The power measurements I describe are DC side after rectifiers. On the AC output of gen.1 I measure 88 vac @ 2.2 amps when I do not have gen. 2 connected. In this configuration the total amp draw at motor is 4 amps @ 90vdc.
I then connect gen. 2 and gen.1 to the input terminals of bridge rectifier together. When I do this the motor accelerates and its amp draw drops to 2 amps @ 90 vdc. The AC output of gen. 1 now shows 86 vac @ 1.75 amps. Current through gen. 2 is 1 amp @ 86 vac.
Keep in mind that gen. 2 has no prime mover and doesn't provide any power. When I connected gen. 2 I expected it to increase the load on generator 1 but instead it decreased.
Motor turning gen.1 no load- .81amps 90 vdc @ motor. 2060 Rpm. Only variac supply power.
Motor turning gen. 1 with output looped back to motor plus variac - 4 amps 90 vdc @ motor. 1750 rpm.
Motor turning gen. 1 with gen.2 connected plus variac - 2 amps @ 90 vdc. 1935 rpm
Note that the power alternates equally between positive and negative.this means that power is being alternately absorbed from and returned to the source. If the source were a mechanical generator, it would take ( practically ) no net mechanical energy to turn the shaft, because no power would be used by the load. The generator shaft would be easy to spin, and the inductor would not become warm as a resistor would.
In the general case, you can't derive AC power from separate voltage and current measurements. A dedicated power meter is needed.Does it effect the outcome of power measurements.
Apart from possible accuracy problems, the method is only accessing displacement power factor and doesn't work for non sinusoidal waveforms.three voltmeter method for measuring power factor
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?