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The synchronous motor 'enamel' are Obviously noticeable over. Note the motor stator only covers a one hundred eighty° arc, and is basically a really crude arrangement. Having said that, it works just great despite the alternatively crude implementation.
There are plenty of ways to ascertain the number of turns required to run a clock motor at a special voltage from the original design price. The method explained beneath is sweet, but may be a tad complicated if taken to extremes (as I did in The outline).
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Generally, it's best to think that the availability voltage will likely be somewhat lessen in comparison to the measured benefit. For those who consider the figures for the different clocks described, you see which the new lower-voltage winding resistance is among eleven and 21 ohms.
In case you are assured that you know how to choose mains AC voltage and latest readings with out blowing up your meter or killing oneself, and you've got examine the warning earlier mentioned and take entire responsibility for anything at all that happens (very good or terrible), it is possible to proceed.
It's not hard in any respect, nonetheless it does require that you've got entry to a variable AC voltage of concerning three and 20V. A multi-tapped reduced electrical power transformer may be used, or use any transformer that you have handy as well as a Variac™ (variable voltage transformer).
If in any way achievable, the very first thing to do is to check When the motor is effective. You will find not Significantly stage 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 a compose-off. The existing wiring really should be checked very first - hardly ever just plug the clock to the mains without having examining there are no short circuits among the mains terminals or from mains to chassis.
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I remarkably endorse forever labelling the top of your result in establish the correct energy resource. You may not want to stick a label around the clock alone, as a lot of label adhesives can mar the end.
The technique explained underneath involves connections to mains electrical power, and ought to in no way be attempted Until you are 100% specific within your ability to consider measurements of mains electrical power. An easy blunder may be lethal.
I can't anxiety ample that if you are even the tiniest little bit Uncertain with the course of action - Do not get it done. It is really much better to easily experiment with very low voltage windings right until you obtain it to the point in which it really works adequately than to possibility electrocution!
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Together with the clock motor working, evaluate the voltage through the one ohm resistor. You ought to get a examining somewhere between 15-25mV for 220-240V 50Hz motors. I can not give an accurate figure for one hundred ten-120V 60Hz motors mainly because I don't have entry to 60Hz ability, click here but I'd personally guess that the current really should be around double that of a nominal 230V motor (i.