Magnetic gear systems, methods, and apparatuses

Inventors: Hamid A. Toliyat (College Station, TX); Bryton Praslicka (College Station, TX); Daniel Zamarron (Bryan, TX); Matthew C. Gardner (Dallas, TX); Matthew C. Johnson (College Station, TX); Abas Goodarzi (Rolling Hills, CA); Enzo Bauk (Lakewood, CA); Alex Nguyen (Fullerton, CA); Shima Hasanpour (College Station, TX); Godwin Yuan Duan (Plano, TX); Salek Ahmed Khan (Richardson, TX)

Assignees: The Texas A&M University System; Board of Regents, The University of Texas System; The United States of America as Represented by the Secretary of the Army

H02K51/00 H02K16/00 H02K2213/12

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Quick Facts

Patent No.: US 12712423
App. No.: 18/273,941
Granted: Aug 18, 2026
Kind: B2

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Abstract

Aspects of the disclosure relate to a cycloidal magnetic gear. The cycloidal magnetic gear includes an outer rotor. A plurality of magnetic pole pairs is disposed on an inner circumference of the outer rotor. A first, second, and third inner rotor is disposed within the outer rotor. The first, second, and third inner rotors includes a magnetic pole pairs disposed on an outer circumference thereof. The first inner rotor and the third inner rotor have a thickness of approximately half the thickness of the second inner rotor. The first inner rotor, the second inner rotor, and the third inner rotor balance moments acting on a drive shaft.

Claims (32)

1 . A cycloidal magnetic gear comprising:

an outer rotor;

a first plurality of magnetic pole pairs disposed on an inner circumference of the outer rotor;

a first inner rotor disposed within the outer rotor and having a second plurality of magnetic pole pairs disposed on an outer circumference thereof;

a second inner rotor disposed within the outer rotor and having a third plurality of magnetic pole pairs disposed on an outer circumference thereof,

a third inner rotor disposed within the outer rotor and having a fourth plurality of magnetic pole pairs disposed on an outer circumference thereof;

wherein, the first inner rotor and the third inner rotor have a thickness of approximately half the thickness of the second inner rotor; and

wherein, the first inner rotor, the second inner rotor, and the third inner rotor balance moments acting on a drive shaft.

2 . The cycloidal magnetic gear of claim 1 , wherein the outer rotor is stationary.

3 . The cycloidal magnetic gear of claim 1 , wherein the first inner rotor, the second inner rotor, and the third inner rotor revolve in an orbital fashion about a central axis of the outer rotor.

4 . The cycloidal magnetic gear of claim 3 , wherein the first inner rotor, the second inner rotor, and the third inner rotor are coupled to an input shaft, the input shaft being aligned with the central axis of the outer rotor.

5 . The cycloidal magnetic gear of claim 4 , wherein the first inner rotor and the third inner rotor are offset from the central axis of the outer rotor towards a first side of the input shaft.

6 . The cycloidal magnetic gear of claim 5 , wherein the second inner rotor is offset from the central axis of the outer rotor towards a second side of the input shaft.

7 . The cycloidal magnetic gear of claim 6 , wherein offset placement of the first inner rotor, the second inner rotor, and the third inner rotor balances mass and forces acting on the input shaft.

8 . The cycloidal magnetic gear of claim 3 , wherein:

the first inner rotor rotates about a central axis of the first inner rotor;

the second inner rotor rotates about a central axis of the second inner rotor; and

the third inner rotor rotates about a central axis of the third inner rotor.

9 . The cycloidal magnetic gear of claim 8 , wherein rotation of the first inner rotor, the second inner rotor, and the third inner rotor drives a low-speed shaft.

10 . The cycloidal magnetic gear of claim 1 , comprising:

a fifth plurality of magnetic pole pairs disposed around an inner circumference of the outer rotor parallel to the first plurality of magnetic pole pairs; and

a sixth plurality of magnetic pole pairs disposed around an inner circumference of the outer rotor parallel to the first plurality of magnetic pole pairs.

11 . The cycloidal magnetic gear of claim 10 , wherein:

the second plurality of magnetic pole pairs interacts with the first plurality of magnetic pole pairs;

the third plurality of magnetic pole pairs interacts with the fifth plurality of magnetic pole pairs; and

the fourth plurality of magnetic pole pairs interacts with the sixth plurality of magnetic pole pairs.

12 . The cycloidal magnetic gear of claim 11 , wherein, for each revolution of the first inner rotor about a central axis of the outer rotor, the first inner rotor rotates by one pole pair relative to the outer rotor.

13 . A method of assembling a cycloidal magnetic gear, the method comprising:

coupling a first plurality of magnetic pole pairs, a second plurality of magnetic pole pairs, and a third plurality of magnetic pole to an inner circumference of an outer rotor;

coupling a first inner rotor, a second inner rotor, and a third inner rotor to an input shaft;

coupling a fourth plurality of magnetic pole pairs to the first inner rotor, a fifth plurality of magnetic pole pairs to the second inner rotor, and a sixth plurality of magnetic pole pairs to the third inner rotor; and

disposing the first inner rotor, the second inner rotor, and the third inner rotor within the outer rotor such that the fourth plurality of magnetic pole pairs interacts with the first plurality of magnetic pole pairs, the fifth plurality of magnetic pole pairs interacts with the second plurality of magnetic pole pairs, and the sixth plurality of magnetic pole pairs interacts with the third plurality of magnetic pole pairs.