220-V 50-Cycle Synchronus Motors Running on 110-V 60-Cycle

Have you considered putting a switching transformer(110/220)in line?

Then you can make them all the same.

You could switch the input voltage and the output could remain the same.

Just a thought.

That is a possibility,

But what do they cost? The shipping already is taking a large chunk of added costs. any thoughts of where to find such a beast, and average cost?

In addition a quick look, there are many that switch voltages, but that's not enough, it must also change the frequency also. Taking a 60 cy motor and running it on 50 cy power it's not going to give correct time. running that slow, it won't even have the accuracy of a broken clock joke of it's correct twice a day, this would be only once a day.

hi hi.

I would try to find a European supplier of electric alarm clock motors. In the US an example would be Eagle Signal, and maybe they could give some advice.

Did you consider going frequency-free (through DC Motor or may be your synchronous motor with just a rectifier and 60Hz inverter) ?

If you want then you can just have a secondary socket for 220V input with a step down transfrormer just across it.

Just a technical thought - no economics involved.

Your best bet will be to just replace the motor unit with a 120 volt 60 Hz 1 RPM unit. those tiny synchronous gearmotors are common and fairly cheap and come in standardized sizes so replacing one with another is easy.

No, See

the 110V 60 cy is what IS in the clock here where I sell the most of them and of course build and test them. But I have been getting a lot of interest of overseas sales. but of course a 110 volt 60 cycle syncronous motor wont work in those places.

so I'll have to install a motor that will, and i was just wondering if a 220vac 50 cy motro will even run on 110 vac 60 cy power.

Joe

Your clock is very cute. I would not stress a 220 volt motor by putting 110 on it. The wires in those things are microscopic. Just get a power supply to provide 220 volts for the test. The speed won't be right, but you will know it spins.

Check Radio Shack for the power supply, you may even find one with European receptacles. They sell such as this so folks can use foreign purchased gizmos here, and vice versa. Do you have to change the plug for export use? They use different plugs over there.

Good point on the voltage.

I was more thinking of the frequency that the voltage. yes dropping the voltage is gonna double the current, and it might end up being just a big fuse.

But the idea of the radio shack voltage converter or equivalent is good. it will be 220 v but 60 cycle.

or for that matter, why bother with that converter at all, just bring over to the "European" test area the 220 volt and correct receptacles also.

I will just need a European synchronous clock to be the master to compare the built one to for the correct time.

Actually those little motors don't have a problem with being connected to 120v. They are very inefficient and are more of a inductor than a motor if that make any sense.

Their design is just a single coil with a set of steel plates on each end that make up the stator poles for the motor. Being so inefficient by design is why the can stay stalled without burning them out.

Also just using a 120:240 step up transformer to give them 240 volts at 60 Hz wont do any damage as well but it will make them run faster as had been mentioned earlier.

Thanks,

What you need--a 220 volt 50 Hz 1 rpm synchronous clock motor--ought to be real easy to find. That's what would typically be in a European electric alarm clock. However, I'm getting lots of irrelevant stuff from Web searches.

Battery powered quartz clock movements are inexpensive, but most of them will lack the torque to lift the steel marble each minute. Also, they tend to move in start-stop 6° steps, whereas smooth motion is better in your case.

The difference between 50 and 60 Hz is just a matter of a 5- or 10-tooth gear versus a 6- or 12-tooth gear somewhere in the train.

Just some ideas. I'm surprised at the number of posts that overlook the Hz question.

If you can find a European clock shop....

Exactly,

even over here a standard 1 rpm motor are getting harder and harder to find, and many are getting quite expensive also.

I know it seems simple, but i have learned the hard way that it is not ya know?

Joe

First search I did. http://www.newark.com/crouzet/82344771/motor-geared-230vac-1rpm/dp/19J6559?in_merch=Popular This should help narrow down your search parameters.

But it doesn't say if it's 60 or 50 cy ya know?

Plus it's getting right up there price wise to start making the clock even less affordable than it already is.

Joe

Open the link and click on the data sheet it has more information.