Recessed-magnet flywheel construction for vertical axis wind turbines

A rotor for a vertical axis wind turbine, the rotor comprising:

• a flywheel having first and second faces located opposite one another across a thickness of the flywheel so as to face opposite directions along a central axis passing through said first and second faces, and a circumferential perimeter edge joining the first and second faces together around the central axis at a perimeter of flywheel;
• and
• a series of cavities spaced radially inward from the circumferential perimeter edge and opening into the flywheel from the first face thereof on a path disposed circumferentially about the central axis to carry a series of permanent magnets in the series of cavities with poles of said magnets facing in an axial direction along the central axis;
• wherein the cavities are pocket-shaped cavities recessed into the flywheel from the first face thereof and terminating short of the second face for seating of the magnets against bottom surfaces of the pocket-shaped cavities disposed intermediately between the first and second faces of the flywheel.