Shaft structure with adjustment portions for alignment with rotor center of gravity

Patent metadata

Field	Value
Publication number	US-11239726-B2
Application number	US-201916731177-A
Country	US
Kind code	B2
Filing date	Dec 31, 2019
Priority date	Jan 2, 2019
Publication date	Feb 1, 2022
Grant date	Feb 1, 2022

Abstract

The embodiments of the present disclosure provide a shaft structure of a motor, comprising a housing, a stator disposed inside the housing, and a rotor rotatably disposed inside the stator. The stator may comprise a stator core and a coil wound around the stator core, and the rotor may comprise a rotor core and a rotational shaft coupled to the rotor core. The rotational shaft may comprise a plurality of adjusting portions formed on an outer circumferential surface of the rotational shaft to align a center of gravity of the rotor with a center of the rotational shaft.

First claim

What is claimed is:

1. A shaft structure of a motor, the structure comprising:
a housing;
a stator disposed inside the housing, the stator comprising a stator core and a coil wound around the stator core; and
a rotor rotatably disposed inside the stator, the rotor comprising a rotor core and a rotational shaft coupled to the rotor core,
wherein the rotational shaft comprises a plurality of adjusting portions formed on an outer circumferential surface of the rotational shaft to align a center of gravity of the rotor with a center of the rotational shaft, wherein:
the plurality of adjusting portions comprise grooves in a shape of a slot,
the plurality of adjusting portions are recessed by different volumes relative to each other based on distances from the center of gravity of the rotor,
one adjusting portion of the plurality of adjusting portions is spaced a first distance from the center of gravity of the rotor,
another adjusting portion of the plurality of adjusting portions is spaced a second distance from the center of gravity of the rotor, the second distance being greater than the first distance, and
the one adjusting portion is recessed by a volume greater than that of the another adjusting portion.

2. The motor of claim 1 , wherein the volumes, at which the plurality of adjusting portions are recessed, increase toward the center of gravity of the rotor.

3. The motor of claim 1 , wherein the volumes, at which the plurality of adjusting portions are recessed, decrease away from the center of gravity of the rotor.

4. The structure of claim 1 , wherein the plurality of adjusting portions have different widths based on distances to the center of gravity of the rotor.

5. The structure of claim 4 , wherein the plurality of adjusting portions have larger widths closer to the center of gravity of the rotor.

6. The structure of claim 4 , wherein the plurality of adjusting portions are disposed in an axial direction of the rotational shaft.

7. The structure of claim 6 , wherein the rotor core comprises protrusions formed on an inner circumferential surface of the rotor core, the protrusions being configured to be inserted into the plurality of adjusting portions, respectively.

8. The structure of claim 7 , wherein the protrusions are disposed in an axial direction of the rotor core corresponding to the plurality of adjusting portions.

9. A motor comprising:
a housing having a space;
a stator disposed in the space of the housing; and
a rotor rotatably disposed inside the stator,
wherein the rotor comprises a rotor core and a rotational shaft inserted through the rotor core,
the rotational shaft comprises a plurality of adjusting portions recessed into an outer circumferential surface of the rotational shaft in a radial direction,
the plurality of adjusting portions are formed by a predetermined length along an axial direction of the rotational shaft, wherein:
the plurality of adjusting portions are recessed by different widths relative to one another based on distances from a center of gravity of the rotor,
one adjusting portion of the plurality of adjusting portions is spaced a first distance from the center of gravity of the rotor,
another adjusting portion of the plurality of adjusting portions is spaced a second distance from the center of gravity of the rotor, the second distance being greater than the first distance, and
the one adjusting portion is recessed by a width greater than that of the another adjusting portion.

10. The motor of claim 9 , wherein the widths, at which the plurality of adjusting portions are recessed, increase toward the center of gravity of the rotor.

11. The motor of claim 9 , wherein the widths, at which the plurality of adjusting portions are recessed, decrease away from the center of gravity of the rotor.

12. The motor of claim 9 , wherein the plurality of adjusting portions are recessed by different volumes relative to one another based on distances from the center of gravity of the rotor.

13. The motor of claim 12 , wherein the volumes, at which the plurality of adjusting portions are recessed, increase toward the center of gravity of the rotor.

14. The motor of claim 12 , wherein the volumes, at which the plurality of adjusting portions are recessed, decrease away from the center of gravity of the rotor.

15. The motor of claim 12 , wherein:
one of the plurality of adjusting portions is spaced a first distance from the center of gravity of the rotor,
another adjusting portion of the plurality of adjusting portions is spaced a second distance from the center of gravity of the rotor, the second distance being greater than the first distance, and
the one adjusting portion is recessed by a volume greater than that of the another adjusting portion.

Assignees

• Lg Magna E Powertrain Co Ltd
• Lg Electronics Inc

Inventors

• Kim Kyeonghwan
• Lee Yangsoo
• Park Gyeongjae
• Shin Hojun
• Ahn Junho
• Sung Wonjung

Classifications

• H02K7/003 Primary

  Couplings; Details of shafts (means for mounting rotors on shafts H02K1/28) · CPC title

• H02K1/22

  Rotating parts of the magnetic circuit · CPC title

• F16C3/02

  Shafts; Axles · CPC title

• H02K1/28

  Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures · CPC title

• H02K5/26

  Means for adjusting casings relative to their supports · CPC title