These days at my job there are talks about more efficiency induction electrical motor. Some people say that induction electrical motor can be different rewinding and then become a more efficiency. A little about induction motor:
Lots of people have made mistakes when talking about efficiency because they mention just power factor. Power factor isn’t always connects with efficiency. Nice text about it:
A little more about power factor: https://en.wikipedia.org/wiki/Power_factor
One of new more efficiency winding is YY/D which explained in these two texts:
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