Synchronous motor

Claim 2

A synchronous motor comprising: a disc shaped motor having an annular ring of permanently magnetized poles extending through the thickness and about the periphery thereof, each of said poles having a pole of opposite polarity positioned contiguously on each side thereof; a stator including a core and an energizing winding, said core having at least one pole pair which defines an axial air gap through which passes the permanently magnetized annular portion of said rotor, said energizing winding being coupled to said stator core for providing an energizing flux field in said core, said flux field passing between said stator poles through said rotor substantially perpendicular to the plane of said rotor, the magnetic field generated by said rotor poles passing through said stator substantially perpendicular to the surface of said stator pole pair; and supplemental flux conducting means carried by said stator, said supplemental flux conducting means including a protrusion extending therefrom in a plane parallel to the plane of said rotor and located adjacent said rotor periphery for enhancing flux flow between rotor and stator during operation.

Claim 3

The motor of claim 1 wherein said rotor is comprised of a low density material of high retentivity and wherein said annular ring of permanently magnetized poles are integral with and magnetized axially of said rotor, said rotor thereby having a low moment of inertia and a large magnetic working area, and said supplemental flux conducting means adjacent said rotor poles carried by and as an integral portion of said stator, said motor thereby providing a high torque output relative to the moment of inertia thereof.

Claim 4

The motor of claim 2 wherein the rotor material consists of barium ferrite powder mixed with a low density binder.

Claim 5

The motor of claim 2 wherein said stator has only one stator pole pair.

Claim 6

The motor of claim 2 wherein said stator core includes a pair of complementary pole pieces, said pole pieces forming a plurality of pole pairs with each pole pair having the approximate configuration of said rotor poles.

Claim 7

A synchronous motor comprising a disc shaped rotor having an annular ring of permanently magnetized poles extending through the thickness thereof, each of said poles having a pole of opposite polarity positioned contiguously to each side thereof, and a stator including a core and an energizing winding, said core having at least one pole pair which defines an axial air gap through which passes the permanently magnetized annular portion of said rotor, said poles each having a protrusion extending therefrom in a plane parallel to the plane of said rotor, said energizing winding being coupled to said stator core for providing an energizing flux field in said core, said flux field passing between said stator poles through said rotor substantially perpendicular to the plane of said rotor but with a slight perturbation thereof due to said protrusion to thereby prevent locking of said rotor with respect to said stator, the magnetic fields generated by said rotor poles passing through said stator substantially perpendicular to the surface of said stator pole pair.

Claim 8

A synchronous motor comprising a disc shaped rotor having an annular ring of permanently magnetized poles extending through the thickness thereof, each of said poles having a pole of opposite polarity positioned contiguously to each side thereof, and a stator including a core and an energizing winding, said core having at least one pole pair which defines an axial air gap through which passes the permanently magnetized annular portion of said rotor, said poles each having a protrusion extending therefrom in a plane parallel to the plane of said rotor, said energizing winding being coupled to said stator core for providing an energizing flux field in said core, said flux field passing between said stator poles through said rotor substantially perpendicular to the plane of said rotor but with a slight perturbation thereof due to said protrusion to thereby prevent locking of said rotor with respect to said stator, the magnetic fields generated by said rotor poles passing through said stator substantially perpendicular to the surface of said stator pole pair.

Claim 9

The motor of claim 6 wherein said rotor is comprised of a low density material having a high retentivity and wherein said annular magnetized poles of said rotor are integral with said rotor, said rotor thereby having a low moment of inertia and a large magnetic working area, said motor thereby providing a high torque output relative to the moment of inertia thereof.

Claim 10

The motor of claim 6 wherein the rotor material consists of barium ferrite powder mixed with a low density binder.

Claim 11

The motor of claim 6 wherein said stator has only one stator pole pair.

Claim 12

A synchronous motor comprising: a disc shaped rotor comprised of a low density material having a high retentivity, said rotor having an annular ring of permanently magnetized poles extending through the thickness, about the periphery and integral with said rotor, said rotor thereby having a low moment of inertia and a large magnetic working area, each of said poles having a pole of opposite polarity positioned contiguously on each side thereof; a stator including a core including a pair of complementary pole pieces and an energizing winding, said pole pieces forming a plurality of pole pairs which define an axial air gap through which passes the permanently magnetized annular portion of said rotor, each pole piece being rigidly secured to said stator core and aligned coaxially with said rotor, each said pole piece further having the approximate configuration of said rotor poles, said energizing winding being coupled to said stator core for providing an energizing flux field in said core, said flux field passing between said stator poles through said rotor substantially perpendicular to the plane of said rotor, the magnetic fields generated by said rotor poles passing through said stator substantially perpendicular to the surface of said stator pole pair; and supplemental flux conducting means carried by said stator, said supplemental flux conducting means comprised of a protrusion formed out of and integral with said stator, said supplemental flux conducting means located adjacent said rotor poles and extending in the direction of rotor rotation for enhancing flux flow between rotor and stator, said motor thereby providing a high torque output relative to the moment of inertia thereof.

Claim 13

A synchronous motor comprising: a disc shaped rotor comprised of a low density material having a high retentivity, said rotor having an annular ring of permanently magnetized poles extending through the thickness, about the periphery and integral with said rotor, said rotor thereby having a low moment of inertia and a large magnetic working area, each of said poles having a pole of opposite polarity positioned contiguously on each side thereof; a stator including a core including a pair of complementary pole pieces and an energizing winding, said pole pieces forming a plurality of pole pairs which define an axial air gap through which passes the permanently magnetized annular portion of said rotor, each pole piece being rigidly secured to said stator core and aligned coaxially with said rotor, each said pole piece further having the approximate configuration of said rotor poles, said energizing winding being coupled to said stator core for providing an energizing flux field in said core, said flux field passing between said stator poles through said rotor substantially perpendicular to the plane of said rotor, the magnetic fields generated by said rotor poles passing through said stator substantially perpendicular to the surface of said stator pole pair; and supplemental flux conducting means carried by said stator, said supplemental flux conducting means comprised of a protrusion formed out of and integral with said stator, said supplemental flux conducting means located adjacent said rotor poles and extending in the direction of rotor rotation for enhancing flux flow between rotor and stator, said motor thereby providing a high torque output relative to the moment of inertia thereof.

Claim 14

A synchronous motor comprising: a disc shaped rotor comprised of a low density material having a high retentivity, said rotor having an annular ring of permanently magnetized poles formed integrally therewith and extending through the thickness thereof, said rotor thereby having a low moment of inertia and a large magnetic working area, said motor thereby providing a high torque output relative to the moment of inertia thereof, each of said poles having a pole of opposite polarity positioned contiguously to each side thereof; and a stator including a core and an energizing winding, said stator core including a pair of complementary pole pieces, said pole pieces forming a plurality of pole pairs which define an axial air gap through which passes the permanently magnetized annular portion of said rotor, each pole pair having the approximate configuration of said rotor poles and having a protrusion extending from one side thereof in a plane parallel to the plane of said rotor and in a direction parallel to the direction of rotation of said rotor, said energizing winding being coupled to said stator core for providing an energizing flux field in said core, said flux field passing between said stator poles through said rotor substantially perpendicular to the plane of said rotor but with a slight perturbation thereof due to said protrusion to thereby prevent blocking of said rotor with respect to said stator, the magnetic fields generated by said rotor poles passing through said stator substantially perpendicular to the surface of said stator pole pair, said motor thereby providing a high torque output relative to the moment of inertia thereof.

Claim 15

A synchronous motor comprising: a disc shaped rotor comprised of a low density material having a high retentivity, said rotor having an annular ring of permanently magnetized poles formed integrally therewith and extending through the thickness thereof, said rotor thereby having a low moment of inertia and a large magnetic working area, said motor thereby providing a high torque output relative to the moment of inertia thereof, each of said poles having a pole of opposite polarity positioned contiguously to each side thereof; and a stator including a core and an energizing winding, said stator core including a pair of complementary pole pieces, said pole pieces forming a plurality of pole pairs which define an axial air gap through which passes the permanently magnetized annular portion of said rotor, each pole pair having the approximate configuration of said rotor poles and having a protrusion extending from one side thereof in a plane parallel to the plane of said rotor and in a direction parallel to the direction of rotation of said rotor, said energizing winding being coupled to said stator core for providing an energizing flux field in said core, said flux field passing between said stator poles through said rotor substantially perpendicular to the plane of said rotor but with a slight perturbation thereof due to said protrusion to thereby prevent blocking of said rotor with respect to said stator, the magnetic fields generated by said rotor poles passing through said stator substantially perpendicular to the surface of said stator pole pair, said motor thereby providing a high torque output relative to the moment of inertia thereof.