Small Synchronous motor wiring

[skon1212]

Not sure if this is the right place to post this but I need some help.
My GF and I bought some animatronic stuff for Halloween at a sale and when we got it home one of the props did not work. We pulled the motor out and figured that it was possibly burned out. We ordered a new motor, wired it like it was before and it still does not rotate like it should. Just curious if I am missing something. I know it is getting power as the light behind the motor lights up and the motor gets warm, but the shaft coming out of the motor does not rotate. I did take a pair of pliers to try and rotate the shaft but it just clicks so I left it alone. Any ideas what I may need to do different? I included some pics of what I am dealing with. If you notice in the second pic where the wires attach to the power source there is an unused prong. Not sure if that may have something to do with it. Thanks in advance for any help.

 

[Norcal]

What voltage are you operating it on? If 120 volts it's toast, as the motor tag says AC 12V 50/60 HZ.

 

[skon1212]

Running it off a 12v plug. Its a plug that has various volts you can choose from.

 

[klassenl]

Is your power supply AC or DC. You will notice it says AC12V on the motor. If you supply it with DC12V it won't work.

 

[Norcal]

Running it off a 12v plug. Its a plug that has various volts you can choose from.

Wall wart? Most are DC, a simple transformer w/ 12V output will work.

 

[skon1212]

The power supply is AC. Like I said I am using a transformer that plug into the wall and has selectable volts from 1.5 to 12. It was definitely on 12 when I plugged it in.

 

[Alchymist]

Did you actually check the voltage from the power supply with a meter? If it is at 12VAC, it's the motor - either bad or connected wrong.

 

[nehog]

Did you actually check the voltage from the power supply with a meter? If it is at 12VAC, it's the motor - either bad or connected wrong.

This... Check to make sure the voltage is AC and not DC. It is odd that the original motor was bad, and the new motor was bad as well.

 

[skon1212]

What would be the best way to check the voltage? I have a multimeter but the end of the transformer has a pin plug. Do I put one lead of the multimeter to the inside and one to the outside? There is a light that runs off the same switch and that lights up just fine.

 

[skon1212]

Ok, I feel like an idiot. I hooked up my multimeter to test the adapter and sure enough it is an AC to DC adapter. Whoops!!! So I guess I need a straight 12V AC adapter correct?

 

[nehog]

Ok, I feel like an idiot. I hooked up my multimeter to test the adapter and sure enough it is an AC to DC adapter. Whoops!!! So I guess I need a straight 12V AC adapter correct?

Yes, or a simple transformer.

 

[skon1212]

Yes, or a simple transformer.

How would the transformer work? Would you direct wire into the motor? Might be a cheaper route then getting another adapter.

 

[nehog]

How would the transformer work? Would you direct wire into the motor? Might be a cheaper route then getting another adapter.

Cut the wire off your existing adapter, and connect to the output of a 12V transformer. Since it is AC no polarity issues.