Post History
The turntable is apparently run by a cheap synchronous motor. There is a type of motor that's easy to manufacture, that turns synchronously with the line frequency. You say the table used to rota...
Answer
#1: Initial revision
by
Olin Lathrop
·
2021-01-27T14:50:27Z (almost 4 years ago)
The turntable is apparently run by a cheap synchronous motor. There is a type of motor that's easy to manufacture, that turns synchronously with the line frequency. You say the table used to rotate at 6 RPM with 60 Hz power, and now rotates at 5 RPM with 50 Hz power. That is exactly what you'd expect from a synchronous motor. The turning of the food in a microwave oven is only to even out the effect of hot and cold spots. It's not very critical, and whether one turn takes 10 seconds (6 RPM) or 12 seconds (5 RPM) doesn't matter.