hw13 - EE321 Spring 2008 Homework 13 Problem 56 –...

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Unformatted text preview: EE321 Spring 2008 Homework 13 Problem 56 – Rotating MMF Using the configuration we studied in class (Figure 5.2-1 in text), the stator currents of a 4 pole machine are given by ) 200 cos( 50 ) 200 sin( 50 t i t i bs as − = = The speed of the machine is 500 rpm in the CW direction. What is the physical speed and direction of the stator MMF as viewed from the rotor. Problem 57 – Phase Inductance Suppose the winding function of a-phase of the stator is given by ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ = sm s as P N P w φ 2 cos 2 and the winding function of the b-phase of the rotor is given by ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ = rm r br P N P w φ 2 sin 2 Express the mutual inductance between the a-phase stator and b-phase rotor windings in terms of s N , r N , P , the rotor radius r , the rotor length L , the airgap g , the permeability of free space μ and electrical rotor position r θ . Problem 58 – QD Transformation Show in detail that ms s s T sr s r L K L K = − 1 ' where ' sr L is given by (5.3-48) and is given by (5....
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This note was uploaded on 09/22/2011 for the course ECE 321 taught by Professor Staff during the Spring '08 term at Purdue.

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