Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
266 words
An axial gap, permanent magnet motor comprising: A. a stator including two adjacent sets of series connected coils wound in quadrature, each set of coils being disposed in a substantially annular configuration about a spin reference axis wherein the axis of each coil is substantially parallel to said spin reference axis, B. a rotor adapted for rotation about a spin axis and including a set of permanent magnets disposed in a substantially annular configuration about said spin axis, said annular configuration of magents having substantially the same mean radius as said annular configuration of coils, and wherein the magnetic moment of each of said magnets is substantially parallel to said spin axis, and wherein the magnetic moments of adjacent magnets in said set are oppositely directed, C. means for positioning said rotor with respect to said stator whereby said annular configuration of magnets is adjacent to said annular configuration of coils so that magnetic flux from said magnets is coupled to said coils, D. means for maintaining said spin reference axis and said spin axis substantially coaxial, E. return means connected to said rotor for establishing a magnetic flux return path therein, said return path completing a circuitous path for magnetic flux passing through said coils, and F. means for exciting said sets of coils including servo means for detecting back emf in said sets of coils and for generating control signals related thereto for driving alternating currents in the respective sets of coils, said currents having a 90° relative phase shift and being in-phase with the detected back emf for the respective sets of coils.
Claim 2
Dependent Claim
266 words
An axial gap, permanent magnet motor comprising: A. a stator including two adjacent sets of series connected coils wound in quadrature, each set of coils being disposed in a substantially annular configuration about a spin reference axis wherein the axis of each coil is substantially parallel to said spin reference axis, B. a rotor adapted for rotation about a spin axis and including a set of permanent magnets disposed in a substantially annular configuration about said spin axis, said annular configuration of magents having substantially the same mean radius as said annular configuration of coils, and wherein the magnetic moment of each of said magnets is substantially parallel to said spin axis, and wherein the magnetic moments of adjacent magnets in said set are oppositely directed, C. means for positioning said rotor with respect to said stator whereby said annular configuration of magnets is adjacent to said annular configuration of coils so that magnetic flux from said magnets is coupled to said coils, D. means for maintaining said spin reference axis and said spin axis substantially coaxial, E. return means connected to said rotor for establishing a magnetic flux return path therein, said return path completing a circuitous path for magnetic flux passing through said coils, and F. means for exciting said sets of coils including servo means for detecting back emf in said sets of coils and for generating control signals related thereto for driving alternating currents in the respective sets of coils, said currents having a 90° relative phase shift and being in-phase with the detected back emf for the respective sets of coils.
Claim 3
Dependent Claim
62 words
A motor according to claim 1 wherein said magnets are entirely on one side of said sets of coils, and wherein said return means includes a first relatively high permeability annular section coupled to the poles of said magnets farthest from said coils, and a second relatively high permeability annular section adjacent to the faces of the coils farthest from the magnets.
Claim 4
Dependent Claim
24 words
A motor according to claim 2 wherein said return means further includes a third relatively high permeability section connecting said first and second sections.
Claim 5
Dependent Claim
104 words
A motor according to claim 1, wherein each of said magnets includes a first permanent magnet element on a first side of said set of coils and a second permanent magnet element on the second side of said set of coils, said first and second elements of each of said magnets having commonly directed, coaxial magnetic moments, and wherein said return means includes a first relatively high permeability annular section coupled to the poles of said first magnet elements farthest from said coils, and a second relatively high permeability annular section coupled to the poles of said second magnetic elements farthest from the coils.