I have a problem about animation planetary gearbox

I have a planetary gear

There is a movement around its axis

and add motion around the sun gear

The first, I create rotate for planetary gear revolving around its axis.

then, create a motion around the sun gear by setting the on line / axis of the sun gear

But the motions of planetary gear are broken

I can not simulate it.

I need a solution

Please help me.

Thank you!