Use a multimeter to check the resistance between mains pins within the plug - for almost any clock motor, assume a little something in excess of 2k ohms for 230V and 1k for 120V motors.  Take a Be aware of the resistance studying, because you'll need it later on.

There isn't any very good rationale in any way to test to retain initial electrical pieces which can be probably hazardous.  Any elements eradicated can naturally be stored With all the clock, so when it might be functioning with Secure electrics, at the least the initial do the job is kept for posterity.

There are various strategies to find out the amount of turns required to operate a clock motor at a distinct voltage from the initial style and design worth.  The method explained beneath is good, but could be a tad sophisticated if taken to extremes (as I did in The outline).

Existing is measured indirectly, utilizing a one Ohm 5W resistor in collection With all the neutral lead.  Working with key electrical power is never Risk-free, but this cuts down the chance rather.  If you don't know how to find out the neutral direct, you shouldn't attempt this technique.

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18W.  Heat here dissipation continues to be under the first coil, so all specifications have already been content.  Prolonged-expression electric power dissipation of the new coil was also tested, utilizing the 16V AC plug-pack offer revealed over.  Following quite a few times ongoing functioning the motor assembly remained barely heat, although the calculated voltage was 18V AC - This is often beautifully usual.

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The main is to rewire the clock employing a 3-Main earthed lead as explained.  This can make the clock electrically Secure, but does nothing at all to address the opportunity of fire due to the motor coil overheating.  While this is probably unlikely, I'm unwilling to belief insulation that is involving 50 and 70 years outdated.

By natural means, If you're sure within your talents and also have a set of mains electrical clocks, it might be really worth your while.

The 'motor' itself is just the coil, magnetic pole-parts and terminals, and it absolutely was very obvious when taking it aside that doing so was by no means envisioned.  Need to the coil fall short, all the Bakelite coil housing might have been replaced.  The mains cable is terminated through the screw terminals, and no kind of cable pressure aid exists (or at any time existed as around as I can tell) anywhere In the situation.

  I had even changed the harmed outer wrapping on the coil Along with the intention of applying it at the traditional (240V) voltage, but on even more evaluation from the winding I place the clock aside.  The inter-layer insulation is simply paper, and there's no proof that the coil was impregnated.  Continued use with 240V AC is simply too unsafe to take into consideration.