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quiz8e

# quiz8e - Wednesday l A 3-phase 50 HP 8 pole 460 V 60 Hz...

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Unformatted text preview: Wednesday, March 27, 2002 l. A 3-phase, 50 HP, 8 pole, 460 V, 60 Hz. induction motor operates at 873 rpm. (a) What is the synchronous speed? (b) What is the slip? (c) What is the rotor frequency? ((1) What is the shaft torque? (e) What is the speed of the rotor ﬁeld with respect to the rotor? / @1740‘ 7300W . 1‘ .- J ' [\:—.. 13° (90 = GOO/Pm , Slp‘ Nc' NW _ M x '03/ @3 ), iri’iﬁr page 21% H; x/:6 “404/33 Era—I": "Enhém _ 37300 ,, t n w an. - 2:323 We : '3 ; f I x r I .' , ,{ - (— {1' €730 “gy__. ["r'if 'L? / .fgcv w! [0,). F __ q OfPW. 2. If the above motor has rootg’tliénal loss of 100'(§:\/}atts and total stator loss of 3000 watts ﬁnd the following: (a) Developed power: Pd. (b) Air gap power, Pas. (c) Total rotor copper loss, PRCL. (d) Input power to the motor. (e) Input current if the power ,7 factor is 0.8 lagging ﬁat: - IOOQ PsltaHf‘Pro-r 37300-1- [ODO- - gggmﬁj _ ﬂ. 2.“ 39300 _ rm] \Po‘ﬁ ~ ’_ ._ l" 0'5 - 39 “W? J W545 Pm f a. ~ W {PM Mia: .03 394%9e' })8%a49 ...
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