Microwave rotating plate

I noticed that the rotating plate of many microwave ovens usually rotates with a specific direction, even if sometimes this changes. What makes the plate rotating clockwise/counterclockwise?

I know that in many two-phase AC synchronous motors a capacitor is added to create an initial phase shift which (I imagine) determines the rotating direction. However, can it be that this direction reverses e.g. depending on the initial position of the rotor? Or is it that in some case this capacitor is not added?

• – Andy aka Dec 6 '19 at 12:15