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init_geometry_2.m
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init_geometry_2.m
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%%% Create Motor Geometry in FEMM %%%
%%% This version puts an additional layer of air behind the rotor and steel
%%% back-iron. Hopefully makes results more accurite for teh saturated
%%% back-iron case.
function theta_elec = init_geometry_2(g, theta, id, iq, hidewindow)
if(nargin<5)
hidewindow = 1;
end
%%% motor geometry struct g, rotor angle theta, d-axis current id, q-axis
%%% current iq
delta_theta_rm = theta;
theta = theta/g.r.ppairs;
openfemm(hidewindow); % Do not show the window, makes it much faster
main_resize(1200, 900);
newdocument(0); % 0 = magnetics, 1 = electrostatics, etc..
Freq=0;
mi_probdef(Freq, 'millimeters', 'planar', 1.e-8, g.depth, 30);
% Draw the Stator Teeth %
addnodelist_group(g.s.pointlist, 'stator', 1);
addsegmentlist_group(g.s.segmentlist, 'stator', 1, 1);
addarclist_group(g.s.arclist, 'stator', 2, 1);
mi_selectgroup(1);
mi_mirror(0, 0, g.s.p7(1), g.s.p7(2));
mi_selectgroup(1);
mi_copyrotate([0, 0], -radtodeg(g.s.theta), g.n_s - 1);
% Draw Stator Back-iron %
% Draw air behind stator back-iron %
addnode_group(g.s.boundary_point, 'stator_backiron', 3);
p1 = g.s.boundary_point + .2*(g.s.boundary_point - g.s.p1);
R_bd_1 = norm(p1);
addnode_group(p1, 'sa', 3);
mi_selectgroup(3);
mi_copyrotate([0, 0], -radtodeg(g.s.theta*g.n_s), 1);
R = [cos(g.s.theta*g.n_s) -sin(g.s.theta*g.n_s); sin(g.s.theta*g.n_s) cos(g.s.theta*g.n_s)];
p2 = R'*g.s.boundary_point';
addarc_group(g.s.boundary_point, p2', [0, 0], 'stator_backiron', 10, 3);
addarc_group(p1, [R'*p1']', [0, 0], 'stator_air', 10, 17);
addsegment_group(g.s.boundary_point, p1', 'stator_air_side', 1, 18)
addsegment_group(p2', [R'*p1']', 'stator_air_side', 1, 18)
R = [cos(g.s.theta/2) -sin(g.s.theta/2); sin(g.s.theta/2) cos(g.s.theta/2)];
stator_air_label_pt = R'*[mean([g.s.boundary_point; p1])]';
% Draw rotor %
addnodelist_group(g.r.pointlist, 'rotor', 2);
addsegmentlist_group(g.r.segmentlist, 'rotor', 1, 2);
addarclist_group(g.r.arclist, 'rotor', 10, 2);
mi_clearselected();
mi_selectgroup(2);
mi_mirror(0, 0, g.r.p2(1), g.r.p2(2));
mi_selectgroup(2);
mi_copyrotate([0, 0], -radtodeg(g.r.theta), g.n_p-1);
mi_selectgroup(2);
mi_moverotate([0, 0], -radtodeg(theta));
% Draw rotor back-iron %
% Draw air behind rotor back-iron %
R = [cos(g.r.theta/4) -sin(g.r.theta/4); sin(g.r.theta/4) cos(g.r.theta/4)];
R1 = [cos(theta) -sin(theta); sin(theta) cos(theta)];
R2 = [cos(g.r.theta*g.n_p+theta) -sin(g.r.theta*g.n_p+theta); sin(g.r.theta*g.n_p+theta) cos(g.r.theta*g.n_p+theta)];
R3 = [cos(g.r.theta*g.n_p) -sin(g.r.theta*g.n_p); sin(g.r.theta*g.n_p) cos(g.r.theta*g.n_p)];
p1 = R1'*g.r.boundary_point';
p2 = R2'*g.r.boundary_point';
p3 = p1 + R1'*(g.r.boundary_point-[0, norm(g.r.p5)])';
p4 = R3'*p3;
R_bd_2 = norm(p3);
rotor_air_label_pt = R'*[mean([p1';p3'])]';
addnode_group(p1, 'rotor_backiron', 4);
addnode_group(p3, 'rotor_air',20);
mi_selectgroup(4);
mi_copyrotate([0, 0], -radtodeg(g.r.theta*g.n_p), 1);
addarc_group(p1', p2', [0, 0], 'rotor_backiron', 10, 4);
addarc_group(p3', p4', [0, 0], 'rotor_air', 10, 19);
addsegment_group(p1', p3', 'rotor_air_side', 1, 20)
addsegment_group(p2', p4', 'rotor_air_side', 1, 20)
% Add Materials %
mi_getmaterial('Air'); % air
mi_getmaterial(g.r.magnet_type); % permanent magnet
mi_addmaterial('wire', 1, 1, 0, 0);
%mi_getmaterial('Hiperco-50'); % armature material: Cobalt Iron
mi_getmaterial(g.s.material); % Stator Laminations
mi_getmaterial(g.r.backiron_material); % Rotor Back Iron
mi_modifymaterial(g.s.material, 9, 0); % Set stator lamination stacking factor
mi_modifymaterial(g.s.material, 6, g.s.t_lam);
mi_modifymaterial(g.s.material, 8, g.s.stacking_factor);
% Add Magnet Labels %'
R3 = [cos(g.r.theta) -sin(g.r.theta); sin(g.r.theta) cos(g.r.theta)];
p1 = R1'*mean([g.r.p3; g.r.p5])';
m_sign = 1;
theta_m = atan2(p1(2), p1(1));
for x = 1:g.n_p
addblocklabel(p1,g.r.magnet_type, 0, '<None>', '<None>', radtodeg(theta_m), 12, 0);
p1 = R3'*p1;
m_sign = -m_sign; % flip north/south magnets
theta_m = atan2(m_sign*p1(2), m_sign*p1(1));
end
% Add Phase Currents %
% Apply D/Q axis currents, transform to phase currents %
abc = @(theta) [cos(-theta), sin(-theta), 1/sqrt(2);
cos((2*pi/3)-theta), sin((2*pi/3)-theta), 1/sqrt(2);
cos((-2*pi/3)-theta), sin((-2*pi/3)-theta), 1/(sqrt(2))];
theta_a = atan2(g.s.p6(2), g.s.p6(1)); % Phase A center angle
p1 = R1'*mean([g.r.p3; g.r.p5])';
theta_m = atan2(p1(2), p1(1)); % Magnet angle
theta_elec = (theta_m - theta_a)*g.r.ppairs - pi/2;
abc_transform = abc(theta_elec); % Invers dq0 transform
i_abc = abc_transform*[id; iq; 0];
i_phase = [i_abc(1), i_abc(2), i_abc(3)];%j*[cos(-theta); -cos(theta + 2*pi/3); -cos(theta-2*pi/3)];
%i_phase = iq*[-.5; -.5; 1];
g.s.imap = g.s.imap;
mi_addcircprop('A', i_phase(1), 1);
mi_addcircprop('a', -i_phase(1), 1);
mi_addcircprop('B', i_phase(2), 1);
mi_addcircprop('b', -i_phase(2), 1);
mi_addcircprop('C', i_phase(3), 1);
mi_addcircprop('c', -i_phase(3), 1);
% Add Phase Labels %
R4 = [cos(g.s.theta), -sin(g.s.theta); sin(g.s.theta), cos(g.s.theta)];
p1 = mean([g.s.p4; g.s.p9; g.s.p6; g.s.p5])';
p2 = mirror_point_about_line(p1, g.s.p6);
for x = 1:g.n_s
addblocklabel(p1,'wire', 0, '<None>', g.s.imap(2*x-1), 0, 11, 1);
p1 = R4'*p1;
end
for x = 1:g.n_s
addblocklabel(p2,'wire', 0, '<None>', g.s.imap(2*x), 0, 11, 1);
p2 = R4'*p2;
end
% Add steel and airgap labels %
p1 = mean([g.s.p5; g.s.p6; g.s.p7; g.s.p8])';
p2 = R1'*mean([g.r.p2; g.r.p3])';
p3 = mean([g.s.p2; g.s.p3; g.s.p9]);
p4 = rotor_air_label_pt;
p5 = stator_air_label_pt;
addblocklabel(p4,'Air', 0, '<None>', '<None>', 0, 0, 0); % airgap
addblocklabel(p1,g.s.material, 0, '<None>', '<None>', 0, 1, 0); % stator steel
addblocklabel(p2,g.r.backiron_material, 0, '<None>', '<None>', 0, 2, 0); % rotor back iron
addblocklabel(p3,'Air', 0, '<None>', '<None>', 0, 0, 0); % airgap
addblocklabel(p5,'Air', 0, '<None>', '<None>', 0, 0, 0); % airgap
% Draw Boundaries and Set Boundary Conditions %
muo = pi*4.e-7;
mi_addboundprop('Asymptotic_1', 0, 0, 0, 0, 0, 0, 1/(muo*1e-3*R_bd_1), 0, 2);
mi_addboundprop('Asymptotic_2', 0, 0, 0, 0, 0, 0, 1/(muo*1e-3*R_bd_2), 0, 2);
R5 = [cos(g.n_s*g.s.theta), -sin(g.n_s*g.s.theta); sin(g.n_s*g.s.theta), cos(g.n_s*g.s.theta)];
p1 = [0; g.r_airgap];
p2 = R2'*p1;
p3 = R5'*p1;
p4 = R1'*p1;
mi_addnode(p1);
mi_addnode(p2');
mi_addnode(p3');
mi_addnode(p4');
addsegment_group(g.s.p8, g.s.p1, 'stator_boundary', 1, 6)
addsegment_group([R5'*[0;g.s.r3]]', [R5'*[0;g.s.r1]]', 'stator_boundary', 1, 6)
addsegment_group(p3, [R5'*[0;g.s.r1]]', 'airgap_vertical_1', 1, 7)
addsegment_group(g.s.p1, p1, 'airgap_vertical_1', 1, 7)
addsegment_group([R1'*[0;g.r.r3]], [R1'*[0;g.r.r2]], 'rotor_boundary', 1, 8);
addsegment_group([R2'*[0;g.r.r3]], [R2'*[0;g.r.r2]], 'rotor_boundary', 1, 8);
addsegment_group(p4, [R1'*[0;g.r.r2]], 'airgap_vertical_2', 1, 9);
addsegment_group(p2, [R2'*[0;g.r.r2]], 'airgap_vertical_2', 1, 9);
addarc_group(p1', p4', [0, 0], 'airgap_horizontal', 10, 10);
addarc_group(p3', p2', [0, 0], 'airgap_horizontal', 10, 10);
% Airgap BC
mi_clearselected()
mi_addboundprop('airgap_radius', 0, 0, 0, 0, 0, 0, 0, 0, 5);
mi_selectgroup(10);
mi_setarcsegmentprop(10, 'airgap_radius', 0, 10);
mi_clearselected()
mi_addboundprop('airgap_vertical_1', 0, 0, 0, 0, 0, 0, 0, 0, 5);
mi_selectgroup(7);
mi_setsegmentprop('airgap_vertical_1', 1, 0, 0, 7);
mi_clearselected()
mi_addboundprop('airgap_vertical_2', 0, 0, 0, 0, 0, 0, 0, 0, 5);
mi_selectgroup(9);
mi_setsegmentprop('airgap_vertical_2', 1, 0, 0, 2);
% Stator Yoke BC
mi_clearselected()
mi_selectgroup(3);
mi_setarcsegmentprop(17, 'Asymptotic_1', 0, 1);
% Rotor Backiron BC
mi_clearselected()
mi_selectgroup(4);
mi_setarcsegmentprop(19, 'Asymptotic_2', 0, 2);
% Stator Side BC
mi_clearselected()
mi_addboundprop('stator_boundary', 0, 0, 0, 0, 0, 0, 0, 0, 5);
mi_selectgroup(6);
mi_setsegmentprop('stator_boundary', 1, 0, 0, 1);
mi_clearselected()
mi_addboundprop('stator_air_side', 0, 0, 0, 0, 0, 0, 0, 0, 5);
mi_selectgroup(18);
mi_setsegmentprop('stator_air_side', 1, 0, 0, 1);
%Rotor Side BC
mi_clearselected()
mi_addboundprop('rotor_boundary', 0, 0, 0, 0, 0, 0, 0, 0, 5);
mi_selectgroup(8);
mi_setsegmentprop('rotor_boundary', 1, 0, 0, 2);
mi_clearselected()
mi_addboundprop('rotor_air_side', 0, 0, 0, 0, 0, 0, 0, 0, 5);
mi_selectgroup(20);
mi_setsegmentprop('rotor_air_side', 1, 0, 0, 2);
mi_zoomnatural;
end