Question

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 regenerative braking at rated motor current and 750 rpm.


440V
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 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,...
The 400 V, 50 kVA, 0.8 power factor leading delta connected synchronous motor has synchronous reactance...
The 400 V, 50 kVA, 0.8 power factor leading delta connected synchronous motor has synchronous reactance of 3-ohm, resistance neglected. It is supplying a 12-kW load with initial power factor of 0.86 lagging. The windage and friction losses are 2.0 kW and the core losses are 1.5 kW. Determine (a) the motor efficiency; the line current; armature current; and excitation voltage. (b) If the flux of the motor is increased by 20 percent determine the excitation voltage; armature current; and...
A three phase Y connected synchronous motor has negligible armature resistance and a synchronous reactance of...
A three phase Y connected synchronous motor has negligible armature resistance and a synchronous reactance of 12 ohm/phase. The motor takes 12,000kW at a line voltage of 13,200V. If the line current is adjusted so that the excitation voltage is 9000V/phase: a. What is the torque angle? b. At what power factor is the motor operating? c. What is its armature current?
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...
Question A 208 V 10 Hp four pole 60 Hz Y connected induction motor has a...
Question A 208 V 10 Hp four pole 60 Hz Y connected induction motor has a full load slip of 5%. a)-What is the synchronous speed of this motor? b)-What is the shaft speed of this motor at full load? c)-What is the frequency of rotor current at full load? d)-What is the shaft torque of this motor at full load? e)-If the efficiency of this motor is 90% at full load what is the input power f)-If the efficiency...
A 3- phase, 2 pole Y-connected synchronous machines has a line-line voltage of 6,000V in 60Hz...
A 3- phase, 2 pole Y-connected synchronous machines has a line-line voltage of 6,000V in 60Hz power line, has an armature reactance of 2ohms/ phase and negligible armature resistance. Compute the following A) In case of generating action if the line current is 385 A at a leading power factor of 0.8, the armature voltage per phase is 3464V, Compute the voltage per phase and power angle. B) Draw the phasor diagram. C) If the losses in the machine is...
(360) Volt, 60 Hz, 600 hp, 0.6 pf-leading, four-pole -connected synchronous motor has 0.9Ω synchronous reactance....
(360) Volt, 60 Hz, 600 hp, 0.6 pf-leading, four-pole -connected synchronous motor has 0.9Ω synchronous reactance. Friction; wind; core losses and armature resistance are neglected. a) If the motor is operating under magnitude of phase current (ia) (180) Ampere and power factor of 0.6 lagging, 1. Find the input power of motor in hp 2. Find the generated voltage, EA 3. Find the torque and the maximum inducible torque in current state. b) If EA is increased by 18% find,...
A 480V, 60 Hz, 6-pole, three-phase, delta-connected induction motor has the following parameters: R1=0.461 Ω, R2=0.258...
A 480V, 60 Hz, 6-pole, three-phase, delta-connected induction motor has the following parameters: R1=0.461 Ω, R2=0.258 Ω, X1=0.507 Ω, X2=0.309 Ω, Xm=30.74 Ω Rotational losses are 2450W. Core loss is neglected. The motor drives a mechanical load at a speed of 1170 rpm. Ns = 1200rpm slip = 0.025 Line current = 26.87 angle -0.38 Pin = 20.745KW Airgap power = 19.71KW Converted power = 19.21KW Torque = 156.85Nm Pout = 16.76KW efficiency = 80.79% Find : 1. Pullout slip...
410 Volt, 60 Hz, 600 hp, 0.6 pf-leading, four-pole Triangle connected synchronous motor has 0.9Ω synchronous...
410 Volt, 60 Hz, 600 hp, 0.6 pf-leading, four-pole Triangle connected synchronous motor has 0.9Ω synchronous reactance. Friction; wind; core losses and armature resistance are neglected. a) If the motor is operating under magnitude of phase current (ia) 230 Ampere and power factor of 0.6 lagging, 1. Find the input power of motor in hp (10p) 2. Find the generated voltage, EA (10p) 3. Find the torque and the maximum inducible torque in current state. (10p) b) If EA is...
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...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT