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Old 8th Feb 2015, 7:55 pm   #1
Aaamusements
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Default Servis Type 789043 electric motor from - ?

Not sure what this is from - whether it's twin-tub era or more modern washing machine?

Can't find any reference to it on tinternet.

Any ideas?
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Last edited by Aaamusements; 8th Feb 2015 at 8:02 pm.
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Old 8th Feb 2015, 8:21 pm   #2
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Post Re: Servis Type 789043 electric motor from - ?

Hi,
It looks like a high speed spin dryer motor so, probably, a twin tub or, maybe, a stand alone spinner. One pulley drives the drum and t'other drives the pump.
Cheers, Pete.
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Old 8th Feb 2015, 8:29 pm   #3
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Default Re: Servis Type 789043 electric motor from - ?

That makes sense, thanks.

I will test it when I find some odd bits of suitable wire and the quick test connector.
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Old 8th Feb 2015, 8:38 pm   #4
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Smile Re: Servis Type 789043 electric motor from - ?

Hi,
Be very careful powering it up off load. It's liable to achieve a speed of over 20,000 rpm almost instantly! It could cause serious injury if it rips itself out of the vice, or takes off from the bench. If you have a means of applying power slowly with a variac, that will be a bit safer. You may find that it will start to turn with as little as 30 volts on it.
Cheers, Pete.
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Old 8th Feb 2015, 11:25 pm   #5
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Default Re: Servis Type 789043 electric motor from - ?

Thank you for the warning. It's a fairly compact thing so I probably wouldn't have anticipated that!

I can probably find an AC transformer with a 50 volt output to try it with?

Other than powering a spin dryer, are there any useful applications for such a thing if it works?
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Old 9th Feb 2015, 1:34 pm   #6
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Default Re: Servis Type 789043 electric motor from - ?

It might be more use driven backwards as a dc generator. It does have a convenient pulley attached.........
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Old 9th Feb 2015, 3:13 pm   #7
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Default Re: Servis Type 789043 electric motor from - ?

Quote:
Originally Posted by Herald1360 View Post
It might be more use driven backwards as a dc generator. It does have a convenient pulley attached.........
If it runs from AC, then it won't have a permanent magnet, but an energised stator -- most probably in series with the armature windings. That kind of precludes using it as a generator
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Old 9th Feb 2015, 11:01 pm   #8
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Default Re: Servis Type 789043 electric motor from - ?

It's probably just a series wound dc motor with laminated iron to make it usable on ac. With a bit of luck it should self excite. Making a suitable control box could be interesting....
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Old 9th Feb 2015, 11:02 pm   #9
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Default Re: Servis Type 789043 electric motor from - ?

As stated above, be very careful when applying full voltage to a series wound motor without any sort of load.

Many years ago now, my Dad had one of these from a Servis spin dryer put it in a vise and attached a grinding wheel to it. When he applied full mains the motor took off like a rocket, screamed like a banshee, and the wheel shattered, badly cutting his cheek. He was lucky that it was not his eye.

I only found out a few weeks later when I was over on a visit, and I really gave his a telling off, so much so he binned the motor straight away.
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Old 10th Feb 2015, 10:53 am   #10
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Smile Re: Servis Type 789043 electric motor from - ?

Hi,
My late brother did exactly the same thing with the drum motor from an automatic washing machine. It scared the out of him!
Cheers, Pete.
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Old 10th Feb 2015, 8:45 pm   #11
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Default Re: Servis Type 789043 electric motor from - ?

Unloaded, these kind of motors will instinctively wind-up to infinite RPM in search of the stable point where the back-EMF matches the forward excitation-voltage.

They can produce a fearsome jumps-out-of-teh-vice-and-thrashes-around-on-the-workshop-floor torque at zero-RPM, too.

Beware!
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