ROTOR FOR AN ELECTRIC MACHINE

• US 20100019599A1
• 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:
  US12/496,621
• Publication Number:
  US 20100019599A1
• 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 rotor for an electric machine can be constructed with magnet segments having a uniformly oriented direction vector component. In certain instances, a two-pole rotor includes a rotor hub and a plurality of permanent magnet segments affixed to a perimeter of the rotor hub. The magnetic segments defining a substantially cylindrical outer surface of the rotor. The magnet segments each have a magnetic field with a direction vector component, and the direction vector components of the magnet segments affixed to the perimeter of the rotor hub are substantially parallel and oriented in substantially the same direction.

Claims

1. A two-pole rotor for an electrical machine, comprising:

a rotor hub; and

a plurality of permanent magnet segments affixed to a perimeter of the rotor hub and defining a substantially cylindrical outer surface of the rotor, the magnet segments each have a magnetic field with a direction vector component, the direction vector components of the magnet segments affixed to the perimeter of the rotor hub are substantially parallel and oriented in substantially the same direction.

2. The rotor of claim 1, wherein the plurality of permanent magnet segments have substantially the same arcuate span.

3. The rotor of claim 1, wherein the orientation of the direction vector component of each magnet segment is uniform across the arcuate span the segment.

4. The rotor of claim 1, comprising four permanent magnet segments affixed to the perimeter of the rotor hub.

5. The rotor of claim 1, comprising sixteen permanent magnet segments affixed to the perimeter of the rotor hub.

6. The rotor of claim 1, wherein the magnet segments comprise a curved outwardly facing surface.

7. The rotor of claim 1, wherein the direction vector component of a first magnet segment is oriented in a first direction relative to its outward facing surface and the direction vector component of a second magnet segment is oriented in a second, different direction relative to the second magnet segment'"'"'s outward facing surface.

8. A method, comprising:

defining first and second magnetic poles, wherein;

each pole is defined by magnetic fields of permanent magnet segments in a plurality of magnet segments arranged to define a substantially cylindrical outer surface of a rotor of an electric machine, and

direction vector components of magnetic fields defining a pole are substantially parallel; and

rotating the magnetic field within a stator of an electric machine.

9. The method of claim 8, wherein the plurality of magnetic fields comprises four magnetic fields.

10. The method of claim 8, wherein the plurality of magnetic fields comprises sixteen magnetic fields.

11. The method of claim 8, wherein the plurality of magnetic fields are of substantially the same strength.

12. A four-pole rotor for an electrical machine, comprising:

a rotor hub;

a first plurality of permanent magnet segments affixed to the rotor hub and defining a first arc of a cylindrical outer surface of the rotor and a first magnetic pole of the rotor, each first magnet segment having a magnetic field with a direction vector component, the vector direction components of the first magnet segments affixed to the rotor hub being substantially parallel and oriented in substantially the same first direction;

a second plurality of permanent magnet segments affixed to the rotor hub and defining a second arc of a cylindrical outer surface of the rotor and a second magnetic pole of the rotor, each second magnet segment having a magnetic field with a direction vector component, the vector direction components of the second magnet segments affixed to the rotor hub being substantially parallel and oriented in substantially the same second direction;

a third plurality of permanent magnet segments affixed to the rotor hub and defining a third arc of a cylindrical outer surface of the rotor and a third magnetic pole of the rotor, each third magnet segment having a magnetic field with a direction vector component, the vector direction components of the third magnet segments affixed to the rotor hub being substantially parallel and oriented in substantially the same third direction; and

a fourth plurality of permanent magnet segments affixed to the rotor hub and defining a fourth arc of a cylindrical outer surface of the rotor and a fourth magnetic pole of the rotor, each fourth magnet segment having a magnetic field with a direction vector component, the vector direction components of the fourth magnet segments affixed to the rotor hub being substantially parallel and oriented in substantially the same fourth direction.

13. The rotor of claim 12 wherein the first direction is oriented opposite and substantially parallel to the third direction, and the second direction is oriented opposite and substantially parallel to the fourth direction.

14. The rotor of claim 13 wherein the first and third directions are oriented orthogonal to the second and fourth directions.

15. The rotor of claim 13 wherein the first arc is positioned diametric to the third arc, and the second arc is positioned diametric to the fourth arc.

16. The rotor of claim 12 wherein the first, second, third, and fourth pluralities of segments comprise equal numbers of segments.

17. The rotor of claim 12 wherein the segments of the first, second, third, and fourth pluralities of segments are of substantially uniform arcuate span.

18. The rotor of claim 12 wherein the first, second, third, and fourth pluralities of segments cooperate to define a cylindrical outer surface of the rotor.

19. A method, comprising:

defining a first magnetic pole with a first plurality of magnetic fields having direction vector components that are substantially parallel, the first plurality of magnetic fields produced by a first plurality of permanent magnets arranged to define a first quadrant of a substantially cylindrical surface;

defining a second magnetic pole with a second plurality of magnetic fields having direction vector components that are substantially parallel, the second plurality of magnetic fields produced by a second plurality of permanent magnets arranged to define a second quadrant of a substantially cylindrical surface;

defining a third magnetic pole with a third plurality of magnetic fields having direction vector components that are substantially parallel, the third plurality of magnetic fields produced by a third plurality of permanent magnets arranged to define a third quadrant of a substantially cylindrical surface;

defining a fourth magnetic pole with a fourth plurality of magnetic fields having direction vector components that are substantially parallel, the fourth plurality of magnetic fields produced by a fourth plurality of permanent magnets arranged to define a fourth quadrant of a substantially cylindrical surface; and

rotating the magnetic poles in a stator of an electric machine.

20. The method of claim 19, wherein the total number of magnetic fields comprises sixteen magnetic fields.

21. The method of claim 19, wherein the plurality of magnetic fields are substantially the same strength.

22. The method of claim 19, wherein the first plurality of magnetic fields is oriented in a different direction than the second plurality of magnetic fields.