How many magnets do I need to generate 1 kW of power using neodymium magnets?

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SUMMARY

The discussion focuses on determining the number of neodymium magnets required to generate 1 kW of power, sufficient to light ten 100-watt bulbs. Key properties of the magnets include a residual magnetism (Br) of 1.08-1.12 Tesla, coercive field strength ranging from 9.8-10.5 kOe, and an energy product of 28-30 MGOe. Participants clarify that there is no direct conversion between the number of magnets and power output, as commercial generators typically do not use permanent magnets. The conversation emphasizes the complexity of calculating power generation from magnets.

PREREQUISITES
  • Understanding of neodymium magnet specifications, including residual magnetism and coercive field strength.
  • Familiarity with energy product calculations in MGOe.
  • Basic knowledge of electrical power generation concepts.
  • Awareness of the limitations of permanent magnets in commercial electric generators.
NEXT STEPS
  • Research the principles of electromagnetic induction and its application in generators.
  • Explore the calculations for power output based on magnet specifications.
  • Learn about the design and efficiency of electric generators using different types of magnets.
  • Investigate alternative methods for generating electricity without permanent magnets.
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Engineers, hobbyists, and researchers interested in renewable energy solutions, particularly those exploring the use of neodymium magnets for power generation.

Newpenny
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Hi guys and girls :)

I'm trying to answer the following question: you are trying to generate a number of watts of energy using neodymium magnets. Let's say you are looking to reach 1000watts, so that you could have 10 light bulbs of 100wats each working. The magnets have some characteristics, like: strength (in kg), diam+height (in mm), energy product (in MGOe), and so on.
So, the question would be: how many magnets of a particular type does one need to generate enough power to light 10 light bulbs of 100wats each (so 1 kW)? Also, vice-versa, if one has 30 magnets let's say, how many Watts can you generate?

To make this easier, let's consider an example. One magnet has the following properties:
1. Residual magnetism (Br) has 10800-11200 Gauss or 1.08-1.12 Tesla;
2. Coercive field strength is:
2.1: bHc ... kOe (9.8-10.5), kA/m (780-836);
2.2: iHc... kOe (>=12); kA/m >=955;
3. Energy product (BxH)max: MGOe 28-30; kJ/m3: 223-239.
 
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Welcome to PF!

Do you mean you want to build your own electric generator? The generators used commercially to make electric power don't utilize permanent magnets.
 
i'm just looking to know how to convert all those cuties into Watts and vice-versa.
 
I'm sorry, but there is no direct relationship, so no such conversion.
 

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