In order to obtain a magnetic bearing apparatus in which a large cooling effect is exerted by a simple configuration, fins 15 which form an air flow in a rearward direction are disposed in a rear portion and outer diameter of a rotary shaft 1, a generator 16 which converts an air flow produced by rotation of the fins 15 to a compressed vortex flow, and which has an axial through hole is fixed with being separated from the fins 15 by an appropriate gap, and a tube 20 in which the inner diameter is larger than the diameter of the through hole 19 of the generator 16, and which has a control valve 21 at the rear end is provided in rear of the generator 16. Cooling wind is produced by a driving force of the rotary shaft 1. Cooling wind flow paths 22 through which the cooling wind is to be passed, and which axially elongate are formed in the rotary shaft 1.
This is a divisional of application Ser. No. 10/500,572 filed Jul. 1, 2004, which is a National Stage application of PCT/JP2003/08544 filed Jul. 4, 2003. The entire disclosure of the prior application, application Ser. No. 10/500,572 is hereby incorporated by reference.
A wind generator system includes a stationary frame, a shaft, mechanical bearings and a stator and a rotor, along with magnetic components configured to reduce or substantially eliminate various loads imposed on the mechanical bearings by the system and by wind. In particular, magnetic components at a bearing closest to the vanes of attached to the shaft act to impart a force on the shaft opposing gravity. Magnetic components at a bearing along the shaft distal from the vanes act to impart a force on the shaft opposing a bending force exerted by the shaft on the bearing at that point. Additional magnetic components act to oppose gravity adjacent the stator and rotor. Still further magnetic components act to impart a force on the shaft opposing the wind force.
