Methods and systems for a fractional concentrated stator configured for use in electric aircraft motor

Patent metadata

Field	Value
Publication number	US-11799343-B2
Application number	US-202117144304-A
Country	US
Kind code	B2
Filing date	Jan 8, 2021
Priority date	Jan 8, 2021
Publication date	Oct 24, 2023
Grant date	Oct 24, 2023

Abstract

A fractional concentrated stator for use in electric aircraft motor includes an inner and outer cylindrical surface about an axis of rotation comprising different radii. The stator includes a plurality of teeth disposed on the inner cylindrical surface and extending radially inward, the cross-sectional area of each tooth increasing as it extends from the inner cylindrical surface. The stator includes a plurality of modular winding sets, each comprising at least a segment of electrically conductive material wound upon at least a tooth, an inverter providing electrical power to a configurable portion of the stator, and rotor shaft at the axis of rotation disposed coaxially within the stator. The rotor shaft further includes a cylindrical surface facing the inner cylindrical surface of the stator, a plurality of magnets coupled to rotor shaft and coupled to a propulsor and an air gap between the rotor and stator.

First claim

What is claimed is:

1. A fractional slot concentrated motor for electric aircraft, the motor comprising:
a stator, the stator comprising:
an inner cylindrical surface and outer cylindrical surface, wherein:
the inner cylindrical surface and outer cylindrical surface are coaxial about an axis of rotation;
the inner cylindrical surface has a first radius and the outer cylindrical surfaces has a second radius; and
the first radius is different from the second radius;

a plurality of teeth disposed on the inner cylindrical surface and extending radially inward, wherein each tooth of the plurality of teeth has a cross-sectional area, the cross-sectional area increasing as the tooth extends further from the inner cylindrical surface;
a plurality of modular winding sets, each of the plurality of modular winding sets comprising at least a segment of electrically conductive material wound upon at least a tooth of the plurality of teeth and wherein the plurality of modular winding sets are disposed on the stator in a non-radially symmetric pattern;
at least an inverter, wherein:
the at least an inverter provides electrical power to at least a portion of the stator; and
the at least an inverter provides electrical power to a configurable portion of the stator;

a rotor shaft at the axis of rotation, the rotor shaft disposed coaxially within the inner cylindrical surface and rotatable relative to the stator, the rotor shaft comprising;
a cylindrical surface facing the inner cylindrical surface of the stator;
a plurality of permanent magnets mechanically coupled to rotor shaft;
a first end mechanically coupled to a propulsor; and
a plurality of cooling vanes disposed on the rotor shaft, wherein the plurality of cooling vanes lower a temperature of the rotor shaft; and

at least an air gap disposed between the cylindrical surface of the rotor shaft and the inner cylindrical surface of the stator.

2. The motor of claim 1 , wherein the stator includes a through-hole.

3. The motor of claim 1 , wherein the plurality of permanent magnets comprises a Halbach array.

4. The motor of claim 1 , wherein the permanent magnets augment a magnetic field located within a portion of the stator.

5. The motor of claim 1 , wherein the permanent magnets negate a magnetic field located within a portion of the stator.

6. The motor of claim 1 , wherein each of the plurality of modular winding sets comprise one-eighth of the stator.

7. The motor of claim 1 , wherein each of the plurality of modular windings sets comprises a one-fourth of the stator.

8. The motor of claim 1 , wherein each of plurality of modular winding sets includes a plurality of segments of wire wound around two or more of the plurality of teeth.

9. The motor of claim 1 , wherein the at least a segment wound around at least a tooth is parallel to the axis of rotation.

10. The motor of claim 1 , wherein the at least a segment wound around at least a tooth align the magnetic fields of the windings with the magnetic fields produced by the rotor shaft magnets.

11. The motor of claim 1 , wherein the each of the plurality of modular winding sets is driven by an individual power inverter.

12. The motor of claim 1 , wherein at least a portion of the stator is attached to an electric aircraft.

13. The motor of claim 1 , wherein the stator comprises a hollow cylinder.

14. The motor of claim 1 , wherein the plurality of modular winding sets further comprise a plurality of multiphase windings.

15. The motor of claim 1 , wherein the at least a segment is wound upon at least a tooth in a single layer.

16. The motor of claim 1 , wherein the at least a segment is wound upon at least a tooth in a double layer.

17. The motor of claim 1 , wherein at least a tooth is integral to the stator.

18. The motor of claim 1 , wherein the at least a segment of electrically conductive material wound upon at least a tooth comprises Litz wires.

19. The motor of claim 1 , wherein the at least an inverter is disposed on or in at least a portion of the stator.

20. The motor of claim 1 , wherein the rotor shaft comprises an impeller.

Assignees

• Beta Air Llc

Inventors

• Lin Chenjie

Classifications

• H02K3/28 Primary

  Layout of windings or of connections between windings (windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32) · CPC title

• H02K1/12

  Stationary parts of the magnetic circuit · CPC title

• H02K3/50

  Fastening of winding heads, equalising connectors, or connections thereto · 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