8V is shed throughout the wire resistance ( V = I × R ) that has a present-day of 311mA. The motor would not care concerning the voltage, only the current. and this is the first parameter in all calculations. Whilst we're constrained by transformers that happen to be meant to supply a specified voltage, Thankfully It is easy to operate this after we understand how.
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There are various ways to ascertain the volume of turns necessary to operate a clock motor at a unique voltage from the initial style and design value. The method described below is nice, but could be a tad sophisticated if taken to extremes (as I did in the description).
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For clock motors that characterize a genuine fireplace or electric powered shock hazard, corrective action is essential. No, the clock will no longer be authentic, but what's the distinction between cutting a new wheel for an eighteenth century clock and rewinding the motor coil of a synchronous electrical design? There's no authentic difference - In case the clock is to function, then the mend needs to be produced.
Using your variable AC electricity source (possibly the Variac + transformer or multi-tapped transformer), use enough voltage to have the motor turning. You'll probably discover it will require someplace amongst 3 and 6 volts.
You must add a little degree of more to make sure the motor will operate even when the mains voltage is lessen then standard, so If your motor starts to run reliably at 3V AC, the the best possible voltage is a little bit over 4V (add close to 40% safety margin).
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It's actually not incredibly loud, but Because the clock dates again to the Significantly quieter time I suspect it would have been rather adequate.
7 Electrical power Dissipation True electrical power dissipation can only be established following the coil is wound. An extremely tough approximation can be done now nevertheless - this may show if the wire dimensions is simply too little, which is able to induce extreme dissipation. The examination coil experienced a measured resistance of 1.
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With all the clock motor operating, evaluate the voltage throughout the one ohm resistor. You'll want to have a looking through somewhere concerning 15-25mV for 220-240V 50Hz motors. I can't give an accurate determine for a hundred and ten-120V 60Hz motors mainly because I don't here have entry to 60Hz power, but I'd guess that The existing really should be around double that of a nominal 230V motor (i.