You may need a transformer rated for at least 5A at about 5V or much less. It may be possible to simply add a number of turns to an present transformer, Considering that the voltage wanted is less than 1V.
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Because the line socket is not obtainable if lacking, there is actually no Secure way to attach mains into the clock. Even though the connector is current, it is simply too unsafe to employ with mains voltages.
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On the whole, it's best to presume that the supply voltage will probably be somewhat reduced compared to calculated worth. In case you look at the figures for the assorted clocks described, you see that the new minimal-voltage winding resistance is among 11 and 21 ohms.
If you are confident that you know the way to consider mains AC voltage and recent readings with out blowing up your meter or killing on your own, and you have examine the warning over and acknowledge entire responsibility for everything that takes place (fantastic or lousy), you could continue on.
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If whatsoever feasible, the very first thing to try and do is to check When the motor is effective. There is certainly not Substantially level rewinding a motor which has a sealed motor device with seized bearings, a motion that has stripped fibre gears or other challenges which make it a publish-off. The prevailing wiring need to be checked very first - never just plug the clock into the mains devoid of checking there are no short circuits amongst the mains terminals or from mains to chassis.
The a few clock motors that were rewound and measured exhibit that present is about 300mA on normal.
It's now Prepared for reassembly and further more assessments. The magnetic circuit is quite crude, and when compared to a A lot previously Warren Telechron motor that I have, this just one was built at any given website time when Price tag was vital.
The motor will get much of its ability from the much better than regular magnets inside the rotor. Down below, you may see the terminal housing about the back again from the motor Bakelite moulding.
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Once more, presented the age of your clock and its insulation, it can not be regarded as reliable. The outer insulation around the coil was so brittle that it just fell to pieces once the coil was removed from the housing and magnetic pole-pieces.
Along with the clock motor working, evaluate the voltage throughout the one ohm resistor. You'll want to get a reading through somewhere between 15-25mV for 220-240V 50Hz motors. I am unable to give an exact determine for a hundred and ten-120V 60Hz motors mainly because I don't have access to 60Hz electric power, but I might guess that The present ought to be approximately double that of the nominal 230V motor (i.