Creating Controllable Rotational Friction

[Sunrise1]

Hi,

1- I've coupled a load(consist of rotational inertia and rotational friction) to an induction 3 phase motor.

2- The motor takes rotational speed of load and gives torque to the load.( like a real coupled motor an load )


3- I want to change the "viscous friction coefficient" value dynamically during the simulation time,(for example similar to ramp), and see the motor response.

4- I used a variable and I changed it in simulink but changing was not useful because Simscape initializes with the primary value of that variable and changing is ineffective(also MATLAB specified you couldn't control simscape models.)

Is there anyway to make a controllable load like this?

I've attached the primary model that i want to control.(not contains #3 discussion subject).

Regards.

 

[FeX32]

If you simulate the motor with an S-function it may be easier to change the variables as you wish.
This way you can add one extra input, the variable you wish to change in real time.

Of course, you have to know the DE of the motor ect. to do this. I am not a huge fan of interfacing everything for the user (you seem to be using a GUI of sort), as it defeats some of the purpose (not all) for using MATLAB.


Fe

 

[Sunrise1]

If you simulate the motor with an S-function it may be easier to change the variables as you wish.
This way you can add one extra input, the variable you wish to change in real time.

you mean I've to make an S-function to get the input torque and due to rotational inetria and friction, returns the speed.
I'm not familiar with S-functions but if there is noway, i should use S-function.

thx FeX

 

[FeX32]

no problem


Fe