Question

An 800 rpm, 500 V, 120 A (armature current), series motor has a field resistance of...

An 800 rpm, 500 V, 120 A (armature current), series motor has a field resistance of 0,04 Ω and an armature resistance of 0.11 Ω. Determine the speed of the motor: 2.1 For a supply voltage of 550 V and a current of 60 A. (9) 2.2 For a torque of 50% of full-load, a supply voltage of 500 V and a diverter across the field of 0.08 Ω. (11) 2.3 With a resistance of 1 Ω in series with the armature, the torque being 75% of full load and a supply voltage of 500 V.

Engineering   Electrical-Engineering   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A 230 V, 250 rpm, 100 A separately excited dc motor has an armature resistance of...
A 230 V, 250 rpm, 100 A separately excited dc motor has an armature resistance of 0.5 Ω. The motor is connected to 230 V dc supply and rated dc voltage is applied the field winding. It is driving a load whose torque-speed characteristic is given by TL = 500 − 10ω where ω is the speed in rad/sec and TL is the load torque in N-m. Find (a) the steady state speed at which the motor will drive the...
A separately excited DC motor has the following parameters: field resistance = 250 ?, armature resistance...
A separately excited DC motor has the following parameters: field resistance = 250 ?, armature resistance = 0.03 ?, terminal voltage = 250 V and field voltage = 250 V. Initially the machine runs at 1000 rpm with the terminal voltage = 250 V and armature current = 120 A. a) find the speed of the motor if the load torque dropped to 50% of its original value, b) find the speed of the motor if the armature voltage is...
A 200 V DC, 1,800 RPM shunt connected motor has an armature resistance of 0.4 ohm...
A 200 V DC, 1,800 RPM shunt connected motor has an armature resistance of 0.4 ohm and a brush resistance of 0.4 ohm; brush voltage drop of 6.0 V, independent of load. The resistance of the shunt field is 230 ohm. The full load rated line current is 40 A. When the motor is operated at no load the line current is 5 A and the speed is 1750 RPM. Calculate speed at rated load Calculate speed at .3 rated...
The full-load armature current of a 5 hp, 150 V shunt dc motor is 30 A....
The full-load armature current of a 5 hp, 150 V shunt dc motor is 30 A. The field (shunt) resistance and the armature resistance of the motor are ????F = 125 ? and ???????? = 0.15, respectively. At a random speed of 1800 rpm magnetization curve of the motor has measured and is shown in the table below. ????0 (V) armature voltage 10 90 110 140 170 185 ???????? (A) field (shunt) current 0 0.82 1 1.2 1.7 2.88 Calculate...
A 230-V DC shunt motor has armature circuit resistance of 0.25 ? and field circuit resistance...
A 230-V DC shunt motor has armature circuit resistance of 0.25 ? and field circuit resistance of 115 ?. At full load armature draws a current of 38 A and the speed is measured at 1050 rpm. Find the developed torque. The field rheostat is now changed so that total field resistance is 144 ?. Find the speed under this condition. Assume that the armature current does not change. Assuming the rotational losses amount to 600 W, find the efficiency...
Question 2 The full-load armature current of a 5 hp, 150 V shunt dc motor is...
Question 2 The full-load armature current of a 5 hp, 150 V shunt dc motor is 30 A. The field (shunt) resistance and the armature resistance of the motor are ????F=125 ? and ????????=0.15, respectively. At a random speed of 1800 rpm magnetization curve of the motor has measured and is shown in the table below. EO(V) armature voltage 10 90 110 140 170 185 IF (A) field (shunt) current 0 0.82 1 1.2 1.7 2.88 Calculate the following: a....
A 100 hp, 250 V, 1200 rpm DC shunt motor with an armature resistance of 0.03...
A 100 hp, 250 V, 1200 rpm DC shunt motor with an armature resistance of 0.03 ? and a field resistance of 41.67 ?. The motor has compensating windings, so armature reactance can be ignored. Mechanical and core losses may be ignored also. The motor is driving a load with a line current of 126 A and an initial speed of 1103 rpm. The magnetization curve is shown in the following figure. 1. What is the motor speed if the...
B// A 4- pole 220 V, lap wound shunt D.C motor runs at 800 rpm takes...
B// A 4- pole 220 V, lap wound shunt D.C motor runs at 800 rpm takes 35 A. The shunt field resistance is 110 Ω and armature resistance is 0.4 Ω iron and friction losses is 800 W. Find. a- Maximum efficiency. b- The resistance sections of starter connected to this motor by using same armature resistance and voltage supply from above. if maximum armature current is 50 A and the resistance of first section is 1.95 Ω
A separate excited DC motor is running at 1000 rpm when the armature voltage is 600...
A separate excited DC motor is running at 1000 rpm when the armature voltage is 600 V. The motor has a field constant Kphi = 4 V.sec and the armature resistance of the motor is 0.8 Ohms. i. Calculate the value of the resistance of the dynamic braking at full load. The armature current should be limited to 200 % of the rated value. ii. If the motor operates in regenerative braking at a speed of 1200 rpm, calculate the...
A 5-kW, 220-V shunt motor has an armature resistance of 0.15 ? and a field-circuit resistance...
A 5-kW, 220-V shunt motor has an armature resistance of 0.15 ? and a field-circuit resistance of 100 ?. The motor delivers rated output power at rated voltage when its armature current is 20 A. When the motor is operating at rated voltage, the speed is observed to be 1000 r/min when the machine is loaded such that the armature current is 15 A. In order to protect both the motor and the dc supply under starting conditions, an external...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT