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Homework 04

Homework 04 - Spring2011 Homework 4 Due 4.1(25 pt A shunt...

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ELEN 3441 – Fundamentals of Power Engineering Spring 2011 Page | 1 Homework 4 – Due March 18, 11 4.1. (25 pt.) A shunt DC motor has the following characteristics: P rated = 30 hp; I L ,rated = 110 A V T = 240 V; N F = 2700 turns per pole n rated = 1200 rpm; N SE = 12 turns per pole R A = 0.19 Ω; R F = 75 Ω R S = 0.02 Ω ; R adj = 100 to 400 Ω Rotational losses at full load 3550 W Magnetization curve is shown in Figure 4-1: Figure 4-1 The equivalent circuit of the motor is shown in Figure 4-2:

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ELEN 3441 – Fundamentals of Power Engineering Spring 2011 Page | 2 Figure 4-2 a) If the resistor R adj is adjusted to 175 , what is the rotational speed of the motor at no- load conditions and assuming no armature reaction? b) If R adj can be adjusted from 100 to 400 , what are the maximum and minimum no-load speeds possible with this motor? c) What is the starting current of this machine if it is started by connecting it directly to the power supply V T ? How does this starting current compare to the full-load current of the
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Homework 04 - Spring2011 Homework 4 Due 4.1(25 pt A shunt...

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