Winding assemblies for electrical machines

• US 6,774,530 B2
• Filed: 06/07/2002
• Issued: 08/10/2004
• Est. Priority Date: 06/07/2002
• Status: Expired due to Fees

• Current Assignee: Briggs & Stratton Corporation
• Original Assignee: Briggs & Stratton Corporation
• Inventors: Fiorenza, John A., Rose, Dave M., Cukjati, Deborah E., Vetta, Tim J., Belkin, Felix
• Primary Examiner(s): MULLINS, BURTON S
• Application Number:
  US10/165,111
• Publication Number:
  US 20030227229A1
• Time in Patent Office: 795 Days
• Field of Search: 310/179-180, 310/184, 310/195, 310/203, 310/207, 310/208, 310/254, 310/261, 310/268, 310/42
• US Class Current: 310/268
• CPC Class Codes: H02K 2203/09 Machines characterised by wiring elements other than wires, e.g. bus rings, for connecting the winding terminations
• CPC Class Codes: H02K 3/47 Air-gap windings, i.e. iron-free windings
• CPC Class Codes: H02K 3/50 Fastening of winding heads, equalising connectors, or connections thereto

Abstract

Winding assemblies of electrical machines, such as electric motors, are provided which include a connector scheme having at least one conduit that is electrically coupled via a wave soldered connection directly to at least two windings which are not axially adjacent. The conduit can include a common connector and/or a phase connector. The connector scheme can additionally or alternatively include a power connector that is electrically coupled via wave soldering directly to a single winding, and adapted to be electrically coupled to a power source. The winding assemblies of the invention can additionally provide a number of constructions which allow for minimally sized air gaps.

Claims

1. A winding assembly for an electrical machine having an axis, the winding assembly having an inner region situated radially outward of the axis and an outer region situated radially outward of the inner region, the winding assembly comprising:

a first winding having a first portion situated in the outer region;

a second winding having a second portion situated in the outer region;

a third winding having a third portion situated in the outer region; and

a conduit electrically coupled directly to the first and third portions via at least one wave soldered connection, wherein

the first and third portions form an acute angle with respect to the axis, and

the second portion is situated in the acute angle.

2. The winding assembly of claim 1, wherein the electrical machine includes an electric motor.

3. The winding assembly of claim 2, wherein the electric motor is a brushless DC, axial air gap, three phase electric motor.

13. The winding assembly of claim 1, wherein the conduit includes a rigid conduit.

14. The winding assembly of claim 1, wherein the electrical machine has at least a first phase, and wherein the winding assembly further comprises:

a fourth winding having a fourth portion situated in the outer region, the first phase including the first and fourth windings; and

a power connector having an outer portion situated in the outer region and an inner portion situated in the inner region, wherein the outer portion of the power connector is electrically coupled directly to the fourth portion via a wave soldered connection, and wherein the inner portion is adapted to be electrically coupled to a power source associated with the electrical machine.

15. The winding assembly of claim 1, wherein the winding assembly forms an air gap with a magnetically-coupled element, and wherein the winding assembly has a recess extending to the periphery of the winding assembly in a side facing the air gap, the recess receiving at least a portion of the conduit.

16. The winding assembly of claim 1, further comprising a magnetically permeable element situated between the first and second windings, wherein the first and second windings define a plane, and wherein at least a portion of the magnetically permeable element extends through the plane in a direction toward a magnetically-coupled element.

86. The winding assembly of claim 1, wherein the second portion is completely situated in the acute angle.

87. The winding assembly of claim 1, wherein the first, second, and third portions are situated in first, second, and third substantially radial planes, respectively.

4. A winding assembly for an electrical machine having an axis, the winding assembly having an inner region situated radially outward of the axis and an outer region situated radially outward of the inner region, the winding assembly comprising:

a first winding having a first portion situated in the outer region;

a second winding having a second portion situated in the outer region;

a third winding having a third portion situated in the outer region; and

a conduit electrically coupled directly to the first and third portions via at least one wave soldered connection, wherein

the first and third portions form an acute angle with respect to the axis,

the second portion is situated in the acute angle, and

wherein the conduit includes a main portion, and first and second connector portions, wherein the first and second connector portions are coupled directly to the first and third portions, respectively, via at least one wave soldered connection, and wherein the main portion couples the first and second connector portions.

5. The winding assembly of claim 4, wherein the first and second connector portions are integral with the main portion.

6. The winding assembly of claim 4, wherein the first and second connector portions are removably coupled to the main portion.

7. The winding assembly of claim 4, wherein the first and second connector portions are permanently coupled to the main portion.

8. The winding assembly of claim 7, wherein the first and second connector portions are permanently coupled to the main portion via at least one of a solder connection and a weld.

9. The winding assembly of claim 4, wherein the conduit further includes a third connector portion, wherein the third connector portion is coupled directly to the third portion via a wave soldered connection.

10. The winding assembly of claim 4, wherein the electrical machine includes at least first and second phases, and wherein the first portion includes a common portion of the first phase and the third portion includes a common portion of the second phase.

11. The winding assembly of claim 4, wherein the electrical machine has at least a first phase, and wherein the first portion includes a portion of a negative half phase of the first phase and the second portion includes a portion of a positive half phase of the first phase.

12. The winding assembly of claim 4, wherein the first and second connector portions are situated in the outer region, and wherein a majority of the main portion is situated in the inner region.

84. The winding assembly of claim 4, wherein the electrical machine includes an electric motor.

85. The winding assembly of claim 4, wherein the electric motor is a brushless DC, axial air gap, three phase electric motor.

17. A winding assembly for an electrical machine having an axis and at least first and second phases, the winding assembly having an inner region situated radially outward of the axis and an outer region situated radially outward of the inner region, the winding assembly comprising:

first and second windings defining in part the first phase, at least a portion of the second winding being adjacent to at least a portion of the first winding;

a connector electrically coupled directly to the first and second windings via a wave soldered connection;

a third winding defining in part the second phase; and

a rigid conduit electrically coupled directly to the first and third windings, a majority of the rigid conduit being situated in the inner region.

18. The winding assembly of claim 17, wherein the electrical machine includes an axial air gap, three phase electric motor.

19. The winding assembly of claim 17, wherein the first winding includes a common portion of the first phase and the third winding includes a common portion of the second phase.

20. The winding assembly of claim 17, wherein the rigid conduit includes a main portion and first and second connector portions, wherein the first and second connector portions are electrically coupled directly to the first and third windings, respectively, and wherein the main portion couples the first and second connector portions.

21. The winding assembly of claim 20, wherein the first and second connector portions are electrically coupled directly to the first and third windings, respectively, via at least one wave soldered connection.

22. The winding assembly of claim 20, wherein the first and second connector portions are integral with the main potion.

23. The winding assembly of claim 20, wherein the first and second connector portions are removably coupled to the main portion.

24. The winding assembly of claim 20, wherein the first and second connector portions are permanently coupled to the main portion.

25. The winding assembly of claim 24, wherein the first and second connector portions are permanently coupled to the main portion via at least one of a solder connection and a weld.

26. The winding assembly of claim 17, wherein the electrical machine having at least first, second, and third phases, wherein the winding assembly further comprises a fourth winding defining in part the third phase, wherein the rigid conduit includes a main portion and first, second, and third connector portions, wherein the first, second, and third connector portions are electrically coupled directly to the first, second, and third windings, respectively, and wherein the main portion electrically couples the first, second, and third connector portions.

27. The winding assembly of claim 26, wherein the first, second, and third connector portions are electrically coupled directly to the first, second, and third windings, respectively, via at least one wave soldered connection.

28. The winding assembly of claim 17, wherein the winding assembly forms an air gap with a magnetically-coupled element, and wherein the winding assembly has a recess extending to the periphery of the winding assembly in a side facing the air gap, the recess receiving at least a portion of the conduit.

29. The winding assembly of claim 17, further comprising a magnetically permeable element situated between the first and second windings, wherein the first and second windings define a plane, and wherein at least a portion of the magnetically permeable element extends through the plane in a direction toward a magnetically-coupled element.

30. The winding assembly of claim 17, wherein the winding assembly forms an air gap with a magnetically-coupled element, and wherein the winding assembly has a recess radially inward of the periphery of the winding assembly in a side facing the air gap, the recess receiving at least a portion of the conduit.

31. The winding assembly of claim 17, wherein the rigid conduit is electrically coupled directly to the first and third windings via at least one wave soldered connection.

32. A winding assembly for an electrical machine having an axis and at least a first phase, the winding assembly having an inner region situated radially outward of the axis and an outer region situated radially outward of the inner region, the winding assembly comprising:

a first plurality of windings electrically coupled via at least one wave soldered connection in the outer region to form a first portion of the first phase, the first portion having a first IN terminal and a first OUT terminal;

a second plurality of windings electrically coupled via at least one wave soldered connection in the outer region to form a second portion of the first phase, the second portion having a second IN terminal and a second OUT terminal; and

a rigid conduit electrically coupled directly to the first OUT terminal and the second IN terminal, wherein

the first OUT terminal and the second IN terminal form an acute angle with respect to the axis, and

the second OUT terminal is situated in the acute angle.

33. The winding assembly of claim 32, wherein the first portion includes a negative half phase of the first phase and the second portion includes a positive half phase of the first phase.

34. The winding assembly of claim 32, wherein the electrical machine has at least first and second phases, and wherein the winding assembly further comprises:

a third plurality of windings electrically coupled via at least one wave soldered connection in the outer region to form a third portion of the second phase, the third portion having a third IN terminal and a third OUT terminal;

a fourth plurality of windings electrically coupled via at least one wave soldered connection in the outer region to form a fourth portion of the second phase, the fourth portion having a fourth IN terminal and a fourth OUT terminal; and

a second rigid conduit electrically coupled directly to the third OUT terminal and the fourth IN terminal, wherein

the third OUT terminal and the fourth IN terminal form an acute angle with respect to the axis, and

the fourth OUT terminal is situated in the acute angle.

35. The winding assembly of claim 34, wherein the second rigid conduit is electrically coupled directly to the third OUT terminal and the fourth IN terminal via at least one wave soldered connection.

36. The winding assembly of claim 34, wherein the third portion includes a negative half phase of the second phase and the fourth portion includes a positive half phase of the second phase.

37. The winding assembly of claim 32, wherein the rigid conduit includes a main portion and first and second connector portions, wherein the first and second connector portions are coupled directly to the first OUT terminal and the second IN terminal, respectively, and wherein the main portion couples the first and second connector portions.

38. The winding assembly of claim 37, wherein the first and second connector portions are coupled directly to the first OUT terminal and the second IN terminal, respectively, via at least one wave soldered connection.

39. The winding assembly of claim 37, wherein the first and second connector portions are integral with the main portion.

40. The winding assembly of claim 37, wherein the first and second connector portions are removably coupled to the main portion.

41. The winding assembly of claim 37, wherein the first and second connector portions are permanently coupled to the main portion.

42. The winding assembly of claim 37, wherein the first and second connector portions are permanently coupled to the main portion via at least one of a solder connection and a weld.

43. The winding assembly of claim 32, wherein the winding assembly forms an air gap with a magnetically-coupled element, and wherein the winding assembly has a recess extending to the periphery of the winding assembly in a side facing the air gap, the recess receiving at least a portion of the conduit.

44. The winding assembly of claim 32, further comprising a magnetically permeable element situated between a first winding of the first plurality of windings and a second winding of the second plurality of windings, wherein the first and second windings define a plane, and wherein at least a portion of the magnetically permeable element extends through the plane in a direction toward a magnetically-coupled element.

45. The winding assembly of claim 32, wherein the winding assembly forms an air gap with a magnetically-coupled element, and wherein the winding assembly having a recess radially inward of the periphery of the winding assembly in a side facing the air gap, the recess receiving at least a portion of the conduit.

46. The winding assembly of claim 32, wherein the rigid conduit is electrically coupled directly to the first OUT terminal and the second IN terminal via at least one wave soldered connection.

47. A winding assembly for an electrical machine having an axis and at least a first phase, the winding assembly having an inner region situated radially outward of the axis and an outer region situated radially outward of the inner region, the winding assembly comprising:

a winding defining in part the first phase, the winding having an outer portion situated in the outer region;

a connector having an outer portion situated in the outer region and an inner portion situated in the inner region, the outer portion of the connector being electrically coupled directly to the outer portion of the winding via a wave soldered connection, and the inner portion being adapted to electrically couple the first phase to a power source associated with the electrical machine.

48. The winding assembly of claim 47, wherein the inner portion is integral with the outer portion.

49. The winding assembly of claim 47, wherein the inner portion is removably coupled to the outer portion.

50. The winding assembly of claim 47, wherein the inner portion is permanently coupled to the outer portion.

51. The winding assembly of claim 50, wherein the inner portion is permanently coupled to the outer portion via one of a solder connection and a weld.

52. The winding assembly of claim 47, wherein the inner portion is adapted to electrically couple the first phase to the power source via a conduit.

53. The winding assembly of claim 52, wherein the inner portion is integral with the conduit.

54. The winding assembly of claim 52, wherein the inner portion is removably coupled to the conduit.

55. The winding assembly of claim 52, wherein the conduit includes a bolt member and a wire, wherein the inner portion is removably coupled to the bolt member, and wherein the bolt member is electrically coupled to the wire member.

56. The winding assembly of claim 52, wherein the inner portion is permanently coupled to the conduit.

57. The winding assembly of claim 47, wherein the electrical machine has at least first and second phases, and wherein the winding assembly further comprises:

a second winding defining in part the second phase, the second winding having a second outer portion situated in the outer region; and

a second connector having a second outer portion situated in the outer region and a second inner portion situated in the inner region, wherein the second outer portion of the second power connector is electrically coupled directly to the second outer portion of the second winding via a wave soldered connection, and wherein the second inner portion is adapted to be electrically coupled to the power source.

58. The winding assembly of claim 47, wherein the electrical machine includes an electric motor.

59. A winding assembly for an axial air gap electrical machine having an axis, a rotor adapted to rotate about the axis, a stator, and an air gap between the rotor and the stator, the winding assembly having a first side adjacent to the air gap, a second side opposite the first side, an inner region situated radially outward of the axis, a middle region situated radially outward of the inner region, and an outer region situated radially outward of the middle region, the winding assembly comprising:

a first winding having a first edge adjacent to the air gap, the first edge having a first notch;

a second winding having a second edge adjacent to the air gap, the second edge having a second notch; and

a conduit electrically coupled directly to the first and second windings via at least one wave soldered connection in the outer region, wherein a majority of the conduit is situated in a recess at least partially defined by the first notch and the second notch, and wherein the recess extends to the periphery of the winding assembly.

60. The winding assembly of claim 59, wherein the recess is circumferentially extending.

61. The winding assembly of claim 60, wherein the recess extends around an entire circumference of the winding assembly.

62. The winding assembly of claim 59, wherein the recess is located radially outward of the inner region in the middle region and the outer region.

63. The winding assembly of claim 59, wherein the conduit includes a height defined in the axial direction and a width defined in the radial direction, and wherein the recess is sized to accommodate the height and the width of the conduit, respectively.

64. The winding assembly of claim 63, wherein the recess includes a height defined in the axial direction and a width defined in the radial direction, wherein the height and the width of the recess are substantially similar to the height and the width of the conduit, respectively.

65. The winding assembly of claim 59, wherein the conduit includes a rigid conduit.

66. The winding assembly of claim 59, wherein the conduit includes a main portion and first and second connector portions, wherein the first and second connector portions are electrically coupled directly to the first and second windings, respectively, via at least one wave soldered connection.

67. The winding assembly of claim 59, wherein the electrical machine includes an electric motor.

68. A winding assembly for an axial air gap electrical machine having an axis, a rotor adapted to rotate about the axis, a stator, and an air gap between the rotor and the stator, the winding assembly having a first side adjacent to the air gap, a second side opposite the first side, an inner region situated radially outward of the axis, a middle region situated radially outward of the inner region, and an outer region situated radially outward of the middle region, the winding assembly comprising:

a first winding having a first edge adjacent to the air gap, the first edge having a first notch between two opposed ends of the first edge;

a second winding having a second edge adjacent to the air gap, the second edge having a second notch between two opposed ends of the second edge; and

a conduit electrically coupled directly to the first and second windings, wherein a majority of the conduit is situated in a recess at least partially defined by the first notch and the second notch.

69. The winding assembly of claim 68, wherein the recess is circumferentially extending.

70. The winding assembly of claim 69, wherein the recess extends around an entire circumference of the winding assembly.

71. The winding assembly of claim 68, wherein the recess is located radially outward of the inner region and radially inward of the outer region in the middle region.

72. The winding assembly of claim 68, wherein the conduit includes a height defined in the axial direction and a width defined in the radial direction, and wherein the recess is sized to accommodate the height and the width of the conduit, respectively.

73. The winding assembly of claim 72, wherein the recess includes a height defined in the axial direction and a width defined in the radial direction, and wherein the height and the width of the recess are substantially similar to the height and the width of the conduit, respectively.

74. The winding assembly of claim 68, wherein the conduit includes a rigid conduit.

75. The winding assembly of claim 68, wherein the conduit includes a main portion and first and second connector portions, wherein the first and second connector portions are electrically coupled directly to the first and second windings, respectively.

76. The winding assembly of claim 68, wherein at least a portion of the winding assembly is encapsulated in a potting compound.

77. The winding assembly of claim 68, wherein the electrical machine includes an electric motor.

78. A winding assembly for an axial air gap electrical machine having an axis, a rotor adapted to rotate about the axis, a stator, and an air gap between the rotor and the stator, the winding assembly having a first side adjacent to the air gap and a second side opposite the first side, the winding assembly comprising:

a first winding having a first edge adjacent to the air gap;

a second winding having a second edge adjacent to the air gap, the first and second edges defining a plane having a first surface facing the air gap and a second surface opposite the first surface;

a conduit electrically coupled directly to the first and second windings, wherein a majority of the conduit is situated axially adjacent to the first surface, and wherein the conduit has a height defined in the axial direction; and

a magnetically permeable element situated between the first and second windings, wherein at least a portion of the magnetic permeable element extends axially through the plane at least as far as the height of the electrical conduit.

79. The winding assembly of claim 78, wherein the magnetically permeable element includes an axially extending steel lamination.

80. The winding assembly of claim 78, wherein the magnetically permeable element includes at least a portion of a core of magnetically permeable material.

81. The winding assembly of claim 78, wherein the conduit includes a rigid conduit.

82. The winding assembly of claim 78, wherein the conduit includes a main portion, and first and second connector portions, wherein the first and second connector portions are coupled directly to the first and second windings, respectively, via at least one wave soldered connection.

83. The winding assembly of claim 78, wherein the electrical machine includes an electric motor.