V (Volts) 12V 30 18 42 t (ms) -12V

A: The waveform is shown below: (i) Peak value is the value of the maximum displacement of the wave…

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Q: A 24 KW, 140 V, Duplex LAP-wound DC machine has been set to induce rated voltage at a speed of 2200…

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Q: A dc shunt motor runs at 900 rpm from a 400V supply when taking an armature current of  25A.…

A: Given: A dc shunt motor N1=900 rpmV1=400 VIa1=25 AV2=230 VIa2=15 ARa=0.8 Ωϕ2=0.75ϕ1

Q: A 454 V, DC separately excited motor drives a variable torque load TL = 0.04 N at 1040 rpm speed.…

A: We are authorized to answer three subparts at a time. Since you have not mentioned which part you…

Q: An 4 pole, wave-wound DC motor has a 200 V supply.  The armature has 1000 conductors and a…

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Q: olb ir CI AT Classroom a docs.google.com A 300 V DC shunt motor runs at 2400 r.p.m when taking an…

A: The armature current is constant so back EMF will be constant in both cases. The speed after flux…

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Q: A 250 V de motor has an armature resistance of 0.25 2. It is drawing an armature current of 25A,…

A: Given a dc motor has, Terminal voltage, V=250 V. Armature resistance, Ra=0.25 Ω. Armature current,…

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Q: A 220 V permanent magnets DC motor has an armature resistance of 0.502. If the full load armature…

A: Given data, Terminal voltage V = 220 V. Armature resistance Ra=0.5 Ω. Armature current Ia=20 A.

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A: Given- 10HP @ 8000 RPM.I=40 A,V=220 V, To Find- Efficiency & useful torque.

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Q: The torque developed by a dc motor is 30 Nm when the armature current is 25 A. If the flux is…

A: Initial torque T1=30 Nm. Initial armature current Ia1=25 A. Let initial flux is ϕ1. Flux is reduced…

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Q: A 100 V DC separately excited motor has armature resistance 2 ohms and voltage constant of 0.6 V…

A: V = 100 V Ra = 2 ohm Kb= 0.6 V/rad/s T= 20 Nm Kt = 50 Nm/s

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A: Given: Back emf = 110V Armature Current = 90A speed = 1500rpm. The torque can be calculated by using…

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Q: ·A 4-pole, 250-V, d.c. shunt motor has a lap-connected armature with 960 conductors. The flux per…

A: Given: A DC shunt lap connected motor has: Poles, P=4 Voltage, V=250 V Number of conductors, Z=960…

Q: a) Draw the armature and excitation circuit of the motor and write the formulas for the equivalent…

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Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.