Systems and methods for magnetic rotational coupling devices
Improved magnetic rotor assemblies are provided. In one embodiment, a magnetic rotor assembly includes two or more rotor disks. The rotor disks may each contain corresponding sets of permanent magnets, which may be circumferentially disposed around the disks. The disks may then positioned near one another such that the disks are magnetically coupled. In certain instances, the N-poles of the permanent magnets may face one another. In other instances, the S-poles of the permanent magnets may face one another.
1. A device, comprising:
a first rotor assembly and a second rotor assembly each comprising:
a first rotor disk comprising a first disk and a first plurality of permanent magnets circumferentially disposed about an outer perimeter of the first disk such that a first polarity for each permanent magnet of the first plurality of permanent magnets faces outward from a first side of the first disk; and
a second rotor disk comprising a second disk and a second plurality of permanent magnets circumferentially disposed about an outer perimeter of the second disk such that the first polarity for each permanent magnet of the second plurality of permanent magnets faces outward from a first side of the second disk;
wherein the first side of the first disk faces and contacts the first side of the second disk,
wherein the first disk and the second disk are rotated to offset relative positions such that the first plurality of permanent magnets and the second plurality of permanent magnets are in a staggered arrangement,
a first shaft fixedly coupled to the first rotor assembly and positioned to rotate the first rotor assembly in a first plane; and
a second shaft fixedly coupled to the second rotor assembly and positioned to rotate the second rotor assembly in a second plane, different than the first plane, wherein the first plane is separated from the second plane by a predetermined distance such that the first rotor assembly is magnetically coupled to, and not mechanically coupled to, the second rotor assembly.
2. The device of claim 1 , wherein the first disk and the second disk of the first rotor assembly have a first diameter, and wherein the first disk and the second disk of the second rotor assembly have a second diameter, different than the first diameter.
3. The device of claim 1 , wherein the first disk and the second disk of the first rotor assembly have a first diameter, and wherein the first disk and the second disk of the second rotor assembly have the first diameter, wherein the first plurality of permanent magnets and the second plurality of permanent magnets of the first rotor assembly are located a first distance from the first shaft, wherein the first plurality of permanent magnets and the second plurality of permanent magnets of the second rotor assembly are located a second distance from the first shaft, different than the first distance.
4. The device of claim 1 , wherein the first rotor assembly overlaps the second rotor assembly, in a direction orthogonal to respective axes of rotation for the first rotor assembly and the second rotor assembly, by between 1.5 to 2.5 centimeters.
5. The device of claim 1 , wherein the predetermined distance is between 0.125 to 0.635 cm in a direction parallel to respective axes of rotation for the first rotor assembly and the second rotor assembly.
6. The device of claim 1 , further comprising:
a third rotor assembly, also comprising, as the first rotor assembly and the second rotor assembly each comprise:
the first rotor disk comprising the first disk and the first plurality of permanent magnets circumferentially disposed about the outer perimeter of the first disk such that the first polarity for each permanent magnet of the first plurality of permanent magnets faces outward from the first side of the first disk; and
the second rotor disk comprising the second disk and the second plurality of permanent magnets circumferentially disposed about an outer perimeter of the second disk such that the first polarity for each permanent magnet of the second plurality of permanent magnets faces outward from the first side of the second disk;
wherein the first side of the first disk faces and contacts the first side of the second disk,
wherein the first disk and the second disk are rotated to offset relative positions such that the first plurality of permanent magnets and the second plurality of permanent magnets are in a staggered arrangement, and
a third shaft fixedly coupled to the third rotor assembly and positioned to rotate the third rotor assembly in a third plane, different than the second plane, wherein the second plane is separated from the third plane by a second predetermined distance such that the second rotor assembly is magnetically coupled to, and not mechanically coupled to, the third rotor assembly.
7. The device of claim 1 , wherein the first disk and the second disk are made of graphite.
8. The device of claim 1 , wherein:
each permanent magnet of the first plurality of permanent magnets is located a predetermined arc distance from adjacent permanent magnets of the first plurality of permanent magnets about the first disk;
each permanent magnet of the second plurality of permanent magnets is located the predetermined arc distance from adjacent permanent magnets of the second plurality of permanent magnets about the second disk; and
the staggered arrangement offsets the first disk relative to the second disk by half of the predetermined arc distance.
9. The device of claim 1 , wherein each of permanent magnet of the first plurality of permanent magnets and the second plurality of permanent magnets has a first diameter, wherein the first disk and the second disk each have a second diameter, and wherein the first diameter is approximately 1/7 of the second diameter.
10. The device of claim 1 , wherein:
the first rotor assembly is configured with a first radial distance for the first plurality of magnets relative to the first shaft;
the second rotor assembly is configured with a second radial distance for the second plurality of magnets relative to the second shaft; and
the first radial distance is different than the second radial distance.
11. The device of claim 1 , wherein:
the second face of the second rotor assembly overlaps the first face of the first rotor assembly by a second distance,
the second distance is between 0.125 to 0.635 centimeters; and
the predetermined distance is between 1.5 to 2.5 centimeters.
12. A method for magnetic coupling, comprising:
coupling, magnetically and not mechanically, a first rotor assembly with a second rotor assembly;
applying a rotation to a first shaft that is fixedly connected to the first rotor assembly;
transferring, over a gap that separates the first rotor assembly from the second rotor assembly, the rotation to the second rotor assembly via a magnetic coupling between the first rotor assembly and the second rotor assembly,
wherein each of the first rotor assembly and the second rotor assembly include:
a first rotor disk comprising a first disk and a first plurality of magnets circumferentially disposed about an outer perimeter of the first disk such that a first polarity for each permanent magnet of the first plurality of magnets faces outward from a first side of the first disk; and
a second rotor disk comprising a second disk and a second plurality of magnets circumferentially disposed about an outer perimeter of the second disk such that the first polarity for each permanent magnet of the second plurality of magnets faces outward from a first side of the second disk; and
wherein the first side of the first disk faces and contacts the first side of the second disk,
wherein the first disk and the second disk are rotated to offset relative positions such that the first plurality of magnets and the second plurality of magnets are in a staggered arrangement.
13. The method of claim 12 , wherein the rotation is applied to the first shaft at a first angular speed, and is transferred to a second shaft connect to the second rotor assembly at a second angular speed, different than the first angular speed, via the first rotor assembly being configured to position a first plurality of magnets at a first radial location relative to the first shaft and the second rotor assembly being configured to position a second plurality of magnets at a second radial location relative to the second shaft, wherein the first radial location is different than the second radial location.
14. The method of claim 12 , wherein the first shaft is connected on a first end to the first rotor assembly and on a second end, opposite to the first end, to an input source that provides the rotation.
15. The method of claim 12 , wherein the second rotor assembly is connected via a second shaft to an output load.
16. The method of claim 12 , further comprising:
coupling, magnetically and not mechanically, the second rotor assembly with a third rotor assembly; and
transferring, over a second gap that separates the second rotor assembly from the third rotor assembly, the rotation to the third rotor assembly via a second magnetic coupling between the second rotor assembly and the third rotor assembly.