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From: Antonio Frello on 22 Sep 2009 05:12
Hi!
I'm implementing a model in Simulink of a device that needs an AC motor. In order to do that I'm using the "Induction Motor" model that is inside the tool SimElectronics, but I have some problems with it.
First of all, when the simulation start the motor is already in regime condition. What have I to set in order to see the transitory?
Besides that, I need also to change the input of the motor (3-phase voltage), but it is passed to the model as a parameter and I cannot find a way to change it during the simulation.
Could someone help me?

Thanks in advance,
Antonio
From: Gorkem on 22 Sep 2009 18:01
I think that if you would have buillt your own model, it is more beneficial. However, i am guessing that you can define input voltage parameter as variable name like 'x' that we are going to define in workspace and you can change its value using matlab function or something else .
From: Arnaud Miege on 23 Sep 2009 16:32

"Antonio Frello" <fre.anto(a)gmail.com> wrote in message
news:h9a4d3$d11$1(a)fred.mathworks.com...
> Hi!
> I'm implementing a model in Simulink of a device that needs an AC motor.
> In order to do that I'm using the "Induction Motor" model that is inside
> the tool SimElectronics, but I have some problems with it.
> First of all, when the simulation start the motor is already in regime
> condition. What have I to set in order to see the transitory?
> Besides that, I need also to change the input of the motor (3-phase
> voltage), but it is passed to the model as a parameter and I cannot find a
> way to change it during the simulation.
> Could someone help me?
>
> Thanks in advance,
> Antonio

Single phase AC machines need some mechanism to ensure they can start OK -
if the rotor happens to be in the wrong position, there is not torque to get
it going. This is why the documentation says that "The block does not model
the starting mechanism for a single-phase induction motor". Three phase
machines don't have this problem - there is always a torque regardless of
rotor angle.



You'll need to create your own model if you want to model the AC supply
separately. I think however, that you should be using SimPowerSystems
instead of SimElectronics, as it's more appropriate for three-phase systems.



HTH,



Arnaud


From: Antonio Frello on 30 Sep 2009 06:47
Thank you,
I decided to use the SimPowerSystems tool that has the "Asynchronous machine" model, it is perfectly what I was looking for.

Best regards
Anto
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