Patent ID: 8426991
Filing Date: 2013-04-23
Classification: F03D,F05B,H02K,Y02E

Abstract:
1. A power generator comprising: a magnet rotor that rotates upon receiving rotating force from a driving source; and a stator coil arranged to face magnetic poles of the magnet rotor, wherein the magnet rotor includes: a rotary shaft rotatably and axially supported by a housing; and a permanent magnet that forms a plurality of magnetic poles on a concentric circle with the rotary shaft at a center, the stator coil includes: a plurality of coreless winding wires arranged to face the magnetic poles formed in the magnet rotor; and a three-phase output terminal that outputs electric power generated in the plurality of winding wires to outside, the plurality of coreless winding wires are formed from three or multiple of three effective output winding wires and connected with the three-phase output terminal through a switching device to enable switching a total number of turns to a large or small value, the switching device is connected to a controlling device in which the total number of turns is reduced when the rotating force from the driving source is large and the total number of turns is increased when the rotating force is small, the magnet rotor has a discoid shape including the rotary shaft at the center and is configured to form magnetic fields in both front and back surface directions, the plurality of coreless winding wires form a pair of coil bodies on front and back sides that are arranged to face each other to sandwich the magnetic poles in the discoid shape from the front and back surface directions, the coil bodies on the front and back sides that are formed of the plurality of winding wires are configured to have substantially same inductance values, and the switching device changes the inductance value to a small value or a large value by connecting the winding wires of one of the coil bodies on the front and back sides to the three-phase output terminal or connecting the winding wires of both the coil bodies on the front and back sides to the same.