# Hw11 - EE321 Spring 2010 Homework 11 Problem 1 Brushless DC Operation from a Voltage Source The flux linkage equations for a certain PMSM may be

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EE321 Spring 2010 Homework 11 Problem 1 – Brushless DC Operation from a Voltage Source The flux linkage equations for a certain PMSM may be expressed - + - + = ) 3 cos( ) 3 cos( ) 3 cos( ) 3 / 2 cos( ) 3 / 2 cos( cos 0 0 0 0 0 0 3 r r r m r r r m abcs ss ss ss abcs i L L L θ λ π where ss L , m , and 3 m are constants. The machine is wye-connected. Express the q- and d- axis flux linkage equations for the machine. Your answer should involve the q- and d-axis flux linkages, the q- and d-axis currents, and the parameters ss L , m , and 3 m . Recall + - + - = 2 1 2 1 2 1 ) 3 / 2 sin( ) 3 / 2 sin( ) sin( ) 3 / 2 cos( ) 3 / 2 cos( ) cos( 3 2 r r r r r r r s K Problem 2 – Machine Connections Why are brushless dc machines only rarely delta connected? Problem 3 – Brushless DC Operation from a Voltage Source
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## This note was uploaded on 04/08/2012 for the course ECE 321 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

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