How to draw efficiency map contour of a motor?

Given vectors of Speed, Torque and Efficiency. How do I draw the contour for efficiency map of the motor in matlab?

[Yogya Khanna]

okay but where are the given vectors ?

[Yogya Khanna]

could you please share the vectors 

[Yogya Khanna]

Could you give me the vector speed, torque and efficiency code

[Praveen Kumar]

Hi, vectors you can get from datasheet of the motor or from technical papers.

[Shraddha Walvekar]

How can we create lookup table 2D (obsolete) using electric motor efficiency map?

[Kundan]

Hello may any one guide me how to get builtin simulink model of PMSM based 3 phase inverter

Answer 1

[KSSV]

x0 = min(speed) ; x1 = max(speed) ; nx = 100 ;
y0 = min(torque) ; y1 = max(torque) ; ny = 100 ;
x = linspace(x0,x1,nx) ;
y = linspace(y0,y1,ny) ;
[X,Y] = meshgrid(x,y) ;
Z = griddata(speed,torque,efficiency,X,Y) 
contour(X,Y,Z)

Where speed, torque and efficiency are vectors.

[Praveen Kumar]

Hi, thanks for the answer. Now i have obtained the contour and i want to extract the co-ordinates of the plot.

    % code
load('motorchar')
x0=min(omega);  x1=max(omega); nx=100;
y0=min(T);  y1=max(T); ny=100;
x=linspace(x0,x1,nx);
y=linspace(y0,y1,ny);
[X,Y]=meshgrid(x,y);
Z=griddata(omega,T,eff,X,Y);
contourf(X,Y,Z);
colorbar;

I have obtained the contour.

Now the contour is a function(speed,torque,efficiency). I want to extract or obtain the co-ordinate/value of efficiency for random speed and torque. Please let me know how to do it. (The values that can be seen using the cursor, but I want to obtain this in a program)

[Praveen Kumar]

Thanks anyways. I got this one.

It was the same 'griddata' command to obtain the levels of certain X and Y.

[Saber Fadul]

Hi Praveen Kumar, I tried to plot the IM efficiency map contour but I could not. I think I missed something, would you share the code, please.

[Praveen Kumar]

 Code example:

 load 'speedprofile'
load 'motorstat'
x0=min(omega);  x1=max(omega); nx=1000;
y0=min(T);  y1=max(T); ny=1000;
x=linspace(x0,x1,nx);
y=linspace(y0,y1,ny);
[X,Y]=meshgrid(x,y);
Z=griddata(omega,T,eff,X,Y);
figure;
contourf(X,Y,Z);
h=contourf(X,Y,Z);
colorbar;

[Yogya Khanna]

hey could you send me the code in full. I cannot understand the use of grid data here and how would efficiency be plotted

[Praveen Kumar]

You need to have three data; Speed , torque and efficiency which are obtained from motor data sheet. I will attach the full code in a day or two.

[Soumik Ghosh]

How, did you get the efficiency values ?

[Soham Dange]

Can you describe the the data required to plot this curve?

Is it standard load test data where load is increased till motor stalls or any other test data?

[Ahmed Ali RM]

How to do that using lookup table?

[Praveen Kumar]

@Soumik Ghost Efficiency values can be obtained from the datasheet of the motor or by load test if you have the motor and required instruments.

[Praveen Kumar]

@Soham I have used the standard test data provided by the manufacturer. I am not fully aware about the load test method used.

You will need a vector of speed, torque and efficiency data (maybe increasing speed or torque. Either dependent on manufacturer datasheet or measure these data from motor load test).

[Praveen Kumar]

@Ahmed Ali RM

I have not tried using look up table. But, I think you can easily do it. Try some lookup table examples.

[Shiva Haresh Dhanasekaran]

@Praveen Kumar

could you please share the example vector data for speed, torque and efficiency. Thank you in advance

[Praveen Kumar]

Hi,

Please find the code and example of vectors of speed, T and eff in the .mat file.

[wafa mezzi]

hi i have my own measurments of speed and torque of a motor and their corresponding efficiency is it possible to plot them with this efficiency map when i try to do that i get this error

Error using griddata (line 110)

X and Y must be same length as Z or the lengths of X and Y must match the size of Z.

could you help me please

[Praveen Kumar Nambisan T M]

As the error says, I think X and Y lengths are not of same size.

[wafa mezzi]

hi i'm attaching here the excel files could you check them please i made measurement of each value of the torque and the speed and i plot the correspending efficiency value for them. the arrays are arranged in an ascendending order for a ramp input ? thanks

[Praveen Kumar Nambisan T M]

Okay. I will check and let you know.

[Dante Chen]

I really want a similar plot, can anyone give me the data so I can do it in matlab, it would be better if using lookup table. Please! I really appreciate it

[Afaf]

have you find the code to plot the efficiency map? i need it also if you can share

[DGM]

The answer has already been given. If you need something different, then it's up to you to describe what data you actually have and what specifically you want to do with it.

Answer 2

[Kundan]

Hello dear, please guide me. I want to draw efficieny map, I have toque, speed data but no efficieny data. How can I get the efficieny data in Simulink model. Please gudie me.

[Praveen Kumar]

You cant get efficiency data from Simulink. You need to obtain the data from datasheets or from experiments.

[Kundan]

Dear parveen kumar, I m facing difficulty to calculate the efficiency, so need your guidance,. May you give me your whatsapp no or email so that I may forward my simulink model to you. Please dear sir guide me

[Praveen Kumar]

Sorry, at present wont be able to look at your model. If you want to plot the efficiency map, please check above example. You need speed, torque and efficiency data.