Synchronous reluctance motor

Patent metadata

Field	Value
Publication number	US-11955843-B2
Application number	US-202117559990-A
Country	US
Kind code	B2
Filing date	Dec 22, 2021
Priority date	Dec 22, 2021
Publication date	Apr 9, 2024
Grant date	Apr 9, 2024

Abstract

The present disclosure relates to a motor. The motor can include a stator defining an interior space, a rotor disposed in the interior space of the stator. The rotor can include a body defining a structure and a plurality of magnets disposed in the plurality of cavities. In some embodiments, the structure defines a plurality of cavities in the body of the rotor, the plurality of cavities includes at least a first cavity and a second cavity, the first cavity is spaced radially outward from the second cavity, and a thickness of the first cavity is larger than a thickness of the second cavity. In some embodiments, at least some of the cavities of the plurality of cavities have a magnet from the plurality of magnets disposed therein.

First claim

What is claimed is:

1. A motor, comprising:
a stator defining an interior space;
a rotor disposed in the interior space of the stator, wherein the rotor includes:
a body defining a structure, wherein the structure defines a plurality of cavities in the body of the rotor,
wherein the plurality of cavities comprises:
a first cavity,
a second cavity, and
a third cavity,
wherein the first cavity is spaced radially outward from the second cavity and the third cavity, and the second cavity is spaced radially outward from the third cavity, and
wherein a thickness of the first cavity is larger than a thickness of the second cavity and a thickness of the third cavity,
wherein the thickness of the second cavity is larger than the thickness of the third cavity;
wherein the thickness of the second cavity is larger than a thickness for a cavity spaced radially inward from the second cavity and the third cavity; and
a plurality of magnets disposed in the plurality of cavities,
wherein at least some of the cavities of the plurality of cavities have a magnet from the plurality of magnets disposed therein.

2. The motor of claim 1 ,
wherein the thickness of the first cavity is larger than any other thickness of the plurality of cavities.

3. The motor of claim 2 ,
wherein the first cavity is spaced radially outward from all of the cavities of the plurality of cavities.

4. The motor of claim 1 ,
wherein the thickness of the first cavity is substantially constant along a length of the first cavity.

5. The motor of claim 1 ,
wherein each cavity of the plurality of cavities comprises a middle portion, a first cavity arm, and a second cavity arm,
wherein the first cavity arm and the second cavity arm extend radially outward from the middle portion.

6. The motor of claim 5 ,
wherein a geometry of the middle portion of the second cavity comprises a concave-shaped portion.

7. The motor of claim 6 ,
wherein the concave-shaped portion of the middle portion has a radius of curvature that substantially follows a profile of an internal surface of the rotor, and
wherein the internal surface of the rotor defines a shaft opening of the rotor.

8. The motor of claim 1 ,
wherein the motor is a synchronous reluctance motor.

9. The motor of claim 1 ,
wherein the plurality of magnets are polymer-bonded magnets.

10. A motor, comprising:
a stator defining an interior space;
a rotor disposed in the interior space of the stator, wherein the rotor includes:
a body defining a structure, wherein the structure defines a plurality of cavities in the body of the rotor,
wherein the plurality of cavities comprises at least a first cavity, a second cavity, and a third cavity,
wherein the first cavity is spaced radially outward from the second cavity and the third cavity, and the second cavity is spaced radially outward from the third cavity,
wherein a thickness of the first cavity is larger than a thickness of the second cavity and the third cavity,
wherein a thickness of the second cavity is larger than a thickness of the third cavity,
wherein each cavity of the plurality of cavities comprises a middle portion, a first cavity arm, and a second cavity arm, and
wherein the first cavity arm and the second cavity arm extend radially outward from the middle portion,
wherein a geometry of the middle portion of the cavity comprises a concave-shaped portion; and
a plurality of magnets disposed in the plurality of cavities, wherein at least some of the cavities of the plurality of cavities has a magnet from the plurality of magnets disposed therein.

11. The motor of claim 10 ,
wherein the thickness of the first cavity is larger than any other thickness of the plurality of cavities.

12. The motor of claim 10 ,
wherein the first cavity is spaced radially outward from all of the cavities of the plurality of cavities.

13. The motor of claim 10 ,
wherein the thickness of the second cavity is larger than the thickness of the third cavity and a thickness for a cavity spaced radially inward from the second cavity and the third cavity.

14. The motor of claim 10 ,
wherein the thickness of the first cavity is substantially constant along a length of the first cavity.

15. The motor of claim 10 ,
wherein the concave-shaped portion of the middle portion has a radius of curvature that substantially follows a profile of an internal surface of the rotor, and
wherein the internal surface of the rotor defines a shaft opening of the rotor.

16. The motor of claim 10 ,
wherein at least one cavity of the plurality of cavities has a non-magnetic polymer disposed therein.

17. The motor of claim 10 , wherein the motor is a synchronous reluctance motor.

18. The motor of claim 10 , wherein the plurality of magnets are polymer-bonded magnets.

Assignees

• Abb Schweiz Ag

Inventors

• Tremelling Darren
• Perigo Elio
• Zhong Sheng
• Mazza Lorenzo
• Hoffman Matthew

Classifications

• H02K1/246 Primary

  Variable reluctance rotors · CPC title

• H02K1/276

  Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] · CPC title

• H02K19/103

  Motors having windings on the stator and a variable reluctance soft-iron rotor without windings · CPC title

• H02K1/2706

  Inner rotors · CPC title