Use a multimeter to examine the resistance in between mains pins to the plug - for nearly any clock motor, assume a little something in excessive of 2k ohms for 230V and 1k for 120V motors. Take a Take note on the resistance looking at, simply because you'll need it later.
While purists may possibly object to changing the coil, if performed thoroughly It will likely be a) completely invisible, b) quickly reversible or c) the two! There is not any comparison among an old electric powered clock with its original movement, but modified for minimal voltage Procedure, vs. a circumstance that is been gutted and fitted which has a quartz movement.
Because the line socket is now not obtainable if lacking, there is simply no Risk-free way to connect mains to your clock. Although the connector is current, it is simply too unsafe to implement with mains voltages.
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For sure, the Screen might have been impressive, however the Hazard of lethal electrical shock is obviously pretty actual without a doubt. The outer wrapping to the coil was also ruined with the arc, and the initial (decaying) cable was wired directly in to the coil without having terminals (once again, a result of the insufficient Place).
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If whatsoever feasible, the very first thing to carry out is to examine If your motor functions. You can find not much point rewinding a motor that includes a sealed motor unit with seized bearings, a movement which includes stripped fibre gears or other troubles which make it PROENC a generate-off. The prevailing wiring should be checked initial - by no means just plug the clock in to the mains with out examining that there are no small circuits concerning the mains terminals or from mains to chassis.
To double Verify, we can undertake another process. We realize that 150 turns were useful for the take a look at winding, and which the used voltage was three.72V AC. This is shut more than enough to 40 turns for each volt. Since we wish to work the motor from 16V, we hence need to have no less than ...
Now, evaluate the precise voltage and latest drawn. Make use of the one Ohm resistor yet again, since it's Considerably safer on your meter to do it like that. Evaluate the voltage over the resistor to find out present, and evaluate the voltage straight over the motor - not the supply voltage!
That has a lower voltage circuit, any readily available very low voltage connector can be employed, it does not want heavy duty insulation, and needs only to become sufficiently various with the connectors made use of on other small voltage appliances to be certain they can't be inadvertently interchanged.
There remains an actual danger of electrical shock, since the output is at typical mains potential, so when you Get in touch with the two potential customers simultaneously you can nevertheless receive a (potentially fatal) shock. There's no difference between the full output of the isolation transformer and regular mains, besides that there is now not a specific Energetic (Stay) and neutral conductor.
All over again, offered the age in the clock and its insulation, it can't be regarded honest. The outer insulation within the coil was so brittle that it just fell to parts if the coil was faraway from the housing and magnetic pole-parts.
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