Patent ID: 7696664

Claim:
A magnetic path closed electric generator, comprising a base, a housing, a stator, a rotator, a rotation shaft and a transmission wheel, wherein the rotator is made up of a magnetic body, a magnetic permeability material and a fixing part, and is fixed to the rotation shaft; the rotation shaft and the housing are in slip connection; one end of the rotation shaft is fixed to the transmission wheel for inputting power; the stator is fixed to the housing; the housing is made up of magnetic permeability material and serves as mechanical support of a rotating part; a coil winding is disposed on the stator and is fixed to a magnetic permeability bracket; one frame hollow portion of the magnetic permeability bracket hitches outside a magnetic permeability neck on the stator; a low magnetic permeability medium is disposed between the magnetic permeability bracket and the magnetic permeability neck on the stator to keep them in a certain distance; the transmission wheel drives the rotator to rotate by the rotation shaft; a magnetic permeability boot and the magnetic permeability neck on the stator are inducted by the magnetic body on the rotator to permeate magnetic; with a magnetic flux change of magnetic lines within the coil winding, the winding coil is inducted to generate electric current; the low magnetic permeability medium is disposed between the magnetic permeability bracket and the magnetic permeability neck to separate them in a certain distance; the magnetic lines tend to pass through the magnetic permeability material which is easiest to pass; the magnetic lines and a magnetic field generated by the electric current in the coil winding concentrate at the magnetic permeability bracket and pass through it; the magnetic permeability boot fixed to the stator does not have the magnetic field generated by the coil winding to impede rotation of the rotator; and there is only small magnetic attracting force between the rotator and the stator.