Question

A permanent magnet DC motor is supplied with 24V and 2A, and is operating at 1500...

A permanent magnet DC motor is supplied with 24V and 2A, and is operating at 1500 rpm. The motor is 85% efficient under these conditions. Assume no rotational losses. Find the machine constant Kv. Find the back EMF at 1500 rpm.

KV = __________

Ea = __________

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 permanent magnet DC motor with Kv = 0.7V-s is tested under the following two conditions:...
A permanent magnet DC motor with Kv = 0.7V-s is tested under the following two conditions: Test 1: Apply 120V; motor is unloaded, Ia = 2A and ?=160 rad/s Test 2: Apply 120V: increase load torque until Ia = 6A and ?=137.1 rad/s Find the mechanical torque loss and the load torque in test 2. Assume mechanical torque loss is constant (independent of speed). TMECH LOSS = __________ TLOAD = __________
A 5 HP, 120V DC motor has an efficiency of 92%. The machine constant Kv is...
A 5 HP, 120V DC motor has an efficiency of 92%. The machine constant Kv is 0.138V-s. Mechanical losses are 112 W. find: a. Current b. Armature resistance c. Rated speed (rpm)
a)Explain the shunt excitation and compound excitation of DC generator. b)A 240V compound DC motor has...
a)Explain the shunt excitation and compound excitation of DC generator. b)A 240V compound DC motor has the armature, series field and shunt field resistances are 0.22 Ω, 0.04 Ω and 200 Ω respectively. On full load, the line current is 17.5 A and the motor runs at 1800 rpm. (short shunt) i) Draw the diagram and the power flow of the motor. ii) Find the back EMF of the motor. iii) Find the mechanical power developed. iv) Find the output...
1) A DC machine induces an EMF of 240 v at 1500 rpm. Find the developed...
1) A DC machine induces an EMF of 240 v at 1500 rpm. Find the developed torque for an armature current of 25A. 2) Draw and explain all characteristics of d.c. Shunt motor. 3) State accessitivity of 3 point starter. 4) A four pole wave connected dc armature has 50 slots with 10 conductors per slot. The armature is rotated at 1000 rpm of the useful flux per pole is 30mwb, calculate the amount of EMF induced. 5) A 6...
A permanent magnet DC generator is run at a constant speed of 800 rpm and provides...
A permanent magnet DC generator is run at a constant speed of 800 rpm and provides a terminal voltage of 150 V at its rated loading. Its armature resistance is Ra=0.2 Ω. When the generator is not loaded, the input power is 300W and Vt= 165V. a) Calculate the voltage regulation of the generator. b) Calculate the armature current. For the same machine given assume now that it is loaded with a load of RL= 0.35 Ω. c) Calculate the...
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 20kW. 3-phase, +40 V. 4 pole, delta-connected permanent magnet synchronous motor has following parameters Xs=5...
A 20kW. 3-phase, +40 V. 4 pole, delta-connected permanent magnet synchronous motor has following parameters Xs=5 ohm, Rs negligible  rated power factor = 1.0. Machine is controlled by variable frequency control at a constant (V/f) ratio. Calculate (i) Armature current. torque angle and power factor at half full load torque and 750 rpm. (ii) armature current, torque angle and power factor at half full load torque and 1000 rpm. (iii) The braking torque, torque angle and power factor when working under...
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...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT