HOUSING FOR AN ELECTRICAL STARTER MOTOR

• US 20130270828A1
• Filed: 04/13/2012
• Published: 10/17/2013
• Est. Priority Date: 04/13/2012
• Status: Abandoned Application

• Current Assignee: Hamilton Sundstrand Corporation (Raytheon Technologies Corporation d/b/a RTX)
• Original Assignee: Hamilton Sundstrand Corporation (Raytheon Technologies Corporation d/b/a RTX)
• Inventors: Legros, Craig R.
• Application Number:
  US13/446,881
• Publication Number:
  US 20130270828A1
• Time in Patent Office: Days
• US Class Current: 290/48
• CPC Class Codes: F02N 15/00 Other power-operated starting apparatus; Component parts, details, or accessories, not provided for in, or of interest apart from groups F02N5/00 - F02N13/00
• CPC Class Codes: F02N 7/12 the engines being of rotary type, e.g. turbines F02N7/14 takes precedence
• CPC Class Codes: H02K 1/185 to outer stators
• CPC Class Codes: H02K 5/06 Cast metal casings

Abstract

A housing for an electrical device includes an interior surface and one or more stress reducing notches. The interior surface is configured to interface with one or more internal components of the motor. The one or more stress reducing notches are located along the interior surface of the housing.

Claims

1. A housing for an electrical device comprising:

an interior surface configured to interface with one or more internal components of the motor; and

one or more stress reducing notches located along the interior surface of the housing.

2. The housing of claim 1, further comprising:

one or more stator laminations disposed within the housing and interfacing with at least a portion of the interior surface, wherein each of the notches create an air gap between the housing and the stator laminations.

3. The housing of claim 2, wherein the stator laminations comprise a continuous hoop design that provides for an uninterrupted outer surface designed to interface with the interior surface of the housing.

4. The housing of claim 2, wherein the notches are located along the interior surface at one or more circumferential locations in order to reduce contact stress between the housing and stator laminations which results from the housing and stator laminations having different thermal coefficients of expansion.

5. The housing of claim 2, wherein the notches extend axially along the interior surface so as to interface with a plurality of the stator laminations.

6. The housing of claim 1, wherein the notches are symmetrically circumferentially spaced along the interior surface.

7. The housing of claim 1, wherein the motor comprises a starter motor for a gas turbine engine.

8. The housing of claim 1, wherein the notches have a scallop shape with fillets having substantially equal radii.

10. The motor of claim 8, wherein the notches are located along the interior surface at one or more circumferential locations in order to reduce contact stress between the housing and stator laminations which results from the housing and stator laminations having different thermal coefficients of expansion.

20. The assembly of claim 2, wherein the stator laminations comprise a continuous hoop design that provides for an uninterrupted outer surface design to interface with the interior surface of the housing.

9. A motor comprising:

a housing having one or more stress reducing notches therein located along an interior surface of the housing; and

a one or more of stator laminations disposed within the housing and interfacing with at least a portion of the interior surface, wherein each of the notches creates an air gap between the housing and the stator laminations.

11. The motor of claim 9, wherein the stator laminations comprise a continuous hoop design that provides for an uninterrupted outer surface design to interface with the interior surface of the housing.

12. The motor of claim 9, wherein the notches extend axially along the interior surface so as to interface with the stator laminations.

13. The motor of claim 9, wherein the notches are symmetrically circumferentially spaced along the interior surface.

14. The motor of claim 9, wherein the motor comprises a starter motor for a gas turbine engine.

15. The housing of claim 9, wherein the notches have a scallop shape with fillets having substantially equal radii.

17. The assembly of claim 14, wherein the notches extend axially along the interior surface so as to interface with the stator laminations.

18. The assembly of claim 14, wherein the notches are symmetrically circumferentially spaced along the interior surface.

19. The assembly of claim 14, wherein the notches are located along the interior surface at one or more circumferential locations in order to reduce contact stress between the housing and stator laminations which results from the housing and stator laminations having different thermal coefficients of expansion.

16. An assembly for a gas turbine engine comprising:

an accessory gearbox; and

a starter motor mounted to the accessory gearbox, wherein the starter motor includes a housing having one or more stress reducing notches therein located along an interior surface of the housing, and wherein the starter motor has a plurality of stator laminations disposed within the housing and interfacing with at least a portion of the interior surface.