Integrated motor and controller assemblies for horizontal axis washing machines

• US 20070063603A1
• Filed: 11/17/2006
• Published: 03/22/2007
• Est. Priority Date: 08/22/2005
• Status: Abandoned Application

• Current Assignee: Emerson Electric Company
• Original Assignee: Emerson Electric Company
• Inventors: Hilton, Daniel, Major, Michael, Burton, Stephen, Levine, Gregory, Schroer, Scott, Stultz, Peter
• Application Number:
  US11/601,060
• Publication Number:
  US 20070063603A1
• Time in Patent Office: Days
• US Class Current: 310/85
• CPC Class Codes: D06F 37/206 Mounting of motor
• CPC Class Codes: D06F 37/304 Arrangements or adaptations of electric motors
• CPC Class Codes: H02K 11/33 Drive circuits, e.g. power electronics H02K11/38 takes precedence
• CPC Class Codes: Y02B 40/00 Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Abstract

A front loading washing machine includes an integrated motor and controller assembly. In various embodiment, the controller is mounted directly to one of a pair of opposing endshields of the electric motor and the endshields are mounted directly to a stator of the motor. Additional embodiments include a rotor shaft of the motor having each of opposing ends supported within a bearing mounted within a respective one of the opposing endshields. In other embodiments, the controller can include an insulating shield positioned between a controller circuit board and the motor endshield to which the controller is mounted. The insulating shield providing electrical arcing protection, thermal insulation and/or electromagnetic insulation between the circuit board and the endshield.

Claims

1. An electric motor and controller assembly for a horizontal axis washing machine, the assembly comprising an electric motor and a controller mounted to an endshield of the motor, the controller including a circuit board and software for controlling operation of the electric motor in the horizontal axis washing machine, and an insulating shield positioned between the controller circuit board and the motor endshield.

2. The assembly of claim 1, wherein the insulating shield comprises an electrical arcing insulating shield.

3. The assembly of claim 1, wherein the insulating shield comprises a thermal insulating shield.

4. The assembly of claim 1, wherein the insulating shield comprises an electromagnetic interference insulating shield.

5. The assembly of claim 1, wherein the insulating shield includes an insulative layer comprising potting compound.

6. The assembly of claim 1, wherein the insulating shield includes an insulative layer comprising one of an insulative fabric and a conformal coating.

7. The assembly of claim 1, wherein the insulating shield comprises a plurality of stand-off bosses to provide a pre-determined amount of physical separation between controller circuit board and the motor endshield to which the controller is mounted.

8. The assembly of claim 1, wherein the motor comprises a stator to which the endshield is directly mounted and the controller is mounted directly to the endshield.

9. The assembly of claim 1, wherein the motor includes a pair of endshields mounted to opposing ends of the stator, each endshield supporting a bearing, each bearing supporting an opposing end of a rotor shaft.

10. The assembly of claim 1, wherein the endshield is structured to include at least one heat venting passage to provide heat dissipation during operation of the motor.

11. The assembly of claim 1, wherein the assembly comprises:

a pair of opposing endshields, at least one of the endshields mounted directly to a stator of the motor and having the motor controller mounted directly thereto, each endshield structured to include at least one heat venting passage to provide heat dissipation during operation of the motor; and

a rotor mounted on a rotor shaft having each of opposing ends supported within a bearing mounted within a respective one of the opposing endshields for allowing rotation of the stator within an interior space of the stator; and

wherein the controller insulating shield is positioned between the controller circuit board and the motor endshield to which the controller is mounted.

12. The assembly of claim 1, wherein the endshield comprises a controller receiving wall extending from the endshield, the controller receiving wall forming a reservoir into which the controller is seated.

13. The assembly of claim 1, wherein the circuit board comprises a first portion substantially orthogonally oriented with a second portion of the circuit board.

14. The assembly of claim 13, wherein the insulating shield includes a hood portion substantially covering the second portion of the circuit board.

15. The assembly of claim 1, wherein the controller is a modular controller subassembly integrally mounted to the endshield such that forces applied to the modular controller subassembly are transferred directly to the endshield.

16. The assembly of claim 15, wherein the modular controller subassembly is integrally mounted to the endshield utilizing a plurality of screws, at least one of which electrically grounds the circuit board to the endshield.

17. An electric motor and controller assembly for a horizontal axis washing machine, the assembly comprising an electric motor and a modular controller subassembly including a circuit board and software for controlling operation of the electric motor in the horizontal axis washing machine, the modular controller subassembly integrally mounted to an endshield of the electric motor and the endshield mounted directly to a stator of the motor.

18. The assembly of claim 17, wherein the modular controller subassembly is mounted directly to the endshield such that forces applied to the modular controller subassembly are transferred directly to the endshield.

19. The assembly of claim 17, wherein the modular controller subassembly comprises a heat sink formed and utilized as a portion of a housing of the modular controller subassembly.

20. The assembly of claim 17, wherein the modular controller subassembly comprises an insulating shield formed and utilized as a portion of a housing of the modular controller subassembly, the insulation shield comprising at least one of an electrical arcing insulating shield, a thermal insulating shield, and an electromagnetic interference insulating shield positioned between the controller circuit board and the motor endshield to which the controller is mounted.

21. The assembly of claim 17, wherein the motor includes a pair of endshields mounted to opposing ends of the stator, each endshield supporting a bearing, each bearing supporting an opposing end of a rotor shaft.

22. The assembly of claim 17, wherein the endshield is structured to include at least one heat venting passage to provide heat dissipation during operation of the motor.

23. The assembly of claim 17, wherein the endshield comprises a controller receiving wall extending from the endshield, the controller receiving wall forming a reservoir into which the modular controller subassembly is seated.

24. An electric motor and controller assembly for a horizontal axis washing machine, the assembly comprising an electric motor and a modular controller subassembly integrally mounted to one of a pair of opposing endshields of the motor, each endshield supporting a bearing, each bearing supporting an opposing end of a rotor shaft.

25. The assembly of claim 24, wherein the motor comprises a stator to which each of the endshields is directly mounted and the modular controller subassembly is mounted directly to one of the endshields.

26. The assembly of claim 24, wherein the modular controller subassembly comprises a circuit board, a heat sink formed and utilized as a portion of a housing of the modular controller subassembly, and an insulating shield formed and utilized as a portion of the housing of the modular controller subassembly, the insulating shield comprising and at least one of an electrical arcing insulating shield, a thermal insulating shield, and an electromagnetic interference insulating shield positioned between the controller circuit board and the motor endshield to which the controller is mounted.

27. The assembly of claim 24, wherein each endshield is structured to include at least one heat venting passage to provide heat dissipation during operation of the motor.

28. The assembly of claim 24, wherein the endshield to which the modular controller subassembly is integrally mounted includes a controller receiving wall extending from the endshield, the controller receiving wall forming a reservoir into which the modular controller subassembly is mounted.

29. A horizontal axis washing machine, said horizontal washing maching comprising:

a tub;

an electric motor including;

a pair of opposing endshields mounted directly to a stator of the motor; and

a rotor mounted on a rotor shaft having each of opposing ends supported within a bearing mounted within a respective one of the opposing endshields for allowing rotation of the stator within an interior space of the stator; and

a motor controller mounted directly to one of the opposing motor endshields, the controller including;

a circuit board and software for controlling operation of the electric motor in the horizontal axis washing machine; and

an insulating shield positioned between the circuit board and the motor endshield to which the controller is mounted.

30. The horizontal axis washing machine of claim 29, wherein each endshield is structured to include at least one heat venting passage to provide heat dissipation during operation of the motor.

31. The horizontal axis washing machine of claim 29, wherein the controller is a modular subassembly comprising the circuit board, the insulating shield formed and utilized as a portion of a housing of the modular controller subassembly and a heat sink formed and utilized as a portion of the modular controller subassembly housing.

32. The horizontal axis washing machine of claim 29, wherein the controller is directly mounted to the endshield utilizing a plurality of screws, at least one of which electrically grounds the circuit board to the endshield.

33. The horizontal axis washing machine of claim 29, wherein the insulating shield comprises at least one of an electrical arcing insulating shield, a thermal insulating shield, and an electromagnetic interference insulating shield.

34. The horizontal axis washing machine of claim 29, wherein the endshield to which the controller is mounted includes a controller receiving wall extending from the endshield, the controller receiving wall forming a reservoir into which the controller is mounted.

35. The horizontal axis washing machine of claim 29, wherein the insulating shield includes an insulative layer comprising at least one of a layer of potting compound, a layer of conformal coating and a layer of insulative fabric.

36. The horizontal axis washing machine of claim 29, wherein the insulating shield comprises a plurality of stand-off bosses to provide a pre-determined amount of physical separation between controller circuit board and the motor endshield to which the controller is mounted.