In essence the concept is that instead of permanent magnets, two electromagnets opposite each other induce the magnetic field around the rotor.
(the concept; is; that instead of permanent magnets, two electromagnets opposite each other induce the magnetic field around the rotor; L:In essence) Context(the concept is,List([11, 25))):(two electromagnets; opposite; each other; T:induce the magnetic field around the rotor)
the concept is,List([11, 25))
the concept two electromagnets
is opposite
that instead of permanent magnets, two electromagnets opposite each other induce the magnetic field around the rotor L:In essence
each other T:induce the magnetic field around the rotor