to obtain contour plots

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Prashanth Nayak
Prashanth Nayak 2016-4-27
回答： Raghunath Rachabattuni 2023-6-30
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

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回答（2 个）

KSSV
KSSV 2016-4-27
编辑：KSSV 2016-4-27
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.
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KSSV
KSSV 2016-4-27
Friend...I am not aware what the problem is...I only edited the code mistake....

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Raghunath Rachabattuni
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.
PMSM Constraint Curves and Their Application - MATLAB & Simulink Example - MathWorks India
PMSM Drive Characteristics and Constraint Curves - MATLAB & Simulink - MathWorks India

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