Electric motor fan cover, end bell interface, and radially mounted brush holder

Patent metadata

Field	Value
Publication number	US-12294253-B2
Application number	US-202217987128-A
Country	US
Kind code	B2
Filing date	Nov 15, 2022
Priority date	Nov 15, 2022
Publication date	May 6, 2025
Grant date	May 6, 2025

Abstract

A system for mitigating induced currents in an electric motor having a shaft includes: a brush holder having a handle end, the brush holder having: a brush holder handle at the handle end; and a shaft grounding brush attached to the brush holder handle, the shaft grounding brush including a contact at a contact end of the brush holder, the contact end being opposite the handle end; and an end bell of the electric motor, the end bell receiving the contact end of the brush holder such that the contact of the shaft grounding brush contacts the shaft.

First claim

What is claimed is:

1. A system for mitigating induced currents in an electric motor having a shaft, the system comprising:
a brush holder having a handle end, the brush holder comprising:
a brush holder handle at the handle end;
a shaft grounding brush attached to the brush holder handle, the shaft grounding brush including a contact at a contact end of the brush holder, the contact end being opposite the handle end;
a brush holder extension attached to the brush holder handle, the brush holder extension extending between the handle end and the contact end, wherein the shaft grounding brush is disposed at least partially within the brush holder extension, and wherein the shaft grounding brush is removable from the brush holder handle by pulling the brush holder extension through the brush holder handle; and

an end bell of the electric motor, the end bell being configured to receive the contact end of the brush holder such that the contact of the shaft grounding brush is configured to contact the shaft.

2. The system of claim 1 , wherein the brush holder comprises threads configured to engage the end bell so as to affix the brush holder to the electric motor.

3. The system of claim 1 , further comprising:
a fan cover of the electric motor, the fan cover including a fan cover through hole configured to receive the brush holder,
wherein the brush holder comprises threads configured to engage the fan cover so as to affix the brush holder to the electric motor.

4. The system of claim 1 , wherein the brush holder extension comprises threads configured to engage the end bell so as to affix the brush holder to the electric motor.

5. The system of claim 1 , wherein the contact of the shaft grounding brush extends beyond the brush holder extension at the contact end of the shaft grounding brush.

6. The system of claim 1 , wherein the brush holder includes at least one detent, and
wherein the shaft grounding brush comprises a spring, the spring being disposed between the at least one detent and the brush holder handle.

7. The system of claim 1 , wherein the brush holder handle includes one of a proprietary interface or a standard interface so as to enable rotation of the brush holder with respect to the electric motor.

8. The system of claim 1 , wherein the shaft grounding brush comprises a stem with a tab attached thereto at the handle end of the shaft grounding brush,
wherein the brush holder handle comprises a tab rest, and
wherein the tab is accommodated in the tab rest when the shaft grounding brush is attached to the brush holder.

9. A brush holder for a shaft grounding brush for an electric motor, comprising:
a brush holder handle disposed at a handle end of the brush holder;
a shaft grounding brush attached to the brush holder handle, the shaft grounding brush comprising a stem and a contact attached to the stem, the contact being disposed at a contact end of the brush holder, the contact end being opposite the handle end; and
a brush holder extension attached to the brush holder handle, the brush holder extension extending between the handle end and the contact end, wherein the shaft grounding brush is disposed at least partially within the brush holder extension, and wherein the shaft grounding brush is removable from the brush holder handle by pulling the brush holder extension through the brush holder handle.

10. The brush holder of claim 9 , further comprising:
threads disposed at the handle end.

11. The brush holder of claim 9 , further comprising:
at least one detent,
wherein the shaft grounding brush comprises a spring, the spring being disposed between the at least one detent and the brush holder handle and extending between the contact end and the handle end.

12. The brush holder of claim 9 , wherein the brush holder handle includes one of a proprietary interface or a standard interface so as to enable rotation of the brush holder by a user.

13. The brush holder of claim 9 , wherein the stem comprises a tab at the handle end of the shaft grounding brush, wherein the brush holder handle comprises a tab rest, and wherein the tab is accommodated in the tab rest when the shaft grounding brush is attached to the brush holder.

14. The brush holder of claim 9 , wherein the brush holder extension comprises threads.

15. The brush holder of claim 9 , wherein the contact of the shaft grounding brush extends beyond the brush holder extension at the contact end.

16. An electric motor, comprising:
a shaft rotatably mounted inside the electric motor;
a brush holder comprising a brush holder handle, a shaft grounding brush having a contact, and a brush holder extension attached to the brush holder handle, the brush holder having a handle end and a contact end opposite the handle end, the contact being disposed at the contact end, the shaft grounding brush being attached to the brush holder handle, the brush holder extension extending between the handle end and the contact end, wherein the shaft grounding brush is disposed at least partially within the brush holder extension, and wherein the shaft grounding brush is removable from the brush holder handle by pulling the brush holder extension through the brush holder handle; and
an end bell disposed circumferentially around the shaft, the end bell being configured to receive the contact end of the brush holder such that the contact of the shaft grounding brush contacts the shaft.

17. The electric motor of claim 16 , wherein the brush holder comprises threads configured to affix the brush holder to the end bell.

18. The electric motor of claim 16 , wherein the brush holder is arranged at least one of transversely or perpendicularly with respect to the shaft.

Assignees

• Abb Schweiz Ag

Inventors

• Mask Iii Robert J
• Sharum Mark J
• Christiansen Bevan J

Classifications

• H01R39/38

  Brush holders · CPC title

• F16C41/002

  Conductive elements, e.g. to prevent static electricity · CPC title

• H01R39/12

  using bearing or shaft surface as contact surface · CPC title

• H02K9/06

  with fans or impellers driven by the machine shaft · CPC title

• H02K5/148

  Slidably supported brushes · CPC title