*** I had posted this in Magnetics. I think this is the more
appropriate group. ***

Hi,

I am working on a project that requires 2 electro-magnets facing like
poles maintain a constant force as they move close or away from each
other.
The maximum distance between the 2 would be about 15 cm.
I am struggling to find a way to control the current flowing in the 2
electro-magnets based on the force between them.

Is there anyway to do this?
Is there an existing device to balance the force between the 2
electromagnets..

Thanks in advance for your help.

Use a force controlled voltage to control the current in a negative feed
back loop.

On Feb 1, 5:05 am, "Chris" <anonym...@noserver.com> wrote:

Use a force controlled voltage to control the current in a negative feed
back loop.

You understand what Chris is saying here? You mount the electromagnets
on force sensors and use that output in a feedback loop to regulate
the magnet current such that it keeps the force at a set point
regardless of the non-linearity of the magnetic action with distance.
Pretty simple except for the matter of how fast the system responds to
changes. The inductance of the coils will tend to slow the response
and you didn't bother to specify any speed parameters.

On Feb 1, 1:45 pm, Benj <bjac...@iwaynet.net> wrote:

On Feb 1, 5:05 am, "Chris" <anonym...@noserver.com> wrote:

Use a force controlled voltage to control the current in a negative feed
back loop.

You understand what Chris is saying here? You mount the electromagnets
on force sensors and use that output in a feedback loop to regulate
the magnet current such that it keeps the force at a set point
regardless of the non-linearity of the magnetic action with distance.
Pretty simple except for the matter of how fast the system responds to
changes. The inductance of the coils will tend to slow the response
and you didn't bother to specify any speed parameters.

I have been trying for the last few hours to post a reply.. but i keep
getting some error.. here is another effort..

I haven't worked out the speed yet. One plate would be stationary and
the other one would move at the speed of about 10cm in 0.05sec or
probably a little faster.

Thanks!