Simulink To workspace issues R2017a

In my simulink model (svpwm_inverter_rlc_A)

I have a 6 input mux block whose output connects to a "To workspace" block i named "currvolt".

When i run my code, (The relevant segment is shown below):

**************************************************

% Although 5 periods used, plot for 6 periods to show input turnoff transients

mysimstop = num2str(6/(1e3*f2usekhz));

% Run the simulink mode

sim('svpwm_inverter_rlc_A','StopTime', mysimstop)

%sim('svpwm_inverter_rlc_A')

t = currvolt.time;

currA = currvolt.signals.values(:,1); % 1st variable is 1st column of values

voltA = currvolt.signals.values(:,2); % 2nd variable is 2nd column of values

currB = currvolt.signals.values(:,3);

voltB = currvolt.signals.values(:,4);

currC = currvolt.signals.values(:,5);

voltC = currvolt.signals.values(:,6);

********************************************

I do not get the "currvolt" structure in the Matlab workspace.

However when i replace "sim('svpwm_inverter_rlc_A','StopTime', mysimstop)" with

" sim('svpwm_inverter_rlc_A')" ,

i get the "currvolt" output in the Matlab workspace

Are there other options i need to include in my Matlab configuration?

Thanks

David

Answer 1

[Paul]

Don't know why those two sim commands would yield different results. In the first instance, I suspect that currvolt is inside ans, which is the output of the sim command, assuming you checked the box in

Simulation -> Model Configuraton Paramters -> Data Import/Export -> Single Simulation Output

Try

simdata = sim(...)

and see if currvolt shows up in simdata for both uses.

[David]

The checkbox "Simulation -> Model Configuraton Paramters -> Data Import/Export -> Single Simulation Output" is not checked.

when i tried your suggestion, it worked for

simdata = sim('svpwm_inverter_rlc_A','StopTime', mysimstop)

%simdata = sim('svpwm_inverter_rlc_A')

t = simdata.currvolt.time;

currA = simdata.currvolt.signals.values(:,1); % 1st variable is 1st column of values

voltA = simdata.currvolt.signals.values(:,2); % 2nd variable is 2nd column of values

currB = simdata.currvolt.signals.values(:,3);

voltB = simdata.currvolt.signals.values(:,4);

currC = simdata.currvolt.signals.values(:,5);

voltC = simdata.currvolt.signals.values(:,6);

However when i use "simdata = sim('svpwm_inverter_rlc_A')" instead of " simdata = sim('svpwm_inverter_rlc_A','StopTime', mysimstop) "

simdata is a 40651x1 double array which is simply the simulation time instances so i do not have access to currvolt.

Anyway. Thanks for your suggestion since i want to include the 'StopTime' parameter

simdata = sim('svpwm_inverter_rlc_A','StopTime', mysimstop)

works for me.

[Paul]

That's interesting. It sounds like the command

simdata = sim('svpwm_inverter_rlc_A')

is returning the time vector as the first output of the "backward compatible syntax" while

simdata = sim('svpwm_inverter_rlc_A','StopTime', mysimstop)

is using the single output. That's not how it's supposed to work according to the doc, at least as I read it.

I wonder if both commands would yield the same type of output if you check the box on Single Simulation Output.

[David]

This worked. After checking the "Single Simulation Output" and inserting the name "currvolt".

Thanks a lot.