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| John Hill:
I have a power supply lashed up on the bench. 30 amps at 62 volts but I would really like it to be closer to 55 volts. No taps left on the transformer to reduce the voltage. :( |
| awemawson:
Any room on the transformer bobbin to wind any extra coils ? If so connect in opposition to reduce the effective number of turns on the secondary. I've used this technique several times when making phase converters from standard isolating transformers.. Transformer construction needs to be suitable to thread the wire round the bobbin without dismantling. |
| Jonfb64:
How about winding a new secondary onto a microwave transformer. It's easy to remove the old secondary which leaves plenty of room to wind a new one. I have used one to make a small 800 amp spot welder. Check out YouTube plenty of info of stripping one out. Jon |
| John Hill:
No room to poke any any turns on the secondary but I might be able to get the desired result by winding a few turns off, maybe tomorrow. Perhaps I will look at a microwave transformer after that! |
| John Hill:
I managed a little surgery on the transformer taking 5 turns off the top of the secondary, no load voltage is now 56 volts which I thought would be comfortably within the 60V spec of the driver however stalling the motor causes the driver to go into alarm, I dont know if that is over voltage or over current. :palm: |
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