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Generators & Electric Motors General Discussion Antique Generators and Old Electric Motors: Questions and answers about restoring and showing old power generation systems.

Generators & Electric Motors General Discussion

20 vac motor


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  #1  
Old 11-09-2018, 06:47:38 PM
opus opus is offline
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Default 20 vac motor

[Might not be the right place for this so let me know]

I have a 20vac 2a motor that I want to run off of 120vac. How can I do this reasonably? Its only a test so I dont want to have to throw a chunk of money at it.
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Old 11-09-2018, 06:59:01 PM
Railroads Railroads is offline
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Default Re: 20 vac motor

You need a 120v to 20vac transformer rated at 5 amps to run a 2 amp motor.

Robert
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Old 11-09-2018, 07:00:39 PM
opus opus is offline
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Default Re: 20 vac motor

And this would work?

https://www.sustainablesupply.com/Pl...1Y714-C1159187
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Old 11-09-2018, 07:04:07 PM
Ed Radtke Ed Radtke is online now
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Default Re: 20 vac motor

you can use a variac transformer,then when your done with your experiment you will have another useful tool in the shop.
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Old 11-09-2018, 07:08:09 PM
opus opus is offline
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Default Re: 20 vac motor

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Originally Posted by Ed Radtke View Post
you can use a variac transformer,then when your done with your experiment you will have another useful tool in the shop.
Christmas is coming, need my address?

If it gets to be something i am going to continually do, then yes, I will get one of those.
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Old 11-09-2018, 07:18:42 PM
Radiomike Radiomike is offline
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Default Re: 20 vac motor

Many automotive battery chargers use two diode full wave rectification with a centre tapped transformer. This will give you around 20 volts AC RMS before the rectifier. The most basic battery charger without electronics would be best. If you modify a battery charger check the volts before you make expensive connections.

The link https://www.sustainablesupply.com/Pl...1Y714-C1159187 is only for a 16VA power supply you need 40 VA to just give you 2Amps.

What is the motor for and what type is it?

Mike
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Old 11-09-2018, 07:23:34 PM
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Default Re: 20 vac motor

It's a popcorn hot air popper fan motor. I do have a power supply that's 24 volt output with 1.875 amp. From what I have read that 20 volt motor will take 24 volts, make sense?
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Old 11-09-2018, 07:26:41 PM
Railroads Railroads is offline
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Default Re: 20 vac motor

If the motor is a brushed type it might run on DC which would open up possibilities.

Robert
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Old 11-09-2018, 07:45:51 PM
Jack Hottel Jack Hottel is offline
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Default Re: 20 vac motor

Look for a 120/24V, 40VA or larger control transformer. Used on all HVAC equipment, probably can find a used one from a junked unit.
Jack Hottel
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Old 11-09-2018, 08:14:48 PM
Power Power is online now
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Default Re: 20 vac motor

Quote:
Originally Posted by opus View Post
It's a popcorn hot air popper fan motor. I do have a power supply that's 24 volt output with 1.875 amp. From what I have read that 20 volt motor will take 24 volts, make sense?
That is 20% over rated voltage. I would not run it on that for long. Being a tinkerer, I would look over my stuff. I would probably try an auto headlamp with low & hi beam filaments wired together in series with motor.
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