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# 3100_assign1_prob - DALHOUSIE UNIVERSITY Faculty of...

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Unformatted text preview: DALHOUSIE UNIVERSITY Faculty of Engineering Department of Electrical and Computer Engineering ECED 3100 Electromechanics Assignment 1 ’91 i061 moan Instructor: T.A.Little DUE i Sept m 1) A 1.5 kw heater and a 5 hp induction motor are operated from a 200 V, three- phase supply. The motor has a full lead efﬁciency of 80% and a full load power factor of 0.85. What is the motor current and what is the total supply 4} current? {1525.150} A solid 1400 kg steel ﬂywheel has a distaste: of 1m and a thiclmess of 0.225 m a) What is the moment of inertia b) What is the kinetic energy stored in the rotating mass when spinning at 1800 rpm c) What horsepower motor (from the WEG data sheet) would be required to bring this inertia up to speed within the allowable hot locked rotor time. (asstnne the accelerating torque available is constant at the locked rotor level) I I-I-I—--l-l—-u-——-— T I't—Ilﬁlnrn 'IIIDIIHI C' _(raoorhv A large reel of paper installed at the end of a paper machine has a diameter of LBm, a length of 5.6m and a moment of inertia of 4500 leg-n12. It is driven by a directlyr coupled, variable—speed DC motor turning at 120mm. The paper is kept under a constant tension of 5000 N. a) Calculate the power (in hp) required from the motor to turn the reel at 120 . rpm. b) If the speed has to be raised from 120 rpm to 160 rpm in 5 seconds. calculate the torque that the motor must develop during this interval. c) Calculate the required motor power after it has reached 160 rpm. The electric motor in a street car develops a power output of 30 hp at 1200 rpm as the vehicle moves up a hill at a speed of 30 miles per hour. Assume the gearing losses are negligible. calculate: a} The torque developed by the motor b) 'Ihe force opposing the motion of the bus. mununuuﬂﬂ-Emmmmwmmmmmmmmm EEEEEW. mmhmmmwwm.-. mm. M.- - Wm; ...ﬁﬂﬂ........EEEEEIIIW“...-“IIEI- an m u I: .r r r In arm mm mm III I m m - HIEIIIIIIIHEIIIII.3 1H H H:H1HHHH :HH .Hu w:mﬂ .Hmn EJMMI ”MM mhmmmwwmm Emu...“ mmmmmmmmw. mmmmm my I .II Emu mans... “mum -nnmﬂ. .. 5H MH Hui... Jinn. mun...” .ﬂﬂﬂﬁmnﬂ. mmw .NH mum-Hm wunm Hnﬂr man ﬂan...“ H at?“ It?! ELM I.” IL l H.“ I. a 5.“ [LEE H I.” I.” .8: I.” IL” I.” I.“ I. II I. IE I.” ﬂ' H I.“ III-III Ill-ll III. In. Mn. ﬂu. ﬂﬂﬂnﬂﬂ ﬁmﬁﬂhﬂhﬂ. Jﬁﬁﬂ. :ﬂmm WWI-ﬂ. mmmmmﬁmw mu. mmmmmmmmm nunzu any” mrun "an" r “1.21.... ”WEEK"? . IIIIII. :ﬁﬁ WWW. .- _ﬂ_.__ilﬁﬂﬂiﬂlll- ... _ mu...- ”...“... 23.3.1.2 121. - H .. - ...- ... L. “ .... JII I Ill! 5...... {...—I ......F. “”529.“ tr? Jinn-Jaw...” .r “I: 1!. q. fc ...M ........I..- .II IIIII -I .II- II!“ . unlﬂ ..I.-.IIII.........I-IEIH-m. ...... .... .IIIIE III rman' ' HZ: I #- Mﬂﬂl PeFfmoW .. 'ﬂ'u-u " ... ... mi ... ... Err—Jr. Try... Eﬂ3 1: 1:" '11. ""_-.. _.'..- . . II- _. ..E. l' - .- IIrLII. III—I.I..I .II..|||I .I II In: I I r IEIIIIII-III ...Irlrluu I . |.I.I.lr-I-rlll-I ..l. ..Il..l. .l .l. ...-....Illrlrl n . .1I-.I.L1ILIII:|..I1.II .- iar-III! .I II .. ...-I .- . ... ...
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3100_assign1_prob - DALHOUSIE UNIVERSITY Faculty of...

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