Simulink vector space alpha beta transformation

[Cdz]

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The model:

The goal:
1. Create a three phase voltage
2. Do a alpha-beta transformation
3. Do a Cartesian to Polar transformation
4 Check the output angle
The expected result:
Since the space vector rotates counter-clock wise the angle should from 0 to 180^o and drop to -180^o(instantly!) and rise again and repeat.
But the actual result is:

As you can see it does not reach 180 or -180 sometimes..I need your help.

 

[Cdz]

I changed three phase voltage generation part to a Three Phase Sine Generator and the angle output is as I expected.
So the problem lies in three phase voltage generation.
But i can not figure out how that is wrong. Help!

 

[Cdz]

Problem solved. The problem is that the scope is running with too low a sample rate. I changed the sample rate from 0.01(default) to 0.00002 and the result is good.