Electomagnetism/Generator Questions

  • Context: Undergrad 
  • Thread starter Thread starter BilPrestonEsq
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Discussion Overview

The discussion revolves around the principles of electromagnetism and generator operation, focusing on the relationship between voltage, amperage, wire gauge, and magnetic strength. Participants explore how these factors interact in the context of converting mechanical energy into electrical energy, considering both theoretical and practical implications.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant suggests that voltage is influenced by the number of turns in a coil, the strength of the magnet, and the speed of changing magnetic flux.
  • Another participant agrees that stronger magnets and more turns in the coil increase voltage amplitude and notes that the rate of change in flux density also affects frequency.
  • A participant raises a question about the factors affecting amperage output, specifically whether wire gauge is the only consideration and how load impacts amperage.
  • It is proposed that a generator has a maximum power output determined by the energy conversion efficiency, which in turn defines the maximum amperage output based on load.
  • Participants discuss the relationship between wire gauge, ampacity, and the voltage required to produce a specific power output from a generator.
  • There is a consideration of how replacing a magnet with a stronger one affects the power output equation, with questions about the trade-offs between voltage and amperage.
  • One participant reflects on the implications of design choices in generator construction, particularly regarding the balance between voltage and current based on the strength of the magnet.

Areas of Agreement / Disagreement

Participants express various viewpoints on the relationships between voltage, amperage, and design factors in generators, with no clear consensus reached on the effects of stronger magnets or the specific dynamics of power output.

Contextual Notes

Participants acknowledge the complexity of the relationships involved, including assumptions about efficiency and the interplay between different design parameters, but do not resolve these complexities.

BilPrestonEsq
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Hello all, I have a question. Now I'm not sure if I have this right, voltage relates to the number of turns in a coil or more specifically linear centimeters of wire perpendicular to the magnetic flux of the magnet, also the strength of the magnet, or flux density, and the speed of the varying magnetic flux along the coil. The stronger the magnet, the faster the flux density is changing and the more turns in the coil all equal more voltage? Also this is really my main question: what effects amperage output? Is the gauge of wire the only factor? Will the amps coming out of the generator be only what load I put on it up to the ampacity of the wire. Please help!
 
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Anyone? Am I on track? Does my question make sense? Any kind of input would be most appreciated.
 
BilPrestonEsq said:
The stronger the magnet, the faster the flux density is changing and the more turns in the coil all equal more voltage?
Yes you are right, all those factors increase the amplitude of voltage, though how faster the flux density is changing will affect not only the amplitude but the frequency of voltage too.

Also this is really my main question: what effects amperage output? Is the gauge of wire the only factor? Will the amps coming out of the generator be only what load I put on it up to the ampacity of the wire. Please help!
Each generator has a maximum power output because it converts another form of energy (for example mechanic energy if the generator works with a diesel engine) into electric energy and because conservation of energy holds (if that diesel engine is say 10hp then the generator will have a maximum power output of 10hp=7.35KW). That maximum power output defines a maximum amperage output. The amperage output depends on the load but it cannot exceed the maximum amperage output.
 
Ok i think I get it. So I do understand how mechanical energy converts into watts based on 100% efficiency, but, if I had a alternator wound with 3 gauge wire with the ampacity of 100 amps and another with 12 gauge wire with the ampacity of 25 amps it would take a voltage of 73.5 volts for the 3 gauge and 294 volts for the 12 gauge to produce the 7.35kw out of a 10hp engine? (7350w/100amp=73.5v)(7350w/25amps=294v)
 
So if the mechanical energy delivered to the generator is 10hp and the output(at 100% efficiency) is 7.35kw then the watts could translate into higher amps or higher voltages based on the amount of turns and the ampacity of the wire, basically its just a trade off in the design if the generator. So given a certain force (10hp engine) and a certain number of coil turns and a certain wire gauge what effect does the magnet have on power output? If every factor is the same except you replace magnet with a stronger one how does that stronger magnet effect the equation? hhhmm maybe I don't understand quite yet!:)
 
BilPrestonEsq said:
Ok i think I get it. So I do understand how mechanical energy converts into watts based on 100% efficiency, but, if I had a alternator wound with 3 gauge wire with the ampacity of 100 amps and another with 12 gauge wire with the ampacity of 25 amps it would take a voltage of 73.5 volts for the 3 gauge and 294 volts for the 12 gauge to produce the 7.35kw out of a 10hp engine? (7350w/100amp=73.5v)(7350w/25amps=294v)
Yes correct.
BilPrestonEsq said:
So if the mechanical energy delivered to the generator is 10hp and the output(at 100% efficiency) is 7.35kw then the watts could translate into higher amps or higher voltages based on the amount of turns and the ampacity of the wire, basically its just a trade off in the design if the generator. So given a certain force (10hp engine) and a certain number of coil turns and a certain wire gauge what effect does the magnet have on power output? If every factor is the same except you replace magnet with a stronger one how does that stronger magnet effect the equation? hhhmm maybe I don't understand quite yet!:)

I am not an expert on generators but as you say the watts could translate either into higher amp or higher voltage depending on what we want to do and how we design the generator. A stronger magnet will give bigger voltage thus lowering the maximum current (because the total watts have to be the same) even though the wire gauge could support a higher current (if the gauge was proper and the magnet was weaker so the voltage was lower).
 
Finally it all clicked. There are so many questions to be answered... Thank you so much for your time I really appreciate it!
 

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