On 1/27/2014 1:22 AM, Joerg Arndt wrote:
Most certainly a kind of motor is used where the initial internal position (and possibly the initial current) determines the direction.
But I've noticed that mine seems to be completely consistent. It reverses every time.
A similar thing used to be (long ago) a problem with tractors when the motor was idling: it could start moving backward when put into move, potentially injuring/killing the people accompanying it (usually walking behind).
A two-stroke engine will also run backwards. Even though the ignition timing is poor for running backward it can get started that way by kicking back when starting. Once at the start of a motorcycle race I saw kid have his bike lurch backwards as everyone else leaped forward. A look of puzzlement came over his face as he tried easing out the clutch again and the bike started to back up. Then he threw down the bike as if it had betrayed him. Brent Meeker
Best, jj
* James Propp <jamespropp@gmail.com> [Jan 27. 2014 10:12]:
Why do microwave ovens alternate between rotating the food-carousel clockwise and rotating it counterclockwise (or, as the Brits would say, anticlockwise)?
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