Permanent magnet rotor synchronous motor

Claim 2

A synchronous motor comprising: a disc shaped rotor comprised of a low density material of high retentivity and having a low moment of inertia and a large magnetic area to provide a high output relative to the moment of inertia thereof, said magnetic area including an annular ring of permanently magnetized poles extending through the thickness and about the periphery thereof, each of said poles being magnetized axially and having a pole of opposite polarity positioned contiguously on 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 energiZing winding being coupled to said stator core for providing an energizing alternating 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.

Claim 3

The motor of claim 1 wherein said annular magnetized poles of said rotor are integral with said rotor.

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 forming a plurality of pole pairs with each pole pair having the approximate configuration of said rotor poles.

Claim 7

The motor of claim 5 wherein said pole faces are aligned co-axially with said rotor and are rigidly secured to said stator core.

Claim 8

A battery operated self-starting synchronous timer motor for powering an automobile clock comprising: a disc shaped rotor comprised of a low density material of high retentivity and having a low moment of inertia and a large magnetic area to provide a high output relative to the moment of inertia thereof, said magnetic area including an annular ring of permanently magnetized poles extending through the thickness and about the periphery thereof, each of said poles being magnetized axially and having a pole of opposite polarity positioned contiguously on 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 energizing winding being coupled to said stator core for providing an energizing alternating 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 surfaces of said stator poles.

Claim 9

A battery operated self-starting synchronous timer motor for powering an automobile clock comprising: a disc shaped rotor comprised of a low density material of high retentivity and having a low moment of inertia and a large magnetic area to provide a high output relative to the moment of inertia thereof, said magnetic area including an annular ring of permanently magnetized poles extending through the thickness and about the periphery thereof, each of said poles being magnetized axially and having a pole of opposite polarity positioned contiguously on 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 energizing winding being coupled to said stator core for providing an energizing alternating 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 surfaces of said stator poles.

Claim 10

The motor of claim 7 wherein said annular magnetized poles of said rotor are integral with said rotor.

Claim 11

The motor of claim 8 further comprising circuit means for providing an AC energizing signal to said energizing winding, said circuit means including a crystal controlled oscillator, a frequency divider means for dividing the frequency of the output of said oscillator, and drive means responsive to said divider means for energizing said windings.

Claim 12

The motor of claim 8 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.