Question

A 3-phase 50Hz 2-pole 440V (L-L rms) induction motor drive has a rated speed of 2955...

A 3-phase 50Hz 2-pole 440V (L-L rms) induction motor drive has a rated speed of 2955 rpm and rated torque of 35 Nm. This motor drives a load with a torque characteristic that increases linearly with speed such that it equals the load torque at the rated speed. It draws a current of 3.0 A(rms) per phase at the rated voltage at a power factor of 0.81 (lagging). The stator resistance Rs = {r_s} ohms. At the rated operating speed, calculate the frequency (fbraking) of the phase voltage (Va,braking) needed produce a regenerative braking torque that is 1.4 times the rated torque in magnitude.

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 three-phase, 60-Hz, 4-pole, 440-V (line-line, rms) induction-motor drive has a full-load (rated) speed of 1746...
A three-phase, 60-Hz, 4-pole, 440-V (line-line, rms) induction-motor drive has a full-load (rated) speed of 1746 rpm. The rated torque is 40 Nm. Keeping the air gap flux-density peak constant at its rated value. The frequency and voltage of the motor from above are adjusted such that the fan speed is changed to 600 rpm. The motor should be operating at 3% slip and rated Bm. What is the motor efficiency?
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...
The parameters of a 3-phase, 4-pole, 50 Hz, Y-connected, wound-rotor induction motor are listed below. These...
The parameters of a 3-phase, 4-pole, 50 Hz, Y-connected, wound-rotor induction motor are listed below. These are the default values of the "Asynchronous Machine" model in MATLAB Simulink. r1=0.5968 Ω; r2=0.6258 Ω; L1=0.0003495 H; L2=0.005473 H; Lm=0.0354 H; Stator line voltage = 400 V rms. The motor for rotor speeds nm= 0 to 1500 rpm. X1= 0.1097 ohm, X2= 1.719 ohm , Xm= 11.12 ohm, RTH = 0.5853 , XTH = 0.1395 and VTH = 230.82 V. Suppose the motor...
The voltage applied to the stator of a 3-phase induction motor is reduced from 100V to...
The voltage applied to the stator of a 3-phase induction motor is reduced from 100V to a 75V and then to a 50V. Draw the torque-speed characteristics of the motor with these values. The load torque is proportional to the speed squared.
A submarine has a 3-phase, Y-connected, 2- pole, 60Hz synchronous generator rated to deliver 1687.5 kVA...
A submarine has a 3-phase, Y-connected, 2- pole, 60Hz synchronous generator rated to deliver 1687.5 kVA at a FP = 0.8 lagging with a line voltage of 450-V. The machine stator resistance RS = 0.004 ?. The synchronous reactance is Xs=0.08 ?. The actual system load on the machine draws 900 kW at FP = 0.6 lagging. Assume that a voltage regulator has automatically adjusted the field current so that the terminal voltage is its rated value. Mechanical losses are...
The parameters of a 3-phase, 4-pole, 50 Hz, Y-connected, wound-rotor induction motor are listed below. These...
The parameters of a 3-phase, 4-pole, 50 Hz, Y-connected, wound-rotor induction motor are listed below. These are the default values of the “Asynchronous Machine” model in MATLAB Simulink. r1=0.5968 ?; r2=0.6258 ?; L1=0.0003495 H; L2=0.005473 H; Lm=0.0354 H; Stator line voltage = 400 V rms. The motor for rotor speeds nm= 0 to 1500 rpm. X1= 0.1097 ohm, X2= 1.719 ohm , Xm= 11.12 ohm, RTH = 0.5853 , XTH = 0.1395 and VTH = 230.82 V. Suppose the motor...
A three phase, 4 pole induction motor has the nominal speed of 1425 rpm. If the...
A three phase, 4 pole induction motor has the nominal speed of 1425 rpm. If the stator, rotor and airgap losses are all the same what is the efficiency of the machine?
A 230 volt, 60 Hz, 4 pole star connected, three phase induction motor operates at a...
A 230 volt, 60 Hz, 4 pole star connected, three phase induction motor operates at a full load speed of 1710 rpm. The power developed at this speed is 2 horse power. If the supply voltage fluctuates ±10%, determine the torque range of the motor.
A 37.3 kW, 3 phase, 4 pole, 50 Hz, induction motor has a full load efficiency...
A 37.3 kW, 3 phase, 4 pole, 50 Hz, induction motor has a full load efficiency of 85%. The friction and windage losses are one third of the no load losses and the copper loss equals the iron loss at full load. Find the full load speed. Stator resistance may be neglected. [Answer: 1401.3 rpm]
Question2: Calculate the total machine losses under this condition: A 415V, 50Hz, 2790rpm, 3 phase, star-connected...
Question2: Calculate the total machine losses under this condition: A 415V, 50Hz, 2790rpm, 3 phase, star-connected induction motor has the following equivalent circuit parameters (all referred to the stator winding) : stator leakage reactance X1= 0.3 ohm, stator resistance R1= 0.2 ohms, rotor leakage reactance X2' = 0.3 ohm, rotor resistance R2' = 0.16 ohm, magnetising reactance XM = 12 ohm, core-loss resistance = 150 ohms. Use the simplified equivalent circuit for the following calculations. Under a certain operating condition...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT