I made a mini wind turbine using a stepper motor as a generator, and I would like to use it to charge my cell phone when I am camping or out in the wilderness. The stepper motor has the following specs:
-From the diagram, It has two separate / independent coils inside, and one permanent magnet core.
-Size NEMA 17
-Phase voltage: 6.0 VDC
-Phase current: 0.8 AMP
In winds of approximately 15 to 18 MPH, I have measured an open voltage of up to 70+ (seventy) volts.
Using only one of the coils (two of the four wires), I put it through a step-down transformer, which gives me a voltage of 10 to 12 volts - then, through a full wave bridge rectifier (RS203L), then through a voltage stabilizer (M2940ct) - then two capacitors to smooth out the ripples. At this point I get a steady 5 V output. The amps stay around 250mA / 330mA (depending on the wind speed). But never more than that. An Iphone does not charge if you don't have at least 0.5 Amps.
Question: ...and here is the thing I am trying to understand...even if I connect the other two wires from the second coil to the transformer, I don't get more than the 330mA final output. I thought the potential for this motor/generator would be 0.8 Amps * 2 = 1.6 Amps...minus all the losses, of course. So, is there a way to obtain more than 0.5Amps with this? What am I missing or doing wrong? Your comments will be greatly appreciated.
-From the diagram, It has two separate / independent coils inside, and one permanent magnet core.
-Size NEMA 17
-Phase voltage: 6.0 VDC
-Phase current: 0.8 AMP
In winds of approximately 15 to 18 MPH, I have measured an open voltage of up to 70+ (seventy) volts.
Using only one of the coils (two of the four wires), I put it through a step-down transformer, which gives me a voltage of 10 to 12 volts - then, through a full wave bridge rectifier (RS203L), then through a voltage stabilizer (M2940ct) - then two capacitors to smooth out the ripples. At this point I get a steady 5 V output. The amps stay around 250mA / 330mA (depending on the wind speed). But never more than that. An Iphone does not charge if you don't have at least 0.5 Amps.
Question: ...and here is the thing I am trying to understand...even if I connect the other two wires from the second coil to the transformer, I don't get more than the 330mA final output. I thought the potential for this motor/generator would be 0.8 Amps * 2 = 1.6 Amps...minus all the losses, of course. So, is there a way to obtain more than 0.5Amps with this? What am I missing or doing wrong? Your comments will be greatly appreciated.