ROTOR FOR AN ELECTRIC MACHINE

• US 20100019598A1
• Filed: 07/01/2009
• Published: 01/28/2010
• Est. Priority Date: 07/28/2008
• Status: Abandoned Application

• Current Assignee: Direct Drive Systems Inc. (TechnipFMC, plc)
• Original Assignee: Direct Drive Systems Inc. (TechnipFMC, plc)
• Inventors: Saban, Daniel M.
• Application Number:
  US12/496,552
• Publication Number:
  US 20100019598A1
• Time in Patent Office: Days
• US Class Current: 310/156.120
• CPC Class Codes: H02K 1/02 characterised by the magnetic material
• CPC Class Codes: H02K 1/165 Shape, form or location of the slots
• CPC Class Codes: H02K 1/278 Surface mounted magnets; Inset magnets
• CPC Class Codes: H02K 15/12 Impregnating, heating or drying of windings, stators, rotors or machines
• CPC Class Codes: H02K 3/12 arranged in slots
• CPC Class Codes: H02K 3/24 with channels or ducts for cooling medium between the conductors
• CPC Class Codes: H02K 3/28 Layout of windings or of connections between windings windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32
• CPC Class Codes: H02K 3/487 Slot-closing devices
• CPC Class Codes: H02K 3/50 Fastening of winding heads, equalising connectors, or connections thereto
• CPC Class Codes: H02K 5/1285 of the submersible type
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine
• CPC Class Codes: Y10T 29/49012 Rotor

Abstract

A multi-pole rotor for an electric machine including a rotor hub, a plurality of primary permanent magnet segments, each primary magnet segment having a rounded outer face and forming a section of a cylindrical outer surface of the rotor when mounted to the rotor hub. A plurality of interpole permanent magnet segments are also included, each interpole magnet segment having a rounded outer face and forming a section of a cylindrical outer surface of the rotor when mounted to the rotor hub. The primary magnet segments and interpole magnet segments defining two or more poles.

Claims

1. A multi-pole rotor for an electric machine comprising:

a rotor hub;

a plurality of primary permanent magnet segments around a perimeter of the rotor hub, an outer face of each primary magnet segment is substantially arcuate and defining a section of a substantially cylindrical surface of the rotor when mounted to the rotor hub, each primary permanent magnet segment is radially-magnetized to have a magnetic field with a magnetic direction vector normal to its outer face; and

a plurality of interpole permanent magnet segments around a perimeter of the rotor hub, an outer face of each interpole magnet segment is substantially arcuate and defining a section of a substantially cylindrical surface of the rotor when mounted to the rotor hub, each interpole permanent magnet segment having a magnetic field with a magnetic direction vector that is not normal to its outer face.

2. The rotor of claim 1, wherein the arcuate length of the primary and interpole permanent magnetic segments is uniform.

3. The rotor of claim 1, comprising at least as many interpole permanent magnet segments as poles in the rotor.

4. The rotor of claim 1, wherein the a total number of interpole permanent magnet segments is two and the primary permanent magnet segments and the interpole permanent magnet segments define two poles.

5. The rotor of claim 1, wherein a total number of interpole permanent magnet segments is four and the primary permanent magnet segments and the interpole permanent magnet segments define four poles.

6. The rotor of claim 1, wherein the primary permanent magnet segments and the interpole permanent magnet segments define multiple poles.

7. A two-pole rotor for an electric machine comprising:

a rotor hub; and

at least four permanent magnet segments residing around a perimeter of the rotor hub and defining a substantially cylindrical surface of the rotor,

at least four of the permanent magnet segments each having a magnetic direction vector with a different orientation relative to a radius of the cylindrical surface that bisects the magnetic segment.

8. The rotor of claim 7, wherein at least two magnet segments have magnetic direction vectors substantially normal to a surface of the rotor hub.

9. The rotor of claim 8, wherein the surface of the rotor hub is normal to a radius of the rotor.

10. The rotor of claim 8, wherein at least two magnetic direction vectors are substantially perpendicular to a radius of the rotor.

11. The rotor of claim 7, wherein an arcuate length of each of the permanent magnet segments is uniform.

12. The rotor of claim 7, wherein at least two of the permanent magnets are interpole magnets.

13. A rotor for an electric machine comprising:

a rotor hub;

a plurality of permanent magnet segments residing end to end around a perimeter of the rotor hub, an outer face of each permanent magnet segment being arcuate and the permanent magnet segments collectively defining a cylindrical surface of the rotor, each magnetic segment comprising a centerline, radial from a center of the cylindrical surface and bisecting the magnetic segment; and

the plurality of magnet segments defining a magnetic pole having a magnetic directional vector, radial from the center of the cylindrical surface and bisecting the magnetic pole, that is azimuthally offset from the centerline of each of the plurality of magnet segments.

14. The rotor of claim 13, wherein the magnetic directional vector is azimuthally offset from the ends of each of the plurality of magnet segments.

15. The rotor of claim 13, wherein the rotor is a two pole rotor.

16. The rotor of claim 13, wherein the rotor has more than two poles.

17. The rotor of claim 13, wherein at least two segments from the plurality of segments are interpole segments.

18. The rotor of claim 17, wherein the interpole segments are split interpole segments.

19. A rotor for an electric machine comprising:

a rotor hub having a central axis;

a plurality of permanent magnet segments residing around a perimeter of the rotor hub and forming a substantially cylindrical surface of the rotor, and

each of the magnetic segments having a magnetic directional vector substantially radial from the center of the cylindrical surface or at least one of substantially parallel to a tangent to the cylindrical surface or arcuate about a center of the rotor hub.

20. The rotor of claim 19, wherein segments having magnetic directional vectors parallel to a tangent to the cylindrical surface have the same arcuate length and segments having magnetic directional vectors radial from the center of the cylindrical surface have the same arcuate length.

21. The rotor of claim 19, wherein the arcuate length of segments having magnetic directional vectors radial from the center of the cylindrical surface is different than the arcuate length of segments having magnetic directional vectors parallel to a tangent to the cylindrical surface.