to obtain contour plots

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Prashanth Nayak
Prashanth Nayak on 27 Apr 2016
Hi,
I am trying to obtain the IPMSM Flux weakening characteristics with matlab code. I could able to get required circle and ellipse but i could not get the black line in the pic which i have attached. Here is my code. Can u please rectify the problem.
Thank you
matlab code:
clear all;
close all;
clc;
x=0;
y=0;
r=355;
hold on
th = 0:pi/50:2*pi;
xunit = r*cos(th)+x;
yunit = r*sin(th)+y;
h=plot(xunit, yunit,'blue');
axis('equal');
hold on;
[m,n]=meshgrid(-500:500,-500:500);
p=(((m+299).^2)/5814.25+((n.^2)/2517.2));
contour(m,n,p,10);
[c,h]=contour(m,n,p,10,'red');
%clabel(c,h);
hold on;
Ld=(0.349e-3);
Lq=(0.806e-3);
[m,n]=meshgrid(250:-350, 187:353);
t=0.6276*n-(0.000457*m*n);
contour(m,n,t,10);
[c,h]=contour(m,n,t,'black');
%clabel(c,h);
hold off;
grid on;
regards, Prashanth

Answers (2)

KSSV
KSSV on 27 Apr 2016
Edited: KSSV on 27 Apr 2016
change
[m,n]=meshgrid(250:-350, 187:353);
t=0.6276*n-(0.000457*m*n);
to
[m,n]=meshgrid(250:-1:-350, 187:353);
t=0.6276*n-(0.000457*m*n);
Though black lines appear it is not like the attached png.
  3 Comments
KSSV
KSSV on 27 Apr 2016
Friend...I am not aware what the problem is...I only edited the code mistake....

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Raghunath Rachabattuni
Raghunath Rachabattuni on 30 Jun 2023
You can use the commandline utilities that are shipped with Motor Control Blockset. Please refer to the following links to explore the constraint curves and also how to use them.

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