ROTOR WITH MAGNET PATTERN

• US 20150229194A1
• Filed: 08/27/2013
• Published: 08/13/2015
• Est. Priority Date: 08/27/2012
• Status: Abandoned Application

• Current Assignee: Albust Technologies Limited
• Original Assignee: Albust Technologies Limited
• Inventors: Sromin, Alexander
• Application Number:
  US14/424,071
• Publication Number:
  US 20150229194A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02K 1/2798 where both axial sides of the stator face a rotor
• CPC Class Codes: H02K 1/32 with channels or ducts for flow of cooling medium
• CPC Class Codes: H02K 16/02 Machines with one stator and two or more rotors
• CPC Class Codes: H02K 21/24 with magnets axially facing the armatures, e.g. hub-type cycle dynamos
• 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

Abstract

Planar rotor designs for axial air-gap electric machines are presented. Some embodiments comprise rotors each of whose magnetic poles comprise a pair of permanent magnets each magnetized in an orientation of about 45° to the direction of the rotor axis. In some embodiments, axial components of the magnetization of each pair of magnets are co-directional, and tangential components of the magnetization of each pair of magnets are opposite.

Claims

1-5. -5. (canceled)

6. A rotor for an axial air-gap electric machine having a rotational axis, said rotor comprising alternating north and south magnetic poles, each of said north and south poles being generated by a pair of permanent magnets, wherein axial components of the magnetization of said paired magnets are co-directional, and tangential components of the magnetization of said paired magnets are opposite.

7. The rotor of claim 6, comprising first and second sets of magnet pairs, magnet pairs of said first set having tangential magnetization components directed towards each other, magnet pairs of said second set having tangential magnetization components directed away from each other, and wherein pairs of said first set alternate with pairs of said second set around said rotor.

9. The rotor of claim 6, wherein said pairs of magnets are magnetized with an orientation of between 30°

and 60°

to the rotational axis of the rotor.

11. The rotor of claim 6, wherein additional magnet elements having a tangential magnetization component are interposed between said south and north poles.

12. The rotor of claim 11, wherein said additional magnet elements are so oriented that their tangential magnetization component points away from a magnet pair generating a south pole and towards a magnet pair generating a north pole.

16. The rotor of claim 6 wherein at least some of said pairs of magnets are butt-jointed.

17. The rotor of claim 6, wherein at least some of said pairs of magnets are spaced away from adjacent pairs of magnets.

20. The rotor of claim 6, wherein at least some of said magnet pairs comprise permanent magnets which are spaced apart so that they do not touch each other.

23. The rotor of claim 6, further comprising a soft magnetic yoke.

24. The rotor of claim 23, wherein said yoke comprises ribs which separate each pair of magnets from adjacent pairs of magnets.

25. The rotor of claim 23, wherein said yoke comprises ribs which separate each permanent magnet from adjacent permanent magnets.

26. The rotor of claim 23, wherein said yoke comprise radial slot-like openings.

27. The rotor of claim 26, wherein at least some of said magnets have a face which is supported by said yoke and which is also least partially exposed to air through one of said openings.

28. The rotor of claim 6, wherein said magnets comprise a first layer, and the rotor further comprising a second layer adjacent to said first layer, said second layer comprising axially magnetized permanent magnets.

29. The rotor of claim 28, wherein each of said axially magnetized permanent magnets of said second layer has a magnetic orientation opposite that of the axially magnetized permanent magnets which are adjacent to it on said second layer.

30. The rotor of claim 28, wherein magnets of each of said pairs of magnets are butt-jointed to each other and to one of said axially magnetized magnet pieces.

31. An axial air-gap electric machine comprising the rotor of claim 6.

32. The machine of claim 31, comprising a rotor assembly which comprises two of said rotors spaced-apart, creating between them a flux which makes closure through adjacent pole sections of counter-directed axial magnetic flux.

33. The machine of claim 32, comprising a stator positioned between said rotors.

34. The machine of claim 32, further comprising at least one discoid rotor comprising axially magnetized permanent magnets forming a heteropolar magnetic system having a number of poles equal to the number of poles of each of said spaced-apart rotors.

8. (canceled)

10. (canceled)

13-15. -15. (canceled)

18-19. -19. (canceled)

21-22. -22. (canceled)

35-37. -37. (canceled)