quiz8f

# quiz8f - “’VBVW\k"_‘ DHCK 4 ” Last ‘ nit ’...

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Unformatted text preview: “’VBVW \k."\_‘ DHCK- \ 4; ”% Last ‘ nit; ’ 1. A 3-phase, 8 pole, 50 Hz. induction motor runs at 645 rpm when developing maximum developed torque Tdm. Neglecting the stator impedance determine: a) The starting torque in terms of Tdm and. b) the torque at a slip of 0.03 in terms of Monday Apr. 9. 2001 RE 381 (.13. Tdrmx mg : 120x51 : 7S? vt/>a \$1, =jgmwoé’ﬁrt oi/z/ 5 7ft) meat - 2:5; : 9 M W = 0-27qr ' L L L 2. 7d ”A“ S + §L_-w , l 4 O Ia KA'MW" . . 7 gag ”7% Tm‘ 7d 00} ago-03,1 0J4! __ o 467\ 751”“ 0~03L+ 0H4" /7:”‘\ W W ‘“‘ “ ~-\-\ 2. A 4-pole, 3-phase, wound rotor induction motor has a wye-connected rotor with an impedance of 0.1 + jO.5 ohm per phase. What is the slip at maximum torque rdm‘? How much additional resistance must be inserted in the rotor Circuit per phase for the starting torque to be equal to half the maximum developed torque Tdmx. Neglect stator impedance. u S’LLF‘IA/i >nﬁ0xc‘W,,,,ﬂ Ha/ie/ S/é : [21_ 7" Tdﬂza-rt : Qty/2w)“ . Ark g g a»: 1!; 5 : I TAS'l/la/y'é _ .L 1: 2 5‘;th I T p 1 at mg /+ :4th Hit“; 4c 4M ~ 0 \$4M. : 4- LI 1". /5 ~— 1} '2‘. q— t f: '4 2t 5 x Z. r: g {L : 3 '73 2' Q’ n 0. 268 ...
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