I’m looking to build my own alternator to test a prototype turbine. I have been informed to build a 3 phase alternator. The magnet is diametrically opposed and will rotate at 30,000 rpm for the initial testing. I’m planning on 3 coils to keep it simple. Maximum theoretical power created by the turbine is 6 hp so the alternator will need the ability to produce 4.5 kilowatts. I can’t find a formula to calculate wire size or number of turns in the coils. Also is there a formula to calculate the amount of heat that will be generated by the alternator
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\$\begingroup\$ There is a lot more to designing a synchronous generator than a couple of formulae, \$\endgroup\$– user80875Commented Dec 12, 2021 at 3:03
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\$\begingroup\$ 30,000 RPM sounds high...? \$\endgroup\$– KristoferACommented Dec 12, 2021 at 3:18
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\$\begingroup\$ @KristoferA I've seen jet engines exceed 100k. (In fact, I had to paint the blades with phosphor so I could measure its in-situ operating temperature on one such jet engine.) If they have an alternator attached, I suppose they would run at the same rate. (The unit I was working on didn't have me investigate that aspect, though.) \$\endgroup\$– jonkCommented Dec 12, 2021 at 4:06
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\$\begingroup\$ Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking. \$\endgroup\$– Community BotCommented Dec 12, 2021 at 4:47
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\$\begingroup\$ It’s design speed is low for a turbine. Yes my homemade jet runs about 96,000 rpm. The trouble with coupling a generating device to a turbine running that high in revs is the forces destroy the rotating assembly of the generator. Running a diametrically opposed tube magnet should alleviate this issue and help with balance. Turbine could run much higher but I wish to limit rpm at this stage. All I’m asking is how to calculate wire diameter and the amount of turns required to build a generator as a dynometer to test turbine efficiency \$\endgroup\$– RipcrowCommented Dec 12, 2021 at 7:49
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