Patent ID: 6977454

Claim:
A hybrid-secondary uncluttered permanent magnet machine, comprising: a stator having coils for receiving ac electrical power to provide a magnetic field; a permanent magnet rotor spaced from the stator to define a first air gap relative to an axis of rotation for the permanent magnet rotor; a magnetic coupling uncluttered rotor spaced from the permanent magnet rotor to define a second air gap relative to an axis of rotation for the permanent magnet rotor; at least one stationary core and secondary coil spaced from the magnetic coupling uncluttered rotor by a third air gap; wherein the magnetic coupling uncluttered rotor is provided with a plurality of magnetic elements for coupling flux to the secondary coil; and wherein the secondary coil is disposed around an axis of rotation for the rotor to allow induction of a slip energy current in the coil without inducing a rotational energy current.