UNIVERSITY Inspiring Niinds Department of Electrical & Computer Engineering ECED

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UNIVERSITY Inspiring Niinds Department of Electrical & Computer Engineering ECED 4102 Electromechanicsl Term Test Time allowed 1.5 hours A two-sided cheat sheet is allowed. November 5, 2014 Attempt all 3 Problems Problem 1 [40 points] in your calculations. The cross Consider the magnetic co shown in Figure (1). Include both core and air gap area core is Ac 6 cm and of mean length le-30 cm. of the a- Determine the number of turns N and the air gap length g so that inductance is 24 mH and so that the inductor can operate at peak currents of 8 A without saturating. Assume that saturation occurs when the peak flux density in the core exceeds 1.7 T and that, below saturation, the core has permeability 250o Ho Mio pointsl b- For an current of 10 A, determine the magnetic stored energy in the air gap and the magnetic energy l [10 points stored in the core. c- Determine the value of the inductance Lif the value of the air gap length is g o.9 mm, core length 12 cm, Ac 1.1 cm and N 520 turns, with core has permeability H 2500 Ho [10 points] d- Calculate the core flux density and the inductor flux linkages for a winding current of 1.5 A. [10 points! Core: mean length l N-turn area A coil relative permeability Figure (1) Magnetic core for Problem l

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PLEASE INCREASE THE TIME

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