Besides the inevitable electronic controller, the key to the system is a unique device comprising a multiple-pole ring-style permanent magnet, a pole piece, and an electromagnetic coil assembly.
(the key to the system; is; a unique device comprising a multiple-pole ring-style permanent magnet, a pole piece, and an electromagnetic coil assembly) (a unique device; comprising; a multiple-pole ring-style permanent magnet, a pole piece, and an electromagnetic coil assembly)
the key to the system a unique device
is comprising
a unique device comprising a multiple-pole ring-style permanent magnet, a pole piece, and an electromagnetic coil assembly
a multiple-pole ring-style permanent magnet, a pole piece, and an electromagnetic coil assembly