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1. A motor has an armature resistance of 3.00 Q. If it draws 5.00 A when...
a) A motor has an armature resistance of 5.17 Ohm. If the motor draws 7.04 A...
a) A motor has an armature resistance of 5.17 Ohm. If the motor draws 7.04 A when running at full speed and connected to a 120 V supply line, how large is the back EMF? b) What would the current in the motor be if the load causes it to run at half speed? Assume that the supply voltage is fixed.
3) The armature of a permanent-magnet dc motor has a resistance of 0.72 and draws a...
3) The armature of a permanent-magnet dc motor has a resistance of 0.72 and draws a current of 50 A when the speed is 1500 r/min when the armature is connected to a source of 48 V, calculate the following: a) The induced emf, EA, and the torque, T, produced at this speed. b) The motor speed, n (in rpm), when the torque is 2 Nm. c) The armature current at 1600 r/min. d) The torque at 1600 r/min. e)...
The armature windings of a dc motor have a resistance of 8.0 Ω . The motor...
The armature windings of a dc motor have a resistance of 8.0 Ω . The motor is connected to a 120-V line, and when the motor reaches full speed against its normal load, the back emf is 108 V. The load is increased so it causes the motor to run at half speed. What will be the current in the motor in this case? (Express your answer to two significant figures and include the appropriate units.)
A 120-V, series-wound motor has a field resistance of 4.0 and an armature resistance of...
A 120-V, series-wound motor has a field resistance of 4.0 and an armature resistance of 2.5 . (a) Determine the current drawn by the motor at the very instant it is switched on, i.e., when it has not started to rotate. (b) When it is operating at nominal speed, a back emf of 85.0 V is generated. How much current is drawn in this case? (c) What is the furnished mechanical power? (d) How much power is dissipated?...
03 (5pts): A 250-V shunt motor has an armature resistance of 0.25 Ohms and a field...
03 (5pts): A 250-V shunt motor has an armature resistance of 0.25 Ohms and a field resistance of 125 Ohms. At no-load the motor takes a line current of 5.0 A while running at 1200 rpm. If the line current at full-load is 62.0 A, what is the full-load speed? When the line current is 62 A, the field resistance is increased to 200 Ohms, what is the new speed of the motor?
A d.c 220 V, shunt motor has an armature resistance of 1 Ω and a field...
A d.c 220 V, shunt motor has an armature resistance of 1 Ω and a field circuit resistance of 150 Ω. While running steadily from 220 V supply, its back emf is found to be 209 V. The motor is drawing a line current of:
Problem 6: A 230-V shunt motor has an armature resistance of 0.05 Ohms and a field resistance of 75 Ohms. The motor draws 7 A of line current while running light at 1120 rpm. The line current at a...
Problem 6: A 230-V shunt motor has an armature resistance of 0.05 Ohms and a field resistance of 75 Ohms. The motor draws 7 A of line current while running light at 1120 rpm. The line current at a certain load is 46 A. (a) What is the motor speed at this load? (b) At this load, if the field circuit resistance is increased to 100 Ohms, what is the new speed of the motor? Assume linearity between the flux...
P4-17) A 240 V separately exited dc motor has an armature resistance of Ra = 006...
P4-17) A 240 V separately exited dc motor has an armature resistance of Ra = 006 Ω, when it is connected to a 240 V supply, it draws 90 A from the supply and rotates at 1200 rpm. Find the torque developed by the motor at this operating condition. If the torque developed is 280 Nm for the same excitation and same supply voltage, then find the speed and armature current. a) b)
1. A 300 V compound motor has armature resistance 0.18 Ω, series field resistance 0.3 Ω...
1. A 300 V compound motor has armature resistance 0.18 Ω, series field resistance 0.3 Ω and shunt field resistance 100 Ω. The rotational losses are 200 W. On full load the line current is 25 A and the motor runs at 1800 rpm. Determine: (i) the developed mechanical power (ii) the output power (iii) the output torque (iv) the efficiency at full load 2. A 120 V series motor has 0.2 Ω field resistance. On full load, the line...
FQ3 3. A 240 V DC series motor with 0.1 ohm armature resistance and 0.1 ohm...
FQ3
3. A 240 V DC series motor with 0.1 ohm armature resistance and 0.1 ohm field resistance runs at 1200 rpm and 100 Amp. of full load speed and armature current respectively. The motor has a brush contact drop of 2 volts. Find the motor full load torque and efficiency If the motor is to drive a pump that requires a torque of 150 NM, find the speed as the motor drives the given pump. a. b.
3) The armature of a permanent-magnet dc motor has a resistance of 0.72 and draws a current of 50 A when the speed is 1500 r/min when the armature is connected to a source of 48 V, calculate the following: a) The induced emf, EA, and the torque, T, produced at this speed. b) The motor speed, n (in rpm), when the torque is 2 Nm. c) The armature current at 1600 r/min. d) The torque at 1600 r/min. e)...
03 (5pts): A 250-V shunt motor has an armature resistance of 0.25 Ohms and a field resistance of 125 Ohms. At no-load the motor takes a line current of 5.0 A while running at 1200 rpm. If the line current at full-load is 62.0 A, what is the full-load speed? When the line current is 62 A, the field resistance is increased to 200 Ohms, what is the new speed of the motor?
Problem 6: A 230-V shunt motor has an armature resistance of 0.05 Ohms and a field resistance of 75 Ohms. The motor draws 7 A of line current while running light at 1120 rpm. The line current at a certain load is 46 A. (a) What is the motor speed at this load? (b) At this load, if the field circuit resistance is increased to 100 Ohms, what is the new speed of the motor? Assume linearity between the flux...
P4-17) A 240 V separately exited dc motor has an armature resistance of Ra = 006 Ω, when it is connected to a 240 V supply, it draws 90 A from the supply and rotates at 1200 rpm. Find the torque developed by the motor at this operating condition. If the torque developed is 280 Nm for the same excitation and same supply voltage, then find the speed and armature current. a) b)
FQ3
3. A 240 V DC series motor with 0.1 ohm armature resistance and 0.1 ohm field resistance runs at 1200 rpm and 100 Amp. of full load speed and armature current respectively. The motor has a brush contact drop of 2 volts. Find the motor full load torque and efficiency If the motor is to drive a pump that requires a torque of 150 NM, find the speed as the motor drives the given pump. a. b.
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