Homework Help Question & Answers

Mechanical engineer or electrical engineer please help me

ing soru.png

A \(311 \mathrm{~V}, 60 \mathrm{~Hz}\), six pole, Y-connected, \(25 \mathrm{hp}\), design class B induction motor was tested in the laboratory and the following results were obtained.

- Idle; \(311 \mathrm{~V}, 22 \mathrm{~A}, 1200 \mathrm{~W}, 60 \mathrm{~Hz}\)

- Locked rotor; \(28.6 \mathrm{~V}, 64.5 \mathrm{~A}, 2200 \mathrm{~W}, 60 \mathrm{~Hz}\)

- DA experiment; \(14.5 \mathrm{~V}, 64.5 \mathrm{~A}\) Draw the equivalent circuit of this motor and calculate the rotor resistance and stator reactance values.

3 0
Report
Answer #1

Step 1 Given, = Line voltage VL = 311 V Frequency (f) = 60 Hz 311 = 179.55 V Vph V3 From DC analysis, V = 14.5 V I = 64.5 A 1Step 2 From Idle or No load condition: VL Vph 311 VL = u = Vph 311 Vph 179.55 V V3 = 179.55 V No load current = 22 A 179.55 XStep 3 From the locked rotor test, Vph = = VL = 28. 6 V 28.6 28:19 16.51 V Iph = 64. 5 A Blocked rotor impedance |Zlr = |Rlr= : RLR ZLR X cos OLR RiR = 0.256 x cos 46.484° RIR 0.256 X 0.688 RiR = 0.176 22 Now, RR = R1 + R2 :. R2 = 0.176 – 0.112 :. RXLR X1 + X2 = 2 0.1856 X = X2 = 2 X = X2 = 0.092 X1 + Xm 8. 161 12 Xm (8. 161 – 0.092) 12 8. 069 12 = Xm Step 5 The equivalenR,+ jX, jX2 Xom R Ο. R] = 0. 112 Ω R2 = 0. 064 Ω X = Χ2 = 0. 092 Ω Χn = 8. 069 Ω

Know the answer?
Add Answer to:
Mechanical engineer or electrical engineer please help me
Your Answer: Your Name: What's your source?
Not the answer you're looking for? Ask your own homework help question. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions
Free Homework App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.