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This seems like kind of a dumb question but...I've noticed that lots of microwave ovens change their direction of rotation if you open and close the door. I can't think if any reason for this. I know that the microwave field in the oven can have standing waves in it, meaning that there are "hot spots". The food rotates to try and stop these more intense patches heating one bit of the food faster that another bit. But why change the direction of rotation (clockwise vs anticlockwise) after the door is opened. The best I can think of is that it may stop some part wearing out from always rotating the in same direction...but this doesn't seem massively plausible.ThanksNiall
Interesting question. Let's begin with the more simple (silly?) answer: maybe not to make the oven rotate on the table, after some time!? 
I tried ours and it spins one way or the other when opening and closing the door in a random manner...not alternate. I think it is just a function of the type of the simple single phase induction motor which can spin in either direction when it is first powered.
I think it is just a function of the type of the simple single phase induction motor which can spin in either direction when it is first powered.