Lestraveled
- Joined May 19, 2014
- 1,946
Why do you need any 21 volt turntable motors when you can get 120 volt and 240 volt turntable motors without making a special fan motor (with a 21 volt winding tap)? The fan motor and the big power transformer have to match the local power voltage. What's so hard about installing a turntable motor that uses the same voltage as everything else?
What? They only have to carry the 21 volt motors if they custom wind every fan motor for 120 volts and 240 volts?
I would think custom winding a fan motor costs more than stocking 2 voltages of turntable motor...or...they could use 240 volt fan motors with a center tap and only stock one fan motor and one turntable motor.
Here is a schematic for a Millermatic 150 Mig welder. Notice a part on the left labeled "FM". It stands for "Fan Motor". Also notice that it has a separate winding, it provides power to the wire speed control board. You don't have the expense of a transformer.
I think the 21 volt tap on the microwave oven fan fed more than the turntable motor. I bet it was rectified and powered the control board also.
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