8V is lost over the wire resistance ( V = I × R ) having a latest of 311mA. The motor would not treatment with regard to the voltage, only The existing. which is the first parameter in all calculations. Even though we are constrained by transformers which might be created to offer a specified voltage, Fortuitously it's easy to work this as soon as we understand how.
Even though purists may possibly object to replacing the coil, if carried out cautiously It's going to be a) completely invisible, b) conveniently reversible or c) both equally! There is no comparison amongst an aged electrical clock with its original movement, but modified for lower voltage Procedure, vs. a case that's been gutted and fitted using a quartz movement.
There are plenty of means to find out the amount of turns needed to run a clock motor at a special voltage from the original design worth. The strategy explained under is sweet, but could be a tad advanced if taken to extremes (as I did in The outline).
This mix of aged and deteriorating insulation, deficiency of a safety earth, along with the Pretty much entire insufficient any kind of electrical safety specifications ensures that lots of the remaining synchronous motor driven clocks are extremely perilous.
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Earlier mentioned you are able to see the different bits on the dismantled motor. Preliminary assessments are actually done (as explained beneath) along with the examination winding is done.
Alternately, simply just wind as lots of turns as will in good shape on to the previous. Since the voltage is lower, difficulties are unlikely even though you don't have very as quite a few turns as you'll want to. You need to do need to validate the end result operates neat more than enough so as never to risk insulation damage - If you cannot hold the winding as part of your hand following 2-three hrs of operation from the clock case, It is as well hot.
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The main clock to generally be converted belongs into a fellow member of your clock club. I only had the motor (pictured below) - the movement and case pix have been following the conversion by the clock's proprietor. The power direct was in exceptionally poor affliction, with insulation crumbling and slipping from the wires near to the coil. There was no insulation about the bare connections for the coil, as well as mains guide was 'secured' in the situation which has a knot.
Now, measure the exact voltage and recent drawn. Use the one Ohm resistor once again, because it's Considerably safer in your meter to get it done this way. Measure the voltage through the resistor to find out existing, and evaluate the voltage right throughout the motor - not the supply voltage!
At minimal voltages, the prospect of the internal small circuit creating overheating or hearth hazard is almost zero. The maximum doable voltage through the windings is 16V - enamelled wire will stand up to this for good. Precisely the same can't be reported for extremely slender wire, with really previous enamel, subjected to the total mains voltage.
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one.56W This seems like it ought to be wonderful with all around 800 turns, and Though a proper examination ought to have been run working with the method described for the Telechron motor, I did not. This motor is adequately different through the previous two that assumptions must be prevented, but I've been accomplishing such things as this for many years, so elected to just rewind the coil utilizing the 'educated guess' technique.
The instantaneous spike (or surge if you favor) can reach A huge number of volts, and spikes eliminate computers, TVs, DVD gamers and also other mains run equipment routinely. To assume that antique insulation can stand up to these abuse forever is wishful contemplating. Most motors were not impregnated, and the two Smiths in particular experienced very tiny clearances among Dwell conductors and the clock motion. I wouldn't have faith in either of these so far as I can kick a piano.