Typically commas indicate a pause in a sentence indicating another thought is starting.
None of these are required. I would only tend to use commas in a case where you really wish to indicate an idea break. Here's an example.
In short be careful with commas in these cases.
Lack—or overuse—of punctuation (especially commas) can alter the meaning and/or the result of ambiguity.
Ambiguous sentences are hard to understand and can be misinterpreted, thus potentially altering the meaning of the sentence in a drastic way.
Here's an example of a sentence that would be ambiguous without the use of a comma or two.
First the sentence without commas.
Rachael finds inspiration in cooking her family and her dog.
Without commas it seems she is cooking her family and her dog and this inspires her.
Let's add commas in here.
Rachael finds inspiration in cooking, her family, and her dog.
Now we can see the separation of ideas making it clear that she finds inspiration in 3 items.
and her dog
So commas make a sentence clearer when ideas might blend together. They help you have the reader pause when reading the sentence giving the sentence a clear understanding of what is meant.