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

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Discussion Overview

The discussion revolves around the question of how many neodymium magnets are needed to generate 1 kW of power, specifically for lighting ten 100-watt bulbs. Participants explore the characteristics of the magnets and their potential to generate electrical power.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant seeks to determine the number of neodymium magnets required to generate 1 kW of power, providing specific magnet characteristics such as residual magnetism, coercive field strength, and energy product.
  • Another participant questions whether the intention is to build an electric generator, noting that commercial generators typically do not use permanent magnets.
  • A participant expresses a desire to understand the conversion of magnet characteristics into watts and vice versa.
  • One participant asserts that there is no direct relationship for such a conversion, suggesting a lack of straightforward methodology.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the relationship between magnet characteristics and power generation, with some expressing uncertainty about the feasibility of the conversion and others indicating that no direct conversion exists.

Contextual Notes

The discussion highlights limitations in understanding the relationship between magnet properties and electrical power generation, with unresolved assumptions regarding the mechanics of such a conversion.

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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