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Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN: 9780133923605
Author: Robert L. Boylestad
Publisher: PEARSON
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
Transcribed Image Text:6-5.
A 208-V four-pole 60-Hz Y-connected wound-rotor induction motor is rated at 30 hp. Its equivalent
circuit components are
R = 0.100 2
R, = 0.070 2
XM = 10.0 2
%3D
X, = 0.210 2
X, =0.210 2
P.
mech
= 500 W
Pnise 0
= 400 W
core
For a slip of 0.05, find
(a) The line current I,
(b) The stator copper losses PSCL
(c) The air-gap power PAG
(d) The power converted from electrical to mechanical form P
conv
(e) The induced torque Tind
() The load torque Tload
(g) The overall machine efficiency
(h) The motor speed in revolutions per minute and radians
per
second
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- A) Although the magnetic field for each phase of a 3-phase induction motor is merely switching back and forth between north and south poles, the resultant magnetic influence from all phases sets up a rotating magnetic field to cut the rotor conductors. a) true b) false B) In a two-pole stator winding of a 3-phase motor, how many revolutions does the rotating magnetic field make in one cycle of the electrical current? a) one b) 60 c) 3600 d) none of the above 3.arrow_forwardhow does the rotor of a 3-phase induction motor get power a- through brushes and commutador segments b- through brushes and slip ring c- indution from the stator d- none of the abovearrow_forwardA) Although the magnetic field for each phase of a 3-phase induction motor is merely switching back and forth between north and south poles, the resultant magnetic influence from all phases sets up a rotating magnetic field to cut the rotor conductors. a) true b) false B) In a two-pole stator winding of a 3-phase motor, how many revolutions does the rotating tr) magnetic field make in one cycle of the electrical current? a) one b) 60 c) 3600 d) none of the abovearrow_forward
- Which of the following statements related to wind turbine types are true? Select one or more: a. The Savonius rotor will not start without an auxiliary motor b. In modern industrial-sized wind turbines, the most common type of turbine is a 3-bladed wind turbine. c. In a downwind turbine, the blades are on the (upper) side of the wind when viewed from the nacellarrow_forwardIn a three-phase induction motor the maximum torque occurs at 20% slip and the equivalent resistance of the secondary is 0.04Ω per phase. Find the equivalent load resistance and the load voltage and the load current. Output power is 20 kW.arrow_forwardExample 6–3. A 460-V, 25-hp, 60-Hz, four-pole, Y-connected induction motor has the following impedances in ohms per phase referred to the stator circuit: R, = 0.641 N R, = 0.332 N X = 1.106 N X, = 0.464 N XM = 26.3 N The total rotational losses are 1100 W and are assumed to be constant. The core loss is lumped in with the rotational losses. For a rotor slip of 2.2 percent at the rated voltage and rated frequency, find the motor's (b) Stator currentarrow_forward
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