I don't think you'll be able to get the current much higher than you already have from a transformer and bridge rectifier.
Take a look at the Hammond Transformers Design Guide for Rectifier Use
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Therefore your 5A RMS transformer secondaries are only good for fractionally over 3A DC, when used with a bridge rectifier and reservoir capacitor.
Therefore your 5A RMS transformer secondaries are only good for fractionally over 3A DC, when used with a bridge rectifier and reservoir capacitor.
Thats what i am worried about sir
As per your saying
I should get 3A from one transformer
But i am getting 1.3A from it
Which is the problem
I think instead we have to look to the 70 m long wire. This was said to have a resistance of 3 ohms in a previous post. Is this resistance for just one leg, or for out and back combined?
5 A through 3 ohms will drop 15 V, and 5 A through 6 ohms will drop 30 V. This will drastically limit the voltage the motor sees when you open the the throttle and put a load on it.
Get your 70 m wire, join the two conductors together at one end, then measure the resistance between the two conductors at the other end. What is the total round trip resistance of the wire, out and back?
Can you confirm the 1mm wire diameter? Also, what's its strand count and individual strand diameter?
The minimum wire diameter is determined by how much voltage drop your application can tolerate. Calculate the maximum wire resistance you can tolerate then look through a cable manufacturer's catalog for a cable with a low enough resistance per meter to be under that after multiplying by the total wire length there and back.
The minimum wire diameter is determined by how much voltage drop your application can tolerate. Calculate the maximum wire resistance you can tolerate then look through a cable manufacturer's catalog for a cable with a low enough resistance per meter to be under that after multiplying by the total wire length there and back.
How is the circuit constructed, under the cartons? Is possible to show a photo?
It is not clear where the measurements are done. Are these on the controller or at the output of the circuit?
One more test that you can do, is to try to measure the ripple voltage of the power supply. Set your meter to AC voltage, measure at the output without and with a little load, on each of the four and the entire combination of them. [with capacitors connected]
In practice it will be worse than the calculation gives because the copper wont be 100% pure and the overall diameter makes no allowance for the voids between strands.
In practice it will be worse than the calculation gives because the copper wont be 100% pure and the overall diameter makes no allowance for the voids between strands.
I beg to differ. Commercial copper wires available today have more than 100% of IACS conductivity. Also, the area mentioned on the wire (at least the ones IS 694:2010 certified) is the actual area of all the strands combined, so the "packing void factor" is ruled out. But yeah, the temperature may not be 25 deg. C at OP's location, so the resistance will be a bit higher.
1. Is all the wiring connecting all your components of this gauge or thicker?
2. What is the total length of wiring from the transformer to the load? (Just answer for a single wire - and we will double it for any maths.)
How is the circuit constructed, under the cartons? Is possible to show a photo?
3. Can you please show us a photograph of the hidden wiring?
4. Can you please provide a schematic of the entire circuit - from the supply, through the controller to the load? (Do not try to look inside the controller - just show the connections to it.)
One more test that you can do, is to try to measure the ripple voltage of the power supply. Set your meter to AC voltage, measure at the output without and with a little load, on each of the four and the entire combination of them. [with capacitors connected]
5. Can you test the supply as suggested showing:
a) DC volts, AC volts - with no load and..
b) DC volts, AC volts, DC amps - for a load current between 0.5a and, say, 3A
I have some doubts now despite of changing the wire which can handle 10amps psu is not able to supply even 7A I have strong doubt about the center tap transformer i think i have read somewhere by connecting wire 1 and 3 we get half the rated current is that true ? All the connections are rigid now so there will be no leakage current think so... TWO MORE REPLIES ARE ADDED BECAUSE I WAS NOT ABLE TO UPLOAD ALL THE IMAGES BECAUSE OF POST RESTRICTIONS |