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The synchronous motor 'enamel' are Plainly visible earlier mentioned.  Observe which the motor stator only addresses a 180° arc, and is largely a very crude arrangement.  Nevertheless, it really works just high-quality despite the relatively crude implementation.

7V to 12.7V.  None of the matters a person iota if the motor runs fantastic and remains not more than lukewarm.

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Higher than it is possible to see the assorted bits of the dismantled motor.  First tests are already performed (as described down below) and the exam winding is concluded.

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315mm wire I used for the exam.  The coil is well checked in advance of closing finishing, and since the voltages applied are Safe and sound, you don't require to bother with suitable insulation - masking tape is properly alright.

  At lower voltages, the chance of the internal limited circuit causing overheating or hearth risk is sort of zero.  The most feasible voltage throughout the windings is 16V - enamelled wire will face up to this for good.  The identical can't be claimed for quite thin wire, with incredibly old enamel, subjected to the full mains voltage.

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six   Alternate Strategy An alternative method can be utilized that doesn't need any link to your mains.  You will have to use ten turns of reasonably heavy gauge wire (at the very least 1mm diameter, and if possible bigger).  Your multimeter have to also be able to reading through pretty minimal AC voltages properly, normally all around 50-200mV AC.

Together with the clock motor functioning, measure the voltage across the 1 ohm resistor.  You'll want to receive a reading somewhere concerning 15-25mV for 220-240V 50Hz motors.  I can't give an exact determine for one hundred ten-120V 60Hz motors mainly because I haven't got access to 60Hz electricity, but I might guess that The existing should be about double that of a nominal 230V motor (i.