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Need help with AC motor Answered

What is a low cost way of vary a 2 pole ac motor? I know a vfd can handle the job, but I am looking for a way under $100. Also can someone help me out with some wiring. If I have a 120 VAC motor plugged into the wall, how would I reduce the voltage enough to run LEDs off the same supply wire? In other words, I only want to have 1 plug and run a motor and LEDs at the same time. Any help would be greatly appreciated.

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cory_tripp

7 years ago

I need to have 12V DC for 4 different LED arrays.

AC motors do not have motor controllers do they?

Again thanks for all of the help.

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mpilchfamily

7 years ago

You will need an AC to DC converter. Cheap ones use a transformer to take the 120/240 VAC from the wall and drop it to 12/24 VDC. Then using a bridge rectifier to convert the AC voltage to DC voltage. Then run that through a voltage regulator to drop it down to the voltage you need. If you are going to use a string of LEDs then keeping it at 12V would be good. It would probably be better to buy an switching power adapter since it is more efficient. But you can use pretty much any wal wart you happen to have lying around the house.

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mpilchfamilycory_tripp

Reply 7 years ago

Why do you have 4 rectifiers? Do you need 120VDC for 4 different devices?

If you want to control the speed of the motor you'll need a motor controller.

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cory_trippmpilchfamily

Reply 7 years ago

So do you think the circuit diagram attached would work? Any advice on varying the speed of the ac motor specified? Thanks for the quick reply by the way.