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A transformer couples two or more AC signals through a magnetic field. Often used as galvanic isolation and to transform one AC voltage to another.
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Measuring the L/R ratio of an LR circuit
I measured the waveform on the primary side of the transformer with an oscilloscope (fig.2) and found that the time 5*L/R is equal to 7.8 ms. … Then I thought: can we consider the transformer and coil with the same logic or should we consider the transformer differently? …
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Does the increasing of supply voltage, for a asynchronous motor, increases its speed?
Second step, I decided to step up the voltage to 470V -with a 3 phase transformer- to have more speed as the torque is fixed, but the suprise was no more speed with the increasing of voltage. …