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Unformatted text preview: = rm r br P N P w 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 and electrical rotor position r . Problem 4 Back EMF A PMSM has a radius of 0.1 m and a length of 0.05 m. The conductor density of the a-phase of a PMSM is given by ) 4 sin( 200 sm as n = With no stator current, the B-field due to the PM on this machine may be expressed ) 4 sin( rm B = The mechanical rotor position is given by t rm 100 = Compute the voltage across the a-phase at t=0.1 s. Problem 5 QD Transformation Starting with abcs T abcs cs cs bs bs as as i v i v i v P i v = + + = Show that ( 29 s s r ds r ds r qs r qs i v i v i v P 2 2 3 + + =...
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- Spring '08