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MMLU-Pro / 11306 / Calculate the starting current and starting torque for the repulsion-start,…

Problem

Answer published by the source. Consult the official source to check your work against its answer.

question

Calculate the starting current and starting torque for the repulsion-start, induction-run motor described below: Rating:2 hp220 volts4 poles60 cycles Full-load torque = 96.5 oz-ft Maximum torque as induction motor = 228 oz-ft. r_1 = 0.765 \OmegaX_0 = 57.0 \Omega X_1 = 1.88 \OmegaK_r = 0.935 X_2 = 1.88 \Omegar_2 = 1.58 \Omega a = 4.68C (stator conductors) = 576 k_wl = 0.78r_c (short-circuited coils) = 0.00745\Omega a_3 = ratio of transformation stator to short-circuited coils a_3 = 56.25r_b(brush and brush contact) = 0.0140 \Omega Brush-shift angle = 16°

category

engineering

options

  1. 486 oz-ft, 30.65 amperes
  2. 520 oz-ft, 33 amperes
  3. 420 oz-ft, 31.5 amperes
  4. 475 oz-ft, 37 amperes
  5. 490 oz-ft, 32.5 amperes
  6. 510 oz-ft, 27 amperes
  7. 450 oz-ft, 28 amperes
  8. 500 oz-ft, 35 amperes
  9. 530 oz-ft, 29 amperes
  10. 560 oz-ft, 26 amperes

src

stemez-ElectricalMachines

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Source and history

upstream_id / Original problem ID
11306
task_id
bdfa0dc8-ce0f-5583-bb95-39f50fdcf2d3
task_key
default--test--11306
task_revision_id
1
config / split
default / test

Official source

initial import