Is it possible by using magnetic field blocking materials to build a motor that runs only on permanent magnets?

 

Say you have metal shaft supported by two bearings on each end. In the middle of this shaft is a permanent magnet with the north side facing out and the south side facing inward toward the shaft.

 

Right across from the magnet on the shaft is another larger permanent magnet that is encased in a magnetic shielding material. Part of this shield can open like a valve to let the large magnetic repulse the magnet on the shaft and then close as the magnet passes around again.

 

Here is an animation to better describe what I just typed.

 

?

no, as to replace the sheild will take as much energy as it takes to revolve the armature, magnetic shielding is Very "Atractive" to magnets, and so requires energy to remove from the field.

magnetic shielding is Very "Atractive" to magnets

 

Which is why you can't shield one magnet from another, only a region from a magnet or vice-versa.