Hollow motor apparatuses and associated systems and methods

• US 10,554,097 B2
• Filed: 10/10/2017
• Issued: 02/04/2020
• Est. Priority Date: 03/29/2017
• Status: Active Grant

• Current Assignee: SZ DJI Technology Co., Ltd. (d/b/a DJI) (iFlight Technology Company Limited)
• Original Assignee: SZ DJI Technology Co., Ltd. (d/b/a DJI) (iFlight Technology Company Limited)
• Inventors: Huang, Huai, Zhao, Jin, Wang, Peng, Hong, Xiaoping, Zhou, Zhenhao
• Primary Examiner(s): Kenerly, Terrance L
• Application Number:
  US15/729,518
• Publication Number:
  US 20180287459A1
• Time in Patent Office: 847 Days
• CPC Class Codes: B64C 39/024 of the remote controlled vehicle type, i.e. RPV
• CPC Class Codes: B64U 20/87 Mounting of imaging devices, e.g. mounting of gimbals
• CPC Class Codes: B64U 30/20 Rotors; Rotor supports
• CPC Class Codes: B64U 50/19 using electrically powered motors
• CPC Class Codes: G02B 26/0875 by means of one or more refracting elements
• CPC Class Codes: G02B 26/0883 the refracting element being a prism
• CPC Class Codes: G02B 26/108 having one or more prisms as scanning elements
• CPC Class Codes: H02K 1/148 Sectional cores H02K1/141 takes precedence
• CPC Class Codes: H02K 1/27 Rotor cores with permanent magnets
• CPC Class Codes: H02K 1/2706 Inner rotors
• CPC Class Codes: H02K 15/165 Balancing the rotor
• CPC Class Codes: H02K 21/14 with magnets rotating within the armatures
• CPC Class Codes: H02K 21/24 with magnets axially facing the armatures, e.g. hub-type cycle dynamos
• CPC Class Codes: H02K 2201/15 Sectional machines
• CPC Class Codes: H02K 7/085 radially supporting the rotary shaft at only one end of the rotor H02K7/086, H02K7/09 take precedence
• CPC Class Codes: H02K 7/088 radially supporting the rotor directly
• CPC Class Codes: H02K 7/116 with gears
• CPC Class Codes: H02K 7/14 Structural association with mechanical loads, e.g. with hand-held machine tools or fans with fan or impeller for cooling the machine H02K9/06

Abstract

Hollow motor apparatuses and associated systems and methods for manufacturing the same are disclosed herein. In representative embodiment, a hollow motor apparatus includes a rotor assembly rotatable about a rotation axis, a stator assembly positioned adjacent to the rotor assembly and coaxially with the rotor assembly relative to the rotation axis, and a bearing assembly operably coupled to the rotor assembly. The rotor assembly has an inner portion around an opening configured to receive at least a portion of a payload. The bearing assembly is disposed outside the inner portion of the rotor assembly and is configured to maintain a position of the rotor assembly relative to the stator assembly.

Claims

1. A hollow motor apparatus, comprising:

a rotor assembly rotatable 360°

about a rotation axis, the rotor assembly having an inner portion disposed around an opening that is configured to receive at least a portion of a payload, the payload including an optical component that is rotatable, in place, with the rotor assembly, 360°

about the rotation axis,

a stator assembly positioned adjacent to the rotor assembly and coaxially with the rotor assembly relative to the rotation axis;

a bearing assembly disposed outside the inner portion of the rotor assembly and operably coupled to the rotor assembly, the bearing assembly configured to maintain a position of the rotor assembly relative to the stator assembly; and

a counterweight coupled to the rotor assembly and positioned to enable balanced rotation of the optical component with respect to the rotation axis.

2. The apparatus of claim 1, wherein the optical component comprises a lens.

3. The apparatus of claim 1, wherein the optical component comprises a prism.

4. The apparatus of claim 1, wherein the optical component is a first optical component, and wherein the apparatus further comprises a second optical component positioned to rotate about the rotation axis.

5. The apparatus of claim 4, wherein the first optical component is configured to rotate at a first rotational speed, and wherein the second optical component is configured to rotate at a second rotational speed different than the first rotational speed.

6. The apparatus of claim 1, wherein the optical component has an asymmetric shape.

7. The apparatus of claim 1, wherein the stator assembly is positioned in a first plane generally perpendicular to the rotation axis, and wherein the bearing assembly is positioned in a second plane generally perpendicular to the rotation axis, the second plane being different than the first plane.

8. The apparatus of claim 7, wherein the rotor assembly comprises a magnet yoke and at least one magnet coupled to the magnet yoke, and wherein the at least one magnet is positioned between the stator assembly and the bearing assembly, and wherein the magnet yoke comprises a first portion generally parallel to the first plane and a second portion generally perpendicular to the first plane.

9. The hollow motor apparatus of claim 1, wherein:

the payload comprises an optical component;

the optical component is coupled to the inner portion of the rotor assembly;

the rotation axis passes through a first surface and a second surface of the optical component;

the first surface and the second surface are on opposite sides of the optical component; and

the optical component has an asymmetric shape.

10. The apparatus of claim 1, wherein the optical component is configured to steer one or more light beams in different directions during rotation.

11. A hollow motor apparatus, comprising:

a rotor assembly rotatable 360°

about a rotation axis, the rotor assembly having an inner portion disposed around an opening that is configured to receive at least a portion of a payload, the payload including an optical component that is rotatable, in place, with the rotor assembly, 360°

about the rotation axis,

a stator assembly positioned adjacent to the rotor assembly and coaxially with the rotor assembly relative to the rotation axis;

a bearing assembly disposed outside the inner portion of the rotor assembly and operably coupled to the rotor assembly, the bearing assembly configured to maintain a position of the rotor assembly relative to the stator assembly; and

a counterweight coupled to the optical component and positioned to enable balanced rotation of the optical component with respect to the rotation axis.

12. The apparatus of claim 11, wherein the counterweight is positioned adjacent to a peripheral portion of the optical component.

13. A hollow motor apparatus, comprising:

a rotor assembly rotatable 360°

about a rotation axis, the rotor assembly having an inner portion disposed around an opening that is configured to receive at least a portion of a payload, the payload including an optical component that is rotatable, in place, with the rotor assembly, 360°

about the rotation axis,

a stator assembly positioned adjacent to the rotor assembly and coaxially with the rotor assembly relative to the rotation axis; and

a bearing assembly disposed outside the inner portion of the rotor assembly and operably coupled to the rotor assembly, wherein the bearing assembly is configured to maintain a position of the rotor assembly relative to the stator assembly, and wherein the bearing assembly comprises an inner portion coupled to the rotor assembly and an outer portion positioned radially external to the inner portion.

14. The apparatus of claim 13, wherein a magnetic force between the stator assembly and the rotor assembly moves the inner portion, along a direction generally parallel to the rotation axis.

15. The apparatus of claim 14, wherein the bearing assembly further comprises one or more rolling components rotatably positioned between the inner portion and the outer portion, and wherein, when the inner portion moves axially relative to the outer portion to reduce an axial clearance of the one or more rolling components.

16. The apparatus of claim 15, wherein the rotor assembly comprises a magnet, and wherein, when an electrical current flows in the stator assembly, a first edge of the magnet is positioned substantially flush with a second edge of the stator assembly.

17. The apparatus of claim 15, wherein the rotor assembly comprises a magnet, and wherein, when no electrical current flows in the stator assembly, a first edge of the magnet is not positioned flush with a second edge of the stator assembly.

18. The apparatus of claim 15, wherein the rotor assembly comprises a magnet, and wherein a gap exists between the magnet and stator assembly.

19. The apparatus of claim 18, wherein, when an electrical current flows in the stator assembly, the magnet moves toward the stator assembly and a size of the gap is decreased.

20. The apparatus of claim 18, wherein, when an electrical current flows in the stator assembly, the magnet moves toward the stator assembly and a size of the gap is decreased.

21. The apparatus of claim 15, wherein the rotor assembly comprises a magnet, and wherein, when an electrical current flows in the stator assembly, a first edge of the magnet is positioned substantially flush with a second edge of the stator assembly.

22. The apparatus of claim 14, wherein the bearing assembly further comprises one or more rolling components rotatably positioned between the inner portion and the outer portion, and wherein, when the inner portion moves axially relative to the outer portion to reduce an axial clearance of the one or more rolling components.

23. The apparatus of claim 15, wherein the rotor assembly comprises a magnet, and wherein, when no electrical current flows in the stator assembly, a first edge of the magnet is not positioned flush with a second edge of the stator assembly.

24. The apparatus of claim 15, wherein the rotor assembly comprises a magnet, and wherein a gap exists between the magnet and stator assembly.

25. A hollow motor apparatus for an unmanned aerial vehicle (UAV), the apparatus comprising:

a propeller, wherein the propeller comprises

a light entrance portion configured to receive a light ray from a light source coupled to the UAV;

a light exit portion configured to direct the light ray away from the propeller; and

a light transmission portion connecting the light entrance portion and the light exit portion and configured to transmit the light ray from the light entrance portion toward the light exit portion;

a rotor assembly rotatable 360°

about a rotation axis and coupled to the propeller, the rotor assembly having an inner portion disposed around an opening that is configured to receive at least a portion of a payload, the payload including an optical component that is rotatable, in place, with the rotor assembly, 360°

about the rotation axis;

a stator assembly positioned adjacent to the rotor assembly and coaxially with the rotor assembly relative to the rotation axis; and

a bearing assembly disposed outside the inner portion of the rotor assembly and operably coupled to the rotor assembly, the bearing assembly configured to maintain a position of the rotor assembly relative to the stator assembly.

26. A hollow motor apparatus, comprising:

a rotor assembly rotatable about a rotation axis, the rotor assembly having an inner portion disposed around an opening that is configured to receive at least a portion of a payload;

a stator assembly positioned adjacent to the rotor assembly and coaxially with the rotor assembly relative to the rotation axis; and

a bearing assembly disposed outside the inner portion of the rotor assembly and operably coupled to the rotor assembly, the bearing assembly configured to maintain a position of the rotor assembly relative to the stator assembly, wherein the bearing assembly comprises an inner portion coupled to the rotor assembly and an outer portion positioned radially external to the inner portion, and wherein a magnetic force between the stator assembly and the rotor assembly moves the inner portion, along a direction generally parallel to the rotation axis.

27. The apparatus of claim 26, wherein at least one of the rotor assembly and the optical component is shaped such that the rotor assembly and the optical component are rotatable in a balanced manner with respect to the rotation axis.

28. A hollow motor apparatus for an unmanned aerial vehicle (UAV), the apparatus comprising:

a propeller having;

a light entrance portion configured to receive a light ray from a light source coupled to the UAV;

a light exit portion configured to direct the light ray away from the propeller; and

a light transmission portion connecting the light entrance portion and the light exit portion and configured to transmit the light ray from the light entrance portion toward the light exit portion; and

a rotor assembly rotatable about a rotation axis and coupled to the propeller, the rotor assembly having an inner portion disposed around an opening that is configured to receive at least a portion of a payload;

a stator assembly positioned adjacent to the rotor assembly and coaxially with the rotor assembly relative to the rotation axis; and

a bearing assembly disposed outside the inner portion of the rotor assembly and operably coupled to the rotor assembly, the bearing assembly configured to maintain a position of the rotor assembly relative to the stator assembly.