Electromagnetic apparatus employing high permeability low conductivity element
AssigneeColeman Powermate, Inc.
InventorHarold C. Scott
Life of this patent
Estimating the term…
Abstract
A pole for use in a magnetic circuit includes a flux-passing portion for passing magnetic flux and a cap. The flux-passing portion has a face through which at least some of the magnetic flux passes and to which the cap is fixed. The cap is made of a permeable material and is formed to impede eddy currents in the cap. The cap may have a top and bottom surface joined by a shoulder to provide a distribution of magnetic flux through the shoulder that is less concentrated than the flux distribution through a 90-degree corner. The pole may be incorporated into a generator, a motor, a linear motor, or a portable engine-driven generator to increase the efficiency thereof.
Claims36
A pole for use in a magnetic circuit, the pole comprising:
- a. a flux-passing portion comprising a face through which magnetic flux passes;
- and
- b. a cap fixed to the face wherein:
- (1) the cap passes the portion of the magnetic flux;
- (2) the cap is formed with a first surface facing the flux-passing portion and a second surface opposite to the first surface, the second surface being joined to the first surface by a shoulder;
- (3) the cap comprises magnetically permeable particles disposed in a binder having lower electrical conductivity than the particles so as to impede eddy currents in the cap;
- (4) the cap has a first thickness having a maximum at the shoulder;
- and
- (5) the shoulder has a radius in the range of 89% to 111% of the thickness at the shoulder.
A pole for use in a magnetic circuit, the pole comprising:
- a. a magnet;
- and
- b. a cap formed with a first surface facing the magnet and a second surface opposite to the first surface, the second surface being joined to the first surface by a shoulder, wherein:
- (1) the cap comprises magnetically permeable particles disposed in a binder having lower electrical conductivity than the particles so as to impede eddy currents in the cap;
- (2) the cap has a maximum thickness at the shoulder;
- and
- (3) the shoulder has a radius in the range of 89% to 111% of the maximum thickness.
A pole for use in a magnetic circuit, the pole comprising:
- a. means for passing magnetic flux comprising a face through which at least a portion of the magnetic flux passes;
- and
- b. a cap fixed to the face, wherein:
- (1) the cap passes the portion of the magnetic flux;
- (2) the cap is formed with a first surface facing the means for passing and a second surface opposite to the first surface, the second surface being joined to the first surface by a shoulder;
- (3) the cap comprises magnetically permeable particles disposed in a binder having lower electrical conductivity than the particles so as to impede eddy currents in the cap;
- (4) the cap has a first thickness having a maximum at the shoulder;
- and
- (5) the shoulder has a radius in the range of 89% to 111% of the thickness at the shoulder.
A pole for use in a magnetic circuit, the pole comprising:
- a. means for passing magnetic flux comprising a face;
- and
- b. a cap fixed to the face, wherein:
- (1) the cap passes a majority of the magnetic flux passed by the means for passing;
- (2) the cap is formed with a first surface facing the means for passing and a second surface opposite to the first surface, the second surface being joined to the first surface by a shoulder;
- (3) the cap comprises magnetically permeable particles disposed in a binder having lower electrical conductivity than the particles so as to impede eddy currents in the cap;
- and
- (4) the cap has an average thickness and has a thickness at the shoulder greater than the average thickness.
A rotor comprising:
- a. a body comprising magnetically permeable material;
- b. a magnetic pole in magnetic communication with the body, the magnetic pole comprising a source of magnetic flux;
- c. a consequence pole in magnetic communication with the body, the consequence pole comprising a base having a first face and a region of the first face where a flux density is expected;
- and
- d. means, fixed to the base, for lowering the flux density in the region, the means comprising magnetically permeable particles disposed in a binder having lower electrical conductivity than the particles so as to impede eddy currents between the particles.
A rotor comprising:
- a. a body comprising magnetically permeable material;
- b. a consequence pole in magnetic communication with the body, the consequence pole having a first face for coupling magnetic flux with a provided stator;
- and
- c. a magnetic pole in magnetic communication with the body, the magnetic pole comprising:
- (1) a base;
- (2) a magnet fixed to the base;
- (3) a second face comprising a region where a flux density is expected;
- and
- (4) means, fixed to the second face, for lowering the flux density in the region, the means comprising magnetically permeable particles disposed in a binder having lower electrical conductivity than the particles so as to impede eddy currents between the particles.
Dependencies are inferred from the claim text.