Magnetic coils for electrical machines

• US 20050073208A1
• Filed: 08/19/2004
• Published: 04/07/2005
• Est. Priority Date: 03/21/2002
• Status: Active Grant

• Current Assignee: Rolls-Royce PLC (Rolls-Royce Holdings Plc)
• Original Assignee: Rolls-Royce PLC (Rolls-Royce Holdings Plc)
• Inventors: Mitcham, Alan J.
• Granted Patent: US 7,265,472 B2
• Time in Patent Office: Days
• US Class Current: 310/184
• CPC Class Codes: H02K 3/14 with transposed conductors, e.g. twisted conductors
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine
• CPC Class Codes: Y10T 29/49071 by winding or coiling

Abstract

A magnetic coil 32 for an electrical machine is constructed from two sub-conductors 34A,34B, each in the form of laminae of conducting material such as copper sheet, coated with an insulating material. At one end of the coil, the sub-conductors extend by different distances, to provide space at 39 for a transposition of the sub-conductors.

Claims

1. A magnetic coil for an electrical machine which includes an armature having slots for receiving a magnetic coil, the coil having turns provided by at least two sub-conductors, each sub-conductor having slot portions which, in use, are located within the armature slots of an electrical machine, and connecting portions which, in use, are located outside the armature slots to provide connections between the slot portions at the ends of the coil, the connecting portions of at least one end of the coil extending by different distances from the slot portions to provide space for a connecting portion of one sub-conductor to extend past a connecting portion of another sub-conductor in order to change the order of the sub-conductors along the coil.

2. A coil according to claim 1, wherein the connecting portions are arranged to provide transportation of the order of sub-conductors.

3. A coil according to claim 1, wherein the connecting portions are arranged as aforesaid at both ends of the coil, to provide for changing the order of sub-conductors at both ends.

4. A coil according to claim 1, wherein each sub-conductor is in the form of a complete sub-conductor coil having slot portions connected at both ends by connecting portions, the turns of each sub-conductor coil being brought together with the turns interleaved.

5. A coil according to claim 1, wherein the magnetic coil consists of two sub-conductors.

6. A coil according to claim 1, wherein the slot portions of the coil are formed to have parallel faces defined by the slot portions, to allow the coil to be located within a pair of parallel sided slots formed within an armature.

17. A coil according to claim 1, wherein the magnetic coil consists of two sub-conductors.

18. A coil according to claim 1, wherein the slot portions of the coil are formed to have parallel faces defined by the slot portions, to allow the coil to be located within a pair of parallel sided slots formed within an armature.

7. An electrical machine which includes an armature having slots for receiving a magnetic coil, and at least one magnetic coil located in the slots and having turns provided by at least two sub-conductors, each sub-conductor having slot portions which are located within the armature slots, and connecting portions which, in use, are located outside the armature slots to provide connections between the slot portions at the ends of the coil, the connecting portions of at least one end of the coil extending by different distances from the slot portions to provide space for a connecting portion of one sub-conductor to extend past a connecting portion of another sub-conductor in order to change the order of the sub-conductors along the coil.

8. An electrical machine according to claim 7, wherein each magnetic coil of the machine is a coil.

9. A machine according to claim 7, wherein each magnetic coil is located in a pair of armature slots, the slot walls of the pair of slots being substantially parallel.

10. A machine according to claim 9, wherein the sub-conductors fill the armature slots substantially without gaps between sub-conductors or between turns of the coil.

14. A coil according to claim 8, wherein the connecting portions are arranged to provide transportation of the order of sub-conductors.

15. A coil according to claim 8, wherein the connecting portions are arranged as aforesaid at both ends of the coil, to provide for changing the order of sub-conductors at both ends.

16. A coil according to claim 8, wherein each sub-conductor is in the form of a complete sub-conductor coil having slot portions connected at both ends by connecting portions, the turns of each sub-conductor coil being brought together with the turns interleaved.

11-13. -13. canceled