Linear Motor Equations

  • #1
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Main Question or Discussion Point

I am trying to calculate the power required and resulting force for a linear motor, but I have been unsuccessful in finding the necessary equations.
 

Answers and Replies

  • #2
NascentOxygen
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If you provide details of the linear motor you are considering, maybe someone will be able to help.
 
  • #3
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A tube with wire-wrapping to generate the magnetic fields which act on a magnetized cylinder. I would like to move the cylinder through the magnetized tube.

Thank you.
 
  • #4
NascentOxygen
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A tube with wire-wrapping to generate the magnetic fields which act on a magnetized cylinder. I would like to move the cylinder through the magnetized tube.
You have the youtube link? Otherwise, most engineers will associate the term with a 3 phase device.
 
  • #5
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Something like this:
I am specifically looking at the part where the brass rod is moving.
 
  • #6
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Something like this:
I am specifically looking at the part where the brass rod is moving.
You'll hardly find exact equations for something like that. Maybe, there are some aproximative formulae based on numerical simul, but I don't remember if I ever saw them. Sorry :(
 
  • #7
NascentOxygen
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A tube with wire-wrapping to generate the magnetic fields which act on a magnetized cylinder. I would like to move the cylinder through the magnetized tube.
Are there details of the construction? It appears that the brass tube houses 16 concealed magnets. That (upside-down so we can't see) circuit board houses his electronic circuitry. The two wires going to the coils may be multistrand, so actually 4 or more separate phases/wires.
 
  • #8
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Here is where I found the video. I was looking for a "how-to" on building a linear motor, and this was a top hit on Google.

http://hackaday.com/2013/02/04/building-a-linear-motor/

I liked it because it showed what I am looking for. But I cannot find anything on how to calculate the power required or the force generated. I imagine force is related to power and inductance (also related to power?), but I have been unable to find a set of equations to use in determining the design parameters.
 
  • #10
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That is the concept, but I am looking for how much power to apply, the magnetic field generated, and the total force exerted on the body moving through the tube. I believe there is some set of governing equations that I can use to describe the system, I just have not been able to find them. I will keep looking, though.
 

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