Semi active magnetic bearing

[magneto7]

Hello,
I have a question about how to controll a semi active magnetic bearing system ??

 

[MikeHalloran]

Just go ahead and ask your question.

Mike Halloran
Pembroke Pines, FL, USA

 

[magneto7]

it's a ring of magnets in repulsion with magnets coupled to the electromagnets. the aim is to center the ring magnets by controlling the electromagnets. How to do that??

 

[asimpson]

Sounds like an active magnetic bearing problem to me. Plenty of papers out there on active magnetic systems.

http://www.mcgs.ch/web-content/AMB-chances_and_limit.pdf

Are you considering passive radial bearing with active axial, or other way around? Or have I got wrong end of the rabbit?

Problem I see is passive magnetic systems like in a pair of radial bearings need to be stabilized with great precision axially. This is often done with jewel bearings and the axial loading is small. To do this with a active control system would be extravagant.

Active systems are used with pm bearings in Halbach arrays for levitation.

 

[magneto7]

i'm not considering passive radial bearing with active axial.

Passive radial bearing is to get magnetic damping

the electromagnets are here just tu control the repulsive force between the magnets.
The mobile part (magnet ring) have te be centred.

 

[magneto7]

Simply
what i'm looking for is the electronic circuits for this type of system

 

[MikeHalloran]

What did your faculty advisor suggest?



Mike Halloran
Pembroke Pines, FL, USA

 

[FeX32]

I agree with asimpson.
you say semi- active. This implies changing the passive elements actively.
I think you want to actively control the MBs. You would need to design a nice little control system for it. This has been done before. Look up maglev systems.


Fe