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In general, it is best to suppose that the supply voltage will be somewhat lower compared to the calculated worth. Should you consider the figures for the assorted clocks explained, the thing is that the new small-voltage winding resistance is involving 11 and 21 ohms.
Even though fairly in need of the figure calculated in advance of, it isn't really unreasonable. No less than we know that we've been in the best region. Experienced the next calculation shown (such as) one,five hundred turns were essential, then it is apparent that a blunder should have been designed somewhere. At this point, you would likely have to go back to the beginning and re-do the measurements.
Most of all, we have some information regarding the conventional functioning situations in the motor. A lot of the used recent is usually turned into operate (turning the motor), And so the nameplate rating of 2W might be quite exact. Not all will likely be, instead of all synchronous clocks also have a nameplate.
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As you could see in the photo underneath, the insulation is virtually slipping off the coil, you will find weakened windings wherever something has poked into the opening, and There is certainly also a duration of uninsulated wire in significant danger of creating a shorted turn (the wire is visible, even so the prospective shorted turn is within the again).
Introducing a fuse in to the minimal voltage circuit makes sure that excessive latest will blow the fuse, and presents protection from an above-existing problem. Low cost 'Poly Switch' thermal fuses can be used at small voltages, and will simply be integrated in the new winding if sought after. Precisely the same cannot be mentioned for just a clock working at mains voltage. The standard current draw could only be 10-20mA, and in some cases below fault conditions this might only rise to Most likely double that figure.
This is well verified by measurement. Any mains synchronous motor clock could be set using the most accurate time conventional obtainable, and can be verified against exactly the same typical 7 days right check here after week.
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In general, the procedure explained is a simple and Protected way to operate an old synchronous clock. Though you can find other alternate options to the tactic explained, they involve the acquisition of elements which might be considerably dearer compared to the double insulated 16V plug-pack, and don't provide a similar In general safety level.