DESIGN: Electrotor-SloMo ~ Motor - Rotor - Permanent Magnet

• Halbach array.
• "The magnet selected was VAC362HR, a neodymium iron boron material, with B_r=1.33 T at 20°C" [DESIGN?]
• "The team fabricated each pole from a set of four magnets, using a wire saw to form the NdFeB material to create a correctly-shaped magnetic field. With 40 poles and four magnets per pole, a total of 320 individual pieces of magnet are required."

• It appears from testing that two magnets, which are serially touching, have a similar strength as one magnet with a length equal to the sum of the two magnets.
• Inserting cardboard (airgap) between the two magnets and between the lower magnet and an iron block does reduce the magnetic attraction, however the magnets still provide good lift.
• When a stack consisting of; magnet, magnet, steel is pulled apart, the 'brake' comes between the magnet and the steel.
• Does an iron cap on one pole change the magnetism at the other pole? It appears that having some iron on one pole may increase the magnetic attraction at the other pole.
• The book [Axial Flux Permanent Magnet Brushless Machines] says "NdFeB PM can now be purchased in the Far East for less than US $20 per kilogram."

• NdFeB ~ There are different grades.

• Can the permanent magnets be produced as isosceles trapezoid, where by the area of the magnet's faces on the outer radius and inner radius of the disk have an equal area but their width and their thickness differ?

The above is out and the one below is in.

• OTHER: Electrical - Motor - Rotor - Permanent Magnet
• AeroVantage ~ Motor - Transverse Flux - Rotor - Halbach Array

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