Super-synchronous motor/generator

Patent metadata

Field	Value
Publication number	US-11329537-B2
Application number	US-201916401430-A
Country	US
Kind code	B2
Filing date	May 2, 2019
Priority date	May 2, 2019
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

A compound motor-generator system including a first motor-generator and a second motor-generator. The first motor generator includes a stator having a set of three-phase field windings and a first rotor disposed inside and coaxial with the stator and configured to rotate relative to the stator. The second motor-generator includes a rotational stator and a second rotor coupled to a common shaft with the rotor of the first motor-generator and disposed inside and coaxial to the rotational stator. The rotational stator is configured to rotate relative to the second rotor and at a higher rotational speed than the second rotor.

First claim

The invention claimed is:

1. A compound motor-generator system comprising:
a stator having a first set of three-phase field windings;
a first rotor disposed inside and coaxial with the stator, the first rotor configured to rotate relative to the stator; and
a second rotor disposed inside and coaxial with the first rotor, the first rotor or the second rotor having a second set of three-phase field windings, the second rotor configured to rotate relative to the first rotor and at a higher rotational speed than the first rotor when the first set of three-phase field windings and the second set of three-phase field windings are each energized.

2. The system of claim 1 , wherein the first rotor includes permanent magnets to supply a rotor magnetic field that is stationary with respect to the first rotor, and
wherein the second rotor includes the second set of three-phase field windings, the second set of three-phase field windings being configured to produce, when driven by an electrical power source, a rotational magnetic flux that rotates, relative to the second rotor, in a direction opposite to a direction of rotation of the first rotor.

3. The system of claim 1 , wherein the first rotor includes the second set of three-phase field windings, the second set of three-phase field windings being configured to produce, when driven by an electrical power source, a magnetic flux that rotates relative to the first rotor, and
wherein the second rotor includes permanent magnets or DC field windings configured to produce a magnetic field that is stationary relative to the second rotor.

4. The system of claim 1 , wherein the second rotor is coupled to a prime mover or to a mechanical energy storage mechanism.

5. The system of claim 1 , wherein the stator and the first rotor operate as a synchronous machine.

6. The system of claim 1 , wherein the first rotor and the second rotor operate as a synchronous machine.

7. The system of claim 1 , further comprising an auxiliary motor coupled to the first rotor or to the second rotor as a starting motor.

8. The system of claim 1 , wherein the second rotor is configured to rotate at a rotational speed that is approximately twice the rotational speed of the first rotor.

9. The system of claim 1 , wherein energization of each of the first set of three-phase field windings and the second set of three-phase field windings generates a rotating magnetic flux that provides a motive force for the rotation of the second rotor.

10. A compound motor-generator system comprising:
a first motor-generator comprising:
a stator having a first set of three-phase field windings, and
a first rotor disposed inside and coaxial with the stator and configured to rotate relative to the stator;

a second motor-generator comprising:
a first rotational stator, and
a second rotor coupled to a common shaft with the first rotor of the first motor-generator and disposed inside and coaxial to the first rotational stator,

wherein the first rotational stator is configured to rotate relative to the second rotor and at a higher rotational speed than the second rotor;
a third motor-generator comprising:
a second rotational stator coupled to the first rotational stator of the second motor-generator, and
a third rotor disposed inside and coaxial with the second rotational stator and configured to rotate relative to the second rotational stator,

wherein the second rotational stator is configured to rotate relative to the third rotor and to drive the third rotor at a higher rotational speed than the rotational speed of the second rotational stator.

11. The system of claim 10 , wherein the second rotor includes permanent magnets to supply a rotor magnetic field, and
wherein the first rotational stator includes a second set of three-phase field windings, the second set of three-phase field windings being configured to produce, when driven by an electrical power source, a rotational magnetic flux that rotates in a direction opposite to a direction of rotation of the second rotor.

12. The system of claim 10 , wherein the second rotor includes a second set of three-phase field windings, the second set of three-phase field windings being configured to produce, when driven by an electrical power source, a magnetic flux that rotates relative to the second rotor, and
wherein the rotational stator includes permanent magnets or DC field windings configured to produce a magnetic field that is stationary relative to the rotational stator.

13. The system of claim 10 , wherein the third rotor is coupled to a prime mover or to a mechanical energy storage mechanism.

14. The system of claim 10 , wherein the first motor-generator and the second motor-generator are synchronous electric machines.

15. The system of claim 10 , wherein the first motor-generator and the second motor-generator are induction machines.

16. The system of claim 10 , further comprising an auxiliary motor coupled to the first motor-generator as a starting motor.

17. The system of claim 10 , wherein the first rotational stator is configured to rotate at a rotational speed that is approximately twice the rotational speed of the second rotor.

18. The system of claim 10 , wherein the first rotational stator or the second rotor include a second set of three-phase field windings, wherein energization of each of the first set of three-phase field windings and the second set of three-phase field windings generates a rotating magnetic flux that provides a motive force for the rotation of the first rotational stator.

Assignees

• X Dev Llc

Inventors

• Casey Leo Francis
• Xin Siyuan

Classifications

• H02K16/025 Primary

  with rotors and moving stators connected in a cascade (cascade arrangement of an asynchronous motor with another dynamo-electric motor or converter H02K17/34) · CPC title

• H02K16/00

  Machines with more than one rotor or stator {(machines for transmitting mechanical power from a driving shaft to a driven shaft and comprising structurally interrelated motor and generator parts H02K51/00; permanent magnet machines with multiple rotors or stators relatively rotated for vectorially combining the excitation fields or the armature voltages H02K21/029)} · CPC title

• H02K16/005

  Machines with only rotors, e.g. counter-rotating rotors (DC commutator machines or universal AC/DC commutator motors having a rotating armature and a rotating excitation field H02K23/60) · CPC title

• H02K47/20 Primary

  Motor/generators · CPC title