Mass Vibrator using a Neodymium cylinder

[jhudler]

This is an electrical question but bear with me for some background.

I have a project creating an epoxy based granite material.
The sphere packing density is quite high with aggregate sizes from 2 to 600 microns.
So that means I'm left with a very thick mix.
Plus the added complication of doing this in a vacuum.

Requirements:

I need to make a shaker/vibrator (freq from 20 to 200 Hz).
Using a motor to vibrate has been tried and it overheats... go figure :)!

Materials:
1 inch diam x 2 inch long Neodymium magnet.
Lots of magnet wire and even a coil winder.

Supposition:
It seems to me that I could mount magnet to base to vibrate, then create a coil around the magnet (with suitable separation) and drive that? I can dissipate the heat with a simple water jacket created from aluminum tubing and encapsulate that with an epoxy mixture designed to conduct heat which would be mounted to the rack in the chamber.

Question:
Is it possible to create a simple voice coil using a cylindrical magnet?
If so given almost 13000 Gauss, how do I calculate the coil parameters (windings,gauge,amps,voltage).

Or do I need to resort to using Axially magnetized magnet like a speaker?

Or perhaps there are other idea out there to help me solve this problem.

Thanks,
Jack

 

[anorlunda]

It sounds like you are trying to reinvent the simple solenoid. It would likely heat up even faster than your motor.

Your best bet is to go back to the motor with eccentric weight approach. The motor you tried before was probably undersized.

To calculate the motor power, you need the mass being shaken, the frequency, and the magnitude of the oscillations.