I have a Sharp MW. The turntable sometimes rotates
clockwise,othertimes it rotates counter-clockwise.If someone knows the
reason why,I would appreciate an answer.No one so far has been able to
explain this.Just some FOOD for thought! Thanx
Well, if it always turns in one
direction the food will tangle, so you must
untangle ..... just kidding. Many
gear-head motors that run on 110 AC,
have "shading rings" to set up the
magnetic field so they always rotate in the
same direction. These are 1 turn chunks
of copper that will go through and/or
around the steel laminations. I have
noticed in the last few years, many small
motors like that, don't have shading
rings and will start in a random direction.
I guess if it doesn't make any
difference, like in a microwave
turntable, it makes
the motor $0.00001 cheaper. BTW, my
microwave does the same thing.
Lee burch wrote:
What kind of motors do you think those are?
AFAIK, without shading rings a simple induction motor will not self
start. But, there are all sorts of small motor designs around now I
never encountered when I was a kid, just think about what's in a modern
Perhaps they're using DC motors, two phase AC motors, or some kind of
stepper motor for those microwave turntables now, driven by a few
components on the appliance's circuit board.
Based on what Edwin said, I doubt that the starting direction is really
I know my 4 year old GE microwave's turntable always rotates in the same
direction as my grandma's Victrola's, but it might be interesting for
the OP to run some tests or even, G-d forbid, RTFM and let us know if
it's really random.
You're right. I even saw a motor with a
mechanical direction unit. If it went the
"wrong" way, it bounced off a ratchet
device and went the other way. But I
thought a small motor with a rotor would
self start. It's just the synchronous
wouldn't start by themselves unless
something it added. I know old (very
had to be "spun" to get them going.
They too, would go either way. But,
as you stated, it's probablythe way the
whole thing was designed.
That's the nature of the type of syncronous motor installed in most
turntables. It depends on where in the AC cycle the motor is started as to
what direction it will go. If the motor is turned on at the rise of the
cycle, the motor will go one way; if on the downturn of the cycle, it will
go the opposite. It doesn't really matter, as long as the turntable turns.
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