as you can say w(t)= 2*pi*fr(t)*t

so you can used one gain block and put the valu 2*pi*fr(t)

where fr(t)=50Hz or 60 Hz

and you can used "clock" these clock blok gives the time "t"

clocl out signal are given to the gain input and gain out signal is achived

2*pi*fr(t) *t

you can referd this simulation:

https://in.mathworks.com/matlabcentral/fileexchange/71276-abc-to-alpha-beta-to-dq-abc-to-dq-transformation

in this simulation two method are showing for w(t)

thank you...

Dear Sofia,

You can use a ramp as a timer.

go to Simulink/sources and choose Ramp.

then set its slope as 1.

now you can use it as a timer or t.

Dear Sofia!

You can use block of "Clock" from library Simulink -> Sources. The Clock block outputs the current simulation time at each simulation step.

Regards.

use the clock block